| Issue |
E3S Web Conf.
Volume 70, 2018
17th International Conference Heat Transfer and Renewable Sources of Energy (HTRSE-2018)
|
|
|---|---|---|
| Article Number | 02011 | |
| Number of page(s) | 7 | |
| Section | Heat Transfer and Heat Exchangers | |
| DOI | https://doi.org/10.1051/e3sconf/20187002011 | |
| Published online | 03 December 2018 | |
Modelling of a two-phase zone during condensation of R1234yf refrigerant in tubular minichannels under periodic dynamic disturbances
Technical University of Koszalin, Department of Energy, av. Raclawicka 15-17, PL 75-620 Koszalin, Poland
* Corresponding author: waldemar.kuczynski@tu.koszalin.pl
The paper presents an experimental analysis of the influence of dynamic disturbances on the size of the condensation zone of the appropriate new R1234yf environment-friendly refrigerant in circular mini-channels. Experimental tests were conducted for single minichanells placed horizontally, with an inner diameter d = {1.44; 2.30; 3.30} mm. A range of frequencies from f = 0.2 - 5 Hz of periodically generated disturbances showed an explicit and unfavourable influence on the decrease of the length of the proper condensation region. This influence reduced the efficiency of the process. A computational model was developed to calculate the length of the two-phase region under disturbance conditions. The model proposed was verified by the results of the experiment, and compliance was obtained in the range of ±25%.
© The Authors, published by EDP Sciences, 2018
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