Data Input Baseline Tailoring

Transcription

1 ABBE Level 4 Diploma in Non- Domestic Green Deal Advice 7. Operational Profile: Data Extraction Presented by Tony Balaam Data Input Baseline Tailoring CIBSE Guidance Non-Domestic GDA Training 7. Operational Profile: Data Extraction Training Material Stroma Certification 2012 Version Data Input Baseline Tailoring Non-Domestic GDA Training 7. Operational Profile: Data Extraction Training Material Stroma Certification 2012 Version Operational Profile: Data Extraction After you have carried out the operational profile assessment you will need to extract the data and calculate the appropriate values in order to enter them into the software. You will need to use various reference guides for some of the values; some key documents are listed on the next slide. Non-Domestic GDA Training 7. Operational Profile: Data Extraction Training Material Stroma Certification 2012 Version Stroma Certification November 2012 Issue 1.1 1

2 General and Lighting Data (Nominal Parameters) It is vital that this data is gathered on site accurately. It should be sense-checked against relevant guidance documents, including but not limited to the following, to compare design parameters against the actual building parameters. General and Lighting (Nominal Parameters) Input Data Occupancy density CIBSE Guide A Table Guidance Document Equipment gains CIBSE Guide A Table 6.2 CIBSE Guide F Table 12.1 (examples of levels of energy used by office equipment) Cool set point Heat set point Hot water use Fresh air rate Must be taken from site. Comparative design guidance can be found in CIBSE Guide A Table 1.5 Must be taken from site. Comparative design guidance can be found in CIBSE Guide A Table 1.5 Plumbing Engineering Services Design Guide The Institute of Plumbing CIBSE Guide G Table 2.1 BSRIA Airflow measurement methods Non-Domestic GDA Training 7. Operational Profile: Data Extraction Training Material Stroma Certification 2012 Version Internal Heat Gains Internal heat gain is the sensible and latent heat emitted within an internal space from any source, which is to be removed by air conditioning or ventilation, and/or results in an increase in the temperature and humidity within the space. It includes the following sources: Bodies (human and animal) Lighting Computers and office equipment Electric motors Cooking appliances and other domestic equipment Non-Domestic GDA Training 7. Operational Profile: Data Extraction Training Material Stroma Certification 2012 Version Occupancy Density An occupancy density, metabolic rate, and schedule of occupancy are used to calculate the internal heat gain from people. The percentage of the metabolic gains which are sensible rather than latent (released as moisture) is also taken into account. 1. Compare the data that you have gathered in your pre-visit questionnaire and the number of occupants counted on site PER ZONE. Work out an average. 2. Work out the area of each zone (m 2 ) 3. Calculate density of occupation (persons/m 2) Non-Domestic GDA Training 7. Operational Profile: Data Extraction Training Material Stroma Certification 2012 Version Stroma Certification November 2012 Issue 1.1 2

3 Equipment Gains Personal computers (PCs) and associated office equipment result in heat gains to the room equal to the total power input. The internal heat gains for this equipment is normally allocated as an allowance in watts per square metre (W/m 2 ) of net usable floor area. Again, using your pre-assessment and onsite data, calculate the total power input of each equipment type, and calculate the (W/m 2 ) of net usable floor area PER ZONE. Typical values are given in Table 6.2 of CIBSE Guide A. The internal heat gains can be estimated from basic data but care must be taken to allow for diversity of use, idle operation and the effects of energy saving features of the equipment. CIBSE Guide F Table 12.1 examples of levels of energy used by office equipment. Non-Domestic GDA Training 7. Operational Profile: Data Extraction Training Material Stroma Certification 2012 Version Heating and Cooling Set Points The heating and cooling set-points define the conditions which the selected HVAC system will be assumed to maintain for the period defined by the heating and cooling schedules. For the unoccupied period, the system will be assumed to maintain the space at the set back temperature defined in the database. The heating and cooling set points must be recorded on site. Non-Domestic GDA Training 7. Operational Profile: Data Extraction Training Material Stroma Certification 2012 Version Hot Water Demand Within SBEM, a hot water demand is defined for all occupied spaces. The hot water demand is associated with the occupied spaces rather than the spaces where the hot water is accessed: e.g. there is a demand for hot water associated with an office rather than a toilet or a tea room. Therefore, when tailoring the hot water demand, you should use your pre and on site data to calculate: Number of occupants per zone x l/per/day This is based on the type of building (see overleaf Table 6, Plumbing Engineering Services Design Guide The Institute of Plumbing or CIBSE Guide G Table 2.1) Non-Domestic GDA Training 7. Operational Profile: Data Extraction Training Material Stroma Certification 2012 Version Stroma Certification November 2012 Issue 1.1 3

4 Hot Water Demand Non-Domestic GDA Training 7. Operational Profile: Data Extraction Training Material Stroma Certification 2012 Version Air Flow Rate Fresh air is necessary to provide building occupants with a comfortable environment, and air conditioning systems often vary the fresh air flow rate between a set minimum and full outside air, to reduce the need for additional heating and cooling. For long periods in winter, and also during peak summer, systems typically operate on minimum fresh air, and this should be optimised to the requirements of the building and occupants. However, measuring minimum fresh air accurately is often difficult because air flow rates are typically low, space may be restricted, and installations may not have been designed adequately for commissioning. Air flow rate is unlikely to be measured onsite due to these constraints and therefore tailoring of this parameter is unlikely. For the methods of calculation, please refer to BSRIA Airflow measurement methods Non-Domestic GDA Training 7. Operational Profile: Data Extraction Training Material Stroma Certification 2012 Version General and Lighting Data (Lighting Parameters) It is vital that this data is gathered on site accurately. It should be sense-checked against relevant guidance documents, including but not limited to the following, to compare design parameters against the actual building parameters. General and Lighting (Lighting Parameters) Lux Level Input Data Guidance Document The Society of light and lighting (On site data) Display lighting Light time start Light time end Light time start (hols) Light time end (hols) The Society of light and lighting (On site data) On site data On site data On site data On site data Non-Domestic GDA Training 7. Operational Profile: Data Extraction Training Material Stroma Certification 2012 Version Stroma Certification November 2012 Issue 1.1 4

5 Lux Levels In a similar vein to fresh air rates, measuring lux levels onsite is very difficult to do. The disruption to a working environment is such that, on a purely practical level, measuring of lux levels and therefore tailoring of this parameter is unlikely. However, common methods of measurement are described in the following slides. Non-Domestic GDA Training 7. Operational Profile: Data Extraction Training Material Stroma Certification 2012 Version Lux Levels : Measurement An instrument designed to measure light levels is called a lux meter. These can be purchased or hired from instrument hire businesses. Where to take measurements: At 5 or 6 different locations in the room/zone being measured. At desk height for classrooms and offices, and at the floor level for general passageways such as corridors. When to take measurements: The amount of light a room receives from its windows will vary at different times of the day and year. Lux readings should be taken when day lighting is at a minimum, and in order for the readings to be accurate, the windows should be blacked out. Non-Domestic GDA Training 7. Operational Profile: Data Extraction Training Material Stroma Certification 2012 Version Data Input Baseline - Tailoring How to take measurements: Place the sensor where you wish to take measurement, allow the readout to stabilise and then take note of the reading. Lux readings can vary by as much as Lux within a distance of only a few centimetres, so it is good practice to take a couple of measurements in the same general position and note the lowest figure. Movement of people near the sensor will affect the reading so try to minimise activity near the sensor at time of reading. Standing between light sources and the sensor will lower Lux readings. There is another method of measurement, which causes less disruption and can be used to check the values against the NCM. Non-Domestic GDA Training 7. Operational Profile: Data Extraction Training Material Stroma Certification 2012 Version Stroma Certification November 2012 Issue 1.1 5

6 Lux Levels: Advanced Tailoring Advanced Tailoring (NDEA L4 Only) Input Data Equation used Symbol Meaning Occupancy gains (wh/ m2) Equipment gains (wh/ m2) Hot water use (litres/ m2) (np*mgainspp) m² Total (watts per m²) * nhrs per month npi*npp m² Total (watts per m²) * nhrs per month l/m2/day*ndpm NB:. The sensible heat and Latent heat needs to be accounted for to be in keeping with the NCM. np mgainspp nhrs npi npp ndpm Number of people Metabolic gains per person Number of hours Number of power items Nameplate power Number of days per month Non-Domestic GDA Training 7. Operational Profile: Data Extraction Training Material Stroma Certification 2012 Version CIBSE Guidance Non-Domestic GDA Training 7. Operational Profile: Data Extraction Training Material Stroma Certification 2012 Version CIBSE Guide A Table 6.3 Non-Domestic GDA Training 7. Operational Profile: Data Extraction Training Material Stroma Certification 2012 Version Stroma Certification November 2012 Issue 1.1 6

7 CIBSE Guide A Table 6.2 Non-Domestic GDA Training 7. Operational Profile: Data Extraction Training Material Stroma Certification 2012 Version CIBSE Guide A Table 6.2 Non-Domestic GDA Training 7. Operational Profile: Data Extraction Training Material Stroma Certification 2012 Version CIBSE Guide A Table 6.2 Non-Domestic GDA Training 7. Operational Profile: Data Extraction Training Material Stroma Certification 2012 Version Stroma Certification November 2012 Issue 1.1 7

8 Property of Stroma Cer0fica0on 02/11/2012 CIBSE Guide F Table 12.1 Non-Domestic GDA Training 7. Operational Profile: Data Extraction Training Material Stroma Certification 2012 Version CIBSE Guide A Table 1.5 Non-Domestic GDA Training 7. Operational Profile: Data Extraction Training Material Stroma Certification 2012 Version CIBSE Guide A Table 1.5 Non-Domestic GDA Training 7. Operational Profile: Data Extraction Training Material Stroma Certification 2012 Version 1.0 Stroma Certification November 2012 Issue

9 CIBSE Guide A Table 1.5 Non-Domestic GDA Training 7. Operational Profile: Data Extraction Training Material Stroma Certification 2012 Version Questions? Non-Domestic GDA Training 7. Operational Profile: Data Extraction Training Material Stroma Certification 2012 Version Contacts Stroma Certification Ltd. 4 Pioneer Way, Castleford, WF10 5QU training@stroma.com Web Links Non-Domestic GDA Training 7. Operational Profile: Data Extraction Training Material Stroma Certification 2012 Version Stroma Certification November 2012 Issue 1.1 9