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Ammonia low-pressure receivers.

Author(s) : PEARSON S. F.

Type of article: Periodical article

Summary

The ammonia low-pressure receiver system has an overfed evaporator, the outlet of which connects to a receiver supplying dry saturated vapour to the compressor. The condenser is drained by a high-side pilot float/purger. Condensate is subcooled by heat exchange with low-pressure liquid at the bottom of the receiver. This also acts as an oil distiller, the oil being fed to the suction line. An high-pressure pilot-operated expansion valve feeds the evaporator. The receiver acts as a liquid store, a suction trap, obviates the need for evaporator outlet superheat and allows overfeeding to the extent controlled by the amount of liquid subcooling. Examples are given of increased efficiency for this system compared with conventional pump fed systems and direct expansion systems. Reverse cycle defrosting is simple to operate, and arguments are put forward for using multiple systems rather than central plants. D.W.H.

Details

  • Original title: Ammonia low-pressure receivers.
  • Record ID : 1997-0758
  • Languages: English
  • Source: Inst. Refrig., Adv. Proof - 8 p.; 4 fig.; 2 tabl.; 4 ref.
  • Publication date: 1996/01/11
  • Document available for consultation in the library of the IIR headquarters only.

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