Oil return for a direct exchange geothermal heat pump
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F25B-031/00
F25B-023/00
F25B-043/02
출원번호
US-0435197
(2009-05-04)
등록번호
US-8402780
(2013-03-26)
발명자
/ 주소
Wiggs, B. Ryland
출원인 / 주소
Earth to Air Systems, LLC
대리인 / 주소
Miller, Matthias & Hull LLP
인용정보
피인용 횟수 :
2인용 특허 :
98
초록▼
A heating/cooling system design enabling one to maintain a superheat level of more than 1 degree F. and up to 10 degrees F., incorporating a specially designed accumulator, optional special oil return means, a specially designed receiver, and, when utilized in a DX geothermal system application, a p
A heating/cooling system design enabling one to maintain a superheat level of more than 1 degree F. and up to 10 degrees F., incorporating a specially designed accumulator, optional special oil return means, a specially designed receiver, and, when utilized in a DX geothermal system application, a preferable sub-surface liquid refrigerant transport line insulation design, as well as a design enabling the utilization of at least two compressors to increase heat transfer temperature differentials together with special oil separators.
대표청구항▼
1. A direct exchange geothermal heat pump system comprising: refrigerant tubing including a liquid tubing coupled to a vapor tubing, a sub-surface portion of the liquid tubing together with a sub-surface portion of the vapor tubing defining an exterior geothermal heat exchanger;a refrigerant dispose
1. A direct exchange geothermal heat pump system comprising: refrigerant tubing including a liquid tubing coupled to a vapor tubing, a sub-surface portion of the liquid tubing together with a sub-surface portion of the vapor tubing defining an exterior geothermal heat exchanger;a refrigerant disposed in the refrigerant tubing and having a refrigerant weight;a first compressor having a first compressor suction line fluidly communicating with the refrigerant tubing and a first compressor discharge line;an interior heat exchanger disposed in the refrigerant tubing and having a first end fluidly communicating with first compressor discharge line and a second end fluidly communicating with the exterior geothermal heat exchanger;an initial oil charge equal to a factory recommended volume of oil for the first compressor; andan extra oil charge having a weight of at least 7% of the refrigerant weight. 2. The direct exchange geothermal heat pump system of claim 1, further comprising a second compressor having a second compressor suction line fluidly communicating with the first compressor discharge line, and a second compressor discharge line, in which the interior heat exchanger first end fluidly communicates with the second compressor discharge line, and in which the initial oil charge is equal to a factory recommended volume of oil for both the first and second compressors. 3. The direct exchange geothermal heat pump system of claim 1, further comprising an accumulator having an accumulator inlet fluidly communicating with the refrigerant tubing and an accumulator outlet fluidly communicating with the first compressor suction line. 4. The direct exchange geothermal heat pump system of claim 3, in which the accumulator holds a volume of liquid refrigerant, and in which a portion of the vapor tubing extends into the accumulator to define a distal open end disposed below a surface of the volume of liquid refrigerant. 5. The direct exchange geothermal heat pump system of claim 1, further comprising: an oil separator having a top portion defining an inlet fluidly communicating with the first compressor outlet and a bottom portion configured to collect oil;an oil return line communicating between the accumulator and the oil separator; anda fixed orifice pin restrictor disposed in the oil return line, the fixed orifice pin restrictor having a pin size diameter sized according to a compressor capacity as follows: for compressor capacities up to 12,000 BTU, the pin size diameter is equal to approximately 0.003225 inches for each 1,000 BTU of compressor capacity; andfor compressor capacities above 12,000 BTU, the pin size diameter is equal to approximately 0.039 inches plus approximately 0.000216 inches for each 1,000 BTU of compressor capacity above 12,000 BTU. 6. The direct exchange geothermal heat pump system of claim 1, in which the sub-surface portion of the liquid tubing and the sub-surface portion of the vapor tubing extend substantially vertically. 7. The direct exchange geothermal heat pump system of claim 1, in which the exterior geothermal heat exchanger extends at least 100 feet below a ground surface. 8. The direct exchange geothermal heat pump system of claim 1, in which the interior heat exchanger comprises at least one of an air handler and a refrigerant to water heat exchanger. 9. A direct exchange geothermal heat pump system comprising: refrigerant tubing including a liquid tubing coupled to a vapor tubing, a sub-surface portion of the liquid tubing together with a sub-surface portion of the vapor tubing defining an exterior geothermal heat exchanger;a refrigerant disposed in the refrigerant tubing;an accumulator having an accumulator inlet fluidly communicating with the refrigerant tubing and an accumulator outlet;a first compressor having a first compressor suction line fluidly communicating with the accumulator and a first compressor discharge line;an initial oil charge equal to a factory recommended volume of oil for the first compressor;an oil separator having a top portion defining an inlet fluidly communicating with the first compressor outlet and a bottom portion configured to collect oil, the oil separator further having a refrigerant outlet, the oil separator being configured to separate at least approximately 98% of entrained oil from the refrigerant;an oil return line fluidly communicating between the oil separator bottom portion and the first compressor suction line;an interior heat exchanger disposed in the refrigerant tubing and having a first end fluidly communicating with the refrigerant outlet of the oil separator and a second end fluidly communicating with the exterior geothermal heat exchanger;a U bend disposed in the accumulator and fluidly communicating with the first compressor suction line, the U bend including a base portion defining a hole; andan additional oil charge disposed in the accumulator and having a volume sufficient to submerge the hole in the base portion of the U bend. 10. The direct exchange geothermal heat pump system of claim 9, further comprising a second compressor having a second compressor suction line fluidly communicating with the first compressor discharge line, and a second compressor discharge line, in which the oil separator inlet fluidly communicates with the second compressor outlet, and in which the initial oil charge is equal to a factory recommended volume of oil for both the first and second compressors. 11. The direct exchange geothermal heat pump system of claim 9, in which the oil separator comprises an oil filter having an efficiency of at least approximately 98%. 12. The direct exchange geothermal heat pump system of claim 9, in which the oil return line communicates directly between the oil separator bottom portion and the first compressor suction line. 13. The direct exchange geothermal heat pump system of claim 9, in which the oil return line communicates directly between the oil separator bottom portion and the accumulator. 14. The direct exchange geothermal heat pump system of claim 9, in which the sub-surface portion of the liquid tubing and the sub-surface portion of the vapor tubing extend substantially vertically. 15. The direct exchange geothermal heat pump system of claim 9, in which the exterior geothermal heat exchanger extends at least 100 feet below a ground surface. 16. The direct exchange geothermal heat pump system of claim 9, in which the accumulator holds a volume of liquid refrigerant, and in which the vapor tubing extends into the accumulator to define a distal open end disposed below a surface of the volume of liquid refrigerant. 17. The direct exchange geothermal heat pump system of claim 9, further comprising: a fixed orifice pin restrictor disposed in the oil return line, the fixed orifice pin restrictor having a pin size diameter sized according to a compressor capacity as follows: for compressor capacities up to 12,000 BTU, the pin size diameter is equal to approximately 0.003225 inches for each 1,000 BTU of compressor capacity; andfor compressor capacities above 12,000 BTU, the pin size diameter is equal to approximately 0.039 inches plus approximately 0.000216 inches for each 1,000 BTU of compressor capacity above 12,000 BTU.
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이 특허에 인용된 특허 (98)
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Bussjager Ruddy C. (Chittenango NY) McKallip James M. (Pompey NY) Miller Lester N. (East Syracuse NY), High latent refrigerant control circuit for air conditioning system.
Baker Edward R. (22051 South Ave. Corning CA 96021), Method and apparatus for precooling water supplied to an evaporative cooler with a subterranean heat exchanger.
Schooley, Donald L.; Cavestri, Richard C.; Nemeth, Don Richard, Method and apparatus for testing the acidity of a lubricant in a climate control system.
Mogensen Palne (Emblavgen 29 S-182 63 Djurscholm SEX), Method and means for applying a heat exchanger in a drill hole for the purpose of heat recovery or storage.
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