HYBRID TANDEM COMPRESSOR SYSTEM WITH MULTIPLE EVAPORATORS AND ECONOMIZER CIRCUIT

摘要

A tandem compressor refrigerant cycle with an economizer circuit is introduced to provide additional capacity and improve system efficiency. In this system, tandem compressors deliver compressed refrigerant to a common discharge manifold, and then to a common condenser. From the common condenser, the refrigerant passes to a plurality of evaporators, with each of the evaporators being associated with a separate environment to be conditioned. Each of the evaporators is associated with one of the plurality of compressors. By utilizing the common condenser, and yet a plurality of evaporators, the ability to independently condition a number of environments is achieved without the requirement of the same plurality of separate complete refrigerant circuits for each of the environments. In some embodiments, several of the plurality of compressors can be provided by compressor banks having its own plurality of compressors. Some of the compressors in the compressor bank can have intermediate injection ports to accept refrigerant vapor from the economizer circuit. In particular, the economizer circuit provides additional capacity to the evaporators with relatively high load requirements.