IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0891939
(2004-07-15)
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발명자
/ 주소 |
- Taras, Michael F.
- Lifson, Alexander
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
17 인용 특허 :
3 |
초록
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An economizer loop is incorporated into the refrigerant system, which in conjunction with any selected reheat mode of operation, provides augmented performance, improved reliability, and enhanced control in meeting external heat load demands. A refrigerant system includes several features that can b
An economizer loop is incorporated into the refrigerant system, which in conjunction with any selected reheat mode of operation, provides augmented performance, improved reliability, and enhanced control in meeting external heat load demands. A refrigerant system includes several features that can be selectively utilized alone or in combination with each other to provide an enhanced control over system cooling and dehumidification capability. In particular, a reheat coil is incorporated into the refrigerant system, and has alternative connection points to the main circuit, positioned both upstream and downstream of a condenser. Also, a flow control device allows a selective bypass around a condenser. In this manner, the refrigerant flowing through the reheat coil can be controlled to provide a desired level of temperature and humidity. Finally, the compressor may include an unloader feature such that additional steps in capacity control can be provided.
대표청구항
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1. The refrigerant system comprising:a compressor for compressing refrigerant and delivering refrigerant to a condenser, said refrigerant being delivered from said condenser to a main expansion device, and said refrigerant being delivered from said main expansion device to an evaporator, and an air
1. The refrigerant system comprising:a compressor for compressing refrigerant and delivering refrigerant to a condenser, said refrigerant being delivered from said condenser to a main expansion device, and said refrigerant being delivered from said main expansion device to an evaporator, and an air moving device for moving air over said evaporator and into an environment to be conditioned, and refrigerant from said evaporator returning to said compressor;a reheat coil for receiving a refrigerant, said reheat coil being positioned in a path of air moved by said air moving device, and refrigerant taps for passing refrigerant to said reheat coil, said refrigerant taps each being provided with a flow control device with one of said flow control devices located at a first location between said condenser and said compressor, and a second of said flow control devices located between said condenser and said main expansion device; andan economizer circuit for providing an economizer function.2. The refrigerant system as set forth in claim 1, wherein said economizer circuit includes a refrigerant tapped from a main refrigerant line downstream of said condenser and upstream of said main expansion device, said tapped refrigerant passing through an economizer expansion device and into an economizer heat exchanger, said tapped refrigerant exchanging heat with a main refrigerant flow in said economizer heat exchanger.3. The refrigerant system as set forth in claim 2, wherein said economizer circuit is positioned in a parallel arrangement with said reheat coil.4. The refrigerant system as set forth in claim 2, wherein said economizer circuit is positioned in a sequential arrangement with said reheat coil.5. The refrigerant system as set forth in claim 2, wherein said tap for said economizer circuit is located downstream of said second flow control device for said reheat coil.6. The refrigerant system as set forth in claim 2, wherein a bypass flow control device is positioned to selectively bypass at least a portion of refrigerant around said condenser, said bypass flow control device being able to allow said portion of refrigerant to move from said compressor to a return point upstream of said main expansion device without passing through said condenser.7. The refrigerant system as set forth in claim 6, wherein said tap for said economizer circuit is located downstream of said condenser and upstream of said return point.8. The refrigerant system as set forth in claim 1, wherein an unloader device is positioned to selectively move refrigerant from compression chambers in said compressor back to a suction line leading to said compressor.9. The refrigerant system as set forth in claim 1, wherein a line is positioned to communicate a refrigerant downstream of said reheat coil back to a location intermediate said condenser and said compressor, and a flow control device being positioned on said return line.10. The refrigerant system as set forth in claim 3, wherein the reheat coil has an alternative downstream destination located intermediate said economizer heat exchanger and said main expansion device, and a flow control device placed upon a second return line leading to said alternative downstream destination.11. The refrigerant system as set forth in claim 2, wherein said second flow control device for said reheat coil, which is downstream of said condenser, being positioned downstream of a location wherein main flow through said economizer heat exchanger returns to said main refrigerant line.12. The refrigerant system as set forth in claim 1, wherein said second flow control device is positioned upstream of a return point for returning refrigerant from said economizer heat exchanger to a main refrigerant line.13. A method of controlling a refrigerant system comprising the steps of:(1) providing a compressor for compressing refrigerant, a condenser downstream of said compressor, a main expansion device downstream of said condenser, an evaporator downstream of said main expansion device, an air moving device for moving air over said evaporator and into an environment to be conditioned, a reheat coil for receiving a refrigerant, said reheat coil being positioned in a path of air moved by said air moving device, and refrigerant taps for passing refrigerant to said reheat coil, said refrigerant taps each being provided with a flow control device, with one of said flow control devices located at a first location between said condenser and said compressor, and a second of said flow control devices located between said condenser and said main expansion device, and an economizer circuit providing an economizer function; and(2) determining that a reheat function is utilized, and selecting one of said flow control devices to provide a refrigerant to said reheat coil.14. The method as set forth in claim 13, wherein said economizer circuit is provided with a main refrigerant line and said economizer tap, with both said main refrigerant line and said economizer tap passing through an economizer heat exchanger, and an economizer expansion device provided on said economizer tap, and selectively passing refrigerant from said economizer tap through said economizer heat exchanger and through said economizer expansion device.15. The method as set forth in claim 13, wherein a bypass line selectively allows refrigerant to bypass said condenser, said bypass line including a selectively open flow control device that controls the flow of refrigerant through said bypass line and around said condenser, and opening said flow control device when it is determined that it is desirable for said refrigerant to bypass said condenser.16. The method as set forth in claim 13, wherein an unloader selectively communicates compressed refrigerant at said compressor back to a suction line for said compressor, and selectively opening said unloader to return refrigerant that has been compressed by said compressor to said suction line when desired.
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