REPLENISHMENT METHOD OF REFRIGERANT, REFRIGERANT COMPOSITION, REFRIGERANT LEAKAGE DETECTOR AND FREEZING APPARATUS

摘要

PROBLEM TO BE SOLVED: To restore a refrigerant composition to an initial one in a freezing apparatus using a nonazeotrope refrigerant where two kinds or more of different boiling point refrigerants are mixed detecting leakage of the refrigerant and the composition of a remaining refrigerant, and determining a composition ratio of of the refrigerant replenished on the basis of the composition ratio of the remaining refrigerant for replenishment of the refrigerant. SOLUTION: Estimation means 14 estimates refrigerant temperature Ts predicted about a refrigerant of an initial composition from refrigerant pressure P detected by a refrigerant pressured detector PS, and temperature difference detection means 15 compares the refrigerant temperature Ts with refrigerant temperature T detected by the temperature detector TS to estimate a temperature differenceΔT. A composition of the remaining refrigerant is judged in refrigerant composition judgement means 16 from the temperature differenceΔT. Refrigerant composition difference estimation means 17 compares the refrigerant composition detected by such refrigerant composition detection means 11 with a previuously set refrigerant composition, and refrigerant leakage jugement means 18 judges leakage of the refrigerant, and further proper replenishment of the refrigerant is controlled on the basis of the detection of the leakage of the refrigerant.