| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a solar water heater capable of accurately displaying a change in the intensity of solar radiation, and being manufactured at a low cost by a simple configuration. <P>SOLUTION: A control part 28 includes a heat collector 12, a hot water storage tank 14, a circulation circuit 16 for internally circulating a heating medium, a pump 18 which forcedly circulates the heating medium in the circulation circuit 16, a solar battery 20 which supplies the driving power of the pump 18, a display device 22, and temperature sensors 24 and 26 for measuring temperatures on the heat collector 12 side and the hot water storage tank 14 side to control the on/off-operation of the pump 18 and the display of the display device 22. First display control is performed which turns on the pump 18 when a temperature difference is larger than a set value to cause the display device 22 to display an output voltage of the solar battery 20, and second display control which repeats the alteration of on/off-operation of the pump 18 when the temperature difference is smaller than the set value with a predetermined time interval, and causes the display device 22 to display an output voltage of the solar battery 20 during an on-state. <P>COPYRIGHT: (C)2012,JPO&INPIT |
