Experimental Investigation on Flow Boiling Heat Transfer of CO2 at Low Temperatures

2009 ◽  
Vol 30 (1-2) ◽  
pp. 2-11 ◽  
Author(s):  
Xiumin Zhao ◽  
Pradeep Bansal
Keyword(s):  
Heat Transfer ◽  
Experimental Investigation ◽  
Low Temperatures ◽  
Boiling Heat Transfer ◽  
Flow Boiling ◽  
Flow Boiling Heat Transfer

Flow Boiling Heat Transfer of CO2 at Low Temperatures: Challenges and Opportunities

2007 ◽  
Author(s):  
Pradeep Bansal ◽  
Xiumin Zhao
Keyword(s):  
Heat Transfer ◽  
Low Temperatures ◽  
Boiling Heat Transfer ◽  
Flow Boiling ◽  
Stainless Steel Tube ◽  
Limited Information ◽  
Heat Transfer Characteristics ◽  
Transfer Coefficients ◽  
Transfer Characteristics ◽  
Flow Boiling Heat Transfer

There is a growing use of CO2 refrigeration to achieve low temperatures, particularly in the food industry, however, very limited information is available in the open literature on its boiling heat transfer characteristics below (−)30°C. This paper presents an overview of the flow boiling heat transfer characteristics of pure CO2 at low temperatures, its special thermal properties and their effect on the boiling heat transfer. The paper also presents an analysis of the experimental data collected from (−)24.3°C to (−)40°C in a novel experimental rig, specifically designed to achieve low temperatures down to (−)50°C, using 4.5m long horizontal stainless steel tube of 4.57mm inner diameter. The paper highlights the limitations of existing empirical correlations by comparing their predictions with the experimental boiling heat transfer coefficients. It is expected that the data presented in this study would be beneficial to industry and designers of compact heat exchangers for CO2 at low temperatures.

Sign in / Sign up

Export Citation Format

Share Document