| 摘要 |
<p>The pump has first and second circuits assembled in cascade, where the first circuit successively comprises a compressor (1), first heat exchanger (2) i.e. condenser, a second heat exchanger (4) i.e. evapo-condenser, a first expansion valve (5) and a third heat exchanger (6) i.e. evaporator. The second circuit is successively provided with a compressor (7), a first heat exchanger (8) i.e. condenser, an expansion valve (9) and the second heat exchanger. A second expansion valve (3) of the first circuit is arranged between the first and second heat exchangers of the first circuit. The first expansion valve of the first circuit and the expansion valve of the second circuit are electronic or thermostatic expansion valves, and the second expansion valve of the first circuit is an electronically controlled expansion valve. R410A refrigerant is circulated in the first circuit, and 1, 1, 1, 2-tetrafluoroethane (R134a) is circulated in the second circuit.</p> |
