Defrosting heater and cold storage

摘要

PROBLEM TO BE SOLVED: To reduce the possibility of ignition upon defrosting in a case where a combustible refrigerant is leaked in a refrigerating system employing the combustible refrigerant.;SOLUTION: In a defrosting heater 18, a first glass tube 29 for containing a heater wire 23 is covered by a second glass tube 30 to obtain a surface temperature not higher than the igniting temperature of the combustible refrigerant and the sectional area of the inner space of the first glass tube 29 is specified so as to be 0.5 mm²-800 mm² while the inner diameter of the second glass tube 30 is specified so as to be 1.5-3 times of the outer diameter of the first glass tube 29 whereby the danger of ignition upon defrosting, when the leakage of the combustible refrigerant happens, can be reduced.;COPYRIGHT: (C)2003,JPO