Refrigeration system and a thermostatic expansion valve best sui

Details Refrigeration system and a thermostatic expansion valve best sui Refrigeration system and a thermostatic expansion valve best sui

1989-03-10

1990-12-25

Tapolcai, William E.

Refrigeration

Automatic control

Refrigeration producer

236 92B, F25B 4104

Patent

active

049793721

ABSTRACT:
In a control method for a refrigeration system having a compressor, a condenser, a thermostatic expansion valve, and an evaporator, the amount of a refrigerant flowing into the evaporator is increased at a temperature lower than a predetermined evaporating temperature by a thermostatic expansion valve which opens even if the evaporating temperature is lower than the predetermined level and a superheat signal is lower than 0. In a thermostatic expansion valve best suited for the above method, either a gas adsorbent and at least two working fluids, different in a temperature-induced change of the amount of adsorption to the gas adsorbent, or a first working fluid, whose saturated vapor pressure is lower than the superheated vapor pressure of the refrigerant at the outlet of the evaporator, and a second working fluid incapable of being liquefied within the range of the evaporating temperature of the refrigerant, are sealed in the thermotube. The pressure of the working fluids in the thermo-tube becomes greater than a resultant force to be resisted, thereby moving a valve body to an open position, when the evaporating temperature of the refrigeration system is lower than a predetermined value and also when a difference between the superheated vapor temperature detected by the thermo-tube and the evaporating temperature of the refrigerant, that is a superheat, becomes lower than 0 degrees K.

REFERENCES:
patent: 866886 (1907-09-01), Ricketts
patent: 1925530 (1933-09-01), Gotthardt
patent: 2116802 (1938-05-01), Shivers
patent: 2577903 (1951-12-01), McGrath
patent: 2938384 (1960-05-01), Soreng et al.
patent: 4428718 (1984-01-01), Skinner
patent: 4819443 (1989-04-01), Watanabe et al.

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