Measurements of isobaric heat capacity of R143a and R227ea at liquid phase by quasi-steady scanning

Publication date: Available online 16 November 2019Source: Thermochimica ActaAuthor(s): Yi-jian He, Shu-peng Zheng, Guang-ming ChenAbstractA modified heat conduction calorimeter was developed and utilized in experiments using a quasi-scanning method. The isobaric heat capacities of R143a and R227ea in the liquid phase were measured at a maximum pressure over 5 MPa and temperatures of 310.15 K-365.15 K, respectively. The relatively expanded uncertainties of the measurements were estimated to be 0.030 and 0.029 for R143a and R227ea, respectively.The measurements resulted in 27 data points for R143a and 53 data points for R227ea. All experimental data were correlated with an empirical equation. The equations showed AAD% (Average Absolute Deviations (%)) of 0.32% and 0.27% between the experimental and calculated values of the correlated equations for R143a and R227ea, respectively. In addition, the MAD% (Maximum Absolute Deviations (%)) for R143a and R227eawere 1.01% and 1.14%, respectively. Heat capacity values of R143a and R227ea in the saturated liquid state were obtained by extrapolation of the correlated equations. Furthermore, comparisons were drawn between the measured values and those reported in literature.

Source: Thermochimica Acta - November 17, 2019 Category: Chemistry Source Type: research