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

L1(b), L2 O N L I N E V E R S I O N 5.15 It may be justified to control a heating zone rather than individual rooms in either of the following cases. a. In open-plan spaces in which heating demand and patterns of use are similar across the whole space, sub-zoning of temperature control might not be appropriate. In such cases, the space should be considered as a single heating zone. b. Where two adjacent rooms have a similar function and heating or cooling requirements (e.g. kitchen and utility room). In such cases, the adjacent rooms should be considered as a single heating zone. NOTE: Exhaust air heat pump systems, which extract heat from the exhaust air of a building, may not need to provide independent thermostatic control to individual rooms. Providing room/ zone control on this type of system is unlikely to be economically and/or technically viable. However, other space heating systems also in use in the same building should be controlled using thermostatic room controls as described above. 5.16 The standards in paragraphs 5.14 and 5.15 may be satisfied by providing any of the following. a. Both of the following. i. A thermostat in a room that the heating or cooling circuit serves. ii. An individual thermostatic room control for each emitter, such as a thermostatic radiator valve, on all emitters outside the room that contains the thermostat. Thermostatic radiator valves should not be used in the same room as the thermostat. b. An individual room/heating zone thermostat or fan coil thermostat for each room or heating zone. c. An individual networked heating or cooling emitter control for each emitter. Energy submeters 5.17 Energy submetering systems should be installed in new buildings, or when fixed building services are provided or extended in an existing building, and should meet all of the following requirements. a. The various end-use categories, such as heating, lighting and cooling, should be submetered in such a way that at least 90% of the annual energy consumption of each fuel can be assigned to an end-use. Detailed guidance on how to achieve this is given in CIBSE’s TM39. b. Metering should enable the comparison of forecast energy use and in-performance energy and facilitate energy reporting. This can be demonstrated by basing the submetering strategy on a design-stage energy forecast for the building, using one of the methodologies in paragraph 9.4. c. Metering should allow the energy use of different tenants within the building to be separately monitored. d. The outputs of any renewable systems should be separately monitored. e. In buildings with a total useful floor area greater than 1000m2, automatic meter reading and data collection facilities should be installed. 38 Approved Document L Volume 2, 2021 edition Building Regulations 2010 O N L I N E V E R S I O N