Office
UNIT
Solar Control Film
Solar control film is applied
to east and west glass
panes to cut IR and UV rays
and the use of reflective
roller blind reduces the
energy needed for cooling.
Ventilation
Rotating fans are used in some areas to
supplement air conditioning in order to
achieve a more even air distribution so
that the air conditioning set-point can be
raised when room air velocity is high.
Electronic Thermostat
Anelectronic thermostat candisplay
real-time temperatures and allows
a higher degree of individual control
(i.e. a choice between traditional
mode and VAV mode).
Furniture
Back pans of all seats adopt a
perforated design to facilitate
heat dissipation from the
human body, thus enabling
a higher air conditioning set-
point to be set.
Zoning
Thermostats are placed in
each zone to allow users to set
the temperature. Installation
of lighting zones and air
conditioning zones with easily
accessible switches for the
office provide lighting and air
conditioning onlywhen required
in the occupied areas, instead of
the entire office.
Passive
design:
Heat
gain
reduction
Figure 3.2.1 Illustration of the effect of solar control film and reflective
roller blind
(Source: Hong Kong Green Building Council)
Figure 3.2.2 Furniture that facilitate thermal comfort
(Source: Hong Kong Green Building Council)
Figure 3.2.3 Rotating Fans
(Source: Hong Kong Green Building Council)
Figure 3.2.4 Electronic thermostat for
individual control
(Source: Hong Kong Green Building Council)
Figure 3.2.5 Lighting zone of the Hong Kong Green Building Council office
(Source: Hong Kong Green Building Council)
Benefits for Office Building
Well functioning and adequate
ventilation in buildings is necessary
to ensure that indoor air is free
from pollutants, and that indoor
temperatures and moisture levels are
sufficiently regulated.
Benefits for Office Unit
Concentrations of pollutants found
indoors are much higher than those
outside and are known to have a
significant impact on health. Increased
ventilation above the minimum
standards improves the indoor air
quality (IAQ) and benefits occupants’
health and well-being directly.
z
Schedule regular maintenance
of clean air conditioner filters
to ensure proper and efficient
operation
z
Mixed mode ventilation system
z
Slide open façade
z
Operable vents on the building
envelope to allow fresh air in
z
Free cooling system
z
Use fans on the wall of each side
of the building to keep fresh air
flowing
z
Proper layout to enhance cross
ventilation
Adequate Ventilation
Overview
The purpose of ventilation is to dilute the level of pollutants in the air.
The rate at which outdoor air replaces indoor air is described as the air
exchange rate. Generally, the air exchange rate is high and indoor air
pollutants are reduced. Although spaces can be ventilated naturally by
opening windows and doors, it is less common in Hong Kong due to the
climate and human factors. However, a mixed mode ventilation that uses
both natural and mechanical ventilation can be adopted.
Everyone working in an indoor environment requires adequate
ventilation to produce a healthy working environment. The basics
of proper ventilation are an abundant supply of fresh air, adequate
circulation of that air and the elimination of temperature fluctuations.
Offices which are poorly
ventilated can have high levels of
biological contaminants arising
from mould growth on damp
surfaces. This poor air quality
adds to the general discomfort
of working in such an office
environment, particularly for
those with allergic conditions.
Green Strategies for Office Building
Office
UNIT
Office
BUILDING
Green Strategies for Office Unit
BEAM Plus NB V1.2 IEQ 9
An outdoor ventilation rate
shall exceed ASHRAE 62.1:2007
requirement by at least 30%.
BEAM Plus BI V1.0 IEQ 3
Carbon dioxide level within the
project space shall comply with
Good Class requirement as
stipulated in IAQ Certification
Scheme.
Figure 3.2.6 Principle of stack effect of a
solar chimney
Figure 3.2.7 Ceiling Fan
)
DESIGN STAGE
3.2.2 Adequate Ventilation
Case study of Hong
Kong Green Building
Council Office:
DESIGN STAGE
3.2.1 Thermal Comfort
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