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为满足比常规热真空罐快得多的升降温要求,设计和制造了高变温速率的高低温空间环境模拟系统,其特点为舱内非高真空环境,而是充注绝对压力90 kPa氦气,工作温度范围为68—373K。除了有与热真空罐相同的辐射传热,更重要的是允许舱内有自然对流甚至强制对流传热,从而大大加快传热速度,特别是在接近目标温度时明显减少对被测物的冷却或加热时间。这一特性使得该新型高低温系统在结构上存在与常规热真空罐本质的区别。其优点除了升降温速率大外,内部温度均匀性也得到提升。
In order to meet the requirement of heating and cooling much faster than the conventional hot vacuum tank, a simulation system of high and low temperature space environment with high temperature transformation rate is designed and manufactured, which is characterized by non-high vacuum environment in the cabin, but filled with 90 kPa helium , The working temperature range is 68-373K. In addition to having the same radiant heat transfer as the thermal vacuum tank, it is more important to allow natural convection and even forced convection heat transfer within the tank, thus greatly accelerating the heat transfer rate, especially significantly reducing the cooling of the measured object near the target temperature Or heating time. This feature makes the new high temperature system has the structure and the difference between the essence of conventional hot vacuum tank. In addition to its advantages in addition to heating and cooling rate, the internal temperature uniformity has also been improved.