Building Regulations - Part L (2002 Edition) User Guide

Transcription

1 Building Regulations - Part L (2002 Edition) User Guide IES Virtual Environment Last update: Version 5.9 Copyright 2014 Integrated Environmental Solutions Limited. All rights reserved. No part of the manual is to be copied or reproduced in any form without the express agreement of Integrated Environmental Solutions Limited.

2 Contents 1. Introduction What is Part L (2002)? Part L (England & Wales) and Section 6 (Scotland) Overview of Part L L1 dwellings L2 buildings other than dwellings Methods and Requirements Methods and Requirements in L Methods and Requirements in L Overview of Part L interface features Part L building and system data General Data common to Part L1 and Part L Building Data for Part L Heating System SAP 2. Ventilation rate SAP 4 & 10. Water heating SAP 5. Internal gains SAP 9 & 10. Space-heating SAP 9* & 10*. Space-heating (community heating) Data for Part L Elemental Heating Systems Office CPR Nat Vent Office CPR Mech Vent Office CPR Air Cond Database OK Cancel Building Regulations Room Data General Building Regulations Room Data Building Regulations Construction Data Glazing Doors Part L Analysis and Results Part L (2002) England/Wales/NI Analysis Results VE 5.9 UK Building Regulations Part L

3 Acknowledgements Extracts from the following documents are reproduced with permission: DTLR. The Building Regulations Conservation of fuel and power. Approved Document L2 Conservation of fuel and power in buildings other than dwellings Edition. The Stationery Office. Crown copyright Free download available at BRE Digest 457. The Carbon Performance Rating for Offices. P F Grigg. Published by CRC Ltd, 151 Rosebery Avenue, London, EC1R 4GB. Tel: Fax: enquiries@bre.co.uk BRE, DEFRA, DTLR. The Government s Standard Assessment Procedure for Energy Rating of Dwellings, 2001 Edition (SAP 2001). VE2014 UK Building Regulations Part L

4 1. Introduction 1.1. What is Part L (2002)? Part L (2002) is a facility within the Virtual Environment s <VE> Compliance view providing facilities for testing compliance with Part L of the Building Regulations (2002 edition). Part L (2002) applies to buildings in England, Wales and Northern Ireland for which construction started before 6 th April If construction had not started before that date, the 2006 edition of Part L applies. Virtual Environment Thermal category <VE> Compliance view Part L (2002) The Part L (2002) facility covers Part L1 (dwellings) and Part L2 (buildings other than dwellings). Data for the Part L (2002) analysis is taken from the <Virtual Environment> model, supplemented where necessary by inputs specific to the requirements of Part L (2002). Results of the Part L (2002) analysis are presented in three levels of detail: Pass/fail verdicts for the methods tested. A summary of the checks carried out within each method and their results (an HTML file). A report setting out the analysis in detail (an HTML file). Certain analysis results are processed and displayed immediately data is entered, providing instant feedback to the user Part L (England & Wales) and Section 6 (Scotland) The software covers both Part L (England & Wales) and Section 6 (Scotland). To switch between Part L and Section 6, click on Regulatory framework on the <VE> Compliance toolbar. There is considerable overlap between the Part L and Section 6 regulations, and data is shared between these software applications. Important differences are: VE2014 UK Building Regulations Part L

5 For dwellings In Part L, the Elemental method may only be applied where the heating system is based on an efficient gas or oil boiler, on a heat pump, on community heating with CHP or on biogas or biomass fuel. In Section 6, the Elemental method may be applied regardless of the type of heating system, but with modified U-value requirements in some cases. Section 6 Elemental U-values tend to be more stringent than those in Part L. Part L and Section 6 use different formulae for target U-value. Unlike its Part L counterpart, the Section 6 Target U-value method does not allow the target U-value to be relaxed if the heating system efficiency exceeds the Mininum SEDBUK. Section 6 Elemental and Target U-value methods allow some concessions for conservatories. For buildings other than dwellings Section 6 elemental U-values are more stringent for external walls and display glazing. For methods other than the elemental method, the poorest (maximum) U-value for roofs is less stringent in Section 6 than in Part L. Section 6 has no requirement to avoid solar overheating. Section 6 has different carbon intensity targets for heating systems and allows no trade-off between heating system carbon intensity and fabric losses. Section 6 imposes a more stringent specific fan power requirement on non-office buildings. Section 6 assesses office systems using a Carbon Performance Index. Part L uses the closely related Carbon Performance Rating. Process loads are excluded from the assessment in Part L but not in Section 6. Section 6 has no counterpart of the L2 Whole-Building Method. Guidance on using the Section 6 software is provided in the Section 6 (2004) User Guide Overview of Part L The requirements of The Building Regulations, Part L (2002 edition) are set out in Approved Documents L1 [1] and L2 [2]. These documents should be consulted in the course of any submission for Part L compliance. The function and scope of the approved documents is set out in the Use of guidance section: Approved Documents are intended to provide guidance for some of the more common building situations. However, there may well be alternative ways of achieving compliance with the requirements. Thus there is no obligation to adopt any particular solution contained in an Approved Document if you prefer to meet the relevant requirement in some other way. VE2014 UK Building Regulations Part L

6 Guidance on the Part L regulations is provided on BRE and ODPM websites [9,10,11,12]. Guidance on the Part L2 Carbon Emissions Calculation Method is provided in the CIBSE/ODPM publication TM32 [13]. Not all the requirements of Part L can be tested in software. However, IES aims to provide software covering all requirements that can be so tested L1 dwellings The broad requirements of L1 are set out in Section 0: General of Approved Document L1 [1] referred to in this document as ADL1. They cover: L1 (a) Limiting fabric heat loss, summertime heat gains and heat losses by air infiltration L1 (b) Limiting heat loss from pipes and ducts L1 (c) Efficiency of heating systems L1 (d) Efficiency of lighting systems L1 (e) Providing information on the operation and maintenance of building services systems. Section 1 of the Approved Document sets out three methods that can be used for demonstrating that reasonable provision has been made for limiting heat loss through the fabric. These are: a) an Elemental Method (paragraphs ). The Elemental Method can be used only when the heating system will be based on an efficient gas or oil boiler, on a heat pump, on community heating with CHP or on biogas or biomass fuel, but not for direct electric heating or other systems. It is suitable for alterations and extension work, and for newbuild work when it is desired to minimise calculations. The main requirements of the Elemental Method are i) limits on U-values, ii) stipulations on the type and efficiency of the heating system and iii) limits on the area of windows, doors and rooflights. b) a Target U-value Method (paragraphs ). Within certain limits, this method allows greater flexibility than the Elemental Method in selecting the areas of windows, doors and rooflights, and the insulation levels of individual elements in the building envelope, taking into account the efficiency of the heating system and enabling solar gain to be addressed. It can be used for any heating system. The Target U-value Method requires that the average U-value of the dwelling does not exceed a Target U-value, corrected for the proposed method of heating. c) a Carbon Index Method (paragraphs ). The aim of this method is to provide more flexibility in the design of new dwellings whilst achieving similar overall performance to that obtained by following the Elemental Method. The Carbon Index is defined in the Standard Assessment Procedure for Energy Rating of Dwellings [8] (SAP), and the requirement is met if the Carbon Index for the dwelling is not less than 8.0. VE2014 UK Building Regulations Part L

7 Compliance methods for L1 Elemental Method L1 Target U-value Method Carbon Index Method In addition, ADL1 lays down requirements covering: Poorest acceptable U-values Limiting thermal bridging at junctions and around openings Limiting air leakage Space heating system controls Hot water systems Commissioning of heating and HWS systems Operating and maintenance instructions for heating and hot water systems L2 buildings other than dwellings The broad requirements of L2 are set out in Section 0: General guidance of Approved Document L2 [2] referred to in this document as ADL2. They cover: L2 (a) Limiting fabric heat loss, summertime heat gains and heat losses by air infiltration L2 (b) Limiting heat loss from pipes and ducts L2 (c) Efficiency of heating systems L2 (d) Limiting solar heat gains and their effects L2 (e) Efficiency of mechanical ventilation and air-conditioning systems L2 (f) Limiting heat gains to pipes and ducts used in air-conditioning. L2 (g) Efficiency of lighting systems L2 (h) Providing information on the operation and maintenance of building services systems. Section 1 of the Approved Document sets out three methods that can be used for demonstrating that reasonable provision has been made for the conservation of fuel and power. These are: VE2014 UK Building Regulations Part L

8 a) an Elemental Method (paragraphs ). This method considers the performance of each aspect of the building individually. To comply with the provisions of Part L, a minimum level of performance should be achieved in each of the elements. Some flexibility is provided for trading off between different elements of the construction, and between insulation standards and heating system performance. b) a Whole-Building method (paragraphs ). This method considers the performance of the whole building. For office buildings, the heating, ventilation, air conditioning and lighting systems should be capable of being operated such that they will emit no more carbon per square metre per annum than a benchmark based on the ECON 19 data [4]. Alternative methods are also provided for schools and hospitals. c) a Carbon Emissions Calculation Method (paragraphs ). This method also considers the performance of the whole building, but can be applied to any building type. To comply with the provisions of Part L, the annual carbon emissions from the building should be no greater than that from a notional building that meets the compliance criteria of the Elemental Method. The carbon emissions from the proposed building and the notional building need to be estimated using an appropriate calculation tool. Compliance methods for L2 Elemental Method L2 Whole-building Method Carbon Emissions Calculation Method 1.4. Methods and Requirements The compliance routes available in Part L can conveniently be set out in terms of Methods and Requirements. For example, L2 offers three methods of compliance: the L2 Elemental Method, the L2 Whole-building Method and the L2 Carbon Emissions Calculation Method. Within each method a number of requirements are laid down. In some cases compliance with a requirement may be demonstrated by more than one method. Each method specifies certain requirements, which in turn may be complied with by various methods, and so on. VE2014 UK Building Regulations Part L

9 1.5. Methods and Requirements in L1 L1 offers three methods for demonstrating compliance with the requirements on fabric and heating system performance: Elemental Method, Target U-value Method and Carbon Index Method. It also it sets out additional requirements under the heading of additional checks by builders relating to issues such as air leakage, controls, hot water systems and the provision of information. The IES software places these additional requirements under the headings of the three main compliance routes. The L1 compliance routes can be summarised as follows. The numbering system used here is that used in the IES <Virtual Environment> implementation. Paragraph numbers refer to Approved Document L1 [1]. L1 Elemental Method L1 Elemental Method (L1E) (paragraphs ) L1E 1. Heating Efficiency Requirement (paragraph 1.7) L1E 2. U-value (Table 1) Requirement (paragraphs ) L1E 3. Glazing & Door Area Requirement (paragraphs ) L1E 4. Additional Requirements (paragraphs ) L1 Target U-value Method L1 Target U-value Method (L1T) (paragraphs ) L1T 1. Mean U-value Requirement (paragraphs ) L1T 2. Maximum U-value (Table 3) Requirement (paragraph 1.29) L1T 3. Additional Requirements (paragraphs ) L1 Carbon Index Method L1 Carbon Index Method (L1C) (paragraph 1.27) L1C 1. Carbon Index Requirement (paragraph 1.27) L1C 2. Maximum U-value (Table 3) Requirement (paragraph 1.29) L1C 3. Additional Requirements (paragraphs ) 1.6. Methods and Requirements in L2 L2 offers three methods for demonstrating compliance with the requirements on fabric and heating system performance: Elemental Method, Whole-building Method and Carbon Emissions Calculation Method. L2 Elemental Method The requirements laid down by the L2 Elemental Method, together with their constituent methods, are as follows. The numbering system used here is that used in the IES <Virtual Environment> implementation. Paragraph numbers refer to Approved Document L2 [2]. L2 Elemental Method (L2E) (paragraphs ) L2E 1. Fabric Requirement (paragraphs ) L2E 1.1 Pure Elemental Method (paragraph 1.8) VE2014 UK Building Regulations Part L

10 L2E U-value (Table 1) Requirement (paragraphs 1.8,1.12) L2E Heating Systems Adjustment Factor Requirement (paragraphs 1.14,1.32) L2E Maximum Window/Door/Rooflight Area (Table 2) Requirement (paragraph 1.12) L2E 1.2 Construction Trade-off Method (paragraphs & 1.32) L2E Overall Building Heat Loss Requirement (paragraphs 1.15a & 1.32) L2E Maximum Traded-off U-value (Table 3) Requirement (paragraph 1.15b) L2E Average Traded-off U-value Requirement (paragraph 1.16b) L2E 2. Thermal Bridging and Air Leakage Requirements (paragraphs & ) L2E 3. Solar Overheating Avoidance Requirement (paragraphs ) L2E 3.1 Glazing Area Limitation (Table 4) Method (paragraph 1.22) L2E 3.2 Solar Load Estimation (Appendix H) Method (paragraph 1.23a) L2E 3.3 Detailed Overheating Calculation Method (paragraph 1.23b) L2E 4. Heating Systems Requirements (paragraphs ) L2E 4.1 Heating Systems Carbon Intensity Requirement (paragraphs ) L2E 4.2 Heating Controls Requirements (paragraphs ) L2E 4.3 Insulation of Pipes, Ducts & Vessels Requirement (paragraphs ) L2E 5. Lighting Systems Requirements (paragraphs ) L2E 6. Air-conditioning and Mechanical Ventilation (ACMV) Requirement (paragraphs ) L2E 6.1 Office CPR Method (paragraphs & Appendix G) L2E 6.1(MV) Office CPR Mechanical Ventilation Requirement (paras & App. G) L2E 6.1(AC) Office CPR Air-Conditioning Requirement (paragraphs & App. G) The <Virtual Environment> implementation includes analysis of all these requirements and methods with the exception of: Thermal Bridging and Air Leakage Requirements (cannot be analysed in software) Detailed Overheating Calculation (CIBSE) Method (to be added) Heating Controls Requirements (cannot be analysed in software) Insulation of Pipes, Ducts & Vessels Requirements (cannot be analysed in software) Lighting Systems Requirement (to be added) L2 Whole-building Method The requirements laid down by the L2 Whole-building Method, together with their constituent methods, are set out below. Paragraph numbers refer to Approved Document L2. The application of the Whole-building Method to offices, schools and hospitals is based on procedures described in other documents, as indicated. L2 Whole-building (Office) Method (L2WO) (paragraphs ) L2WO 1. Whole-office CPR Requirement (paragraphs ) L2WO 1.1 Naturally Ventilated Areas CPR Requirement (BRE Digest 457 [3] ) L2WO 1.2 Mechanically Ventilated Areas CPR Requirement (BRE Digest 457 [3] ) VE2014 UK Building Regulations Part L

11 L2WO 1.3 Air-conditioned Areas CPR Requirement (BRE Digest 457 [3] ) L2WO 2. Maximum U-value (Table 3) Requirement (paragraph 1.71b) L2WO 3. Thermal Bridging and Air Leakage Requirements (paragraphs 1.71b, & ) L2 Whole-building (School) Method (paragraph 1.72) L2WS 1. DfEE guidance note [5] Requirement L2 Whole-building (Hospital) Method (paragraph 1.73) L2WH 1. NHS Estates guide [6] Requirement The <Virtual Environment> implementation does not currently cover: The application of the Whole-building method to schools and hospitals Thermal Bridging and Air Leakage Requirements (cannot be analysed in software) L2 Carbon Emissions Method The requirements laid down by the L2 Carbon Emissions Method are set out below. Paragraph numbers refer to Approved Document L2. L2 Carbon Emissions Method (L2C) (paragraphs ) L2C 1. Carbon Emissions Requirement (paragraphs ) L2C 2. Maximum U-value (Table 3) Requirement (paragraph 1.75b) L2C 3. Thermal Bridging and Air Leakage Requirements (paragraphs 1.75b, & ) The Carbon Emissions Requirement (paragraph 1.74) states To show compliance using the Carbon Emissions Calculation Method, the calculated annual carbon emissions of the proposed building should be no greater than those from a notional building of the same size and shape, designed to comply with the Elemental Method. This approach allows more flexible design of the building, taking advantage of any valid energy conservation measure and taking account of useful solar and internal heat gains. The <Virtual Environment> offers tools for calculating carbon emissions based on simulated performance of the actual and notional buildings over a typical year. Carbon emissions calculations are not performed automatically by the Part L facility. Additional L2 Requirements Approved Document L2 lays down the following requirements in addition to those that can be tested by the three methods described above: Construction requirements on the methods used to construct the building Providing information requirements to provide the owner and/or occupier of the building with information about the building and its systems. The information should include, for systems serving an office area of more than 200 m 2, a design assessment of the building services systems carbon emissions and the comparable performance benchmark. In the case of the Whole-building (Office) Method, this information is provided in the <Virtual Environment> Part L results file. In the case of the Carbon Emissions Method, it would be provided by the results of the carbon emissions calculation. VE2014 UK Building Regulations Part L

12 1.7. Overview of Part L interface features The interface features in the Part L software are as follows. Part L building and system data This part of the interface deals with Part L data at the building or system level (for instance, whether the building is an office or a school, the characteristics of its heating system, etc). It can be accessed either via the Building Regulations option on the Apache view Settings menu or via the Part L analysis facility. Part L building and system data may be stored in a database for future reuse. Building regulations room data Data specific to the building regulations relating to individual rooms (for instance, whether the room is heated) is entered via the Building Regulations tab of Room Data, or via the Apache view Settings menu. Building regulations construction data Building regulations data relating to constructions (for instance, whether a window is classified as display glazing) is entered via fields labelled Building Regulations within the construction data dialogues in APcdb. Data not required for Part L For testing Part L2 compliance using the Elemental and Whole-building Methods it is not necessary to enter Building location or weather data Room data other than that appearing on the Part L tab Profile data MacroFlo data ApacheHVAC data However, the Carbon Emissions Method does require data in some or all of these categories to be entered as input to simulations of the proposed and notional buildings. Part L analysis and results The Part L analysis and results dialogue, accessed via a dialogue on the lower edge of the <VE> Compliance view, is divided into two parts: Part L (2002) England/Wales/NI: facilities for specifying the Part L analysis to be performed Results: facilities for viewing the results of the analysis This dialogue also provides a route to the Part L building and system data. VE2014 UK Building Regulations Part L

13 2. Part L building and system data 2.1. General This part of the interface deals with Part L data relating to the building type and the building s environmental systems. It is divided into tabs covering different aspects of this data. Part L building and system settings may be stored in a user database. Part L building and system data is accessed by two routes: 1. via the <VE> Compliance menu option Settings/Building Regs Building & System Data 2. via the Part L analysis dialogue at the lower edge of the <VE> Compliance screen. Part L1 and Part L2 require different types of building and system data. The data tabs and fields required to be filled in change depending on the Building Type selected. Within Part L1 or Part L2, not all data fields are required by all methods. For example, while the bulk of the Part L2 building and system data is used by the L2 Elemental Method, some fields are required only by the Whole-building (Office) method and can be ignored for the purpose of the Elemental Method. The detailed documentation below indicates which items of data are required for each method Data common to Part L1 and Part L Building This tab deals with Part L data at the building level (as distinct from data describing individual rooms or constructions). Building Type Part L distinguishes between various building types. The choices are: Dwelling requires analysis by Part L1 Dwelling extension a category within Part L1 (not currently supported) Residential building a category within Part L2 (ADL2 Table 2) Office a category within Part L2 (ADL2 Table 2, paragraph 1.62 (CPR Method) & paragraph Whole-building Method) Place of assembly or shop a category within Part L2 (ADL2 Table 2). Industrial or storage building a category within Part L2 (ADL2 Table 2) School a category within Part L2 (ADL2 paragraph Whole-building Method) Hospital a category within Part L2 (ADL2 paragraph Whole-building Method) Other not eligible for Part L2 Whole-building Method (ADL2 paragraph 1.70) VE2014 UK Building Regulations Part L

14 New or existing Indicate whether the building is new or existing. An existing building may have a less stringent CPR target for air-conditioning and mechanical ventilation in the L2 Elemental Method. Where alterations are made to the fabric of existing buildings, existing elements that are not subject to alteration may not need to comply with the standards of the current regulations. However, the software currently applies the same checks to all elements Data for Part L Heating System This tab contains data describing the dwelling s heating system. This data is used by all three L1 methods, with the exception of data fields appearing in green, which are used only by the Carbon Index (SAP) Method. All other Part L1 tabs are used exclusively by the Carbon Index Method. This tab provides access to the Boiler Efficiency Database maintained by DEFRA. This database is updated on the first day of each month and the latest version may be downloaded from The database file, bedf.dat, should be placed in the folder IES\apps\Regs. Heating system (L1 Elemental Method and SAP Table 4a) The type of system providing space-heating in the dwelling. The options (underlined) are the system types appearing in SAP [8] Table 4a. Depending on the heating system selected, further data fields are presented, as shown below beneath each option: CENTRAL HEATING SYSTEM WITH RADIATORS OR UNDERFLOOR HEATING Heating system type Select a central heating system type: Gas or oil boiler Click on a radio button to indicate the source of the boiler efficiency data: Use SAP Table 4b to take efficiency and other data from this table Boiler type (2 fields) select options to describe the gas/oil boiler for SAP Table 4b Boiler type (2 fields) select options to describe the gas/oil boiler for SAP Table 4b Enter manufacturer s efficiency? tick this box to override the SAP Table 4b efficiency Select from boiler database to take efficiency and other data from the boiler database Select from database accesses the boiler database allowing you to select a boiler Detail displays the detailed parameters for the selected boiler Efficiency adjustments (SAP Table 4c) due to... These options are used to calculate the Adjusted Efficiency (SAP Table 4c). Low temperature distribution system select an option for SAP Table 4c Control system select an option for SAP Table 4c Heat emitter (SAP Table 4d) select a type of heat emitter for SAP Table 4d VE2014 UK Building Regulations Part L

15 Solid fuel boiler Solid fuel boiler type select an option to describe the boiler for SAP Table 4a Electric Boiler Electric boiler type select an option to describe the boiler for SAP Table 4a Electric CPSU data (SAP Appendix F) specify CPSU parameters where applicable for use in SAP Appendix F: CPSU cylinder size (litres) CPSU operating temperature (winter) Heat Pumps Heat pump type select an option to describe the heat pump for SAP Table 4a COMMUNITY HEATING SCHEME Heating scheme type Select a community heating scheme type (determines the method used for the Carbon Index calculation): CHP (includes instances where some heat is supplied from community boilers). Recovered heat from power station (includes instances where some heat is supplied from community boilers) treated differently from CHP in Carbon Index calculation. Community boilers (without any CHP or recovered heat component) treated with a dedicated section of the SAP worksheet. With this option the parameter Fraction of heat from CHP or fraction of heat recovered from power station on the SAP 9* & 10* Spaceheating (community heating) tab should be set to 0. STORAGE RADIATOR SYSTEM Tariff select Off-peak or 24-hour tariff for SAP Table 4a Heater type select a type of storage heater for SAP Table 4a WARM-AIR SYSTEM Air heating system select a type of warm-air system for SAP Table 4a Heater type select a heater type for SAP Table 4a ROOM HEATER SYSTEM Room heater system type select a type of room heater system for SAP Table 4a Heater type select a room heater type for SAP Table 4a OTHER SPACE-HEATING SYSTEM Heating system type only one option, Electric ceiling heating, is permitted in Table 4a UNDECIDED If the type of heating system is undecided the Target U-value Method applies a factor to make the U-value requirement more demanding (ADL1 paragraph 1.21). This option is not permitted with the Elemental Method or the Carbon Index Method. Space heating fuel Select a fuel or electricity tariff to be used in SAP Table 12 or, in the case of heat pumps, SAP Appendix G. The fuel must be consistent with the space heating system. For community heating, this parameter is ignored: community heating fuels are specified on the SAP 9* & 10* Space-heating (community heating) tab. VE2014 UK Building Regulations Part L

16 Biomass or biogas fuel? Tick this box if the heating system is fuelled by biomass or biogas. Such systems are unconditionally eligible for the Elemental Method. Efficiency Displays the efficiency of the heating system, unadjusted for distribution system and controls. If you have ticked the box Enter manufacturer s efficiency? you should enter the manufacturer s efficiency here. Heating type Displays the Heating type parameter of the heating system obtained from SAP Table 4a and used in the SAP Table 8 to obtain the (unadjusted) mean internal temperature of the living area. Responsiveness Displays the Responsiveness parameter, R, of the heating system obtained from SAP Table 4a and used in the SAP worksheet (box 72) to adjust the mean internal temperature of the living area. SEDBUK? Indicates whether the system efficiency qualifies as a SEDBUK value. If you have ticked the box Enter manufacturer s efficiency? you should also indicate whether the entered efficiency is a SEDBUK value, which it must be if the Elemental Method is to be applied. Source of efficiency data Indicates the source of the efficiency data (Boiler database, SAP Table 4b, Manufacturer or N/A). Non-editable. Adjusted efficiency Displays the efficiency of the heating system, adjusted for distribution system and controls as indicated in SAP Table 4c. Heating system controls Select the heating system control type for SAP Table 4e. This will affect the Control parameter used in SAP Table 9 (difference in temperatures between zones) and the room temperature adjustment entered in SAP box SAP 2. Ventilation rate This tab and all the following tabs contain data used exclusively by the Carbon Index Method. The boxes on this tab correspond closely to those in Section 2 (Ventilation rate) of the SAP worksheet (boxes 7-25),. For guidance, see Section 2 of SAP VE2014 UK Building Regulations Part L

17 Number of chimneys Number of flues Number of fans and passive vents Ventilation rate for flueless gas fire (m 3 /hour) add 40 m 3 /s for each flueless gas fire if present Has a pressurisation test been done? If yes, L50 If no, Number of storeys Construction type Floor type Is there a draught lobby? Percentage of windows & doors draughtstripped Number of sides on which sheltered Ventilation type Select Natural, Mechanical with heat recovery or Mechanical without heat recovery SAP 4 & 10. Water heating The boxes on this tab relate to those in Section 4 (Water-heating energy requirements, boxes 39-52), and Section 10 (Fuel costs, boxes, and 89*- 100*) of the SAP worksheet. For guidance, see Sections 4 and 10 of SAP Water heating system (SAP Table 4a) Indicate the system used to provide hot water. The options (with the exception of the first) are those appearing in SAP Table 4a under HOT-WATER-ONLY HEATING SYSTEMS, with Independent electric water heating system expanded into Immersion heater (single) and Immersion heater (dual) to provide the input data required for SAP Table 13 or (in the case of heat pumps) SAP Appendix G: Provided by space heating system (but not heat pumps) Select this option if hot water is supplied by the space heating system, except in the case where space heating is provided by heat pumps. Immersion heater (single) Select this option or the following if space heating is provided by heat pumps. Immersion heater (dual) From a heat exchanger built into a gas warm-air system Single-point gas water heater Multi-point gas water heater Water heating fuel Select a fuel or electricity tariff to be used in SAP Table 12 or, in the case of heat pumps, SAP Appendix G. The fuel must be consistent with the water heating system. VE2014 UK Building Regulations Part L

18 Is water heated by community heating? This option is set automatically. If the heating system is set to COMMUNITY HEATING SCHEME and Water heating system (SAP Table 4a) is set to Provided by space heating system (but not heat pumps), the box is ticked, with consequences for the calculations done in Section 4 of the SAP form. Is there a hot water tank or other storage device? If so, the following data must be entered to provide the data for boxes of the SAP form: Hot water storage volume (litres) Hot water storage type (SAP Table 2) data required by SAP Table 2 and its footnotes Is there a cylinder thermostat (SAP Table 2)? Insulation thickness (mm) (SAP Table 2) Area of solar panel (0 if none) (m 2 ) Enter the area of any solar panel used for water heating. Primary circuit and keep-hot losses (SAP Tables 3 & 4f) Water heating system type Pick an appropriate category for SAP Table 3. If space heating is provided by heat pumps, the appropriate setting is Electric immersion heater. Combi boiler? For a combination boiler, enter the following data used in the section of SAP Table 3 labelled Additional losses for combi boilers, an in the section of SAP Table 4f labelled Electricity for maintaining keep-hot facility of a gas combi boiler : Keep-hot facility type Controlled by time clock? Electric power rating (W) (0 if unknown) SAP 5. Internal gains The boxes on this tab relate to box 53a of Section 5 of the SAP worksheet: Additional gains from Table 5. For guidance, see Section 5 of SAP Central heating pump? Tick if there is a central heating pump (does not apply to community heating) Warm-air heating system fans? Tick if there are warm-air heating system fans (does not apply to community heating) Mechanical ventilation system Tick if there is a mechanical ventilation system (do not include if either of the two preceding boxes is ticked) Oil pump, inside dwelling Tick if there is an oil pump inside the dwelling and therefore contributing to heat gains VE2014 UK Building Regulations Part L

19 SAP 9 & 10. Space-heating The boxes on this tab relate to Section 9 (Space-heating requirement, SAP boxes 81-87) and Section 10 (Fuel costs, SAP boxes ) of the SAP worksheet, which apply if space and water heating is not provided by community heating. For guidance, see Sections 9 and 10 of SAP Heat from secondary system (Table 11 & Appendix F) The following provide the data for SAP Table 11 (Fraction of heat supplied by secondary heating system), SAP Table 4a (secondary system efficiency for SAP box 84) and the calculation of fuel costs in Section 10 of the SAP form. In the case of electric CPSUs, SAP Appendix F is used in place of Table 11. Main system This field, which is used as input to SAP Table 11 (for SAP box 82) is set automatically from data entered on the Heating System tab, as follows: When Heating system is CENTRAL HEATING... or WARM-AIR SYSTEM, Main system is set to Boiler, except where Heating system type is Heat pumps, when the setting is Heat pump. When Heating system is STORAGE RADIATOR SYSTEM, Main system is set to Fan assisted storage heaters or Electric storage heaters not fan assisted, depending on the Heater type. When Heating system is ROOM HEATER SYSTEM, the Main system setting depends on Room heater system type and Heater type. When Room heater system type is Gas, the setting is Gas room heaters. When Room heater system type is Solid Fuel, and Heater type is any of the options beginning Open fire..., the setting is Coal fires or other electric systems. In all other cases the setting is Coal or electric room heater. When Heating system is OTHER SPACE-HEATING SYSTEMS (which means Electric ceiling heating) Main system is set to Coal fires or other electric systems Secondary system select options from the two boxes describing any secondary heating system for SAP Table 11 and Table 4a (ROOM HEATER SYSTEMS) Additional gains (SAP Table 4f) Describe additional gains from SAP Table 4f for inclusion in SAP boxes 87a-87e: Central heating pumps? tick if there is a central heating water pump, or a CPSU pump (see SAP Appendix F) or a heat pump (see SAP Appendix G) Boiler oil pump? tick in the case of an oil boiler to allow for the oil pump and flue fan Gas boiler with flue fans? tick in the case of a gas boiler with a fan-assisted flue SAP 9* & 10*. Space-heating (community heating) The boxes on this tab relate to Section 9* (Space-heating requirement, SAP boxes 82*-88*), Section 10 ( * ) (Fuel costs, SAP boxes ) of the SAP worksheet, which apply if space and water heating is provided by community heating. For guidance, see Sections 9 and 10 of SAP Fuel data from this tab is also used in the sections of the SAP form headed Carbon Index (CI) for individual and community heating without CHP and Carbon Index (CI) for community heating schemes with CHP or heat recovered from power stations. VE2014 UK Building Regulations Part L

20 Community heating schemes use heat from one or more of the following three sources: CHP, recovered heat from power stations, and community boilers. Fraction of heat from CHP unit or fraction of heat recovered from power station for SAP box 83*. The remaining fraction is assumed to be provided by community boilers. Distribution loss factor for group and community schemes (SAP Table 12a) select an option for the specification of distribution loss factor in SAP box 85* Community boilers fuel (SAP Table 15) identify the fuel used by community boilers (if present). In the case of community boilers supplementing CHP or heat recovered from power stations, this will be used to set carbon emission factors in the boxes to the left of SAP boxes 109* and 112*. In the case of community heating without CHP or heat recovered from power stations, this setting is not used. The following fields apply only to community heating schemes using CHP: Electrical efficiency of CHP unit (eg 0.3) for SAP box 101* Heat efficiency of CHP unit (eg 0.5) for SAP box 102* CHP fuel (SAP Table 15) for SAP box 103*. Select a fuel for use in SAP Table 15: Carbon dioxide emission CHP heat to power ratio (enter 0 if unknown) for SAP box 106* 2.4. Data for Part L Elemental Heating Systems This tab deals with data describing the building s heating systems for the purpose of the L2 Elemental Method. Note that if the Whole-building (Office) Method is being applied, the heating system data must be re-entered in a different format under the tabs labelled Office CPR Heating Systems This list-box displays a list of heating systems serving the building. Add to the list using the Add button and remove a system by highlighting it and clicking on Remove. Highlight a system to display or edit its data in the boxes appearing beneath. Description An editable description of the selected system. Fuel The fuel supplying the heating system. Select a fuel from the list. This will affect the calculated carbon intensities. Percentage of total building heating at maximum heat output (%) If there is just one heating system, enter 100%. If there is more than one, enter the percentage of the total heat output to the building that is supplied by the selected system when the building heating load is at its maximum. (Note: heating systems are treated in terms of heat output for the L2 Elemental Method, but in terms of heat input for the methods based on Carbon Performance Rating.) VE2014 UK Building Regulations Part L

21 Gross heating system efficiency at maximum heat output (%) Enter the gross efficiency of the selected system (kwh of heat per kwh of delivered fuel) when the building heating load is at its maximum. Percentage of total building heating at 30% maximum heat output (%) If there is just one heating system, enter 100%. If there is more than one, enter the percentage of the total heat output to the building that is supplied by the selected system when the building heating load is at 30% of its maximum. Gross heating system efficiency at 30% maximum heat output (%) Enter the gross efficiency of the selected system (kwh of heat per kwh of delivered fuel) when the building heating load is at 30% of its maximum. Combined heat and power? Tick this box if the selected system is a combined heat and power (CHP) system. CHP heat to power ratio If the system is a CHP system enter its heat to power ratio (kwh of useful heat produced per kwh of electricity output). This is equivalent to the ratio of the thermal and power efficiencies of the CHP unit. Carbon intensities at maximum heat output (kgc/kwh) Beneath this label are displayed the calculated and required carbon intensities of the combined heating systems working at their maximum heat output, together with a PASS or FAIL indicator for the L2 Elemental Method heating systems requirement (ADL2 paragraph 1.25a). To obtain a PASS, the calculated value must not exceed the required value. Carbon intensities at 30% maximum heat output (kgc/kwh) Beneath this label are displayed the calculated and required carbon intensities of the combined heating systems working at 30% of their maximum heat output, together with a Required U-value adjustment factor. This factor relates to an adjustment to the threshold on average building U-value set in the L2 Elemental Construction Trade-off Method (ADL2 paragraphs ): In order to allow greater design flexibility, there can be a trade-off (in either direction) between the average U-value of the envelope and the carbon intensity of the heating system[s] provided that the rate of carbon emission is unchanged. (ADL2 paragraph 1.32). The Required U-value adjustment factor is the factor by which the required average building U-value is adjusted by the performance of the heating systems. A value less than one puts a more stringent requirement on average U-value Office CPR Nat Vent This tab deals with areas of the building that are naturally ventilated and not served by mechanical ventilation or air conditioning. The data is only used by the L2 Wholebuilding Method as applied to offices. It is used to calculate a whole-building Carbon Performance Rating (CPR) which is compared with a required (target) value. VE2014 UK Building Regulations Part L

22 Are parts of the building naturally ventilated? Tick this box if parts of the building are not served by mechanical ventilation or air conditioning. System descriptions (Heating, Heating Distribution and Lighting) These sub-tabs deal with systems serving the naturally ventilated area. Within each tab the following data must be entered: Installed capacity (input rating) / treated floor area (W/m 2 ) The input rating for the equipment referred to, expressed per square metre of treated floor area. Treated floor area excludes plant rooms, service ducts, lift-wells etc. Process requirements those relating to activities not typical of the office sector should be excluded from the treated area, together with the plant capacity, or proportion of the plant capacity, that is provided to service those areas (ADL2 paragraph 1.60d). Monitoring level A category describing the extent to which facilities for monitoring and reporting are provided. Select from the list. Plant maintenance features Tick each plant maintenance feature that applies. Or in the case of the Lighting tab, enter values specifying the percentage of the floor area benefiting from time-based lighting control, occupancy-based lighting control, daylight control or daylight availability. Whole-building Method Office CPR Beneath this label are displayed the calculated and required whole-building Carbon Performance Ratings of the mechanical ventilation system, together with a PASS or FAIL indicator for the L2 Whole-building Method mechanical ventilation system requirement (BRE Digest 457 page 5). To obtain a PASS, the calculated value must not exceed the required value Office CPR Mech Vent This tab deals with systems providing mechanical ventilation only. The data is used by the L2 Elemental Method and the L2 Whole-building Method as applied to offices. In both cases the data is used to calculate a Carbon Performance Rating (CPR) which is compared with a required (target) value. In the case of the Elemental Method the CPR rating applies to the mechanical ventilation systems only. In the case of the Whole-building Method it includes the heating and lighting systems. Is there a system providing mechanical ventilation only? Tick this box if all or part of the building is served by such a system. Is this a system alteration? Tick this box if the proposed system is an alteration of an existing system. This may require a less stringent CPR value. VE2014 UK Building Regulations Part L

23 System descriptions (Heating, Heating Distribution, Lighting and Fans) These sub-tabs deal with systems serving the mechanically ventilated area. Within each tab the following data must be entered: Installed capacity (input rating) / treated floor area (W/m 2 ) The input rating for the equipment referred to, expressed per square metre of treated floor area. Treated floor area excludes plant rooms, service ducts, lift-wells etc. Process requirements those relating to activities not typical of the office sector should be excluded from the treated area, together with the plant capacity, or proportion of the plant capacity, that is provided to service those areas (ADL2 paragraph 1.60d). Monitoring level A category describing the extent to which facilities for monitoring and reporting are provided. Select from the list. Plant maintenance features Tick each plant maintenance feature that applies. Or in the case of the Lighting tab, enter values specifying the percentage of the floor area benefiting from time-based lighting control, occupancy-based lighting control, daylight control or daylight availability. Elemental Method (MV-only) Office CPR Beneath this label are displayed the calculated and required Carbon Performance Ratings of the mechanical ventilation systems, together with a PASS or FAIL indicator for the L2 Elemental Method mechanical ventilation systems requirement (ADL2 paragraphs G10-G12). To obtain a PASS, the calculated value must not exceed the required value. Whole-building Method Office CPR Beneath this label are displayed the calculated and required whole-building Carbon Performance Ratings of the mechanical ventilation system, together with a PASS or FAIL indicator for the L2 Whole-building Method mechanical ventilation system requirement (BRE Digest 457 page 6). To obtain a PASS, the calculated value must not exceed the required value. Office CPR Air Cond This tab deals with systems providing air conditioning. The data is used by the L2 Elemental Method and the L2 Whole-building Method as applied to offices. In both cases the data is used to calculate a Carbon Performance Rating (CPR) which is compared with a required (target) value. In the case of the Elemental Method the CPR rating applies to the air conditioning systems only. In the case of the Wholebuilding Method it includes the heating and lighting systems. VE2014 UK Building Regulations Part L

24 If both new air conditioning and mechanical ventilation systems are to be installed in a building, the system types and their treated areas should be dealt with separately and the appropriate CPR achieved for each (ADL2 paragraph 1.64). If the area served by a particular system is less than 200m 2 it may be ignored for the purposes of the Whole-building Office Method (BRE Digest 457 page 3). Is there a system providing air conditioning? Tick this box if all or part of the building is served by such a system. Is this a system alteration? Tick this box if the proposed system is an alteration of an existing system. This may require a less stringent CPR value. System descriptions (Heating, Heating Distribution, Lighting, Distribution Fans & Pumps and Refrigeration System) These sub-tabs deal with systems serving the air conditioned area. The Heating, Heating Distribution and Lighting tabs apply only to the Whole-building (Office) Method. Within each tab the following data must be entered: Installed capacity (input rating) / treated floor area (W/m 2 ) The input rating for the equipment referred to, expressed per square metre of treated floor area. Treated floor area excludes plant rooms, service ducts, lift-wells etc. Process requirements those relating to activities not typical of the office sector should be excluded from the treated area, together with the plant capacity, or proportion of the plant capacity, that is provided to service those areas (ADL2 paragraph 1.60d). Monitoring level A category describing the extent to which facilities for monitoring and reporting are provided. Select from the list. Plant maintenance features Tick each plant maintenance feature that applies. Or in the case of the Lighting tab, enter values specifying the percentage of the floor area benefiting from time-based lighting control, occupancy-based lighting control, daylight control or daylight availability. Elemental Method (AC-only) Office CPR Beneath this label are displayed the calculated and required Carbon Performance Ratings of the air conditioning system, together with a PASS or FAIL indicator for the L2 Elemental Method air conditioning systems requirement (ADL2 paragraphs G10- G12). To obtain a PASS, the calculated value must not exceed the required value. VE2014 UK Building Regulations Part L

25 Whole-building Method Office CPR Beneath this label are displayed the calculated and required whole-building Carbon Performance Ratings of the air conditioning system, together with a PASS or FAIL indicator for the L2 Whole-building Method air conditioning system requirement (BRE Digest 457 page 7). To obtain a PASS, the calculated value must not exceed the required value Database Click this button to access the user database of building regulations Building and System Data. The database presents a list of entries each containing a complete set of building regulations Building and System Data. Its purpose is to provide a facility for storing data settings for later reuse. Changes to the database and the project data only take effect when the OK button is clicked on exit. You may abandon the database session using Cancel. Selecting a database entry Click on a database entry to select it. Editing a database entry The area on the right of the dialogue headed Building & System Data displays the data in the selected entry and allows you to edit it. Save to database Saves the contents of the selected database entry to the database. Should you omit to click this button following edits a message will prompt you to save the data. Copy to project Copies the contents of the selected database entry to the project. Copy from project Copies the Building and System Data from the project to the selected database entry. Add Creates a new database entry. The data is initialised with the data in the currently selected entry. Remove Removes the selected entry from the database. Rename Allows renaming of the selected entry. You can also rename an entry by doubleclicking on its name. VE2014 UK Building Regulations Part L