HEAT ACCUMULATION QUANTITY OF TWO-DIMENSIONAL COOLING FACILITY UTILIZING HEAT ACCUMULATION OF DRY ICE AND THE TWO-DIMENSIONAL COOLING FACILITY

摘要

PROBLEM TO BE SOLVED: To provide a heat accumulation quantity measuring method that can easily know the heat accumulation quantity in a lower-dimensional evaporator and two-dimensional cooling facilities that use carbon dioxide as a cooling medium in a lower- dimensional refrigerating cycle and accumulates the carbon dioxide in the lower- dimensional evaporator in a mixed state of dry ice and liquefied carbon dioxide. SOLUTION: The liquid level of the lower-dimensional evaporator 23 of the two-dimensional cooling facilities which has a higher-dimensional refrigerating cycle 1 and a lower-dimensional refrigerating cycle 3 and is equipped with the lower-dimensional evaporator 23 in tank structure accumulating the lower-dimensional cooling medium consisting of carbon dioxide in the mixed state of dry ice 5C and liquid 15A is detected, the production mass of the dry ice is found by multiplying the quantity of variation in the detected liquid level in the low-pressure evaporator by the sectional area of the low-pressure evaporator and the density difference between the dry ice and liquefied carbon dioxide, and the production mass of the dry ice is multiplied by the melting heat of the dry ice to find the quantity of heat accumulation in the low-pressure evaporator.