National Calculation Methodology (NCM) - Scottish Government

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(uninstalled) services should be defined at zone level by identifying whether the zone is a fit-out area (approved software tools must allow for this identification). iSBEM enables this by providing a tickbox within the Geometry/Zones tab if ‘shell building’ is selected under ‘S6 type of building’. 63. Energy associated to HVAC, lighting and HW systems serving 'fit-out' zones will be accounted for as normal in the calculation, which will assume that fit-out services are fully operational, designated temperatures are maintained, lighting and hot water provided in all zones. That means the boundary conditions between zones are unaffected. The calculation for the notional building is unaffected by this process. 64. These procedures only apply to compliance with standard 6.1. EPC generation is still required for such a building, when fitted out. Extensions to the Insulation Envelope 65. For extensions to the insulation envelope, the new building fabric should be designed to comply with the limiting standards specified in clause 6.2.11 of Section 6. There are two ways to assess an extension by use of iSBEM: It is possible to assess the extension in isolation from the existing building, or alternatively assess the entire building as extended. Both these approaches are compatible with iSBEM. 22
4 Energy Performance Certificates (EPCs). 66. Energy Performance Certificates (EPCs) provide prospective buyers/tenants with information about the energy performance of a building and practical advice on improving performance. Cost effective recommendations for improving the energy performance of the building detailed on the certificate must meet the Scottish building regulations, be specific to the individual building and be technically feasible. The EPC displays the “rating” of a building in the form of the approximate annual Building CO2 Emission Rate (BER) in kg per m 2 of floor area per year, rated on a seven band scale (see clause 6.9.2 of Section 6). 67. While an EPC is not required for permanently unconditioned buildings (i.e. buildings which do not use energy to condition the indoor climate and are expected to remain this way), it is possible to voluntarily produce EPCs for unconditioned buildings. Permanently unconditioned buildings are different to those which are currently unconditioned but are intended to be conditioned prior to occupation, and which should be modelled as per the guidance on shell and fit out buildings in Section 6. Further guidance on EPCs is provided in the BSD website 19 . 68. The EPC ‘A to G’ scale and energy labels corresponding to values of the BER are displayed in, with “Carbon Neutral” being the most efficient (followed by “A+”) and “G” being the least efficient. This is a seven band graphical scale where a letter rating or letter plus rating are shown on the same band. 69. The EPC is accompanied by a “Recommendations Report”, which contains a list of NCM recommendations, edited and added to by the assessor, for the improvement of the energy performance of the building and their respective potential impact on the CO2 emission rate of the building. The recommendations are grouped into the following sub-sections in the report: short payback (up to 15 recommendations), medium payback (up to 10 recommendations), long payback (up to 5 recommendations), and other recommendations created by the assessor (up to 10 recommendations). 70. The EPC itself displays the top 6 of the short payback (i.e. three years or less) NCM recommendations. If there are user-defined or user-edited recommendations, then the EPC displays the top 3 NCM cost effective recommendations with a payback period of three years or less and up to 3 user recommendations with the shortest payback. 71. The impact of the recommendations on the CO2 emission rate of the building and their estimated payback 20 is assessed based on the energy performance of the actual and notional buildings. 19 http://www.scotland.gov.uk/Topics/Built-Environment/Building/Building-standards/publications/pubepc 20 Details of the logic used for generating the NCM recommendations, their impacts, and paybacks are in the SBEM Technical Manual available from the NCM website at www.2010ncm.bre.co.uk. 23
Page 1 and 2: Directorate for the Built Environme
Page 3 and 4: Contents. Contents 3 List of Tables
Page 5 and 6: BER Building Emission Rate BSD Buil
Page 7 and 8: 2 Approved Software Tools. 5. Non-d
Page 9 and 10: of building or building features. T
Page 11 and 12: Building Fabric 26. The U-values in
Page 13 and 14: Methods that use flow networks are
Page 15 and 16: egarded as being mechanically venti
Page 17 and 18: d. The electricity used by fossil-f
Page 19 and 20: . For other spaces, divide the illu
Page 21: Table 6: Carbon dioxide emission fa
Page 25 and 26: 5 Input Data to Approved Tools. 74.
Page 27 and 28: d. Any fuel used in generating the
Page 29 and 30: Table 8: Measurement and other conv
Page 31 and 32: pressure filtration is also defined
Page 33 and 34: Building Type Description 16 Non-re
Page 35 and 36: Activity Type Description 33 Generi
Page 37 and 38: Construction and Glazing Databases
Page 39 and 40: ID Category Construction Name 518 P
Page 41 and 42: ID Category Construction Name 565 P
Page 43 and 44: 101. It may also be that more compl

National Calculation Methodology (NCM) - Scottish Government

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