PURPOSE: To prevent deterioration of the heat-storing material by shutting out hot air, when the temperature rises upstream in two hot air-circulating ducts in one of which is provided a heat storage tank filled with latest heat- storing material from the duct with the heat storage tank by means of a damper.
CONSTITUTION: In the hot air-circulating duct 2 in the main body 1 of a hot air heater there is provided a partition 3 which divides the hot air-circulating duct 2 into two ducts. A heat storage tank 4 placed in one of the two hot air-circulating ducts 2a is filled with latent heat-storing material 5 in a stabilized supercooled state. At an upstream position of the partition 3 there is provided a switching damper 8 which closes either of the two circulating ducts 2a, 2b at the upstream position and shuts out hot air therefrom. When the temperature of the heat storage tank 4 sharply rises over a specified point during the operation of the hot air heater, the switching damper 8 closes the circulating duct 2a with the heat storage tank 4, passing the hot air through the other circulating duct 2b, so that the latent heat-storing material 5 in the heat storage tank 4 is not overheated.
SAITO KAZUO
KASHIMA KOJI
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