| 摘要 |
PURPOSE:To enable to perform highly efficient heat collecting operation by a method wherein the frequency conversion of a compressor is made possible by an inverter and the frequency is raised so as to increase the heat collecting capacity per unit time in order to increase the collecting heat amount when the outside temperature is lower during the winter season, while the frequency is lowered in order to reduce the input to the compressor when the outside temperature is higher during the summer season. CONSTITUTION:The frequency conversion of a compressor 1 is made possible by an inverter. During the winter, when the outside temperature sensed by an outside temperature detector 8 is lower than the set temperature T1, which is set by a first temperature setter 9 and is lower than the temperature set by a second temperature setter 10, the frequency of the compressor 1 is raised so as to increase its rotational frequency in order to increase the amount of refrigerant to be delivered and circulated and consequently to increase the heat collecting capacity and water heating capacity. Accordingly, the hot water supplying load can be fully satisfied. On the other hand, when the outside temperature sensed by the outside temperature detector 8 is higher than the set temperature T2 (>T1) set by the second temperature setter 10, the frequency of the compressor 1 is lowered so as to decrease its rotational frequency in order to reduce the amount of refrigerant to be delivered and circulated. As a result, the evaporating temperature of refrigerant is raised and the input to the compressor is reduced, resulting in raising the performance factor of a system. |
