Invention Grant
- Patent Title: Refrigeration system having variable speed fan
- Patent Title (中): 具有变速风扇的制冷系统
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Application No.: US10602114Application Date: 2003-06-23
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Publication No.: US06968708B2Publication Date: 2005-11-29
- Inventor: Sivakumar Gopalnarayanan , Yu Chen , Tobias Sienel , Lili Zhang
- Applicant: Sivakumar Gopalnarayanan , Yu Chen , Tobias Sienel , Lili Zhang
- Applicant Address: US NY Syracuse
- Assignee: Carrier Corporation
- Current Assignee: Carrier Corporation
- Current Assignee Address: US NY Syracuse
- Agency: Carison, Gaskey & Olds
- Main IPC: F25B9/00
- IPC: F25B9/00 ; F25D17/02

Abstract:
A transcritical refrigeration system includes a compressor, a gas cooler, an expansion device, and an evaporator. Refrigerant is circulated though the closed circuit system. Preferably, carbon dioxide is used as the refrigerant. A fan moves outdoor air that exchanges heat with the refrigerant across the evaporator. The speed of the fan is regulated to regulate the evaporator pressure and to adapt the evaporator to different environmental conditions to achieve the optimal coefficient of performance. During high ambient conditions, the fan speed is decreased, decreasing the refrigerant mass flowrate in the system. The energy exchange per unit mass of the refrigerant in the gas cooler increases and the work of the fan decreases, increasing the coefficient of performance of the system. During low ambient conditions, the mass flowrate of the system is low and there is more heat transfer thermal resistance on the refrigerant side at the evaporator. The speed of the fan is lowered to decrease the work of the fan. Therefore, the coefficient of performance increases.
Public/Granted literature
- US20040255603A1 Refrigeration system having variable speed fan Public/Granted day:2004-12-23
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