TY - JOUR
T1 - An Experiment on the Heat Transfer to Substitute Refrigerant HFC134a Evaporating in a Horizontal Smooth Tube
AU - Takamatsu, Hiroshi
AU - Momoki, Satoru
AU - Hiraoka, Susumu
AU - Nakada, Haruo
AU - Koyama, Shigeru
AU - Fujii, Tetsu
PY - 1991
Y1 - 1991
N2 - An experiment is performed on the heat transfer to CFC12 and its alternative HFC134a evaporating in a 6m-long, 7.9mm-ID smooth tube. A double-tube-type evaporator, where heating water flows countercurrently, is used as the test section. A comparison of measured local heat transfer coefficient between HFC134a and CFC12 is made by adjusting the heat flux distributions for both fluids. Also, by a comparison between both fluids in heat transfer coefficient vs heat flux diagrams, the heat transfer coefficient of HFC134a is shown to be about 25% higher than that of CFC12 for the same saturation temperature, mass velocity, heat flux and quality. Correlations proposed by Dhar et al. and Yoshida et al. also give a higher heat transfer coefficient for HFC134a than that of CFC12, although the difference is a little smaller than that of the experimental results. From the standpoint of the heat transfer in the evaporator, HFC134a is adequate as an alternative working fluid for CFC12.
AB - An experiment is performed on the heat transfer to CFC12 and its alternative HFC134a evaporating in a 6m-long, 7.9mm-ID smooth tube. A double-tube-type evaporator, where heating water flows countercurrently, is used as the test section. A comparison of measured local heat transfer coefficient between HFC134a and CFC12 is made by adjusting the heat flux distributions for both fluids. Also, by a comparison between both fluids in heat transfer coefficient vs heat flux diagrams, the heat transfer coefficient of HFC134a is shown to be about 25% higher than that of CFC12 for the same saturation temperature, mass velocity, heat flux and quality. Correlations proposed by Dhar et al. and Yoshida et al. also give a higher heat transfer coefficient for HFC134a than that of CFC12, although the difference is a little smaller than that of the experimental results. From the standpoint of the heat transfer in the evaporator, HFC134a is adequate as an alternative working fluid for CFC12.
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U2 - 10.1299/kikaib.57.682
DO - 10.1299/kikaib.57.682
M3 - Article
AN - SCOPUS:0026108063
VL - 57
SP - 682
EP - 686
JO - Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
JF - Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
SN - 0387-5016
IS - 534
ER -