| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an environmental testing apparatus having a coldness storage device with high cold reserving ability, and to provide a coldness storage device. Ž<P>SOLUTION: The temperature of a low-temperature tank 6 is lowered to a pre-cooling temperature of -75°C. At this time, an ethanol aqueous solution whose freezing point is -70°C in a coldness storage device 20 freezes. Thereafter, the apparatus shifts the step to a low-temperature exposure step of controlling the air in a test area 7 and the air in the low-temperature tank 6 to a low-temperature exposure temperature of -65°C. When the temperature becomes higher than -70°C in the process of changing the temperature of the low-temperature tank 6 from the pre-cooling temperature to the low-temperature exposure temperature, the ethanol aqueous solution starts to melt. Therefore, the calorie absorbed by the ethanol aqueous solution is increased because the melting heat is available in addition to the stored heat of heat capacity. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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