IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
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출원번호 |
US-0936247
(2004-09-08)
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발명자
/ 주소 |
- Reason, John
- Nader, Awwad
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출원인 / 주소 |
|
대리인 / 주소 |
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인용정보 |
피인용 횟수 :
3 인용 특허 :
4 |
초록
▼
A refrigerant cycle is provided with a transient mode for moving from a defrost cycle back to steady state operation. In particular, some default position of the expansion device is selected when defrost cycle ends. The evaporator is hot at the end of defrost cycle, and might otherwise suggest an in
A refrigerant cycle is provided with a transient mode for moving from a defrost cycle back to steady state operation. In particular, some default position of the expansion device is selected when defrost cycle ends. The evaporator is hot at the end of defrost cycle, and might otherwise suggest an increased flow of refrigerant through the expansion device, which could be undesirable. Thus, a control for the inventive system moves the expansion device to a defrost transient position, with the defrost transient position restricting the flow of refrigerant to a value that would be less than that dictated by the high temperature of the evaporator. At some period of time after the end of the defrost mode, the refrigerant cycle can be returned to state steady operation.
대표청구항
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1. A refrigerant cycle comprising:a compressor delivering refrigerant to a condenser, refrigerant passing from said condenser to an expansion device, said expansion device having a variable orifice size to meter refrigerant flowing through said expansion device, refrigerant flowing though said expan
1. A refrigerant cycle comprising:a compressor delivering refrigerant to a condenser, refrigerant passing from said condenser to an expansion device, said expansion device having a variable orifice size to meter refrigerant flowing through said expansion device, refrigerant flowing though said expansion device passing downstream to an evaporator, the amount of refrigerant passing to said evaporator being at least partially dependent upon an evaporator condition under normal operating conditions, and refrigerant passing from said evaporator back to said compressor;a defrost element provided at said evaporator; anda control for at least said compressor and said defrost element, said control further being operable to control the amount of refrigerant passing to said evaporator, said control being operable to initiate a defrost cycle by actuating said defrost element and stopping said compressor, said control further being operable to end said defrost cycle and move said refrigerant cycle into a defrost transient mode, and said control controlling an amount of refrigerant passing to said evaporator by utilizing a defrost transient value at the end of the defrost cycle.2. The refrigerant cycle as set forth in claim 1, wherein said control stores a previous position of said expansion device as said defrost transient value.3. The refrigerant cycle as set forth in claim 1, wherein said defrost transient value is independent of any refrigerant condition at the end of the defrost cycle.4. The refrigerant cycle as set forth in claim 1, wherein said defrost element is a heater element.5. The refrigerant cycle as set forth in claim 1, wherein an air handler passes air over said evaporator and into an environment to be conditioned, said air handler being stopped during said defrost cycle.6. The refrigerant cycle as set forth in claim 5, wherein said air handler is started at the end of defrost cycle for a period of time after said compressor is started.7. The refrigerant cycle as set forth in claim 1, wherein said expansion device is an electronically controlled expansion device, and said control providing said defrost transient value to said expansion device.8. The refrigerant cycle as set forth in claim 1, wherein said expansion device is mechanically controlled, said control controlling a valve positioned upstream of said expansion device with said valve being operable to restrict flow of refrigerant from said expansion device to said evaporator to said defrost transient value.9. A method of operating a refrigerant cycle comprising the steps of:providing a compressor delivering refrigerant to a condenser, refrigerant passing from said condenser to an expansion device, said expansion device having a variable orifice size to meter refrigerant flowing through said expansion device, refrigerant flowing though said expansion device passing downstream to an evaporator, the amount of refrigerant passing to said evaporator being at least partially dependent upon an evaporator condition under normal operating conditions, and refrigerant passing from said evaporator back to said compressor, a defrost function provided at said evaporator;initiating a defrost cycle by activating a defrost element and stopping said compressor;ending said defrost cycle by stopping said defrost element and starting said compressor, moving said refrigerant cycle into a defrost transient mode; andmetering refrigerant passing to the evaporator based upon a previously stored defrost transient value.10. The method as set forth in claim 9, wherein said control storing a previous position of said expansion device as said defrost transient value.11. The method as set forth in claim 9, wherein an air handler passes air over said evaporator and into an environment to be conditioned, said air handler being stopped during said defrost cycle.12. The method cycle as set forth in claim 11, wherein said air handler is started at the end of defrost cycle for a period of time after said compressor is started.13. The method as set forth in claim 9, wherein said expansion device is an electronically controlled expansion device, and said control providing said defrost transient value to said expansion device.14. The method as set forth in claim 9, wherein said expansion device is mechanically controlled, said control controlling a valve positioned upstream of said expansion device with said valve restricting flow of refrigerant from said expansion device to said evaporator based upon said defrost transient value.
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