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the energy in automobile exhaust gases to produce electricity for the A/C compressor, and thus both increases the cooling COP and decreases the vehicle’s fuel consumption by reducing the compressor’s energy demand. Moreover, different factors that influence the cycle’s optimum working conditions are also discussed. The software Engineering Equations Solver (EES) is used to model and to analyze the system performance. Results show that the proposed combined system can achieve a COP of 3.18 for the cooling part and 12.6% efficiency for the power part under typical working conditions. After transferring the energy gained from the cycle to its compressor, the new COP will be 4.45 and the improvement of the COP will be around 40% accordingly. Y. Chen, P. Lundqvist, “Analysis of Supercritical Carbon Dioxide Heat Exchangers in Cooling Process”, International Refrigeration and Air Conditioning Conference, Purdue, USA, July 17‐20, 2006 In this paper, the Cp variation of supercritical CO2 and its influence on the temperature profile in heat exchangers used for supercritical carbon dioxide refrigeration process including a suction gas heat exchanger are simulated and analyzed. A basic carbon dioxide transcritical refrigeration cycle has been adopted for the study. The results calculated in EES and Refprop 7 show that due to the sharp variation in the specific heat of supercritical carbon dioxide, the temperature profile in the gas cooler will show a concave shape. Due to the shape of the temperature profile, the temperature difference, which is the “driving force” for heat transfer to take place, will be much smaller inside the gas cooler than at its ends. Therefore, • To remove a certain amount of heat from the gas cooler, the required heat exchanger surface will be much bigger than in one without such a shape of temperature profile. 124PDF Image | Thermodynamic Cycles using Carbon Dioxide
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