期刊
INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID
卷 103, 期 -, 页码 243-252出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijrefrig.2019.03.038
关键词
Carbon dioxide; Isobutane; Natural refrigerants; Heat transfer; Dry ice; Sublimation
资金
- Faculty of Building Services, Hydro and Environmental Engineering, Warsaw University of Technology [504/02101/1110/42.000100, 504/02646/1110/42.000100]
Carbon dioxide, a natural refrigerant, is attracting attention as a direct solution to the legal restrictions on hydrofluorocarbon (HFC) refrigerants. The use of carbon dioxide as a refrigerant is limited by the triple point temperature of -56.5 degrees C. However, used along with a carrier fluid, carbon dioxide can provide refrigeration to temperatures lower than the triple point. A blend composed of carbon dioxide (R744) and isobutane (R600a) is experimentally studied. An experimental setup was designed, built, and verified in order to obtain the sublimation heat transfer coefficients of R744/R600a mixtures at temperatures lower than -56.5 degrees C. The test section comprises a horizontal copper tube with an inner diameter of 10 mm and length of 1 m. The tube is electrically heated by a copper wire heater wrapped uniformly around the tube. The tests were conducted with a novel refrigerant blend at heat fluxes from 3630 W m(-2) to 8480 W m(-2). The heat transfer coefficient decreases with increasing heat flux. Furthermore, a heat transfer coefficient calculation correlation has been developed. (C) 2019 Elsevier Ltd and IIR. All rights reserved.
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