Thailand is tropical. Human thermal comfort and health of Thai
people, therefore, depend on 2 main factors which are difficult to
control. They are air temperature and too high relative humidity.
It is widely known that relative humidity affects the growth and
spreading of bacteria, virus, house dust mite and fungi, especially
in air-conditioned rooms with closed covers or without good ventilation
system. This affects the comfort and health of people living
inside. There are only few results from medical research and the
studies on the development of HVAC system to offer comfort and
health in Thailand. Therefore, ASHRAE standards must be used as
the main basis.
This research was done to study the effects of temperature
and relative humidity on human comfort and health of people
in Thailand for the development of novel air conditioning system
in tropical regions. Then, HVAC system was designed and developed
to create good indoor thermal environment in air-conditioned
rooms in Thailand buildings. The congruence of the experts is
used to comply with the climate and requirements of Thai people.
Delphi technique results in section 1 showed that the experts
agreed on the fact that relative humidity and air temperature affects
thermal comfort and health of human beings. Therefore, in airconditioned
rooms, there should be air temperature and relative
humidity control system to achieve thermal comfort and good
health for the persons inside the room, especially in hospital buildings
because it is good for patients and staff members. Due to the
fact that there are only few studies on thermal environment which