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    • 11. 发明授权
    • Precooled vapor-liquid refrigeration cycle
    • 预冷汽液冷冻循环
    • US5729993A
    • 1998-03-24
    • US633150
    • 1996-04-16
    • Mikhail BoiarskiOleg Podcherniaev
    • Mikhail BoiarskiOleg Podcherniaev
    • F25B7/00F25B9/00F25B1/00
    • F25B9/006F25B7/00
    • A precooled vapor-liquid refrigeration cycle includes a basic vapor-liquid cycle and an auxiliary regenerative vapor-liquid cycle having a heat exchange relationship between them. The basic cycle includes a compressor connected in series with a condenser, throttle device, and evaporator. The auxiliary cycle includes a compressor, condenser, throttle device, and a counterflow heat exchanger, successively connected. The cycles each have condensers 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 operates with a small pressure differential between compressor discharge and return. In the heat exchanger, refrigerant flow from the basic cycle condenser is further cooled in a counterflow arrangement by the low temperature refrigerant from the auxiliary cycle until the refrigerant in the basic cycle has been precooled from near ambient temperature to near the intended refrigeration temperature. Efficiency of the basic cycle and the system COP are improved. The refrigerant leaving the condenser in the auxiliary cycle, after passing through the auxiliary throttle device, flows through the heat exchanger in the counterflow arrangement with the very same refrigerant stream. The basic vapor-liquid cycle may operate using a single refrigerant or an azeotropic mixture. The auxiliary regenerative vapor-liquid cycle operates with a zeotropic mixture refrigerant. The basic cycle may operate when the auxiliary cycle is deactivated.
    • 预冷汽 - 液制冷循环包括基本蒸汽 - 液体循环和它们之间具有热交换关系的辅助再生汽 - 液循环。 基本循环包括与冷凝器,节流装置和蒸发器串联的压缩机。 辅助循环包括连续地连接的压缩机,冷凝器,节流装置和逆流式热交换器。 这些循环各有一个由环境空气冷却的冷凝器; 基本循环能够独立于辅助循环运行。 为了最大化性能系数,基本循环在压缩机排放和回流之间以较小的压差进行操作。 在热交换器中,来自基础循环冷凝器的制冷剂流通过来自辅助循环的低温制冷剂的逆流排列进一步冷却,直到基本循环中的制冷剂已经从接近环境温度预冷到接近预期制冷温度。 基本周期和系统COP的效率得到提高。 在辅助循环中离开冷凝器的制冷剂在通过辅助节流装置之后,以相同的制冷剂流以逆流布置流过热交换器。 基本的汽液循环可以使用单一制冷剂或共沸混合物进行操作。 辅助再生气液循环与非共沸混合制冷剂一起运行。 当辅助循环停用时,基本循环可以运行。