Theoretical Analysis of a Solar-geothermal Hybrid Thermodynamic Cycle Using Transcritical Carbon Dioxide for Combined Heat and Power
Theoretical analysis of a solar–geothermal hybrid thermodynamic cycle using transcritical carbon dioxide as working fluid,is presented.Performance of the system was investigated and the effects of various design conditions were studied by Engineering Equation Solver(EES).The results show that the daily average electricity power efficiency is about 7.51%at the proposed system working conditions.Besides the power,the system can also produce much more heat,which can be used for further use,such as heat source of reboiler columns of carbon dioxide capture process using chemical absorption and space heating or domestic hot water preparation and so on.The daily average heat generation efficiency can reach up to 58.45%.It was also found that solar radiation has strongly influence on the cycle performance.Also the electricity power efficiency and heat generation efficiency decrease with increasing of the number of metal tubes of evacuated solar collector,but increase firstly and then decrease with the geothermal water temperature.Additionally,heat generation efficiency increases with increasing carbon dioxide flow rate,but electricity power efficiency increases first and then decreases with increasing carbon dioxide flow rate.The study shows that the proposed system is a promising alternative for renewable energy utilization system utilising low and medium grade geothermal and solar energy.
Solar-geothermal Carbon dioxide Transcritical cycle Combined heat and power production Efficiency
Yan Liu Jun Zhao Qingsong An Hang Qu
Key Laboratory of Efficient Utilization of Low and Medium Grade Energy,MOE,Tianjin 300072,China Department of Thermal Engineering,Yantai 264025,China
国际会议
桂林
英文
1-14
2013-07-16（万方平台首次上网日期，不代表论文的发表时间）