A vapor compression system includes a main vapor compression circuit including a compressor, a condenser, an expansion device and an evaporator serially connected by main refrigerant lines, the compressor having a main discharge port, a suction port and an economizer/bypass port, an economizer circu
A vapor compression system includes a main vapor compression circuit including a compressor, a condenser, an expansion device and an evaporator serially connected by main refrigerant lines, the compressor having a main discharge port, a suction port and an economizer/bypass port, an economizer circuit connected between the condenser and the economizer/bypass port of the compressor and including an auxiliary expansion device and a heat exchanger serially connected by economizer refrigerant lines, the economizer refrigerant lines and the main refrigerant lines being exposed to each other for heat exchange in the heat exchanger; and a bypass circuit including a bypass line extending from the economizer/bypass port to the suction port, and a bypass valve positioned along the bypass line, the bypass valve being positionable between a closed position wherein the economizer circuit is active and the bypass circuit is inactive, and an open position wherein the economizer circuit is active and the bypass circuit is active. The system and method advantageously allow for the economizer circuit and bypass circuit to be operational at the same time. By using an electronically controlled auxiliary expansion device, four modes of operation are permissible. As a result, life cycle and system costs can be reduced and compressor reliability and system performance can be enhanced. Additionally the control scheme and method extend the system operating envelope, hence preventing nuisance shutdowns, and further improving compressor reliability.
대표청구항▼
1. A vapor compression system, comprising:a main vapor compression circuit comprising a compressor, a condenser, an expansion device and an evaporator serially connected by main refrigerant lines, said compressor having a main discharge port, a suction port and an economizer/bypass port,an economize
1. A vapor compression system, comprising:a main vapor compression circuit comprising a compressor, a condenser, an expansion device and an evaporator serially connected by main refrigerant lines, said compressor having a main discharge port, a suction port and an economizer/bypass port,an economizer circuit connected between said condenser and said economizer/bypass port of said compressor and comprising an auxiliary expansion device and a heat exchanger serially connected by economizer refrigerant lines, said economizer refrigerant lines and said main refrigerant lines being exposed to each other for heat exchange in said heat exchanger; anda bypass circuit comprising a bypass line extending from said economizer/bypass port to said suction port, and a bypass valve positioned along said bypass line, said bypass valve being positionable between a closed position wherein said economizer circuit is active and said bypass circuit as inactive, and an open position wherein said economizer circuit is active and said bypass circuit is active; anda control unit operatively associated with at least one of said bypass valve and said auxiliary expansion device for controlling same, said control unit being adapted to selectively operate said system in a first mode of operation wherein said bypass valve is closed, said bypass circuit is inactive and said economizer circuit is active, and a second mode of operation wherein said bypass valve is open, said bypass circuit is active and said economizer circuit is active.2. The system of claim 1, wherein, when said bypass valve is open, flow through said bypass circuit, said economizer circuit and said main vapor compression circuit combine and flow to said suction port of said compressor, and when said bypass valve is closed, flow from said economizer circuit enters said economizer/bypass port and flow from said main vapor compression circuit enters said suction port.3. The system of claim 1, wherein said control unit is communicated with said compressor so as to determine a parameter related to compressor discharge temperature, and wherein said control unit is adapted to open and close said bypass valve based upon said parameter, whereby said system can be selectively operated with said bypass circuit inactive and said economizer circuit active, and with said bypass circuit active and said economizer circuit active.4. The system of claim 1, wherein said auxiliary expansion device is an electronic expansion device which can be selectively controlled to allow and block flow through said economizer circuit.5. The system of claim 4, wherein said control unit is communicated with said compressor so as to determine a parameter related to compressor discharge temperature and wherein said control unit is adapted to open and close said bypass valve and said auxiliary expansion device based upon said parameter, whereby said system can be selectively operated with said bypass circuit and said economizer circuit inactive, with said bypass circuit inactive and said economizer circuit active, with said bypass circuit and said economizer circuit active, and with said economizer circuit inactive and said bypass circuit active.6. A method for operating a vapor compression system comprising a main vapor compression circuit including a compressor, a condenser, an expansion device and an evaporator serially connected by main refrigerant lines, said compressor having a main discharge port, a suction port and an economizer/bypass port, an economizer circuit connected between said condenser and said economizer/bypass port of said compressor and including an auxiliary expansion device and a heat exchanger serially connected by economizer refrigerant lines, said economizer refrigerant lines and said main refrigerant lines being exposed to each other for heat exchange in said heat exchanger, and a bypass circuit including a bypass line extending from said economizer/bypass port to said suction port, and a bypass valve positioned along said bypass line, said bypass valve being positionable between a closed position wherein said economizer circuit is active and said bypass circuit is inactive, and, an open position wherein said economizer circuit is active and said bypass circuit is active, comprising:selectively operating said system in a first mode of operation wherein said bypass valve is closed, said bypass circuit is inactive and said economizer circuit is active, and a second mode of operation wherein said bypass valve is open, said bypass circuit is active and said economizer circuit is active.7. The method of claim 6, wherein said auxiliary expansion device is an electronic expansion device which can be selectively controlled to allow and block flow through said economizer circuit, and wherein said selectively controlling step comprises selectively controlling said bypass valve and said electronic expansion device so as to operate said system in a first mode of operation wherein said bypass circuit is active and said economizer circuit is active, a second mode of operation wherein said bypass circuit is inactive and said economizer circuit is active, a third mode of operation wherein said bypass circuit is active and said economizer circuit is inactive, and a fourth mode of operation wherein said bypass circuit is inactive and said economizer is inactive.8. The method of claim 6, further comprising selectively operating said auxiliary expansion device so as to control at least one of temperature and phase of flow leaving said heat exchanger whereby temperature of flow to said suction port can be controlled.9. A vapor compression system, comprising:a main vapor compression circuit comprising a compressor, a condenser, an expansion device and an evaporator serially connected by main refrigerant lines, said compressor having a main discharge port, a suction port and an economizer/bypass port,an economizer circuit connected between said condenser and said economizer/bypass port of said compressor and comprising an auxiliary expansion device and a heat exchanger serially connected by economizer refrigerant lines, said economizer refrigerant lines and said main refrigerant lines being exposed to each other for heat exchange in said heat exchanger; anda bypass circuit comprising a bypass line extending from said economizer/bypass port to said suction port, and a bypass valve positioned along said bypass line, said bypass valve being positionable between a closed position wherein said economizer circuit is active and said bypass circuit is inactive, and an open position wherein said economizer circuit is active and said bypass circuit is active, andfurther comprising a control unit operatively associated with at least one of said bypass valve and said auxiliary expansion device for controlling same, wherein said control unit is communicated with said compressor so as to determine a parameter related to compressor discharge temperature, and wherein said control unit is adapted to open and close said bypass valve based upon said parameter, whereby said system can be selectively operated with said bypass circuit inactive and said economizer circuit active, and with said bypass circuit active and said economizer circuit active.10. A vapor compression system, comprising:a main vapor compression circuit comprising a compressor, a condenser, an expansion device and an evaporator serially connected by main refrigerant lines, said compressor having a main discharge port, a suction port and an economizer/bypass port,an economizer circuit connected between said condenser and said economizer/bypass port of said compressor and comprising an auxiliary expansion device and a heat exchanger serially connected by economizer refrigerant lines, said economizer refrigerant lines and said main refrigerant lines being exposed to,each other for heat exchange in said heat exchanger; anda bypass circuit comprising a bypass line extending from said economizer/bypass port to said suction port, and a bypass valve positioned along said bypass line, said bypass valve being positionable between a closed position wherein said economizer circuit is active and said bypass circuit is inactive, and an open position wherein said economizer circuit is active and said bypass circuit is active, andfurther comprising a control unit operatively associated with at least one of said bypass valve and said auxiliary expansion device for controlling same, wherein said auxiliary expansion device is an electronic expansion device which can be selectively controlled to allow and block flow through said economizer circuit, and wherein said control unit is communicated with said compressor so as to determine a parameter related to compressor discharge temperature and wherein said control unit is adapted to open and close said bypass valve and said auxiliary expansion device based upon said parameter, whereby said system can be selectively operated with said bypass circuit and said economizer circuit inactive, with said bypass circuit inactive and said economizer circuit active, with said bypass circuit and said economizer circuit active, and with said economizer circuit inactive and said bypass circuit active.
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이 특허에 인용된 특허 (7)
Igor Vaisman CA, Capacity control of refrigeration systems.
Lifson, Alexander; Bush, James W.; Taras, Michael F.; Fraser, Jr., Howard H.; Lewis, Russell G., Injection of liquid and vapor refrigerant through economizer ports.
Lifson Alexander ; Karpman Boris, Method of optimizing cooling capacity, energy efficiency and reliability of a refrigeration system during temperature pull down.
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