n Journal of Emerging Trends in Engineering and Applied Sciences - Experimental investigation of thermal conductivity and thermal diffusivity of new refrigerants blends

Volume 4, Issue 2
  • ISSN : 2141-7016
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This article presents the thermal conductivity and thermal diffusivity of two refrigerants blends undergoing development process. The aim is to investigate and establish these two refrigerant mixtures as atmospheric friendly alternative to R12, which is one of the known ozone depleting refrigerants. The two refrigerants were blended out of two refrigerants (R600a and R134a) already in use as alternative to R12. The two new refrigerants were coded RA1 (50%R600a/50%R134a) and RA2 (70%R600a/30%R134a). Transient Hot Wire (THW) technique was used to measure both the thermal conductivities and thermal diffusivities of these two refrigerants at temperatures range between 300 K and 315 K and pressure ranging between 0.5 to 1.13 MPa. The obtained results were compared with those of R12 under the same experimental conditions. The results show that, the thermal diffusivities of both RA1 and RA2 are higher than that of R12 by 12.56% and 13.38% respectively. Also the thermal conductivities of both RA1 and RA2 were more than that of R12 by 2.9% and 20.68% respectively. These indicated that both refrigerants (RA1 and RA2), in conjunction with earlier investigations, can be used in systems designed for R12.

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