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 R25A Regulation continued (5) In this regulation— (a) “ cogeneration” means simultaneous generation in one process of thermal energy and one or both of the following— (i) electrical energy; (ii) mechanical energy; (b) “ district or block heating or cooling” means the distribution of thermal energy in the form of steam, hot water or chilled liquids, from a central source of production through a network of multiple buildings or sites, for the use of space or process heating or cooling; (c) “ energy from renewable sources” means energy from renewable non-fossil sources, namely wind, solar, aerothermal, geothermal, hydrothermal and ocean energy, hydropower, biomass, landfill gas, sewage treatment plant gas and biogases; and (d) “ heat pump” means a machine, a device or installation that transfers heat from natural surroundings such as air, water or ground to buildings or industrial applications by reversing the natural flow of heat such that it flows from a lower to a higher temperature. (For reversible heat pumps, it may also move heat from the building to the natural surroundings.) NOTE: Where the building control body is an approved inspector, see regulation 20 of the Building (Approved Inspectors etc.) Regulations 2010 (as amended). Intention In the Secretary of State’s view, regulation 25A is met in a new building by analysing the feasibility of installing high-efficiency alternative systems, following Section 3. The Building Regulations do not require that high-efficiency alternative systems or other low or zero carbon systems are installed. 19 Building Regulations 2010 Approved Document L Volume 2, 2021 edition O N L I N E V E R S I O N