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BEAM PLUS FOR EXISTING BUILDINGS ENERGY USE (E U)
V ERSION 1.2 E U 1 REDUCTION OF CO2 E MISSIONS
Copyright © 2012 BEAM Society Limited. All rights reserved.
Page 70
the Carbon Audit Guideline or default assumptions in Appendix 8.3. Full
building energy simulation including energy used for heating, cooling,
lighting, equipment, small power, etc shall be considered.
The methodology of the energy simulation will make reference to the latest
or Appendix G of ASHRAE 90.1-2007 or
equivalent. (Note: As of interim measure before a Hong Kong equivalent of
Appendix G of ASHRAE 90.1-2007 is available, lighting power density
(LPD) in ASHRAE calculation shall use those parameters in Code of
Practice for Energy Efficiency of Building Services Installation – 2012
Edition). Appendices 8.1 and 8.2 include the assumptions for design
parameters for Performance-based approach for residential and other
building types for reference.
The determination of annual energy use of the Baseline Building model
will be based on the default indoor conditions and occupancy, lighting
and equipment load densities and patterns for the relevant types of
premises in the assessed building, as summarised in Tables 8.3 and 8.4
in Section 8.2. Performance of air-conditioning equipment shall be taken
as being at a level that barely complies with the minimum requirements
stipulated in the Code of Practice for Energy Efficiency of Air
Conditioning Installations [1].
The zero-credit criteria for the annual energy use of the assessed
building shall then be determined by scaling up the annual energy use of
the baseline building model by 150%. Where applicable, the default
values or assumptions for design parameters shall make reference to
Appendix 8.2.
The energy analysis and supporting documentation shall be prepared and
certified by a qualified professional person. The submission for
compliance and the computer software to be used shall make reference to
the latest or ASHRAE Standard 90.1-2007.
When the selected simulation program cannot adequately model a design
(Note: For example: passive design with significant contribution to the
reduction of CO2 emissions), material, or device, the rating authority may
approve an exceptional calculation method to demonstrate above-
standard performance. The exceptional calculation shall make reference
to Section A3.4 of Code of Practice for Energy Efficiency of Building
Services Installation - 2012 Edition2] and/or Appendix G2.5 of ASHRAE
90.1–2007[3] and/or Appendix D of the Advanced Energy Modelling for
LEED – Technical Manual v1.0 (September 2011 Edition)[4].
USE OF REGRESSION
MODELS
For some types of buildings regression models may be used as an
alternative to the generic simulation method, for the determination of the
zero-credit energy use and maximum electricity demand criteria (based
on the baseline building model) for the assessed building.
USE OF ENERGY
CONSUMPTION
INDICATORS AND
BENCHMARKS
The assessment covers all areas, premises and energy uses under the
control of the building management, i.e. the building management is
responsible for energy and fuel bills.
As an alternative to the prescriptive codes for air-conditioning and
lighting [ 5 ] compliance with the Performance-based Building Energy
1 Electrical and Mechanical Services Department. Code of Practice for Energy Efficiency of Air Conditioning Installations
(2007 Edition) and the subsequent amendment
2 EMSD - Code of Practice for Energy Efficiency of Building Services Installation - Section A3.4 2012
3 ASHRAE Standard 90.1-2007 – Energy Standard for Buildings Expect Low Rise Residential Buildings
4 USGBC - Advanced Energy Modeling for LEED – Technical Manual v1.0 (August 2010 Edition).
5 Electrical and Mechanical Services Department. Code of Practice for Energy Efficiency of Lighting Installations (2007
Edition) and the subsequent amendment