Thailand and brain drainElectricity consumption in Thailand is approximately
44%, 24% and 23% of the total electricity use for industrial,
commercial and residential sectors, respectively [1].
For residential buildings in urban and suburban areas,
air-conditioning is also widely used approximately 70%
of the total energy use. Webb (1952) pioneered thermal
studies in Singapore for humid tropical regions [2].
Busch (1990) studied on field experiment in naturally
ventilated office buildings in Bangkok, Thailand indicated
a neutrality of 28.5˚C ET, while 24.5˚C ET was
observed in air-conditioned buildings [3]. Neutral temperature
for office workers was 26.7˚C in Jakarta, Indonesia
[4]. The use of radiant cooling system was suggested
to offer quiet comfort and energy efficiency superior
to conventional air-conditioning system [5]. Zones of
acceptable operative temperature and humidity for people
with light activity were developed by ASHRAE. The
lower limit of ET for winter and the upper limit of ET for
summer are 20˚C and 26˚C [6]. In the previous studies,