標題: An overview for the heat transfer performance of HFO-1234yf
作者: Wang, Chi-Chuan
機械工程學系
Department of Mechanical Engineering
關鍵字: HFO-1234yf;R-134a;Two-phase heat transfer coefficient;Pressure drop;Flow pattern
公開日期: 1-三月-2013
摘要: This study provides an overview about the two-phase heat transfer performance for HFO-1234yf which is made to substitute R-134a. Based on the limited information, it is found that the nucleate boiling heat transfer coefficient (HTC) and convective boiling HTC for HFO-1234yf are comparable to R-134a provided q < 200 kW m(-2). The critical heat flux for HFO-1234yf is about 20-40% lower than that of R-134a. For external condensation, the only database shows that the HTC between HFO-1234yf and R-134a is also negligible. However, it is found that the major thermophysical properties influencing condensing HTC suggest a lower HTC of HFO-1234yf For in-tube condensation, it is found that the condensation HTCs for HFO-1234yf are inferior to those of R-134a, and the difference increases with the rise of vapor quality. The predictive correlations applicable for pressured drop for HFO-1234yf are not consistent, it is probably attributed to the difference in tube diameter in the publications. (C) 2012 Elsevier Ltd. All rights reserved.
URI: http://dx.doi.org/10.1016/j.rser.2012.11.049
http://hdl.handle.net/11536/21193
ISSN: 1364-0321
DOI: 10.1016/j.rser.2012.11.049
期刊: RENEWABLE & SUSTAINABLE ENERGY REVIEWS
Volume: 19
Issue: 
起始頁: 444
結束頁: 453
顯示於類別:期刊論文


文件中的檔案:

  1. 000314905000033.pdf