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BEAM PLUS FOR NEW B UILDINGS APPENDICES
V ERSION 1.2 8.8 PASSIVE DESIGN ASSESSMENT METHODOLOGY
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areas is as per CIBSE Applications Manual AM10: 2005[6].
 The simulation shall identify the AAWV from each habitable area under
each wind direction.
 Internal doors within a unit are assumed to be fully opened.
 Entrance doors that connect to the common area within the building (e.g. lift
lobbies) are assumed to be fully closed.
 A habitable room is deemed to have satisfied the requirements if the AAWV
is not less than 0.4m/s for any one of the four wind direction.
 All habitable rooms are calculated separately.
 Find out the percentage area of spaces which satisfy the AAWV
requirements based on total habitable area in the building.
Note 1: If the building is designed without internal partitions, the designer must
include a reasonable number of partitions to represent typical occupancy.
8.8.1.5 Daylight Natural daylight can provide adequate light for buildings for a large proportion
of the year. This saves the energy use associated with artificial lighting.
BD APP-130[7] sets out a methodology for calculating vertical daylight factors
(VDFs) and requires a minimum factor of 8% for habitable areas and 4% for
kitchens.
This credit can be achieved if this criteria is exceeded by 50% (i.e. VDF >12%)
for 80% of the habitable rooms & >6% for 80% of kitchens.
Note: The 80% is calculated by area.
8.8.2 Active Building
System
The developer will still be responsible for some active systems within the
development. This section ensures that the selection of these ensures efficient
operation.
The following requirements must be achieved:
Two pre-requisites must be achieved to gain the credits:
1. Compliance with the latest Building Energy Codes (BEC) by the
prescriptive option; and
2. In the case where air-conditioning units are provided by the developer,
units selected shall either be Grade 1 or 2 under the Government’s Energy
Efficiency Labelling Scheme for room coolers.[8]
Three different categories fall under the section for Active Building Systems,
1. HVAC in common areas.
2. Artificial lighting systems in common areas.
6 CIBSE Applications Manual AM10: 2005
7 Buildings Department - PNAPP-130 - Lighting and Ventilation Requirements – Performance-based Approach
8 HKSAR Government - CAP 59