Refrigeration – Automatic control – Refrigeration producer
Patent
1989-05-01
1990-03-27
Wayner, William E.
Refrigeration
Automatic control
Refrigeration producer
62227, 622284, F25B 100
Patent
active
049109685
ABSTRACT:
A refrigerating apparatus has a refrigerating cycle including an electromotive compressor whose operational speed is variable in accordance with a drive frequency, and a control unit for operating the compressor at a frequency correspondent to a load so as to control the operation of the refrigerating cycle. Control of the operational frequency of the compressor by the control unit is effected on the basis of target super heat amounts of a discharged gas which is predetermined over an operational frequency range of the compressor. The target super heat amounts are set such that within a lower region of the operational frequency range, each target amount is larger than a super heat amount at which the maximum refrigeration capability is obtained at each operational frequency, so as to suppress a suction pressure of the compressor within an allowable limit for the compressor.
Takahashi Kenji
Takemoto Hideo
Yamashita Tetsuji
Yoshikawa Tomio
Zushi Shizuo
Hitachi , Ltd.
Wayner William E.
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