研究了1台在给定时间内达到-30℃的低温型试验用小型制冷低温试验箱, 该试验箱配有全自动的微机控制系统能完成各项试验的数据记录。主要针对低温箱围护结构 (隔热层) 在降温阶段非稳态传热特性进行了实验研究。通过试验数据分析, 对隔热层在降温过程的一维大平板非稳态传热问题进行了内部温度场随时间变化关系的的讨论, 同时对低温箱隔热层随时间变化的放热量进行了数据拟合并得出了简化公式, 为这类有特殊要求的制冷装置在节能节材方面的设计提供了的一定的参考数据。
The design of a low temperature test chamber was required to be dropped to-30 ℃ in a given time.The air temperature could be stabilized at a set value through computer control system.After assembling the low test unit, several experiments were carried out for study the unsteady heat transfer characteristics on the chamber insulating layer.As the analysis of experiment date, the change of the heat load from the insulating structure with the time could be expressed by exponential predigest form and the interior temperature field was discussed for this one-dimension plate heat transfer problem.
