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were measured. Different existing correlations were used to calculate the overall heat transfer coefficient and the results were compared with the measured value. The measured results show that the new designed heat exchanger can achieve a good heat transfer performance and also maintain a low pressure drop on the shell‐side (gas side). Y. Chen, P. Lundqvist, “The CO2 Transcritical Power Cycle for Low‐Grade Heat Recovery—Discussion on Temperature Profiles in System Heat Exchangers”, ASME Power and ICOPE Conference, Denver, USA, July 12‐14, 2011 This study discusses the advantage of a carbon dioxide power system in low‐grade heat source recovery with a focus on the temperature profiles in the system heat exchangers. The sharp Cp variation of supercritical CO2 in the region close to its critical point is examined. The influence of this variation on the performance of the heat exchangers that are used in low‐ grade heat source utilization is studied and discussed. Moreover, the effect of inserting an internal heat exchange on the cycle performance is also investigated The simulation results show that due to the dramatic change the Cp of supercritical CO2 in the region close to its critical point, the temperature profiles in the system gas heater will show a concaved shape. This enables the system’s gas heater to achieve a small temperature difference on both ends and at the same time maintain a small heat exchanger size. Furthermore, the Cp variation also enables supercritical CO2 to recover the energy both in expansion outlet carbon dioxide and in low‐ grade heat sources sufficiently. For the influence of internal heat exchanger, up to about 50% of cycle thermal efficiency improvement was found. 127PDF Image | Thermodynamic Cycles using Carbon Dioxide
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