宽温域空气温湿度测量系统设计及试验验证

Wide temperature range air temperature and humidity measurement system design and experimental verification

针对干湿球法低温不适用性、电子式湿度传感器难以长期稳定及经济测量的问题,提出一种空气温湿度测量系统方案,用于解决宽温域尤其是低温条件下的温湿度一体化高精确度测量的难题。基于等湿加热原理,阐述测量系统方案和装置设计,开展变工况的温湿度测量试验研究,并与现有测量方法对比,得到如下结论:相对湿度的最大偏差为1.92%,湿球温度的最大偏差为0.09℃,比焓的最大偏差为1.59%或0.01 kJ/kg,系统响应及时,无明显的迟滞现象,满足制冷空调产品性能检测的环境温湿度测控要求。测量装置操作简单,易于计量校准,投资和维护成本较低,具有较高的实用价值。

In view of the low temperature inapplicability of the dry and wet bulb hu-midity method,and the difficulty of long-term stability and economic measurement of the electronic humidity sensor,a measurement system scheme of air temperature and humidity is proposed to solve the problem of high accuracy measurement of temperature and humidity integration in wide temperature range,especially in low temperature condi-tions.According to the principle of constant humidity heating,the measurement system scheme and device design are described,the experimental study on the temperature and humidity measurment is conducted under variable conditions and compared with the exist-ing test methods,the following conclusions are obtained:the maximum deviation of rela-tive humidity is 1.92%,the maximum deviation of wet bulb temperature is 0.09℃,and the maximum deviation of specific enthalpy is 1.59%or less than 0.01 kJ/kg.The system response is timely and there is no obvious hysteresis phenomenon,which meets the re-quirements of environmental temperature and humidity measurement and control for per-formance detection of refrigeration and air-conditioning products.The test device has the advantages of simple operation,easy measurement and calibration,low investment and maintenance cost,and high practical value.