IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
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출원번호 |
US-0975802
(2004-10-28)
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등록번호 |
US-7325414
(2008-02-05)
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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 :
7 인용 특허 :
5 |
초록
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A tandem compressor refrigerant system where an economizer circuit and reheat coil are incorporated to provide additional flexibility and control over overall system capacity and sensible heat ratio as well as to increase system efficiency. In this system, tandem compressors deliver compressed refri
A tandem compressor refrigerant system where an economizer circuit and reheat coil are incorporated to provide additional flexibility and control over overall system capacity and sensible heat ratio as well as to increase system efficiency. In this system, tandem compressors deliver compressed refrigerant to a common discharge manifold, and then to a common condenser. From the common condenser, the refrigerant passes to a plurality of evaporators, with each of the evaporators being associated with a separate environment to be conditioned. Each of the evaporators is associated with one or several of the plurality of compressors. By utilizing the common condenser, yet a plurality of evaporators, the ability to independently condition a number of sub-environments is achieved without the requirement of the same plurality of complete separate refrigerant circuits for each compressor. In particular, the economizer circuit provides additional capacity to any of the evaporators that have a relatively high load while the reheat coil provides improved dehumidification. Various design schematics and system configurations are disclosed.
대표청구항
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What is claimed is: 1. A refrigerant system comprising: a plurality of compressors, where at least two of said compressors deliver a refrigerant to a discharge manifold leading to a common condenser, refrigerant passing through said common condenser, and then expanding into a plurality of evaporato
What is claimed is: 1. A refrigerant system comprising: a plurality of compressors, where at least two of said compressors deliver a refrigerant to a discharge manifold leading to a common condenser, refrigerant passing through said common condenser, and then expanding into a plurality of evaporators, said plurality of evaporators associated with said plurality of said compressors, where said at least two compressors are connected to separate evaporators of said plurality of evaporators; and an economizer circuit positioned between said common condenser and at least one of said plurality of evaporators, and a reheat coil associated with at least one of said evaporators. 2. The refrigerant system as set forth in claim 1, wherein said economizer circuit includes an economizer heat exchanger, and a main flow of refrigerant passing through said economizer heat exchanger and then passing downstream to less than said plurality of evaporators. 3. The refrigerant system as set forth in claim 2, wherein refrigerant passing downstream of said economizer heat exchanger passes to only one of said evaporators. 4. The refrigerant system as set forth in claim 1, wherein said economizer circuit includes an economizer heat exchanger, and a main flow of refrigerant passing through said economizer heat exchanger and then passing downstream to a plurality of said evaporators. 5. The refrigerant system as set forth in claim 1, wherein said economizer circuit includes a tapped flow of refrigerant that is tapped off of a main flow of refrigerant upstream of an economizer heat exchanger and then passed through an economizer expansion device, and then through said economizer heat exchanger, said tapped flow of refrigerant being returned to an intermediate compression point in at least one of said compressors. 6. The refrigerant system as set forth in claim 1, wherein said economizer circuit includes a tapped flow of refrigerant that is tapped off of a main flow of refrigerant downstream of an economizer heat exchanger and then passed through an economizer expansion device, and then through said economizer heat exchanger, said tapped flow of refrigerant being returned to an intermediate compression point in at least one of said compressors. 7. The refrigerant system as set forth in claim 1, wherein refrigerant that is tapped to flow through said reheat coil bypasses said economizer circuit. 8. The refrigerant system as set forth in claim 1, wherein said reheat coil being positioned sequentially with said condenser. 9. The refrigerant system as set forth in claim 8, wherein said reheat coil is located downstream of said condenser. 10. The refrigerant system as set forth in claim 8, wherein said reheat coil is located upstream of said condenser. 11. The refrigerant system as set forth in claim 1, wherein said reheat coil is arranged to be parallel with said condenser. 12. The refrigerant system as set forth in claim 1, wherein said reheat coil is arranged to be sequential with an economizer heat exchanger. 13. The refrigerant system as set forth in claim 12, wherein said reheat coil is located downstream of said economizer heat exchanger. 14. The refrigerant system as set forth in claim 12, wherein said reheat coil is located upstream of said economizer heat exchanger. 15. The refrigerant system as Set forth in claim 1, wherein said reheat coil is arranged to be parallel with an economizer heat exchanger. 16. The refrigerant system as set forth in claim 1, wherein a bypass line and flow control device allows bypass of refrigerant around said condenser. 17. The refrigerant system as set forth in claim 1, wherein there are a plurality of reheat coils, with each of said reheat coils being associated with one of said plurality of evaporators. 18. The refrigerant system as set forth in claim 17, wherein said plurality of reheat coils are positioned to be in parallel flow relationship. 19. The refrigerant system as set forth in claim 17, wherein said plurality of reheat coils are positioned to be in serial flow relationship. 20. The refrigerant system as set forth in claim 1, wherein there are a plurality of reheat coils associated with at least one of said plurality of evaporators. 21. The refrigerant system as set forth in claim 1, wherein at least one of said compressors having a plurality of intermediate pressure ports, and there being a plurality of economizer heat exchangers in said economizer circuit operated at different temperature levels, and returning refrigerant to a respective one of said several intermediate pressure points. 22. The refrigerant system as set forth in claim 1, wherein at least one of said compressors has several compression stages connected in series. 23. The refrigerant system as set forth in claim 1, wherein a refrigerant flowing to said reheat coil can be adjusted through at least one of modulation and pulsation control. 24. A method of operating a refrigerant system comprising the steps of: 1) providing a refrigerant system including a plurality of compressors where at least two of said compressors delivering refrigerant to a common condenser through a discharge manifold, refrigerant passing from said common condenser to a plurality of evaporators, with each of said evaporator delivering refrigerant to one of said plurality of compressors, and an economizer circuit incorporated into said refrigerant system, said economizer circuit being associated with at least one of said plurality of evaporators such that refrigerant passing to said at least one of said plurality of evaporators has passed through an economizer heat exchanger prior to reaching said at least one of said plurality of evaporators, and providing a reheat coil associated with at least one of said plurality of evaporators; and 2) operating said refrigerant system by independently controlling refrigerant flow to each of said evaporators to achieve a desired condition for an environment conditioned by each of said evaporators, and selectively directing refrigerant through said economizer circuit and selectively passing refrigerant to said reheat coil. 25. The method as set forth in claim 24, wherein refrigerant passing through said economizer heat exchanger being directed to a plurality of said evaporators. 26. The method as set forth in claim 25, wherein refrigerant passing through said economizer heat exchanger is sent to each of said plurality of evaporators. 27. The method as set forth in claim 24, wherein refrigerant passing through said economizer heat exchanger is directed to only one of said evaporators. 28. The method as set forth in claim 24, wherein said economizer circuit includes a tapped flow of refrigerant that is tapped off of a main flow of refrigerant upstream of an economizer heat exchanger and passed through an expansion device, and then through said economizer heat exchanger, said tapped flow of refrigerant being returned to an intermediate compression point in at least one of said compressors. 29. The method as set forth in claim 24, wherein said economizer circuit includes a tapped flow of refrigerant that is tapped off of a main flow of refrigerant downstream of an economizer heat exchanger and passed through an expansion device, and then through said economizer heat exchanger, said tapped flow of refrigerant being returned to an intermediate compression point in at least one of said compressors. 30. The method as set forth in claim 24, wherein refrigerant that passes through said reheat coil bypasses said economizer circuit. 31. The method as set forth in claim 24, wherein said reheat coil being positioned sequentially with said condenser. 32. The method as set forth in claim 31, wherein said reheat coil is located downstream of said condenser. 33. The method as set forth in claim 31, wherein said reheat coil is located upstream of said condenser. 34. The method as set forth in claim 24, wherein said reheat coil is arranged to be parallel with said condenser. 35. The method as set forth in claim 24, wherein said reheat coil is arranged to be sequential with said economizer heat exchanger. 36. The method as set forth in claim 35, wherein said reheat coil is located downstream of said economizer heat exchanger. 37. The method as set forth in claim 36, wherein said reheat coil is located upstream of said economizer heat exchanger. 38. The method as set forth in claim 24, wherein said reheat coil is arranged to be parallel with said economizer heat exchanger. 39. The method as set forth in claim 24, wherein there are a plurality of reheat coils, with each of said plurality of reheat coils being associated with one of said plurality of evaporators. 40. The method as set forth in claim 39, wherein said plurality of reheat coils are positioned to be in parallel flow relationship. 41. The method as set forth in claim 39, wherein there are a plurality of reheat coils positioned to be in serial flow relationship. 42. The method as set forth in claim 24, wherein there are a plurality of reheat coils associated with at least one of said plurality of evaporators. 43. The method as set forth in claim 24, wherein at least one of said compressors having a plurality of intermediate pressure ports, and there being a plurality of economizer heat exchangers in said economizer circuit operated at different temperature levels, and returning refrigerant to a respective one of said several intermediate pressure points. 44. The method as set forth in claim 24, wherein at least one of said compressors has several compression stages connected in series. 45. The method as set forth in claim 24, wherein a refrigerant flowing to said reheat coil can be adjusted through at least one of modulation and pulsation control. 46. The refrigerant system as set forth in claim 1, wherein said economizer circuit includes a tapped flow of refrigerant that is tapped off of a main flow of refrigerant, and passed in heat exchange relationship with said main flow of refrigerant in an economizer heat exchanger, and said tapped flow of refrigerant being returned to an intermediate compression point in at least one of said compressors. 47. The refrigerant system as set forth in claim 46, wherein said returned tapped flow of refrigerant not being returned to at least one other of said compressors.
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