流水式量热计温度测量技术研究

Temperature measurement technology research for water-flowing calorimeters

在流水式量热计中温度传感器无法实时地反映流水温度变化,为了达到准确测量能量的目的,必须保证对应的温度积分值基本不受传感器响应时间的影响。为此建立了温度传感器的热模型,深入研究了水流温度在稳态和动态条件下温度传感器响应特性及其对温度积分值的影响,得出了在准稳态下,温度的积分值基本不受响应时间影响的结论。提出了一种采用强制热交换方式加快水流热交换,使得水流温度快速达到准稳态的方法,此方法在新型量热计系统中得到成功应用,并取得较好的效果,这也为其它类似积分型测量系统提供一个很好的借鉴,具有广阔的应用前景。

At present the temperature sensor in water-flowing calorimeters couldn＇t measure real-time water temperature. In order to measure the accurate energy, the corresponding temperature integral mustn＇t be affected by the response time of temperature sensors. The heat model of temperature sensor was established and the response characteristics of temperature sensors in the condition of dynamic or static water temperature were studied deeply. The results showed the corresponding temperature integral wouldn＇t be affected in the condition of quasi static water temperature. One method to make the water temperature get quasi static was suggested. In this method, compulsive heat transfer method was used to accelerate the water heat transfer, which was applied in the new calorimeters successfully and the application results were perfect. Thus, it was an important reference for other similar integral measure systems. All the above indicated its good prospect.