Investigation on Liquid Density Data at the Bubble Point and Equations for the Refrigerant HFC-404A over a Wide Temperature Range

Abstract

Liquid density data at the bubble point of the refrigerant HFC-404A were measured at temperatures from (227 to 341) K. The experimental method used for this work was the single-cycle method. Liquid density experimental data of HFC-404A were correlated by the VDNS-type and the modified Rackett-type density equations, and the corresponding parameters for the density equations were given. The correlated results show that they agreed well with the experimental data. The absolute values of the average relative deviations of liquid density from the VDNS-type density equation and the modified Rackett-type density equation were 0.10 % and 0.09 %, respectively. Meanwhile, the experimental results were compared with the calculated results from the equation by Lemmon, the results showed that the experimental data agreed well with the calculated results from Lemmon, the absolute value of the average relative density deviations was 0.69 %. In addition, the Peng–Robinson (PR), Patel–Teja (PT), and Soave–Redlich–Kwong (SRK) equations of state were also used to calculate the liquid density of HFC-404A. The absolute values of the average relative liquid density deviations for PR, PT, and SRK equations were 0.87 %, 3.62 %, 7.92 %, respectively, and the absolute values of the maximum relative deviations for PR, PT, and SRK equations were 4.90 %, 6.79 % and 10.20 %, respectively. In actual applications, VDNS-type and modified Rackett-type density equations can be used to calculate the liquid density for HFC-404A with the given coefficients. Also, the equations for PR and PT can easily be used to calculate the liquid and vapor densities of HFC-404A.