| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a solar heat water heater featuring a simple configuration, a low device cost, a capability for collecting heat collection efficiently, and a safety consideration for human body and to solve the problems attributable to a conventional antifreeze heat transfer liquid circulation type solar heat water heater. <P>SOLUTION: A solar heat collector 10 is of heat pipe type using a vacuum glass tube. If the solar heat collector 10 is cooled by cold open air in winter and a high-temperature sensor 12 reaches a preset temperature which may cause freezing, a controller 15 performs a freezing prevention operation by driving a circulation pump 11. <P>COPYRIGHT: (C)2013,JPO&INPIT |
