IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0132384
(2008-06-03)
|
등록번호 |
US-7849701
(2011-02-10)
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발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
2 인용 특허 :
19 |
초록
▼
A refrigeration system includes a primary loop that cools a secondary loop that circulates a coolant through a refrigeration load. The secondary loop includes a suction header to receive the coolant from the load, and a discharge header to direct the coolant to the heat exchanger, and a pump to pump
A refrigeration system includes a primary loop that cools a secondary loop that circulates a coolant through a refrigeration load. The secondary loop includes a suction header to receive the coolant from the load, and a discharge header to direct the coolant to the heat exchanger, and a pump to pump the coolant from the suction to the discharge header. A charging loop maintains a pressure of the coolant in the supply header within a predetermined range, and includes an inlet from the discharge header and an outlet to the suction header. A flow nozzle and a valve are located between the inlet and the outlet, and a reservoir of make-up coolant communicates with the flow nozzle. Upon a low pressure condition in the suction header, the valve opens to permit flow of coolant through the flow nozzle to draw in make-up coolant from the reservoir.
대표청구항
▼
What is claimed is: 1. A refrigeration system, comprising: a primary refrigeration loop configured to circulate a refrigerant through a first side of at least one heat exchanger; a secondary cooling loop configured to circulate a liquid coolant through a second side of the heat exchanger and throug
What is claimed is: 1. A refrigeration system, comprising: a primary refrigeration loop configured to circulate a refrigerant through a first side of at least one heat exchanger; a secondary cooling loop configured to circulate a liquid coolant through a second side of the heat exchanger and through at least one refrigeration load; the secondary cooling loop including a suction header configured to receive the liquid coolant from the refrigeration load, and a discharge header configured to direct the liquid coolant to the heat exchanger, and at least one pump configured to pump the liquid coolant from the suction header to the discharge header; and a charging loop configured to maintain a pressure of the liquid coolant in the supply header within a predetermined range, the charging loop comprising: an inlet coupled to the discharge header and an outlet coupled to the suction header; a flow nozzle disposed between the inlet and the outlet, a valve disposed between the inlet and the outlet, and operable for movement between an open position to permit flow of liquid coolant through the flow nozzle, and a closed position to prevent flow of liquid coolant through the flow nozzle; and a primary reservoir for containing liquid coolant and communicating with the flow nozzle. 2. The refrigeration system of claim 1, wherein the charging loop further comprises a supply line coupled to the primary reservoir and the flow nozzle, and configured to deliver liquid coolant from the primary reservoir to the flow nozzle. 3. The refrigeration system of claim 2, wherein the charging loop further comprises a pressure sensing device operable to monitor a pressure of the liquid coolant in the suction header and to provide an output signal operable to move the valve to the open position when the pressure of the liquid coolant in the supply header decreases to a predetermined low pressure setpoint. 4. The refrigeration system of claim 3, wherein the pressure sensing device is operable to move the valve to the closed position when the pressure of the liquid coolant in the supply header increases to a predetermined high pressure setpoint. 5. The refrigeration system of claim 4, wherein the charging loop further comprises a level sensing device operable to monitor a level of liquid coolant in the primary reservoir and to prevent the valve from moving to the open position when the level of liquid coolant in the primary reservoir decreases to a predetermined low level setpoint. 6. The refrigeration system of claim 2, wherein the charging loop further comprises a secondary reservoir for containing liquid coolant, the secondary reservoir communicating with the supply line. 7. The refrigeration system of claim 6, wherein the charging loop further comprises a level sensing device operable to monitor a level of liquid coolant in the primary reservoir and to provide a signal operable to permit liquid coolant from the secondary reservoir to be supplied to the flow nozzle when the level of liquid coolant in the primary reservoir decreases to a predetermined low level setpoint. 8. The refrigeration system of claim 6, wherein the flow nozzle comprises a venturi nozzle configured to draw liquid coolant from one of the primary reservoir and the secondary reservoir when the valve is moved to the open position. 9. The refrigeration system of claim 1, wherein the pressure sensing device comprises a pressure switch and the valve comprises a solenoid-operated valve. 10. A refrigeration system, comprising: a heat exchanger configured to provide cooling to a liquid coolant; a cooling loop configured to circulate the liquid coolant through the heat exchanger and through at least one refrigeration device; the cooling loop including a suction line configured to receive the liquid coolant from the refrigeration device, and a discharge line configured to direct the liquid coolant to the heat exchanger, and at least one pump configured to pump the liquid coolant from the suction line to the discharge line; and a charging loop configured to maintain a pressure of the liquid coolant in the supply line within a predetermined range, the predetermined range defined by a low pressure setpoint and a high pressure setpoint, the charging loop comprising: an inlet coupled to the discharge line and an outlet coupled to the suction line; a venturi nozzle disposed between the inlet and the outlet, a valve disposed between the inlet and the outlet, and positionable in an open position to permit flow of liquid coolant through the venturi nozzle, and a closed position to prevent flow of liquid coolant through the venturi nozzle; a reservoir configured to provide an auxiliary supply of liquid coolant to the venturi nozzle; and a control system operable to monitor a pressure of the liquid coolant in the supply line and to open the valve when the pressure of the liquid coolant in the supply line decreases to the low pressure setpoint, so that liquid coolant flows from the discharge line to the supply line and draws the auxiliary supply of liquid coolant through the venturi nozzle and into the suction line. 11. The refrigeration system of claim 10 wherein the reservoir comprises a primary reservoir and a secondary reservoir. 12. The refrigeration system of claim 11 wherein the control system is operable to direct the auxiliary liquid coolant from the primary reservoir to the venturi nozzle when a level of the auxiliary liquid coolant in the primary reservoir is above a predetermined low level setpoint, and to direct the auxiliary liquid coolant from the secondary reservoir when the level of the auxiliary liquid coolant in the primary reservoir is below the predetermined low level setpoint. 13. The refrigeration system of claim 10, wherein the control system is operable to close the valve when the pressure of the liquid coolant in the supply line increases to the high pressure setpoint. 14. A refrigeration system, comprising: a cooling loop configured to circulate a liquid coolant through a plurality of refrigeration devices to provide cooling to the refrigeration devices; the cooling loop including a suction line configured to receive the liquid coolant from the refrigeration devices, and a discharge line configured to direct the liquid coolant to the refrigeration devices, and at least one pump configured to pump the liquid coolant from the suction line to the discharge line; and a charging line operable to maintain a pressure of the liquid coolant in the supply line within a predetermined range, the predetermined range defined by a predetermined low pressure and a predetermined high pressure, the charging line comprising: an inlet configured to receive liquid coolant from the discharge line and an outlet configured to supply liquid coolant to the suction line; a venturi nozzle disposed between the inlet and the outlet, a valve disposed between the inlet and the outlet; a reservoir providing an auxiliary supply of liquid coolant to the venturi nozzle; and a control system operable to open the valve when the pressure of the liquid coolant in the supply line decreases to the predetermined low pressure, so that liquid coolant flows from the discharge line to the supply line and draws liquid coolant from the reservoir and through the venturi nozzle and into the suction line. 15. The refrigeration system of claim 14 wherein the reservoir comprises a primary reservoir and a secondary reservoir. 16. The refrigeration system of claim 15 wherein the control system is operable to direct liquid coolant from the primary reservoir to the venturi nozzle when a level of the liquid coolant in the primary reservoir is above a predetermined low level, and to direct liquid coolant from the secondary reservoir when the level of the liquid coolant in the primary reservoir is below the predetermined low level. 17. The refrigeration system of claim 14, wherein the control system is operable to close the valve when the pressure of the liquid coolant in the supply line increases to the predetermined high pressure.
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