WHO IS CIBSE? The professional body that exists to support the Science, Art and Practice of building services engineering, by providing our members and the public with first class information and education services and promoting the spirit of fellowship which guides our work. CIBSE is the 6 th largest Professional Engineering Institution with over 21,000 members worldwide lighting, heating and ventilation, the lifts and escalators, acoustics, plumbing, power supply and energy management systems, security and safety systems 2
CIBSE provides best practice advice CIBSE is a global standard setter and authority on building services engineering. It publishes peer reviewed Guidance and Codes which are internationally recognised as authoritative, and sets the criteria for best practice in the profession. www.cibse.org
4
METERING GUIDANCE CIBSE TM39
Introduction If you can t measure it, you can t manage it This is as true of energy and resource consumption as of many other commodities or services CIBSE TM39 provides guidance on measurement of the consumption of energy and heat in non-domestic buildings Without metered energy consumption data we cannot seriously claim to understand how well our buildings perform And yet, we seem to be brilliant at getting something as basic as this wrong far too often 6
The Purpose of Metering Appropriate energy metering systems enable owners, occupiers and operators to measure energy, water or heat consumption in their buildings day by day. This information can then be used to identify energy and cost saving opportunities, provide accurate energy or water usage data or bills to tenants, to assist with energy and emissions reporting requirements and to help the management of environmental and sustainability services and impacts. 7
OUTLINE
Outline Why is building energy metering important to measuring building performance? What do we mean by sub-metering? What is the point of sub-metering? Who is sub-metering really for? What s new in the new CIBSE TM39? 9
WHY IS BUILDING ENERGY METERING IMPORTANT TO MEASURING BUILDING PERFORMANCE?
Why is building energy metering important to measuring building performance? Because of an increasing demand by the market for buildings that meet occupant requirements Because of increasing focus on the performance of built environment assets by investors Because of increasing interest in performance as expressed through voluntary schemes such as NABERS Which all requires measurement of performance against intended outcomes 11
The growing importance of Measurement and Feedback Being driven by the drive to BIM and wider adoption of digital technologies PLANNING FOR CONSTRUCTION AND OPERATION Define Outcomes Design Tender Build Commission Handover and Maintenance Procurement Monitor and Measure Outcomes Continuous Feedback Evidence based construction We need clearly defined outcomes if you aim at nothing you are sure to hit it!
14 WWW.BENTLEY.COM RIBA Plan of Work 2013: Mapping
TM 39 the process Aligned with the new RIBA Plan of Work
The Work stages GUIDE A: ENVIRONMENTAL DESIGN TM39 BUILDING ENERGY METERING TM54 - DESIGN STAGE ENERGY EVALUATION COMMISSIONING CODES TM31 TM22 CIBSE GUIDE M: MAINTENANCE 16 WWW.BENTLEY.COM
TM54: Evaluating operational energy performance of buildings at the design stage Aims to: - inform the response to a project brief on energy performance - provide a methodology to calculate operational energy use, rather than just undertake building code compliance calculations 17 TM54 is now being required by major UK developers. NABERS goes further still.
TM39: Building Energy Metering TM39 provides guidance on how to collect the data to demonstrate whether actual measured performance is in line with the design intent. The information from building energy sub metering helps to close the feedback loop between actual measured performance and design aspirations 18
WHAT IS THE POINT OF SUB-METERING?
Sub metering METERING Part L the then energy efficiency code for England and Wales (Wales now has its own code) introduced a provision for sub-metering in 2002: for buildings over 500 m 2, covering 90% of energy supply, and covering each fuel supply separately. This was part of a package of measures to improve the information available to building owners. CIBSE TM39 was produced in response, and was revised in 2009, to provide detailed guidance on how to meet the requirements for sub meters.
BETTER INFORMATION LEADS TO BETTER BUILDINGS
Sub metering But some questions soon emerged! METERING Does anyone check that sub meters are correctly installed? connected? used? (or even incorrectly used??) More recently, it has become clear that in many cases the whole purpose of installing sub-metering is at best misunderstood and at worst not understood at all! And in the course of preparing the 2017 edition, it has become very clear that we need a whole new section on the objectives of sub-metering.
Why install sub metering? Energy is used to deliver comfortable, healthy and productive places of work, study, treatment, recreation or assembly. There are a number of reasons for submetering energy used in these premises: - Compliance with statutory or voluntary energy or emissions reporting requirements - Compliance with legal requirements for accurate tenant energy billing in multi tenanted buildings or for serviced concessions operating within a building; - To inform energy management through better knowledge and understanding of a building s energy use and costs, to reduce wasteful operation and to improve operational performance; METERING
Why install sub metering? (continued) Broader reasons for sub-metering energy consumption: - To enable a harmonised and transparent approach to building energy performance benchmarking and rating and so to encourage stronger engagement by all stakeholders in delivering better performance outcomes. - To provide feedback to designers and building modellers (especially in new build and major refurbishment) by enabling comparison of actual energy use with models and so to improve future designs and the reliability and insight of models. METERING
I want sub metering installed what do I specify? The specifier needs to be clear why they are specifying sub metering: what outcomes are required? METERING The specification needs to be clear why sub metering is being specified and communicate the required outcomes clearly. Designers are not generally mindreaders! The specifier needs to ensure that responses to any sub metering requirement demonstrate an understanding of the reasons for sub metering and can deliver the required outcomes.
WHAT DO WE MEAN BY SUB-METERING?
Scope of TM39 Covers metering of electricity, gas and heat in non residential buildings; also addresses metering of energy generated from renewables and other on-site sources; can also include water consumption; intended to enable building owners and occupiers to understand how much energy their building or buildings are using. may also be used as a basis for billing of tenants or occupiers for energy use This will enable them better to understand how those buildings perform for their occupiers. METERING
WHO IS SUB-METERING REALLY FOR?
Who is sub-metering for? The Designer? Installer? Commissioning Engineer? The planning authority or utility provider? How about: The Building Owner The Building Occupiers METERING
WHAT S NEW IN THE NEW CIBSE TM39?
TM39: Building Energy Metering The Cover The benefits The focus The guidance on why we sub-meter The removal of virtual meters The detailed procedure New case studies 31
Benefits of installing sub metering: - compliance with statutory or voluntary energy or emissions reporting requirements; - compliance with legal requirements for accurate tenant energy billing in multi tenanted buildings or for serviced concessions operating within a building; - informing energy management through better knowledge and understanding of a building s energy use and costs, to reduce wasteful operation and to improve operational performance; - enabling a harmonised and transparent approach to building energy performance benchmarks and ratings; - feedback to designers and building modellers to enable comparison of actual energy use with models, to improve future designs and reliability of models. METERING
The focus of sub metering It is essential to design systems with the likely end user in mind. Owners of large portfolios who operate and manage their own buildings have different needs to owners of multi let buildings which are managed by agents who are selected by a competitive tendering process that may be repeated every few years and will not deliver continuity of personnel to use the metering system. The client needs to understand what they want from sub-metering, specify clearly the outcomes they require, and say who the end users will be.
The specification of sub metering It is essential that clients take ownership of the specification of metering systems. The client needs to understand and communicate what they want the system to deliver and be clear about how it will be used, who will use it, and what information they require from the system. Metering systems must be specified with the building management regime in mind. Where metering is required to support a voluntary labelling scheme (eg NABERS) or to meet statutory requirements (eg Metering and Billing Regulations in England and Wales) then that must be made clear in the specification.
Specification of sub metering (2) Designers need to test the specification to ensure that it is clear about - how it will be used, - who will use it, and - what information is required from the proposed system. Metering systems must be designed with the building management regime in mind. Owner occupiers of many buildings have a different approach to commercial developers of multitenanted buildings. They need different systems. Designers need to understand where the system is required to support a voluntary labelling scheme or to meet statutory requirements.
Health Warning (1) Specifying sub metering to comply with CIBSE TM39 is NOT an acceptable specification. Clients should not issue such specifications; Designers should challenge such specifications and ask the questions detailed above; By definition, any specification which asks solely for compliance with TM39 will be demonstrably at variance with the guidance itself. And if one of these specifications or designs ever gets to the installer, they might want to run it over to the legal team asap for a view on possible liabilities or disclaimers!
Health Warning (2) Submetering in itself does not save energy! It provides information about how much energy is being used, and where it is being used. It is the action taken as a result of installing meters and using the information they provide that can achieve quantifiable energy savings. It is therefore essential that metering systems are designed with a clear understanding of the needs of the client for the information that they generate. Metering systems that are selected, installed and commissioned correctly can inform effective energy management practice.
What about virtual meters? We have removed virtual meters (calculating energy consumption by deduction of one metered circuit from an unmetered circuit. METERING Experience has shown that it just does not work in practice.
TM 39 the process 2009 edition 4.1 Step 1: Select the TM39 boundary 4.2 Step 2: List all energy imported and exported across boundary 4.3 Step 3: List all energy-using items within boundary 4.4 Step 4: Decide which items should be metered 4.5 Step 5: Select appropriate meter for each item 4.6 Step 6: Decide location(s) of meter(s) 4.7 Step 7: Decide how the meters are to be read 4.8 Step 8: Review the metering strategy 4.9 Step 9: Specify, implement and commission the metering 4.10 Step 10: Documenting the strategy
There are new case studies: based on more recent examples of the successful application of sub metering, supplied by major building owners. And there is a new section to explain the concept of the base building, particularly addressing the requirements of the NABERS scheme in this area. METERING
Free access to downloads of more than 350 titles A unique online tool that allows instant access to over 350 free titles and unlimited CIBSE member downloads of the full range of CIBSE published guidance and thousands of abstracts of British Standards. www.cibse.org/knowledge
CIBSE Knowledge Portal Access to search and download the full range of building services guidance from CIBSE, including: CIBSE Guides CIBSE Commissioning Codes Applications Manuals Technical Memoranda Lighting Guides www.cibseknowledgeportal.co.uk
Thank you for listening Questions welcome! hdavies@cibse.org
What have I got here? Which one is for where? Anyone heard of labelling? 44