Abstract
Recent pervation of the residential central space heating is remarkable. This is supported by remarkable incleasing of national income and recognition about improvement of living environments which are compared with air conditioned environ-ments in general office buildings.At the begining, this paper explains on the residential central space heating as compared with inddividual space heating and district heating. See Table 1 and Fig.3.The residential central heating systems are classified into three groups by heat medium for space heating. Those are all-air system (warm air heating system), all-water system (hot water heating system) and air-water system (fan coil unit and supplementary hot air). A air-water system is too complicate to residence use, so it is scarcely used.All the system has a boiler or a hot air furnace or a heat pump as heat producing equipment. A boiler and hot air furnace is selected frequently, but a heat pump system is scarcely selected. Because initial cost of a heat pump system for heating only is comparatively high-priced, but for yearound air conditioning competes with other systemsin initial cost.Moreover this paper shows, there are some problems awaiting solution about system planning and designing. For instance one of the problems is usage of a domestic hot water supply system or a summer cooling system together with a heating system itself.
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