Conservation of fuel and power: Approved Document L, Volume 2 — Buildings other than dwellings

O N L I N E V E R S I O N L1(b), L2 c. Benchmarks the building’s energy efficiency, detects losses in efficiency of heating, ventilation and air conditioning systems, and informs the person responsible for the facilities or building management about opportunities for energy efficiency improvement. d. Allows communication with connected fixed building services and other appliances inside the building and is interoperable with fixed building services across different types of proprietary technologies, devices and manufacturers. NOTE: A BS EN 15232 Class A rated type system would meet these requirements. 6.73 Where a building automation and control system is installed, its control capabilities should be appropriate for the building, its expected usage and the building services specification. On-site electricity generation and storage 6.74 Where on-site electricity generation and storage is installed, such as photovoltaic panels or battery storage, systems should be an appropriate size for the site, available infrastructure and on-site energy demand. 6.75 The system should be specified and installed according to the manufacturer’s instructions to ensure the overall performance of the system meets a reasonable standard. 6.76 When replacing an existing system, the installed generation capacity of the new system should be no less than that of the existing system, except where a smaller system can be demonstrated to be more appropriate or effective (e.g. replacing an existing system with a system which is better matched to the building’s energy demand). 6.77 On-site electricity generation should be provided with automated controls that support the design of the system and the intended use. This is particularly the case where electricity generation and storage systems are used, such as batteries. District heat networks and community heating 6.78 The central heat source for community heating systems should comply with the relevant minimum standards outlined throughout Section 6 of this approved document. 6.79 A district heat network that is being connected to a new building should not have a CO emission 2 factor for delivered heat to the building which is greater than 0.350kgCO /kWh. 2 NOTE: The same CO emission factors used to calculate the building emission rate described 2 in paragraph 2.7 of this approved document should be used to check against the minimum performance standards described in paragraph 6.79. 55 Building Regulations 2010 Approved Document L Volume 2, 2021 edition O N L I N E V E R S I O N