ISSN:
1572-9567
Keywords:
alternative refrigerants
;
difluoromethane (HFC-32)
;
pentafluoroethane (HFC-125)
;
1,1,1-trifluoroethane (HFC-143a)
;
dichloropentafluoropropanes (HCFC-225ca, HCFC-225cb)
;
liquid phase
;
thermal conductivity
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract Measurements ofthe thermal conductivity of five alternative refrigerants. namely, difluoromethane HFC-321. pentafluoroethane (HFC-125), 1,1,1-trifluoroethane (HFC-143a), and dichloropentafluoropropanes (HCFC-225ca and HCFC-225cb). are carried out in the liquid phase, The range of temperature is 253–324 K for HFC-32, 257–305 K for HFC-125, 268–314 K for HFC-134a. 267–325 K for HCFC-225ca, and 286–345 K for HCFC-225cb, The pressure rank is from saturation to 30 MPa, The reproducibility of the data is better than 0.5% and the accuracy of the data is estimated to be of the order of 1%. The experimental results for the thermal conductivity ofeach substance are correlated by an equation which is a function of temperature and pressure. A short discussion is given to the comparison of the present results with literature values for HFC-125, The saturated liquid thermal conductivity values of HFC-32. HFC-125, and HFC-143a are compared with those of chlorodifluoromethane (HCFC-22) and tetrafluoroethane (HFC-134a) and it is shown that the value of HFC-32 is highest, while that of HFC-125 is lowest, among these substances, The dependence of thermal conductivity on number of fluorine atoms among the refrigerants with the same number of carbon and hydrogen atoms is discussed.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01441503
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