【摘要】 介绍了空气焓差法测量空调制冷量的基本原理,并指出了目前空调制冷量的不确定度评定中存在的问题。考虑到风量、空调出风口焓值、喷嘴前焓湿量等中间变量存在明显的相关性,文中提出了采用直接测量量对空调制冷量求偏导来计算各分量的灵敏系数的方法。并且在明确各分量的标准不确定度的基础上,运用误差传递的原理,全面系统地分析了各分量对空调制冷量的影响,为改善空气焓差法空调制冷量的测试精度及其可靠性提供了指导。更多还原

【Abstract】 This article described the basic principle of air-enthalpy method for testing performance of air conditioners,and pointed out current problems in evaluating the uncertainty of cooling capacity.Considering the correlation among intermediate variables such as the airflow,enthalpy at the outlet of the air conditioner and moisture content before nozzle,we proposed a method to get sensitivity coefficients using the partial derivatives of cooling capacity with respect to each direct measuring variable.Furthermore,we compared the impact of each direct measuring variable on cooling capacity based on the analysis of standard uncertainty in these variables combined with error transfer theory.The experimental and calculating results provide guidance for improving the measurement accuracy and reliability of cooling capacity.更多还原