Abstract
This study aims to investigate the detailed thermal environments in apartments of Surabaya, Indonesia. Major thermal parameters and air tightness were measured in one of the representative units of three types of apartments respectively, under different natural ventilation conditions. The results revealed that the unit in the old public apartment showed better thermal environments under naturally ventilated conditions than those in the others. Thermal comfort can be achieved during most of the day only in the old public apartment under full-day and night ventilation conditions. The air tightness of the unit in the private apartment was relatively high compared to the other units for the use of air-conditioning.
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