Experimental study of the heat transfer in R744/R600a mixtures below the R744 triple point temperature

Michał Sobieraj , Marian Rosiński

Abstract

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 °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 °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.
Author Michał Sobieraj (FEE / DHV)
Michał Sobieraj,,
- Department of Heating and Ventilation
, Marian Rosiński (FEE / DHV)
Marian Rosiński,,
- Department of Heating and Ventilation
Other language title versionsÉtude expérimentale du transfert de chaleur dans les mélanges R744/R600a en dessous de la température du point triple du R744
Journal seriesInternational Journal of Refrigeration-Revue Internationale Du Froid, ISSN 0140-7007, (A 40 pkt)
Issue year2019
Vol103
Pages243-252
Publication size in sheets0.5
Keywords in EnglishCarbon dioxide, Isobutane, Natural refrigerants, Heat transfer, Dry ice, Sublimation
Keywords in original languageDioxyde de carbone, Isobutane, Frigorigènes naturels, Transfert de chaleur, Glace sèche, Sublimation
ASJC Classification2210 Mechanical Engineering; 2215 Building and Construction
DOIDOI:10.1016/j.ijrefrig.2019.03.038
URL https://www.sciencedirect.com/science/article/pii/S0140700719301379?dgcid=author
Languageen angielski
File
1-s2.0-S0140700719301379-main.pdf 2.07 MB
Score (nominal)40
ScoreMinisterial score = 40.0, 06-06-2019, ArticleFromJournal
Publication indicators Scopus SNIP (Source Normalised Impact per Paper): 2016 = 1.598; WoS Impact Factor: 2017 = 3.233 (2) - 2017=3.328 (5)
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