Abstract
Carbon dioxide among natural refrigerants has gained considerable attention as an alternative refrigerant due to its excellent thermophysical properties. In this study, transcritical refrigeration cycle using carbon dioxide is of great interest, and the evaporation process is investigated by experiment and analysis. This paper presents the measured heat transfer coefficients and pressure drop during evaporation process of carbon dioxide in a horizontal smooth tube. The test section was made of a seamless stainless steel tube with the inner diameter of 7.53 mm, and length of 5 m. Heat is provided by a direct heating method to the test section. Experiments were conducted at saturation temperatures of -4 to 20 °C, heat fluxes of 12 to 20 kWm-2 and mass fluxes of 200 to 530 kgm-2 s -1. A comparison of different heat transfer correlations applicable to evaporation of carbon dioxide has been made. Based on the experiments for the evaporation heat transfer, useful correlation is developed.
| Original language | English |
|---|---|
| Pages (from-to) | 111-119 |
| Number of pages | 9 |
| Journal | International Journal of Refrigeration |
| Volume | 27 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 2004 Mar |
Bibliographical note
Funding Information:This work was supported by Korea Science and Engineering Foundation (Grant No. 1999-1-304-006-3) and Micro Thermal System Research Center of Seoul National University. The support from BK21 project is also greatly appreciated.
Copyright:
Copyright 2019 Elsevier B.V., All rights reserved.
Keywords
- Carbon dioxide
- Drop
- Evaporation
- Heat transfer
- Mass transfer
- Pressure
- Smooth tube
ASJC Scopus subject areas
- Building and Construction
- Mechanical Engineering