Study on Utilizing the Cooled Soil for Comfort Housing Design in Seasonal Hot-humid Areas

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The objective of this study is to make clear thermal performance of various kinds of the earth-contact houses and the raised-floor houses having a ventilation system combining gable vents in the attic with relief vents beneath the floor. The results are concluded as follows.(1) The envelopes and partitions of the traditional houses in northern Kyushu can be used as available cooling sources in case that they have large heat capacity and are cooled by nocturnal ventilation. It is very cool in the earth room because of soil heat capacity and evaporation at the earth surface.(2) It is important to keep roof insulation, exterior wall openings and solar shading devices. The spaces over the ceiling and beneath the floor function as thermal controling or heat absorbing ones of the dwelling rooms against outside weather conditions.(3) The ground soil in Nansei Islands can not be used as a cooling source because the outdoor air temperature is higher all day long than that in northern Kyushu.(4) The Ondol's structure prevents the ground soil from functioning as a cooling source. and then in Korean traditional houses it is necessary to have the other raised-floor rooms to enhance cross ventilation.(5) As the simulation results, the outer insulated basement wall keeps the dwelling rooms cool in summer and warm in winter. The floor heating and cooling system combining with the earth-contact floor brings comfort indoor temperature in middle season.(6) Air movements and transient room temperatures in a building are simultaneously calculated by the computer simulation program called "PSSP". The PSSP can calculate various types of air movements.