CAJ | 학술논문

测量不确定度对水冷冷水机组的性能检测具有重要意义，本文选取名义制冷量为850kW的水冷冷水机组为研究对象，以GB/T 10870-2014规定的液体载冷剂法和机组热平衡法为主要试验和校核试验方法，建立测量不确定度评定模型，对实测结果的测量不确定度进行了评定，并分析了直接测量参数对不确定度的影响趋势。结果表明：进出口水温是影响测量不确定度评定的最主要因素，在温度测量系统精度为0.05℃、流量测量系统精度为0.5%时，进出口水温对合成标准不确定度的分项占比高达67.5%，如果将测温精度分别更改为0.08℃和0.1℃，则主侧制冷量的相对不确定度将从1.8%提升到2.7%和3.3%，辅侧制冷量的相对不确定度将从2.2%提升到3.4%和4.2%。
측량불학정도대수랭랭수궤조적성능검측구유중요의의，본문선취명의제랭량위850kW적수랭랭수궤조위연구대상，이GB/T 10870-2014규정적액체재랭제법화궤조열평형법위주요시험화교핵시험방법，건립측량불학정도평정모형，대실측결과적측량불학정도진행료평정，병분석료직접측량삼수대불학정도적영향추세。결과표명：진출구수온시영향측량불학정도평정적최주요인소，재온도측량계통정도위0.05℃、류량측량계통정도위0.5%시，진출구수온대합성표준불학정도적분항점비고체67.5%，여과장측온정도분별경개위0.08℃화0.1℃，칙주측제랭량적상대불학정도장종1.8%제승도2.7%화3.3%，보측제랭량적상대불학정도장종2.2%제승도3.4%화4.2%。
Measurement uncertainty is of significance in performance testing for water-cooled chillers. This article selects water cooled chillers with 850kW of nominal cooling capacity as its study objects, and adopts the liquid refrigerant method and the heat balance method as its testing and checking methods in accordance with the provisions of GB/T 10870-2014. Based on the evaluation model, the uncertainty obtained by tests is assessed, and the effect of trends of all di-rect measured parameters on uncertainty are also analyzed. The results show that the inlet/outlet water temperature is the most important factor affecting uncertainty measurement. When the precision of temperature and flow rate measuring is 0.05℃ and 0.5% respectively, the inlet/outlet water temperature contributes up to 67.5% to the combined standard uncer-tainty. If the temperature measuring precision is modified to 0.08℃or 0.1℃, the uncertainty of evaporator cooling capacity will increase from 1.8% to 2.7% or 3.3%, and that of condenser cooling capacity will increase from 2.2% to 3.4% or 4.2%.