Based on common studies of thermal comfort, a field
survey was conducted for ‘‘controlled air velocity of a
classroom building’’. Analysis of the data of thermal sensation
votes based on the Predicted Mean Vote method
permits us to develop a ventilation comfort chart under
Bangkok ambient condition. Its main advantage might be
summarized as follows: though developed for non-air-conditioned
conditioned
building, this chart can be used for designing air
ventilation system for both non- and air-conditioned buildings
within the limit of air velocity not over 3 mrs, and
indoor conditions used here, namely, maximum air temperature
of about 36.38C and relative humidity of 50–80%. In
the case of air-conditioned building, increasing indoor air
velocity — not over 1 mrs — would allow to increase the
indoor temperature the relative humidity being relatively
constant at around 50%.. This would decrease the electricity
consumption of the air-condition unit. When no aircondition
unit is used, the electricity consumption of fans
— even with a big number of units, depending on room
size — is still small compared to that of air-conditioned
buildings, leading to a considerable energy saving while
providing reasonable indoor conditions.
Finally, this chart could also be used by surrounding
countries of Thailand which not only have similar ambient
conditions but also have similar social and traditional
norms.