Refrigeration – Automatic control – Refrigeration producer
Patent
1990-09-11
1991-09-03
Tapolcai, William E.
Refrigeration
Automatic control
Refrigeration producer
236 92B, 374201, F25B 4104
Patent
active
050441701
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 zero. 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 thermo-tube. 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 zero degrees K.
REFERENCES:
patent: 2787130 (1957-04-01), Kaufman
patent: 2938384 (1960-05-01), Sorenz et al.
patent: 4819443 (1989-04-01), Watanabe et al.
Fujikoki Mfg. Co. Ltd.
Scafetta, Jr. Joseph
Tapolcai William E.
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