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• The logarithmic mean temperature difference, which is calculated by the measured temperature difference at the heat exchanger ends, will over‐predict the real temperature difference for the heat exchanger (gas cooler). • The UA value, which is calculated by the measured logarithmic mean temperature difference, will be under‐ estimated. It is also found that the gas cooler outlet temperature has a crucial influence on the value of optimum gas cooler pressure and consequently the shape of the temperature profile in the gas cooler, i.e. the higher the gas cooler outlet temperature is, the less concave shape the temperature profile inside the gas cooler will be. However, the decrement of system COP with increasing gas cooler should also be considered in system design. Y. Chen, P. Lundqvist, “Low‐Grade Heat Source Utilization by Carbon Dioxide Transcritical Power Cycle”, ASME conference, Vancouver, Canada, July 9‐13, 2007 In this paper, a transcritical carbon dioxide power cycle is analyzed for its potential in utilizing the low‐grade heat sources. Solar thermal is selected as a representative of low‐ grade heat sources. TRNSYS 16 and Engineering Equation Solver (EES) are employed using co‐solving technique to analyze the dynamic performance of the proposed system. Both daily performance and annual performance of the proposed system under Swedish climate conditions are simulated. The simulation results show that the proposed system can achieve 8% average thermal efficiency and consequently 2.43 kW average power production during the system working period on a randomly selected summer day with a 30 m2 solar collector. Over the whole year, the maximum daily power production is about 17 kWh and the maximum monthly power production is about 185 kWh. 125PDF Image | Thermodynamic Cycles using Carbon Dioxide
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