Title:
AIR CONDITIONER
Document Type and Number:
Japanese Patent JP3967033
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To reduce energy consumption under the most suitable environment by providing a controller for switching the operation from compression cycle to refrigerant pump cycle when the outdoor temperature is equal to or lower than a set level.
SOLUTION: In the compression cycle, gas refrigerant is pressurized by a compressor 5 and fed to a condenser 8 where the refrigerant is liquefied through heat exchange with outdoor air. The refrigerant is then reduced in pressure through an expansion valve 9 and used for cooling indoor air at an evaporator 4 before being returned back to the compressor 5 while being gasified. In the refrigerant pump cycle, gas refrigerant is delivered from the evaporator 4 to the condenser 8 where it is cooled with low temperature outdoor air and liquefied before being fed to a refrigerant pump 1. Liquid refrigerant is pressurized by the refrigerant pump 1 and introduced to the evaporator 4 where it is used for cooling the indoor air and liquefied refrigerant is returned back to the condenser 8. Outdoor temperature is detected by means of a sensor 15 and when it is lower than a set level, operation is switched from compression cycle to refrigerant pump cycle. A controller 16 makes a decision concerning to the set level of outdoor temperature.
Inventors:
Tsuneo Uekusa
Masahide Yanagi
Yabutani sincerity
Masahide Yanagi
Yabutani sincerity
Application Number:
JP7691799A
Publication Date:
August 29, 2007
Filing Date:
March 19, 1999
Export Citation:
Assignee:
Ntt Facilities Co., Ltd.
International Classes:
F24F11/02; F25B1/00; (IPC1-7): F24F11/02; F25B1/00
Domestic Patent References:
JP10082566A |
Attorney, Agent or Firm:
Masatake Shiga
Tadashi Takahashi
Takashi Watanabe
Masakazu Aoyama
Suzuki Mitsuyoshi
Yutaka Matsutomi
Kazuya Nishi
Yasuhiko Murayama
Mitsuru Oba
Tadashi Takahashi
Takashi Watanabe
Masakazu Aoyama
Suzuki Mitsuyoshi
Yutaka Matsutomi
Kazuya Nishi
Yasuhiko Murayama
Mitsuru Oba
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