Method for cool drying
AssigneeAtlas Copco Airpower, Naamloze Vennootschap
InventorsWouter Denis Ann Van Dijck, Frederic Daniël Rita Van Nederkassel
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Abstract
Method for cool drying gas containing water vapor, where a gas is led through a secondary part of a heat exchanger, whose primary part is an evaporator of a cooling circuit. The temperature or the dew point is measured in the environment of the place where, when cool drying, the temperature of the gas to be dried is the lowest. The above-mentioned method also has the step of switching off the cooling circuit when the decrease of the lowest measured gas temperature (LAT) or the dew point during a predetermined period of time amounts to less than a preset value (y).
Claims12
A method for cool drying gas comprising the steps:
- leading a gas through a secondary part of a heat exchanger comprising an evaporator of a cooling circuit which includes a compressor that is driven by a motor, a condenser, and an expansion device between an outlet of the condenser and an inlet of the evaporator;
- measuring a temperature or a dew point of the gas in an environment of a place where, when cool drying the gas, the temperature of the gas is the lowest;
- determining a change in a lowest measured gas temperature or the dew point of the gas as a function of time when the cooling circuit is started;
- and switching off the cooling circuit when the change in the lowest measured gas temperature or the dew point over a predetermined period of time is less than a preset value, wherein said predetermined period of time is a fixed period of time;
- and wherein the fixed period of time is defined as at least three successive periods of time.
Dependencies are inferred from the claim text.