A simplified model for internal heat exchanger in transcritical carbon dioxide refrigeration cycle.

Date of Award


Publication Type

Master Thesis

Degree Name



Mechanical, Automotive, and Materials Engineering


Engineering, Mechanical.




Due to the inherent limitation of transcritical carbon dioxide (CO2) refrigeration system, the internal heat exchanger (IHX), which can improve CO2 system performance, is not optional but necessary. This research focused on heat transfer characteristics of an IHX in the transcritical CO2 refrigeration cycle. The CO2 IHX, employing non-constant property fluid, displays differently compared with the traditional heat exchangers due to its drastic variations of the CO 2 thermophysical properties in the supercritical region. A simulation model of the supercritical CO2 in tube flow was developed to do the comprehensive parametric study of the thermal performance of CO2 in the supercritical region. Based on this model a simulation model of IHX in the transcritical CO2 refrigeration cycle was developed and the results were compared with the published experimental data. The study of heat transfer characteristics in the IHX was carried out and the main factors that affect IHX performance were determined. The simulation results demonstrated that in the IHX the hot CO2 inlet parameters have significant influences on the hot CO2 heat transfer coefficient. On the other hand, the cold CO2 inlet parameters have minor effects on CO2 heat transfer coefficient on both sides. This research is of significance to the design of the IHX in the transcritical CO2 refrigeration cycle.Dept. of Mechanical, Automotive, and Materials Engineering. Paper copy at Leddy Library: Theses & Major Papers - Basement, West Bldg. / Call Number: Thesis2006 .L8. Source: Masters Abstracts International, Volume: 45-01, page: 0452. Thesis (M.A.Sc.)--University of Windsor (Canada), 2006.

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