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BEAM P
LUS FOR
E
XISTING
B
UILDINGS
A
PPENDICES
V
ERSION
1.2
8.1 A
NNUAL
E
NERGY
U
SE
Copyright © 2012 BEAM Society Limited. All rights reserved.
A - 8
following features:-
The use of a computer-based hour-by-hour, full-year, multiple-
zone numerical analysis for modelling and simulating the design
energy and energy budget is required.
The simulation program should be capable of modeling and
simulating the thermal behaviour of a building and the interaction
of its building fabric, air-conditioning, lighting and other relevant
energy consuming equipment and systems.
The simulation program should be capable of performing design
load calculations to determine the required air-conditioning
equipment capacities and air and water flow rates for both the
designed building and reference building.
The simulation program should be able to deliver the following
printouts:-
(a) breakdown of energy consumption for lighting installation,
space cooling and heat rejection equipment, space heating
(if provided), fans of AHUs and ventilation fans, pumps for
air-conditioning, service water heating equipment,
miscellaneous, equipment/appliance loads (e.g. office
equipment); and
(b) monthly building energy consumption profile.
The functions and capabilities of the selected simulation program should
be stated clearly in the energy assessment submission.
Alternatively, the computer simulation requirements shall be referred to
section G2 – Simulation General Requirements in ASHRAE Standard
90.1-2007 Energy Standard for Buildings Except Low-Rise Residential
Buildings when ASHRAE approach adopted,
8.1.5 ASHRAE A
PPROACH
ASHRAE Standard 90.1-2007 Energy Standard for Buildings Except
Low-Rise Residential Buildings is to provide minimum requirements for
the energy-efficient design of buildings except low-rise residential
buildings.
Appendix G
of ASHRAE 90.1-2007 provides the alternative
approach, which is intended for use in rating the energy efficiency of
building designs that exceed the requirement of Section 11 of the
ASHRAE standard 90.1-2007. It may be useful for evaluating the
performance of all proposed designs, including alterations and additions
to existing buildings, except designs with no mechanical systems. The
detailed requirement, assumption and modeling methodology for
calculating the proposed and baseline building performance shall be
made reference to the ASHRAE Standard.
8.1.6 E
XCEPTIONAL
C
ALCULATION
M
ETHODS
When the selected simulation program cannot adequately model a
design (Note: For example: passive design with significant contribution
on the reduction of CO
2
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 Edition[3] and/or Section G2.5 of
ASHRAE 90.1–2007[ 4 ] and/or Appendix D of the Advanced Energy
Modelling for LEED – Technical Manual v1.0 (September 2011
Edition)[5].
3
EMSD - Code of Practice for Energy Efficiency of Building Services Installation - Section A3.4 2012
4
ASHRAE Standard 90.1-2007 – Energy Standard for Buildings Expect Low Rise Residential Buildings
5
USGBC - Advanced Energy Modeling for LEED – Technical Manual v1.0 (August 2010 Edition).