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

R24-27C O N L I N E V E R S I O N NOTE: When calculating the building primary energy rate and building emission rate for a building connected to an existing district heat network, the calculation should not include the effect of any change in heat sources after the buildings are connected. g. The building primary energy rate and building emission rate submission should be accompanied by a report, signed by a suitably qualified person, detailing how the CO emission factors and 2 primary energy factors have been derived. The primary energy factor for the heat output should be taken as: 1/H � (F � PE – E � PE ) F E where: H is the useful heat (excluding heat rejected) in kWh F is the fuel input in kWh PE is the primary energy factor for the input fuel in kWh /kWh F PE E is the electricity production from the scheme in kWh PE is the primary energy factor for district heat CHP generated electricity in kWh /kWh. E PE The CO emission factor for the heat output should be taken as: 2 1/H � (F � CO – E � CO ) 2F 2E where: H is the useful heat (excluding heat rejected) in kWh F is the fuel input in kWh CO is the emission factor for the input fuel in kgCO /kWh 2F 2 E is the electricity production from the scheme in kWh CO is the emission factor for district heat CHP generated electricity in kgCO /kWh. 2E 2 NOTE: See the National Calculation Methodology Modelling Guide for further information. NOTE: The same CO emission factors used to calculate the building emission rate for buildings 2 connected to a district heat network or community heating system should be used to check against the minimum performance standards described in Section 6 of this approved document. Management and control features in the building primary energy rate and the building emission rate calculations 2.8 Where enhanced management and control features are provided in the building, the building primary energy rate and building emission rate can be reduced. This is done by applying the appropriate factor given in Table 2.1 to both of the following, for the system(s) to which the feature is being applied. a. The CO emissions. 2 b. The primary energy. NOTE: For example, if the CO emissions due to electrical energy consumption were 70kgCO / 2 2 (m2·year) without power factor correction, the provision of correction equipment to achieve a power factor of 0.95 would enable the building emission rate to be reduced by 70 � 0.025 = 1.75kgCO /(m2·year). 2 12 Approved Document L Volume 2, 2021 edition Building Regulations 2010 O N L I N E V E R S I O N