| 摘要 |
<p>PURPOSE:To let a variable displacement pump with a small controlling range of rotational frequency make realize a large controlling range of flow rate and consequently keep heating up temperature constant by a structure wherein the variable displacement pump and a piping throttling mechanism are provided in a liquid pipe line led to the liquid heating type heat exchanger of a heat pump heating unit. CONSTITUTION:The heat pump heating unit 1 consists of a compressor 2, the liquid heating type heat exchanger 3, a heat source side heat exchanger 4 and a throttling mechanism 5. The variable displacement pump 10 and the piping throttling mechanism 11 are provided in the piping, which connects said liquid heating heat exchanger 3 with a hot water storage tank 7, and the rotational frequency of the variable displacement pump 10 is controlled by the output of a detecting unit 13, which detects the temperature of the hot water leaving the liquid heating type heat exchanger 3 and yet the amount of throttlig of the piping throttling mechanism 11 is controlled by the output of a flow rate detecting unit 14.</p> |
