Thermal conductivity of refrigerants R123, R134a, and R125 at low temperatures

Equations for the Thermal Conductivity of R-32, R-125, R-134a, and R-143a

“…Data sets of the thermal conductivity of R-32 [4][5][6][7][8][9][10][11][12][13][14], R-125 [4,7,8,10,[12][13][14][15][16][17][18][19][20][21][22][23], R-134a [7,11,15,[24][25][26][27][28][29][30][31][32][33], and R-143a [13,14,30,34,35] considered in the present formulation are listed in Tables I to IV. Experimental data for R-32 are also shown in Fig.…”

Saturated liquid thermal conductivity correlations for some new refrigerants

“…In the case of data of Fellows et al (1990) the deviations are systematic for HCFCs 123, 124 and HFC125 but such a trend is absent in HFC134a. The concentric cylinder method measurements of Tsvetkov et al (1994) show a positive bias for HCFC123 which is absent in the case of HFCs 125 and 134a. The same experimental technique adopted by Grebenkov et al (1994) for HCFCs 125 and 152a shows a considerable negative bias whereas in the case of HFCs 32 and 134a it is not that dominant.…”

“…The differences between the temperature scales IPTS-68 and ITS-90 have been ignored as they are quite small in the temperature range covered in the present study. Fellows et al, 1990;(᭜) Gao et al, 1996;(£) Grebenkov et al, 1994;(᭝) Gross et al, 1990;(᭢) (ᮀ) Tsvetkov et al, 1994;() Wilson et al, 1992; (᭹) Yata et al, 1992 Ro et al, 1995; (᭹) Yata et al, 1996 Table 2 shows that the average deviation for the thermal conductivity is not more than 3)5% and the maximum absolute deviation is less than 9%. The largest deviations are observed in the case of HFCs 125 and 134a.…”

“…Several investigators had provided data along the saturation line (e.g. Assael and Karagiannidis, 1995;Fellows et al, 1990;Gross et al, 1990;Gurova et al, 1994;Hoffman et al, 1996;Kim et al, 1993;Perkins et al, 1992;Ross et al, 1990;Sousa et al, 1992;Tsvetkov et al, 1994;Wilson et al, 1992;Yata et al, 1984). The equations for saturated liquid thermal conductivity given by some investigators were used directly (e.g.…”

“…In some cases systematic deviations are due to use of the equations proposed by Figure 5. Deviation plots for saturated liquid thermal conductivity of HFC134a Legend: (a) (᭡) Gross et al, 1992; (᭝) Gross and Song, 1996;(᭜) Hoffman et al, 1996;() Perkins et al, 1992; ( #) Ro et al, 1995;(᭢) Ross et al, 1990;(ᮀ) Tsvetkov et al, 1994. (b) (᭺) Assael and Karagiannidis, 1995;(᭛) Fellows et al, 1990;(£) Grebenkov et al, 1994;(#) Gurova et al, 1994;() Heide and Lippold, 1990; (᭢) (᭜) Ueno et al, 1990; (᭹) Yata et al, 1989 investigators for extrapolation to the saturation state.…”