Thailand, a non-oil production country is crucially aware of energy problems. Energy used in buildings is one of the country's highest energy consumption. It is mainly for maintaining an indoor thermal comfort which is by means of air-conditioning.
The purpose of the research is to study and research climate data and to define thermal comfort for the Bangkok Metropolitan area. Suitable data of climatic and comfort conditions will help provide solutions to problems of designing buildings that efficiently conserve energy while ensuring thermal comfort condition.
Field studies of Bangkok climate were conducted to establish the dissimilarity between locally measured and published Meteorological values i.e. to establish the extent of an urban heat island effect. The results well illustrate that the measured values of average 1.4 and 1.8 degree C higher than the Meteorological values in summer season and winter season.
The process of defining the range of thermal comfort was principally by field studies and information from questionnaires administered to 1377 people of a wide range of ages. The results showed the neutral temperature for naturally ventilated buildings to be 28 °C and for air conditioning building to be 25 ac (for summer).
The results from the field studies are used for building thermal simulation studies for free running multistorey residential buildings. Extensive simulation studies are presented using Tas, the software package for thermal analysis of buildings. Meteorological data modified by values from the field measurements and building material data defined from local sources are used as database for the simulation. The Bangkok neutral temperature from the field study is used to define the overheated condition and periods.
The simulation results present the dissimilarity of thermal performance and thermal behaviour of N-S facing of double loaded (DBC) and single loaded corridor (SLC) buildings. First floor (first floor of elevated floor building) of both DBC and SLC buildings demonstrate the worst performance, which cannot fully overcome the summer overheating even applying with 2m/s air movement generated by electric fan. The windward zones (WW) of second floor level and above of DBC buildings show satisfactory performance but not in the leeward (LW) zones. SLC buildings from second floor up present the best performance which follows closely to the outdoor condition all year round.
It was concluded that SLC buildings are the most appropriate free-running multistorey residential building in Bangkok. Some recommendation and further studies are proposed to assist in modification of double loaded corridor (DBC) buildings.