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Isobaric heat capacity measurements of liquid HFE-7200 and HFE-7500 from 245 to 353 K at pressures up to 15 MPa

机译:在压力高达15 MPa的情况下,液体HFE-7200和HFE-7500的等压热容量从245到353 K

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An adiabatic flow calorimeter was developed for the measurement of the isobaric heat capacity of pure liquids and their mixtures, which could be used over the temperature range of (243-393) K and at pressure up to 20 MPa. The apparatus has been validated by measuring the isobaric heat capacity of pure water at different temperatures and pressures. With the flow calorimeter, the isobaric heat capacity of HFE-7200 (l-ethoxy-1,1, 2,2,3,3,4,4,4-nonafluorobutane, CAS Registry Number: 163702-05-4) and HFE- 7500 (3-ethoxyperfluoro(2-methylhexane), CAS Registry Number: 297730-93-9) were measured in the termperature range from (245 to 353) K and pressure range from (0.1 to 15) MPa. The expanded uncertainty with a level of confidence of 0.95 (k = 2) of the isobaric heat capacity measurement was estimated to be within ±2%, and the repeatability of the experimental data was better than ±1%.
机译:开发了一种绝热流量热量计,用于测量纯液体及其混合物的等压热容量,可在(243-393)K的温度范围内和最高20 MPa的压力下使用。通过在不同温度和压力下测量纯水的等压热容量,已对该设备进行了验证。借助流量热计,可以测量HFE-7200(1-乙氧基-1,1,2,2,3,3,3,4,4,4,4-九氟丁烷,CAS登记号:163702-05-4)和HFE的等压热容-在(245至353)K的温度范围和(0.1至15)MPa的温度范围内测量了7500(3-乙氧基全氟(2-甲基己烷),CAS登记号:297730-93-9)。等压热容测量的置信度为0.95(k = 2)的扩展不确定度估计在±2%以内,实验数据的可重复性优于±1%。

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