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In ammonia cold houses, after distillation in the condenser, the refrigerant enters from the receiver into a tank called Low Pressure Receiver or Separator. In this tank, the refrigerant pressure is reduced to the pressure corresponding to the required temperature in the evaporator, and the refrigerant liquid formed from the flash vapor is separated by gravity; The refrigerant liquid is collected at the bottom of the tank and the separated vapor is sucked into the compressor, and the refrigerant liquid is sent to the evaporator by a pump, and some of it evaporates, and a mixture of liquid and vapor returns to the separator, then the returned liquid from The steam is separated and the refrigerant vapor returns to the compressor and the liquid is collected at the bottom of the tank. In addition, this cycle can be extended to several stages. LP Receiver plays two basic roles in this system:
1- Separation of vapor from liquid to ensure that only gas is drawn to the compressor.
2- Storing the liquid refrigerant at the required temperature and making it available to meet the required refrigerant of the evaporator.
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