| 摘要 |
<P>PROBLEM TO BE SOLVED: To efficiently perform heat collection operation in operating a heat collector. <P>SOLUTION: A heat collector to collect solar heat with a solar light receiving surface and a hot water storage are thermally connected via a liquid circulation passage. When a liquid circulation pump 5 is operated, heat collection operation is performed, where the liquid circulating in the liquid circulation passage exchanges heat with hot water in the hot water storage to heat the hot water in the hot water storage. When heat collection operation begins after a predetermined time has elapsed since the stop of the previous heat collection operation and the on/off frequency of the liquid circulation pump 5 detected by a pump on/off frequency detecting means 44 reaches or exceeds a preset frequency, a steam blowoff control means 45 keeps the liquid circulation pump 5 suspended for a while until a predetermined standby time elapses, and gathers the steam in the heat collector toward the liquid discharge outlet side of an internal liquid passage in the heat collector, and then restarts the liquid circulating pump after the predetermined standby time elapses to perform the steam blowoff by discharging the steam in the heat collector to the outside from the liquid discharge outlet side of the heat collector with a preset frequency or more. <P>COPYRIGHT: (C)2013,JPO&INPIT |
