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Building Energy Metering (a guide to energy sub-metering in non-domestic buildings TM 39
The case for sub-metering is now sufficiently well established that in England and Wales Part L of the Building Regulations requires installation of sub-metering for new non-domestic buildings and also, in some cases, for refurbishment.
Sub-metering contributes to good energy management, and the strategy for energy metering in a building should be included in the building log book (which is also a requirement of the Building Regulations in England and Wales).
Good metering underpins the energy monitoring and targeting process which is an essential part of energy management. The guidance in this TM will enable energy managers to ensure that they are getting the information they need from their meters, to enable them to deliver added value to their business through good energy management
Most buildings have incoming meters for billing purposes. They measure the total input of the specific fuel to the site. Regular meter readings will provide some information about the overall energy consumption, but it reveals little about where the energy problems lie.
Installing sub-metering throughout a building to monitor the specific uses of the fuel being metered can help identify which end-use or service (e.g. lighting, fans, pumps etc.) is performing well, or badly, allowing more targeted action.
Sub-metering provides the measurements to identify where and when energy is being wasted. Designers wanting to deliver good practice design should incorporate sub-metering in buildings in order to provide the occupier with the systems to enable the building to be managed properly.
Facilities managers should assess their existing buildings to see where metering would help improve building management.
This TM is an updated version of General Information Leaflet 65 (GIL 065): Metering energy use in non-domestic buildings. GIL 65 was first published by the Energy Efficiency Best Practice Programme, and subsequently adopted by the Carbon Trust.
Chartered Institution of Building Services Engineers CIBSE
Chartered Institution of Building Services Engineers
Standard Form of Cost Analysis: Principles, Instructions and Definitions
Renewable Energy in Power Systems
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