SUS01 - Heat Metering Guide 2015 - Preview

building engineering services association Guide to good practice:Heatmetering1st edition | June 2015 www.thebesa.com

building engineering services associationGuide to good practice: acknowledgmentsHeat the Building engineering Services association would like tometering acknowledge and thank the following for their support in pro- ducing the guide andrew eastwell BSria anthony evans Delta Flowtech Clive earp Clive granger rollright Facilities Limited Colin ashford David Palmer Campbell Palmer Partnership Limited edmund Ward Ofgem matthew J Kidner neville martin Shetland island Council Paul Balmer gaSteC at Cre Paul Chamberlain Kamstrup instrumentation Limited Peter Hamnett UK District energy association Stephen Oakman Kamstrup instrumentation Limited Jerry Shord matthew Hall Will Pitt ng Bailey team (energy auditing agency Limited) Justine grant Princess Opara Building engineering Services association technical Committee Bob towse Former Head of Technical & Safety David Frise Head of Sustainability Sarah Wicks Former Head of Education & Training besa Publications Old mansion House eamont Bridge Penrith Ca10 2BX 01768 860405 [email protected]. www.thebesa.com

Table of contents 1. Introduction ...................................................................................... 9 1.1 Heat metering in the context of the Renewable Heat Incentive (RHI)........... 9 1.1.1 Further information ............................................................................. 10 1.1.2 Other requirements for Heat Metering ................................................... 11 1.1.3 The importance of accuracy and the potential pitfalls............................... 11 2. Design ............................................................................................. 11 2.1 The principles of Heat Metering............................................................. 11 2.2 Heat transmission formula ................................................................... 12 2.3 Location of meters within the heat network ............................................ 13 2.4 Disregarding losses from ‘properly insulated’ external pipework ................ 13 2.5 Unduly burdensome metering ............................................................... 15 2.5.1 Examples of situations considered ‘unduly burdensome’ for the installation of additional metering for RHI purposes..................................................... 15 3. Specification .................................................................................... 16 3.1 Types of meters.................................................................................. 16 3.2 Types of flow meters ........................................................................... 17 3.3 Characteristics of flow meters............................................................... 17 3.4 Numbers of meters required for RHI eligibility ........................................ 18 3.5 Measuring Instruments Directive........................................................... 19 3.6 Recognising MID Class 2 ...................................................................... 20 3.7 Accuracy (flow and temperature) .......................................................... 20 3.8 Importance of fluid types ..................................................................... 20 3.9 Calculator/Integrator calculation options ................................................ 21 3.10 Multiple channels and meters for reverse flow systems (eg reverse cycle heat pumps).............................................................. 21 4. Installation ...................................................................................... 22 4.1 Confirming the delivered meters meet the specification ........................... 22 4.2 Good practice for installation ................................................................ 22 4.3 Specific location and positioning requirements ........................................ 23 4.4 Flow development ............................................................................... 25 4.5 Temperature sensor locations ............................................................... 27 4.6 Locating the Heat Meter components..................................................... 29BESA GUIDE TO GOOD PRACTICEHeat metering | 1st Edition August 2015Building Engineering Services Association

5. Commissioning ................................................................................ 30 5.1 Testing and calibration ........................................................................ 30 5.2 Installation check................................................................................ 30 5.3 Heat meter security............................................................................. 31 6. Operation ........................................................................................ 31 6.1 Information for operators and owners.................................................... 31 6.2 Maintenance and re-calibration requirements ......................................... 31 6.3 Identifying poor data quality ................................................................ 32 7. Data collection................................................................................. 33 7.1 Methods of data collection.................................................................... 33 7.1.1 Manual readings ................................................................................. 33 7.1.2 Remote meter reading ......................................................................... 33 7.1.3 BMS and M-Bus options ....................................................................... 34 8. Inspection and audit........................................................................ 34 Evidence pack ............................................................................................... 34 9. Case studies .................................................................................... 35 9.1 CASE STUDY Residential Communal Heating Biomass .............................. 35 9.2 CASE STUDY Retail unit with biomass boiler ........................................... 35 9.3 CASE STUDY Supermarket with biomass boiler ....................................... 36 9.4 CASE STUDY Community Centre and Library .......................................... 36 9.5 CASE STUDY Retail unit with Ground Source Heat Pump .......................... 36 10. Recommended reading and useful links .......................................... 37 Table of figures Figure 1 A heat meter, comprising a flow meter, a calculator and twin temperature sensors ...................................................................................................... 12 Figure 2 Ultrasonic Flow Meter ..................................................................... 17 Figure 3 Table of Flow Meter characteristics ................................................... 18 Figure 4 Heat Meter layout. This heat meter measures only the output of the eligible boiler, avoiding the ineligible boiler and the boiler backend protection pump circuit......................................................................................................... 23BESA GUIDE TO GOOD PRACTICEHeat metering | 1st Edition August 2015Building Engineering Services Association

Figure 5 Simple Heat Meter layout. This heat meter measures only the eligible output of the solar thermal, avoiding the ineligible electrical immersion .............. 23 Figure 6 Most flow meters with electronic boxes must be fitted off the vertical to reduce the effect of air and dirt in the system ................................................. 25 Figure 7 Different flow speed profiles ............................................................ 25 Figure 8 Some suitable and unsuitable locations for a flow meter ..................... 26 Figure 9 A temperature sensor being fitted into a pocket and secured ............... 27 Figure 10 Temperature sensors in pockets showing ideal projection into pipework to centre of pipe .......................................................................................... 28 Figure 11 Pipework with flow meter and temperature sensor probe fitted in pocket, overlong cable coiled and tied up securely. ..................................................... 29 Figure 12 Loose temperature probe ................................................................... 35 IMPORTANT NOTICE Whilst reasonable steps have been taken to ensure that the information contained within this report is correct, you should be aware that the information contained within it may be incomplete, inaccurate or may have become out of date. Accordingly, TEAM (EAA Limited.) make no warranties or representations of any kind as to the content of this report or its accuracy and, to the maximum extent permitted by law, accept no liability whatsoever for the same including, without limit, for direct, indirect or consequential loss, business interruption, loss of profits, production, contracts, goodwill or anticipated savings. Any person making use of this report does so at his or her own risk [and it is recommended that they seek professional advice from their own adviser whenever appropriate]. Estimates of costs and savings are based on site observations, published case studies, technical references and professional experience. They should be regarded with caution, and recommendations are subject to detailed feasibility studies. Nothing in this report is intended to be or should be interpreted as an endorsement of, or recommendation for, any supplier, service or product.BESA GUIDE TO GOOD PRACTICEHeat metering | 1st Edition August 2015Building Engineering Services Association