Patent ID: 7370484
Filing Date: 2008-05-13
Classification: B01D,F25B,F28D

Abstract:
1. A refrigerated compressed gas dryer variable evaporator control method comprising: a. introducing compressed gas at a first temperature through a first flow path in a heat exchanger; b. circulating a refrigerant through a second flow path in said heat exchanger, said refrigerant having a second temperature measured at a refrigerant inlet of said heat exchanger, said second temperature being less than said first temperature; c. cooling said compressed gas to a third temperature as it flows through said heat exchanger; d. controlling said second temperature responsive to changes in said third temperature to generally maintain said third temperature at a desired value; e. sensing a fourth temperature at a single location in said heat exchanger at which said fourth temperature is representative of said third temperature when a compressed gas load is above a certain level, and representative of said second temperature when said compressed gas load is below said certain level; and f. controlling said second temperature responsive to changes in said fourth temperature to generally maintain said fourth temperature at said desired value.