A roof is one of the most important characteristics of Thai architecture especially in a house, traditionally. Also, the roof is a part of the house that mainly effects energy saving due to heat allowance pass through and release from indoor space. The study, based on model experiments, targets to find out the effects of roof forms on indoor air temperature. The purpose is to give information for roof form types selection in Thai Houses. Models, l×l×l meter boxes, are used for the experiments by changing their roof forms for comparison. Four types of roof forms, typically used in Thai houses, are selected for the experiments. Those types are gable roof, hip roof, lean-to roof, and flat roof. Temperatures in the middle of the boxes are recorded for the analyses. The results showed that the temperature in the flat roof box is the highest in the middle of the day. However, it dropped fastest in night-time. During the daytime, temperatures in the box of the other roof forms are not much different, while the temperatures in the gable roof model dropped likely faster than the rest. This study gives information for the users in selecting roof forms for their houses.
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