This paper presents the benefit of natural ventilation of a roof cavity to reduce summer thermal loads ofa factory and, therefore, the cooling load due to air-conditioning systems with respect to various climatezones in Japan. A simulation program was developed to analyze the impact of cavity ventilation on theoperative temperatures of the occupied zones in a factory. Three climate zones in Japan: cold region(Sapporo), temperate hot-humid region (Tokyo), and subtropical region (Naha) were selected forcomparison. In an air-conditioning mode, two calculations of cooling loads were made.
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