Heating and cooling air conditioning system with improved defros

Details Heating and cooling air conditioning system with improved defros Heating and cooling air conditioning system with improved defros

1990-08-15

1992-03-03

Tanner, Harry B.

Refrigeration

Automatic control

Preventing, removing or handling atmospheric condensate

62160, 621964, 62278, 623245, F25B 4702, F25D 2106

Patent

active

050921347

ABSTRACT:
An air conditioning system including a refrigerant circuit having a compressor, a three port switching valve, a four port reversing valve, an outdoor heat exchanger, a first throttle device including a first decompression device, a second throttle device including a first decompression device, an indoor heat exchanger and an accumulator connected in series by use of refrigerant pipes; a first bypass circuit which is constructed to carry out heat exchange with the intake pipe connecting between the accumulator and the compressor, and which is connected as a bypass to the pipe connecting between the first and second throttle devices; a second bypass circuit having a check valve to bypass the first decompression device; a third bypass circuit having a check valve to bypass the second decompression device; a fourth bypass circuit which is connected as a bypass to the pipe between the first and second throttle devices, and which is smaller than the discharge pipe in inside diameter; and a fifth bypass circuit which is connected as a bypass to the pipe between the first and second throttle devices through a pressure regulating valve; wherein the three port switching valve is switched to open the fourth bypass circuit, thereby carrying out defrosting.

REFERENCES:
patent: 3905202 (1975-09-01), Taft et al.
patent: 4389851 (1983-06-01), Chrostowski et al.
patent: 4799363 (1989-01-01), Nakamura
patent: 4831835 (1989-05-01), Beehler et al.
Heat Pump-Practical design and Application by Jatec Press, pp. 120-123, D. A. Reay et al., Jul. 5, 1958.

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