Refrigeration – Automatic control – Selective heating or cooling
Patent
1987-06-03
1988-09-20
King, Lloyd L.
Refrigeration
Automatic control
Selective heating or cooling
62204, 623241, 623246, F25B 1300
Patent
active
047716100
ABSTRACT:
A multiroom air conditioner has a plurality of indoor heat exchangers connected to a single outdoor heat exchanger. A reversible expansion valve is installed on a liquid-side branch pipe for each of the indoor heat exchangers, and a solenoid valve is installed on a gas-side branch pipe for each indoor heat exchanger. Temperature sensors are provided on the liquid-side branch pipes, on the gas-side branch pipes, and on the outlet side during cooling of the outdoor heat exchanger. A pressure sensor or a temperature sensor detects the saturation temperature on the high-pressure side of the compressor. Based on the saturation temperature on the high-pressure side of the compressor, the temperature on the outlet side during cooling of the outdoor heat exchanger, and the temperatures in the liquidside branch pipes, a controller controls the expansion valves so as to obtain a target degree of subcooling during cooling and heating. The controller can also control the expansion valves so that the temperatures in each of the branch pipes are approximately equal to one another.
REFERENCES:
patent: 3307368 (1967-03-01), Harnish
patent: 4487031 (1984-12-01), Rogers et al.
patent: 4620423 (1986-11-01), Hopkinson et al.
patent: 4644756 (1987-02-01), Sugimoto et al.
Fukushima Akio
Iijima Hitoshi
Matsuoka Fumio
Nakashima Yasuo
Sakuma Kiyoshi
King Lloyd L.
Mitsubishi Denki & Kabushiki Kaisha
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