| 摘要 |
<p>An absorption heat pump system comprises an absorber 1, a generator 2, a condenser 5, an evaporator 7, and a pump assembly 4 for pumping liquid (absorbent with absorbed refrigerant) from the absorber 1 to the generator 2. The pump 4 is driven by fluid from the generator 2 which is then passed to the absorber 1 and which comprises the liquid (absorbent depleted of refrigerant) which is conventionally returned to the absorber and, under certain circumstances, vapour from the generator to balance the flow of liquid between the absorber and the generator.</p><p>The driving chamber 17 of the pump assembly 4 is separated into two parts 17a, 17b, the lower part 17a is connected to the liquid space of the generator for receiving liquid therefrom via solenoid valve 26, and the upper part 17b is connectable either to the liquid space of the generator, via valves 31 and 26, or to the vapour space of the generator, via valve 27, both chamber parts being exhausted to the absorber 1 via valve 23. The valves 23, 26, 27 and 31 are controlled by a controller 39 which is connected to a liquid level sensor 40 to alternate the supply of liquid and vapour to chamber part 17b in dependence on the level of liquid.</p> |
