TR37 2015 Preview

Building Engineering Services Association Guide to good practice:INSTALLATIONOF COMBINEDHEAT AND POWER TR/37 www.theBESA.com



Table of contents Symbols and abbreviations......................................................................................................... 7 1 Introduction ..............................................................................................................................11 1.1 Why you need to know about combined heat and power........................................... 11 1.2 Why it matters for contractors .............................................................................................. 12 1.3 Application of this guidance ................................................................................................... 12 1.3.1 Standard of workmanship ......................................................................................... 13 1.3.2 Quality assurance ......................................................................................................... 13 2 Understanding CHP ...............................................................................................................15 2.1 What is CHP? ................................................................................................................................ 15 2.2 Benefits of using CHP, and disadvantages ....................................................................... 19 Improved energy efficiency .................................................................................................... 20 Overall energy costs can be reduced.................................................................................. 20 Environmental improvements................................................................................................ 20 Increased security of power supply..................................................................................... 21 Flexibility and reliability ........................................................................................................... 21 CHP for existing buildings as a replacement / refurbishment option ..................... 21 Delivering the benefits ............................................................................................................. 21 Disadvantages ............................................................................................................................. 22 2.3 Government policy, legislation and incentives................................................................ 23 2.4 Applications................................................................................................................................... 23 Tri-generation .............................................................................................................................. 24 2.5 Siting of CHP plant ..................................................................................................................... 25 2.6 Case studies ................................................................................................................................. 25 Small-scale systems .................................................................................................................. 25 District heating ............................................................................................................................ 26 Industrial applications .............................................................................................................. 26 Hospitals ........................................................................................................................................ 26 3 CHP and the project..............................................................................................................27 3.1 Types of project .......................................................................................................................... 27 3.2 The decision process and timeline ....................................................................................... 28 3.3 Project team responsibilities for CHP scheme ................................................................. 28 3.4 Contractor responsibilities ...................................................................................................... 30 3.5 Specification ................................................................................................................................. 30 Demarcations between CHP contract and others........................................................... 30 CHP capacity................................................................................................................................. 31 Voltage generated ...................................................................................................................... 31 Heating circuit temperatures ................................................................................................. 31INSTALLATION OF COMBINED HEAT AND POWERBESA Good Practice Guide TR37Building Engineering Services Association

Heat rejection requirements .................................................................................................. 32 Ambient temperatures.............................................................................................................. 32 Space available, internal or external siting ...................................................................... 32 Fuel supply .................................................................................................................................... 32 Exhaust termination .................................................................................................................. 32 Acoustic constraints................................................................................................................... 32 NOx limits ...................................................................................................................................... 32 Other planning conditions ....................................................................................................... 32 Fire detection/suppression and interface with main fire detection system.......... 33 Controls and mode of operation ........................................................................................... 33 Monitoring and BEMS interface ............................................................................................. 33 Metering ......................................................................................................................................... 33 Lubricating oil system............................................................................................................... 33 Delivery .......................................................................................................................................... 33 Commissioning ............................................................................................................................ 33 Off-site testing............................................................................................................................. 33 On-site testing ............................................................................................................................. 33 Documentation ............................................................................................................................ 34 Maintenance contract................................................................................................................ 34 Training .......................................................................................................................................... 34 Requirements to liaise with the DNO .................................................................................. 34 Requirements to liaise with others ...................................................................................... 34 3.6 Compliance with regulations .................................................................................................. 34 Health and safety ....................................................................................................................... 35 Environmental protection ........................................................................................................ 36 Building regulations and energy conservation ................................................................ 37 Electrical installation ................................................................................................................. 38 Plumbing installation ................................................................................................................. 39 4 Installation practicalities ..................................................................................................40 4.1 General requirements for installation ................................................................................. 40 Mechanical installation ............................................................................................................. 40 Electrical installation ................................................................................................................. 40 4.2 Ancillary equipment and requirements .............................................................................. 41 Fuel supply, storage and handling ....................................................................................... 41 Ventilation ..................................................................................................................................... 41 Combustion air ............................................................................................................................ 42 Exhaust system ........................................................................................................................... 42 Pipework ........................................................................................................................................ 43 Water treatment ......................................................................................................................... 43 Plant room safety ....................................................................................................................... 43 4.3 Controls, monitoring and metering ..................................................................................... 44 CHP controls ................................................................................................................................. 44 Monitoring ..................................................................................................................................... 45 Heating system controls .......................................................................................................... 46 Metering ......................................................................................................................................... 46INSTALLATION OF COMBINED HEAT AND POWERBESA Good Practice Guide TR37Building Engineering Services Association

4.4 Testing and commissioning .................................................................................................... 46 CHP package or system ........................................................................................................... 46 Fuel system................................................................................................................................... 47 Electrical systems....................................................................................................................... 47 Heating systems ......................................................................................................................... 48 Commissioning documentation ............................................................................................. 48 4.5 Handover ....................................................................................................................................... 48 4.6 Post-installation audit and lessons learnt ......................................................................... 49 Lessons learned .......................................................................................................................... 49 Commissioning ............................................................................................................................ 50 4.7 Key points checklist ................................................................................................................... 50 Pre-installation and construction .......................................................................................... 51 Installation .................................................................................................................................... 51 Final connections ........................................................................................................................ 51 Testing, flushing and filling..................................................................................................... 52 ‘Go live’ stage .............................................................................................................................. 52 5 Further guidance and help ...............................................................................................53 5.1 Websites......................................................................................................................................... 53 5.1.1 Websites and freely downloadable resources .................................................... 53 5.1.2 Links .................................................................................................................................. 54 5.2 Publications................................................................................................................................... 54 5.2.1 References to buy or borrow.................................................................................... 54 6 References and bibliography ..........................................................................................55 BESA publications ...................................................................................................................... 55 BSRIA publications..................................................................................................................... 55 CIBSE publications ..................................................................................................................... 55 Other ............................................................................................................................................... 56 The Institution of Gas Engineers and Managers............................................................. 57 Legislation and compliance..................................................................................................... 58 Health & Safety Regulations .................................................................................................. 58 Other British Standards ........................................................................................................... 59INSTALLATION OF COMBINED HEAT AND POWERBESA Good Practice Guide TR37Building Engineering Services Association