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

AA O N L I N E V E R S I O N Luminaire lumens Equal to (light source lumens Modulating burner control A type of boiler � light output ratio) and represents the output of control that provides a continuously variable firing the luminaire. Light output ratio (LOR) is the ratio rate that is altered to match the boiler load over of the output of the luminaire at stated practical the whole turndown ratio. conditions to that of the lamp(s) contained in the Optimum start A control system or algorithm that luminaire under reference conditions. starts plant operating at the latest time possible *Major renovation Defined in regulation 35 as to achieve specified conditions at the start of the the renovation of a building where more than occupancy period. 25% of the surface area of the building envelope Optimum stop A control system or algorithm that undergoes renovation. stops plant operating at the earliest time possible *Material change of use Defined in regulation 5 as: so that internal conditions will not deteriorate Where there is a change in the purposes for which beyond present limits by the end of the occupancy or the circumstances in which a building is used, so period. that after that change: Part load energy efficiency ratio A ratio calculated a. the building is used as a dwelling, where by dividing the cooling energy delivered into previously it was not; the cooling system by the energy input to the cooling plant. Part load performance for individual b. the building contains a flat, where previously it chillers is determined assuming that chilled water did not; is provided at 7°C out and 12°C in (at 100% load), c. the building is used as an hotel or a boarding under the conditions detailed in Table A2. house, where previously it was not; d. the building is used as an institution, where Table A2 P artial load efficiency ratio previously it was not; Percentage part load 25% 50% 75% 100% e. the building is used as a public building, where previously it was not; Air-cooled chiller’s 20 25 30 35 ambient air temperature f. the building is not a building described in (°C) classes 1 to 6 in Schedule 2, where previously it Water-cooled chiller’s 18 22 26 30 was; entering cooling water temperature (°C) g. the building, which contains at least one dwelling, contains a greater or lesser number of Point-of-use electrically heated A domestic hot dwellings than it did previously; water system in which the water is supplied to h. the building contains a room for residential the draw-off points from a device in which water purposes, where previously it did not; is heated by an electric element or elements i. the building, which contains at least one room immersed in the stored water. The water heater for residential purposes, contains a greater is close to the draw-off points and has a storage or lesser number of such rooms than it did capacity no greater than 100 litres. previously; Power efficiency The total annual power output of j. the building is used as a shop, where it a CHP unit divided by its total annual fuel input. previously was not; or Primary energy Energy, from renewable and non- k. the building is a building described in regulation renewable sources, that has not undergone any 7(4)(a), where previously it was not. conversion or transformation process. 8888 AApppprroovveedd DDooccuummeenntt LL VVoolluummee 22,, 22002211 eeddiittiioonn BBuuiillddiinngg RReegguullaattiioonnss 22001100 O N L I N E V E R S I O N