IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0248536
(2005-10-12)
|
등록번호 |
US-7290600
(2007-11-06)
|
발명자
/ 주소 |
|
출원인 / 주소 |
- York International Corporation
|
대리인 / 주소 |
McNees Wallace & Nurick LLC
|
인용정보 |
피인용 횟수 :
7 인용 특허 :
35 |
초록
▼
A system for defrosting an air-to-air heat pump system is disclosed. A bypass loop transfers refrigerant at a higher temperature and pressure than is normally cycled through the outdoor unit to an outdoor coil to defrost ice on the outdoor coil. The bypass loop includes a valve movable between close
A system for defrosting an air-to-air heat pump system is disclosed. A bypass loop transfers refrigerant at a higher temperature and pressure than is normally cycled through the outdoor unit to an outdoor coil to defrost ice on the outdoor coil. The bypass loop includes a valve movable between closed and open positions. A sensor monitors a preselected condition indicative of outdoor coil performance. A controller communicates with the valve and the sensor. Once the controller determines that a preselected set point of a preselected condition indicative of deteriorating performance has been reached, the controller sends a signal to open the valve, allowing warm refrigerant to bypass expansion valves and flow to the outdoor unit to defrost the outdoor unit. Once defrosting is accomplished, the valve can be moved to a closed position to resume normal operation of the heat pump unit.
대표청구항
▼
The invention claimed is: 1. A heat pump being reversible between a heating cycle and a cooling cycle, comprising: a compressor; an indoor coil; an outdoor coil; an expansion means between the indoor coil and the outdoor coil, the expansion means being in fluid communication with the indoor coil an
The invention claimed is: 1. A heat pump being reversible between a heating cycle and a cooling cycle, comprising: a compressor; an indoor coil; an outdoor coil; an expansion means between the indoor coil and the outdoor coil, the expansion means being in fluid communication with the indoor coil and the outdoor coil to allow flow of the refrigerant fluid between the indoor coil and the outdoor coil; a sensor for detecting a condition of the outdoor coil and providing a signal indicative of the condition of the outdoor coil; a controller including a predetermined set point and means for receiving the signal indicative of the condition of the outdoor coil, the controller being configured to provide at least one signal when the predetermined set point has been achieved; and a refrigerant bypass circuit between the indoor coil and the outdoor coil, the refrigerant bypass circuit being in fluid communication with the indoor coil and outdoor coil to provide refrigerant from the indoor coil to the outdoor coil at an elevated temperature, the refrigerant bypassing the expansion means, the bypass circuit comprising a valve operable between a first closed position and a second open position in response to the at least one signal from the controller, a refrigerant fluid supply means, the supply means providing refrigerant fluid to the valve from between the compressor and the expansion device, a refrigerant fluid discharge means providing refrigerant discharge fluid passing through the valve to the outdoor coil, the refrigerant from the refrigerant bypass circuit at an elevated temperature defrosting the outdoor coil when the bypass circuit valve is open. 2. The heat pump of claim 1 wherein the sensor detects the temperature within the outside coil. 3. The heat pump of claim 1 wherein the sensor detects the temperature of the ambient air surrounding the outside coil. 4. The heat pump of claim 1 wherein the sensor detects the temperature of the refrigerant fluid at a point between the outdoor coil and the compressor. 5. The heat pump of claim 1 wherein the sensor detects a pressure of the refrigerant fluid between the outdoor coil and the compressor. 6. The heat pump of claim 5 wherein the sensor detects the pressure of the refrigerant fluid as it leaves the outdoor coil. 7. The heat pump of claim 1 wherein the predetermined set point of the controller corresponds to a first temperature, and the controller is configured to provide at least one signal in response to a determination that the first temperature has been achieved in the outdoor coil. 8. The heat pump of claim 7 wherein the at least one signal from the controller causes the valve in the bypass circuit to open, thereby permitting flow of hot refrigerant gas through the bypass circuit to the outdoor coil to defrost the coil. 9. The heat pump of claim 8 wherein the controller further includes a second predetermined set point and is configured to provide a second signal indicative of when the second predetermined set point has been achieved, the second signal causing the valve in the bypass circuit to close, thereby stopping flow of hot refrigerant gas through the bypass loop. 10. The heat pump of claim 9 wherein the second predetermined set point corresponds to a temperature higher than the first temperature. 11. The heat pump of claim 1 wherein the predetermined set point of the controller corresponds to a first pressure, and the controller is configured to provide a signal when the signal from outdoor unit sensor indicates that the first pressure has been achieved. 12. The heat pump of claim 11 wherein the controller, upon receiving the signal that the first pressure has been achieved, provides a first signal from the means for providing at least one signal to cause the valve in the bypass circuit to open, thereby permitting flow of hot refrigerant gas through the bypass circuit to the outdoor coil to defrost the coil. 13. The heat pump of claim 12 wherein the controller further includes a second predetermined set point and is configured to provide a second signal indicative of when the second predetermined set point has been achieved, the second signal causing the valve in the bypass circuit to close, thereby stopping flow of hot refrigerant gas through the bypass loop. 14. The heat pump of claim 13 further including an auxiliary heat source, the auxiliary heat source activated when the bypass circuit is open to defrost the outdoor coil. 15. The heat pump of claim 13 wherein the second predetermined set point corresponds to a pressure higher than the first pressure. 16. The heat pump of claim 1 wherein the refrigerant bypass circuit comprises a bypass line having a first end and a second end, the first end of the bypass line positioned on a discharge line from the compressor, the second end of the bypass line positioned between an inlet line to the outdoor coil and the expansion means, the valve positioned in the bypass line between the first end and the second end. 17. The heat pump of claim 1 further including an auxiliary heat source, the auxiliary heat source operable in response to a signal from the controller when the predetermined set point has been achieved. 18. A heat pump being reversible between a heating cycle and a cooling cycle, comprising: a compressor; an indoor coil; an outdoor coil; an expansion means between the indoor coil and the outdoor coil, the expansion means being in fluid communication with the indoor coil and the outdoor coil to allow flow of the refrigerant fluid between the indoor coil and the outdoor coil; a sensor for detecting a condition of the outdoor coil and providing a signal indicative of the condition of the outdoor coil; a programmable controller including predetermined set points, the controller including means for receiving the signal from the sensor indicative of the condition of the outdoor coil, the controller further being configured to provide signals when the predetermined set points are achieved; means for defrosting the outdoor coil, wherein the means for defrosting the outdoor coil includes a refrigerant bypass circuit that provides hot refrigerant to the outdoor coil at an elevated temperature, the refrigerant bypassing the expansion means, the bypass circuit comprising a valve operable between a first closed position to a second open position in response to a first signal from the controller, and the second open position to the first closed position in response to a second signal from the controller, a refrigerant fluid supply means, the supply means providing hot refrigerant fluid to the valve, the supply means located upstream of the expansion means between the compressor and the expansion means, a refrigerant fluid discharge means providing refrigerant discharge fluid passing through the valve to the outdoor coil, the refrigerant bypass circuit defrosting the outdoor coil when the bypass circuit valve is open; and an auxiliary heat source, the auxiliary heat source being activated in response to a third signal from the controller and inactivated in response to a fourth signal from the controller. 19. The heat pump of claim 18 wherein the means for defrosting the outdoor coil further includes electric heating elements. 20. The heat pump of claim 18 wherein the auxiliary heat source is activated in response to the first signal from the controller and inactivated in response to the second signal from the controller. 21. The heat pump of claim 18 wherein the supply means providing hot refrigerant to the valve is the compressor. 22. A heat pump being reversible between a heating cycle and a cooling cycle, comprising: a compressor; an indoor coil; an outdoor coil; an expansion means between the indoor coil and the outdoor coil, the expansion means being in fluid communication with the indoor coil and the outdoor coil to allow flow of the refrigerant fluid between the indoor coil and the outdoor coil; a sensor for detecting a condition of the outdoor coil and providing a signal indicative of the condition of the outdoor coil; a programmable controller including predetermined set points, the controller including means for receiving the signal from the sensor indicative of the condition of the outdoor coil, the controller further including means for providing signals when the predetermined set points are achieved; and means for defrosting the outdoor coil, wherein the means for defrosting the outdoor coil includes a first refrigerant bypass circuit that provides hot refrigerant from the condenser to the outdoor coil at an elevated temperature, the first refrigerant bypass circuit bypassing the expansion means, the first refrigerant bypass circuit comprising a valve operable between a first closed position to a second open position in response to a first signal from the controller, and the second open position to the first closed position in response to a second signal from the controller, and a second refrigerant bypass circuit that provides hot refrigerant from the compressor to the outdoor coil at an elevated temperature, the second refrigerant bypass circuit bypassing the expansion means, the second refrigerant bypass circuit comprising a valve operable between a first closed position to a second open position in response to a third signal from the controller, and the second open position and the first closed position in response to a fourth signal from the controller. 23. The heat pump of claim 22 further including a second sensor for detecting a condition and for providing a signal indicative of the condition to the controller.
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