Heating systems – Automatic control – Heat source is a reverse cycle refrigerating system or heat...
Patent
1998-09-24
2000-08-29
Wayner, William
Heating systems
Automatic control
Heat source is a reverse cycle refrigerating system or heat...
622284, 165240, G05D 2300, F25B 2900
Patent
active
061095338
ABSTRACT:
An air conditioning system includes one outdoor unit and at least one indoor unit connected to each other. The outdoor unit has a variable capacity compressor, a four-way valve, an outdoor heat exchanger, and a refrigerant heater, while the indoor unit has an indoor heat exchanger. A saturation temperature calculator computes the saturation temperature at the refrigerant heater outlet pressure. A refrigerant heater outlet temperature detection circuit detects the refrigerant temperature near the refrigerant heater outlet. A superheating calculator calculates refrigerant superheating at the refrigerant heater outlet based on values supplied thereto from the refrigerant heater outlet temperature detection circuit and saturation temperature calculator. A compressor frequency control circuit then adjusts the compressor frequency so that the calculated refrigerant superheating is maintained at a specific level.
REFERENCES:
patent: 5231845 (1993-08-01), Sumitani et al.
patent: 5605053 (1997-02-01), Otori
Ao Takahiko
Ishikawa Norimasa
Nakatani Kazuhito
Nishihara Yoshikazu
Uchiyama Kuniyasu
Matsushita Electric - Industrial Co., Ltd.
Wayner William
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