England Building Regulations Part L 2021
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A Building rating document is automatically produced
and this document is displayed. The document provides access to various key
calculation results including the following.
- The energy used per
square meter (kWh/m2) by the actual and notional buildings for heating,
cooling, auxiliary energy uses (pumps and fans), lighting and domestic hot
water.
- The resulting CO2
emissions (kgCO2/m2) from the actual and notional buildings.
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CO2 emissions and primary energy mandatory
requirement
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Carbon dioxide emissions for the actual building
(BER) is computed by SBEM. A notional building is automatically constructed
using the actual building data and limiting U values and glazed areas, as
defined in PartL. The carbon dioxide emission for the notional building is
computed by SBEM. Two factors, the Improvement factor and the LZC factor are
computed by SBEM and applied to the notional building emission to give a target
emission rate (TER). The computed building emission rate (BER) must be less
than or equal to the Target emission rate (TER) for CO2 emission compliance.
U values – A check is made by
SBEM to see if the fabric U values specified for the project are within the
limiting U values in PartL Table 4, for both individual element U values and
area-weighted average U values.
Solar gains - A calculation
is carried out for each room, to check if the solar and internal casual gains
(people, lighting and equipment), averaged over the period of daily occupancy,
does not exceed 35 W/m2. Solar irradiances for July in table 2.24 (CIBSE A
1999) are used for this check.
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