VEHICLE REFRIGERANT SYSTEM USING HOT GAS BYPASS WITH VAPOR INJECTION

A vapor injection refrigerant system includes a compressor including at least first and second stage inputs, and an output arranged to provide output vapor refrigerant. A condenser is fluidly coupled to the output of the compressor to receive the output vapor refrigerant, and an evaporator is fluidly coupled between the condenser and the first stage input. The evaporator is arranged to provide refrigerant in vapor to the first stage input of the compressor. A chiller is fluidly coupled between the condenser and both the first and second stage inputs. The chiller is arranged to inject refrigerant in vapor form into the first stage input or the second stage input. A bypass branch fluidly couples the output of the compressor to the first stage input of the compressor to provide at least some of the output vapor refrigerant to the first stage input without routing through the condenser, evaporator, and chiller.