Page 128 - Hong Kong Green School Guide

3. Green School Guide - 3.5 Indoor Environmental Quality

Hong Kong Green School Guide

126

• The following measures can be implemented in new school development to

improve thermal comfort (sorted by priority):

- - Incorporate climate positive design described in various sections in this

Guide (e.g. building orientation, natural ventilation, shading, glass type,

etc.);

- - Increase air ventilation with the help of ceiling / wall mounted fans;

- - Select high energy efficient air conditioning with sufficient cooling capacity

as described in Air Conditioning Unit section in this Guide; and

- - Climate positive and active design (fan and air conditioning) shall be

evaluated together as these designs can impact not only the thermal

comfort of occupants, but also daylight access, natural ventilation, heat

gain and capacity of air conditioning. Please consult Authorised Person

(AP), Registered Professional Engineer (RPE) in Building Services

Discipline and BEAM Professional for detailed evaluation.

• Existing schools can implement the following measures to improve thermal

comfort (sorted by priority):

- - Relaxed dress code for staff and provision of flexible options for students

to choose summer / winter school uniform between seasons;

- - Increase air ventilation with the help of ceiling / wall mounted fans, also

help decrease the demand for air conditioning; and

- - Incorporate climate positive design described in various sections in this

Guide (e.g. internal shading, window film, double pane glass, etc.).

d. Professional Help

• Authorised Person (AP) – Appendix A (2)

• Registered Professional Engineer (RPE) in Building Services Discipline –

Appendix A (4)

• BEAM Professional – Appendix A (7)

e. Suggestion

Indoor temperature and relative humidity provided below for respective functional

areas are considered to be comfortable for most occupants in summer, and

hence can act as a reference for schools adjusting the air conditioning during

hot season:

Functional Area Indoor

Temperature (

O

C)

Relative Humidity

(%)

Air Speed (m/s)

Classroom

25

O

C ~ 28

O

C

<70%

0~1.5m/s (no

noticeable wind)

Hall – Light Activity 21

O

C ~ 23

O

C

<70%

Indoor Sport Hall

21

O

C ~ 23

O

C

<80%

With the help of ceiling / wall mounted fans and/or natural ventilation through

opening windows when ambient environment is appropriate (i.e. sufficient

wind and low ambient noise), higher temperature and relative humidity can be

allowed: