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在传热简化估算的基础上,我们给出了一种降温速率可控的装置。这是一种利用漏热法控温的装置。通过一系列的实验,得出当绝热空间的真空度从3。333Pa变到200Pa时,相应的降温速率可从0.0055K/sec变到0.0577K/sec。在上述范围内,降温速率与真空度近似地呈线性关系,由线性关系处理而引起的误差小于±15％。因此,可预先根据降温速率的要求,确定控制参数,可以得到比较满意的结果。 本装置结构及控制方法比较简单方便,稳定性也较好,能满足一般的低温生物试验要求。
Based on the simplified heat transfer estimation, we present a controllable cooling rate device. This is a device that uses temperature-controlled leaks. Through a series of experiments, it is found that the corresponding cooling rate can be changed from 0.0055K / sec to 0.0577K / sec when the vacuum degree of the adiabatic space changes from 3.333Pa to 200Pa. Within the above range, the cooling rate is approximately linear with the degree of vacuum and the error caused by the linear relationship is less than ± 15%. Therefore, the cooling rate can be pre-determined according to the requirements of the control parameters can be obtained more satisfactory results. The device structure and control method is relatively simple and convenient, and the stability is also good, which can meet the general requirement of low-temperature biological test.