Sublimation defrosting method, sublimation defrosting device, and cooling device

A sublimation defrosting device for removing a frost layer adhering to a cooling surface for cooling a to-be-cooled gas;

• the device comprising:
• a heating/temperature-rising part configured to heat an adhesion portion of the cooling surface, to which the frost layer adheres, to rise a temperature of the adhesion portion, with a heat source located on an adhesion portion side with respect to the frost layer;
• and
• a cooling part disposed to face the adhesion portion and configured to cool the tip-side region of the frost layer,
• wherein the sublimation defrosting device is configured such that the heating/temperature-rising part rises the temperature of the adhesion portion under a temperature condition below a melting point of the frost layer while the cooling part cools the tip-side region of the frost layer to form a temperature gradient from a root-side region to a tip-side region of the frost layer.

A sublimation defrosting method for removing a frost layer adhering to a cooling surface for cooling a to-be-cooled gas;

• the method comprising
• a heating/temperature-rising step of heating an adhesion portion of the cooling surface, to which the frost layer adheres, to rise a temperature of the adhesion portion by a heat source located on an adhesion portion side with respect to the frost layer, under a temperature condition below a melting point of the frost layer,
• wherein the heating/temperature-rising step is performed by a heating/temperature- rising part,
• the temperature of the adhesion portion is detected by a temperature sensor,
• a detection value of the temperature sensor is input into a control part, the control part operates the heating/temperature-rising part so as to rise the temperature of the adhesion portion under the temperature condition below the melting point of the frost layer and form a temperature gradient from a root-side region to a tip-side region of the frost layer, the control part controls the heating/temperature-rising part such that the frost layer has a temperature distribution in which a top of the frost layer has a temperature lower than the adhesion portion and the frost layer has a region whose temperature is lower than the tip of the frost layer, during transient change due to heating and temperature-rising caused by the heating/temperature-rising part.