基于液体载冷剂法的空调器性能测量不确定度分析

Uncertainty analysis of air conditioner performance measurement based on liquid secondary refrigerant method

基于液体载冷剂法,应用间接测量参数的不确定度理论,建立了空调器性能参数的标准不确定度计算模型,给出了基于液体载冷剂法性能测量参数的标准不确定度评价方法。以水冷冷水机组综合部分负荷性能系数的标准不确定度评定为例进行分析。结果表明:进出水温度测量引入的标准不确定度对水冷冷水机组的综合部分负荷性能系数影响较大,其次是水流量和功率测量因素;综合部分负荷性能系数的A类标准不确定度远小于B类标准不确定度。因此,在测量水冷冷水机组综合部分负荷性能时,需要重点关注仪器仪表的精度,较高的仪器仪表精度能有效降低水冷冷水机组性能参数的测量不确定度。

Based on the liquid secondary refrigerant method and the uncertainty theory of indirect measurement parameters,the calculation model of standard uncertainty of air conditioner performance parameters is established.The evaluation method of standard uncertainty of performance measurement parameters based on the liquid secondary refrigerant method is given.As an example,the evaluation of standard uncertainty of integrated part load value(IPLV)for water-cooled chillers is analysed.The results show that the standard uncertainty introduced from inlet and outlet water temperature measurement has greater influence on IPLV,followed by water flow and power measurement factors.The type A measurement standard uncertainty of IPLV is much less than the type B measurement standard uncertainty.Therefore,it is necessary to focus on the accuracy of instruments when measuring the IPLV of water-cooled chillers.The higher accuracy of instruments can effectively reduce the measurement uncertainty of performance parameters of water-cooled chillers.