CASCADE REFRIGERATION SYSTEM WITH MODULAR AMMONIA CHILLER UNITS

摘要

A cascade refrigeration system includes an upper portion. The upper portion includes at least one modular chiller unit that provides cooling to at least one of a low temperature subsystem having a plurality of low temperature loads, and a medium temperature subsystem having a plurality of medium temperature loads. The modular chiller unit includes a refrigerant circuit, an ammonia refrigerant, an ammonia refrigerant accumulator, and an oil separation system. The refrigerant circuit includes at least a compressor, a condenser, an expansion device, and an evaporator. The ammonia refrigerant is configured for circulation within the refrigerant circuit. The ammonia refrigerant accumulator is configured to receive the ammonia refrigerant from the evaporator. The oil separation system is configured to remove oil from the ammonia refrigerant. The oil separation system includes an oil separator that is configured to remove oil from the ammonia refrigerant flowing from the compressor to the condenser, an oil drain pot that is configured to collect oil from the evaporator, and an oil reservoir that is configured to collect oil from the oil separator and the oil drain pot.

主权项

1. A cascade refrigeration system, comprising:
an upper portion having at least one modular chiller unit that provides cooling to at least one of a low temperature subsystem having a plurality of low temperature loads, and a medium temperature subsystem having a plurality of medium temperature loads; the modular chiller unit comprising: a refrigerant circuit having at least a compressor, a condenser, an expansion device, and an evaporator; an ammonia refrigerant configured for circulation within the refrigerant circuit; an ammonia refrigerant accumulator configured to receive the ammonia refrigerant from the evaporator; and an oil separation system configured to remove oil from the ammonia refrigerant, the oil separation system having an oil separator configured to remove oil from the ammonia refrigerant flowing from the compressor to the condenser, an oil drain pot configured to collect oil from the evaporator, and an oil reservoir configured to collect oil from the oil separator and the oil drain pot.