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A temperature control system includes a compressor, a condenser, an evaporator, a receiver, and an accumulator. A valve is positioned between the evaporator and the receiver. An evacuation line has a first end in fluid communication with heat transfer fluid between the valve and the receiver, and a

A temperature control system includes a compressor, a condenser, an evaporator, a receiver, and an accumulator. A valve is positioned between the evaporator and the receiver. An evacuation line has a first end in fluid communication with heat transfer fluid between the valve and the receiver, and a second end in fluid communication with the accumulator. The evacuation line provides for flow of the heat transfer fluid from both of the first heat exchanger and the receiver to the accumulator during an evacuation mode of operation of the temperature control system. The valve can take the form of a check valve or an expansion valve without a bleed port.

대표청구항 ▼

1. A temperature control system comprising: a compressor configured to compress a heat transfer fluid;a first heat exchanger in fluid communication with the compressor and configured to receive the heat transfer fluid from the compressor and to cool and condense the heat transfer fluid;a second heat

1. A temperature control system comprising: a compressor configured to compress a heat transfer fluid;a first heat exchanger in fluid communication with the compressor and configured to receive the heat transfer fluid from the compressor and to cool and condense the heat transfer fluid;a second heat exchanger in fluid communication with the first heat exchanger and the compressor and configured to exchange heat with a temperature-controlled space;a receiver in fluid communication with each of the first and second heat exchangers, the receiver positioned between the first heat exchanger and the second heat exchanger and configured to receive condensed heat transfer fluid from the first heat exchanger and to direct heat transfer fluid to the second heat exchanger;a valve positioned between the receiver and the second heat exchanger;an accumulator in fluid communication with the second heat exchanger and the compressor and configured to receive a mixture of liquid and vapor heat transfer fluid from the second heat exchanger and direct a vapor portion of the heat transfer fluid to the compressor;an evacuation line having a first end in fluid communication with and positioned between the valve and the receiver, and a second end in fluid communication with the accumulator, the evacuation line providing for flow of the heat transfer fluid from both of the first heat exchanger and the receiver to the accumulator during an evacuation mode of operation of the temperature control system;a valve arrangement in fluid communication with the first heat exchanger, the compressor, and the second heat exchanger, the valve arrangement operable in a first configuration and a second configuration, wherein the first configuration is operable to direct the heat transfer fluid from the compressor to the first heat exchanger and the second configuration is operable to direct the heat transfer fluid from the compressor to the second heat exchanger without passing through the first heat exchanger; anda controller in electrical communication with the valve arrangement, the controller operable to move the valve arrangement between the first configuration and the second configuration,wherein the valve substantially prevents the flow of heat transfer fluid from the second heat exchanger into the receiver. 2. The temperature control system of claim 1, wherein the valve is positioned between the second heat exchanger and a filter/dryer. 3. The temperature control system of claim 2, wherein the first end of the evacuation line is positioned between the filter/dryer and the receiver. 4. The temperature control system of claim 1, wherein the valve is a check valve. 5. The temperature control system of claim 1, wherein the valve is an expansion valve without a bleed port. 6. The temperature control system of claim 1, further comprising a purge valve movable between a closed position, preventing flow of heat transfer fluid through the evacuation line to the accumulator, and an open position, allowing flow of heat transfer fluid through the evacuation line to the accumulator without passing through the second heat exchanger, wherein the purge valve is in the open position in at least one of the evacuation mode and a heating mode of the temperature control system. 7. The temperature control system of claim 6, wherein the purge valve is in the open position in both of the evacuation mode and the heating mode of the temperature control system. 8. The temperature control system of claim 6, wherein the evacuation mode defines an evacuation circuit configured to allow at least a portion of the condensed heat transfer fluid to enter the accumulator from the first heat exchanger and the receiver, bypassing the second heat exchanger, wherein the evacuation circuit includes the compressor, the first heat exchanger, the receiver, the evacuation line, and the accumulator fluidly connected in series. 9. The temperature control system of claim 1, wherein the temperature control system enters the evacuation mode after the temperature control system exits a cooling mode and before the temperature control system enters a heating mode. 10. The temperature control system of claim 1, wherein the first configuration corresponds to a cooling mode of the temperature control system and the second configuration corresponds to a heating mode of the temperature control system. 11. The temperature control system of claim 10, wherein the cooling mode defines a cooling circuit for cooling the temperature-controlled space, wherein the cooling circuit includes the compressor, the first heat exchanger, the receiver, the second heat exchanger, and the accumulator fluidly connected in series. 12. The temperature control system of claim 11, wherein the heating mode defines a heating circuit for at least one of defrosting the second heat exchanger and heating the temperature-controlled space, wherein the heating circuit bypasses the first heat exchanger and includes the compressor, the second heat exchanger, and the accumulator fluidly connected in series. 13. The temperature control system of claim 1, wherein the compressor is a scroll compressor, the temperature control system further comprising a liquid injection cooling line fluidly connected between the compressor and a point downstream of the receiver such that a portion of the heat transfer fluid can flow back to the compressor to cool the compressor. 14. The temperature control system of claim 13, further comprising a valve coupled with the liquid injection cooling line to control flow of the heat transfer fluid through the liquid injection cooling line, the valve being opened during a cooling cycle to permit the flow of heat transfer fluid back to the compressor, and the valve being closed during the evacuation mode. 15. A method of operating a temperature control system having a compressor, a first heat exchanger downstream of the compressor, a receiver downstream of the first heat exchanger, a valve downstream of the receiver, a second heat exchanger downstream of the valve, and an accumulator downstream of the second heat exchanger, the method comprising: a) operating the system in a cooling mode by compressing a heat transfer fluid with the compressor;directing the heat transfer fluid from the compressor to the first heat exchanger with a valve arrangement in a first configuration;cooling and condensing the heat transfer fluid from the compressor in the first heat exchanger;exchanging heat between a temperature-controlled space and the heat transfer fluid with the second heat exchanger;receiving a mixture of liquid and vapor heat transfer fluid from the second heat exchanger into the accumulator; anddirecting a vapor portion of the heat transfer fluid in the accumulator to the compressor;b) operating the system in an evacuation mode by opening a purge valve coupled to an evacuation line, the evacuation line having a first end in fluid communication with and positioned between the valve and the receiver, and a second end in fluid communication with the accumulator, the evacuation line providing flow of the heat transfer fluid from both of the first heat exchanger and the receiver to the accumulator without passing through the second heat exchanger; andsubstantially preventing the flow of heat transfer fluid from the second heat exchanger into the receiver with the valve;c) operating the system in a heating mode by moving the valve arrangement from the first configuration to a second configuration;directing the heat transfer fluid from the compressor to the second heat exchanger without passing through the first heat exchanger; andmaintaining the purge valve open. 16. The method of claim 15, further comprising: closing the purge valve only while operating the system in the cooling mode. 17. The method of claim 15, wherein operating the system in the evacuation mode further includes fluidly connecting in series an evacuation circuit including the compressor, the first heat exchanger, the receiver, the evacuation line, and the accumulator;allowing at least a portion of the condensed heat transfer fluid to enter the accumulator from the first heat exchanger and the receiver; andbypassing the second heat exchanger. 18. The method of claim 15, further comprising entering the evacuation mode after the temperature control system exits the cooling mode and before the temperature control system enters the heating mode. 19. The method of claim 15, wherein operating the system in the cooling mode further includes directing a portion of the heat transfer fluid from a point downstream of the receiver back to the compressor through a liquid injection cooling line to cool the compressor. 20. The method of claim 15, wherein substantially preventing the flow of heat transfer fluid from the second heat exchanger into the receiver with the valve includes using an expansion valve without a bleed port. 21. The method of claim 15, wherein substantially preventing the flow of heat transfer fluid from the second heat exchanger into the receiver with the valve includes using a check valve.