National Calculation Methodology (NCM) - Scottish Government

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Other reference values Table 7: EPC scale and energy labels BER ≤ 0 . 0 ⇒ 0 . 0 7 . 5 15 . 0 22 . 5 30 . 0 37 . 5 45 . 0 52 . 5 60 . 0 70 . 0 80 . 0 90 . 0 100. 0 CarbonNeutral < BER ≤ 7. 5 ⇒ A + < BER ≤ 15. 0 ⇒ A < BER ≤ 22. 5 ⇒ B + < BER ≤ 30. 0 ⇒ B < BER ≤ 37. 5 ⇒ C + < BER ≤ 45. 0 ⇒ C < BER ≤ 52. 5 ⇒ D + < BER ≤ 60. 0 ⇒ D < BER ≤ 70. 0 ⇒ E + < BER ≤ 80. 0 ⇒ E < BER ≤ 90. 0 ⇒ F + < BER ≤ 100. 0 ⇒ F < BER ⇒ G 72. In addition to the building rating, the EPC displays two reference values as follows: a. The potential rating of the actual building had it been built to building regulations standards current at the date of issue of the EPC. b. The potential rating of the actual building if certain cost-effective improvements were applied. Assessors can use the software tool to arrive at that improved rating by implementing their selected cost-effective recommendations into a model of the building and running the calculation again. The value of the improved rating can then be input into the original model of the building in order to appear on the produced EPC. 73. The EPC also displays other information such as, the approximate annual energy use of the building, in kWh/m 2 of floor area, the main heating fuel, the electricity source, the ventilation strategy and the main renewable energy source in the building, if applicable and calculated by the calculation tool. 24
5 Input Data to Approved Tools. 74. This section describes generally applicable approaches to data input and modelling strategies and applies equally to Section 6 compliance and EPCs, and also to the modelling of the actual and notional buildings. Defining internal gains and environmental conditions 75. In order to facilitate estimating energy performance on a consistent basis, a key part of the NCM is a set of databases that define the activities in various types of space in different classes of building 21 . One of these standard activities must be assigned to each space in the building 22 . 76. The NCM Activity Database provides standard occupancy, temperature set-points, outdoor air rates, and heat gain profiles for each type of space in the buildings, so that buildings with the same mix of activities will differ only in terms of their geometry, construction, building services and weather location (though in Scotland, a single weather location is identified). Thus, it is possible for the Section 6 compliance checks and EPCs to compare buildings on the basis of their intrinsic potential performance, regardless of how they may actually be used in practice (See Chapter 6 of this guide for more details on the NCM Activity Database). 77. If there is not an activity in the Activity Database that reasonably matches the intended use of a space, then this should be raised with the database managers (through the NCM website) and an appropriate new activity proposed. This will be subject to peer review prior to formal acceptance into the database. Note that it is not acceptable for users to define and use their own activities. Consistent and auditable activity schedules are an important element of the compliance and certification processes and so only approved activity definitions can be used for these purposes 23 . If a special use space is present in the actual building, and no appropriate activity is available in the database, it is accepted that time pressures may preclude waiting for the specific activity definition to be developed, peer reviewed and approved. In such situations, the assessor must use their technical expertise or seek guidance from appropriate sources in order to select the closest match from the approved database. 21 The NCM databases can be downloaded from the NCM website at http://www.2010ncm.bre.co.uk. 22 In a school, these activities might be teaching classrooms, science laboratories, a gymnasium, eating areas, food preparation, staff room, circulation spaces or toilets. The parameter values vary between building types, for e.g., offices in schools are not the same as those in office buildings. 23 Clearly designers may wish to use alternative bespoke schedules for particular design assessments, but these exist outside the compliance/certification framework. 25
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 and 22: Table 6: Carbon dioxide emission fa
Page 23: 4 Energy Performance Certificates (
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

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