Title:
可変速度ファンを有する冷凍システム
Document Type and Number:
Japanese Patent JP2007524059
Kind Code:
A
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.
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Inventors:
Gopar Narayanan, Shiva Kumar
Chen, You
Siener, Tobias
Zan, Lily
Chen, You
Siener, Tobias
Zan, Lily
Application Number:
JP2006517369A
Publication Date:
August 23, 2007
Filing Date:
June 17, 2004
Export Citation:
Assignee:
CARRIER CORPORATION
International Classes:
F25B1/00; F25B9/00
Domestic Patent References:
| JP2002286307A | 2002-10-03 | |||
| JP2004309027A | 2004-11-04 | |||
| JP2003329313A | 2003-11-19 |
Foreign References:
| WO2003036184A1 | 2003-05-01 |
Attorney, Agent or Firm:
Tsuyoshi Hashimoto
Tomioka Kiyoshi
Tomioka Kiyoshi