| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a hot water storage type water heater provided with a function for preventing shortage of a heat storage amount when a temperature changes rapidly on a daily basis, poor usability caused by an excessive heat storage amount, and waste of an electric power charge. <P>SOLUTION: In storing heat in midnight hours by operating a heat pump unit 2, heat amounts of a previous few days used in supplying hot water are averaged,αas a positive or negative value is added to it to obtain a hot water supply predicted heat amount predicted to be used for hot water supply in a day after boiling. Heat amounts of the previous few days used for heating are averaged, and alsoβas the positive or negative value is added to it to obtain a heating predicted heat amount predicted to be used in heating in the day after boiling. A heat amount that is a sum of them is calculated as a target heat storage amount to be stored in the midnight, and hot water in a hot water storage tank is boiled so as to obtain the target heat storage amount. The values ofαandβare determined on the basis of an average outside temperature of the previous few days, and previously stored temperature changes in a day of the day before. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
