Dehumidification Becomes Important for A Building Having Thick Htermal Insulation

摘要

As the sensible heat gain or cooling load are decreased by using thick thermal insulation in a builidng, the need for dehumidification increases .Especialy in Kushiro, it is rather cool and humid in summer because of its foggy weather. In this stuyd, two types of dehumidification systems were developed and their perfomrances were examined. The first is a heat-recovery type, which uses a coling coil and a sensible heat exchanger. The second is a mositure-absorbent type, whihc uses heating and coolign coils and an absobent. Remarkable improvements in dehumidificaion were obtained using the first type of dehumidification system. Using the second type of system, although the termperature of the outlet air rose slightly, both the absolute and relative humidity deceased remarkably. These features are desirable for a city such as Kushiro, in whihc the climate in summer does not necessitate much cooling of inlet air as is the function of an ordinary air conditioner. The moisture-absorbent type makes the most effective use of the coolign power for dhumidification of the three types. The result also showwed that dehumidification is indispensable for thick thermal insulation, indcating that thick thermal insulatin should be a key factor in passive and low energy architecture.