BEAM Plus New Buildings

216 / 248

BEAM PLUS FOR NEW B UILDINGS APPENDICES
V ERSION 1.2 8.1 ANNUAL ENERGY USE
Copyright © 2012 BEAM Society Limited. All rights reserved.
A - 2
8.1 ANNUAL ENERGY
USE
8.1.1 ASSESSMENT FRAMEWORK
8.1.2
8.1.3
8.1.4
8.1.5 SIMULATION REQUIREMENTS
8.1.6
8.1.7 EXCEPTIONAL CALCULATION METHODS
8.1.1 ASSESSMENT
FRAMEWORK
The assessment framework described herein applies to all types of new
building developments:
 those that are air-conditioned throughout the year, including
standalone buildings accommodating a single type or a mix of
premises;
 buildings/premises in the same development served by a central air-
conditioning plant; and
 buildings/premises that also utilise natural ventilation.
8.1.2 PERFORMANCE-BASED
APPROACH
Buildings accommodating predominantly air-conditioned premises, such
as malls, offices, hotels and high-rise apartments, are the dominant
electricity consumers in Hong Kong. In order to allow designers flexibility
in achieving the energy performance target for a building development,
the assessment of Annual Energy use is based primarily on the ‘Energy
Budget’ approach, supplemented by a range of basic requirements.
The Code of Practice for Energy Efficiency of Building Services
Installations (BEC) [ 1 ] provides a framework for demonstrating
compliance in which the proposed design has annual energy
consumption no greater than that of a reference case that satisfies the
prescriptive requirements.
The Performance Based Approach described in Section 9 of the Code of
Practice for Energy Efficiency of Building Services Installations is
primarily geared towards demonstrating compliance to performance
requirements in section 5 to 8 of the BEC. A number of important
modifications are listed here for extending the BEC’s Performance Based
Approach for the purpose of quantifying energy reduction as a result of
efficient design.
Energy Reduction Measures Considered for this credit
The major modifications concerns clause 9.5.4.1 in BEC, which states:
In fulfilling clause 9.5.3 (the requirement that the design energy shall not
exceed the energy budget), the increase in design energy as a result of
not satisfying the trade-off allowable requirements in clause 9.4.2
(performance requirements for lighting, air-conditioning, lift and
escalators, electrical installations) of BEC, can be off-set with reduction
in design energy as a result of –
(a) An improvement over the corresponding minimum allowable levels
of performance in any one or more of the items listed with energy
efficiency requirements in Sections 5 to 8 of the Code (lighting, A/C,
vertical transport and electrical), [This clause effectively limits the
baseline A/C system to be the same as the proposed system with
the same components (albeit with minimum performance
requirements). For example: both baseline and designed building will
have VAV, though the designed building can have better fan
1 Electrical and Mechanical Services Department - Code of Practice for Energy Efficiency of Building Services Installation
- Section A3.4 2012