| 摘要 |
A precooled vapor-liquid refrigeration cycle includes a basic vapor-liquid cycle (24) and an auxiliary regenerative vapor-liquid cycle (26) having a heat exchange relationship (18') between them. The basic cycle (24) includes a compressor (10) connected in series with a condenser (12), throttle device (14), and evaporator (16). The auxiliary cycle (26) includes a compressor (10'), condenser (12'), throttle device (14'), and a counterflow heat exchanger (18'), successively connected. The cycles each have condensers (12, 12') that are cooled by ambient air; the basic cycle is able to operate independently of the auxiliary cycle. To maximize the coefficient of performance, the basic cycle (24) operates with a small pressure differential between compressor discharge (G) and return (f). Efficiency of the basic cycle and the system COP are improved. The refrigerant leaving the condenser (12') in auxiliary cycle (26) after passing through the auxiliary throttle device (14'), flows through the heat exchanger (18') in the counterflow arrangement with the very same refrigerant stream.
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