Optimization Of Organic Rankine Cycle (orc) And Supercritical Cycle Powered By Low Temperature Gethermal Source

The research on low-temperature geothermal power generation technology, will promote exploitation and usage of the huge quantity energy of low temperature geothermal resources, reduce fossil fuel consumption and greenhouse gas emissions and other air pollutants, In addition it will bring huge social and economic benefits. Limited by the level of geothermal source temperature, the efficiency of power system is very low. Select better cycle, working fluid and operating conditions will be helpful in improve the economy of system.This thesis based on low temperature geothermal resources, calculate the performance of 19 kinds of organic refrigerants when they were used in trans-critical cycle or sub-critical ORC power generation system under the multi-objective function, by comparison and analysis we selected some working fluids with better performance. Combined the design of heat exchanger, optimal calculation was done to find out the most economical working fluid system under the objective function of APR and system net output power. Change the evaporating temperature, condensing temperature, pressure, turbine inlet temperature and other parameters respectively to see the influence on system economy. The results showed that R152a and R41 has good performance, trans-critical cycle using R41 has maximum output power and sub-critical cycle using R152a has little APR while lager output power.We designed low-temperature power generation systems with R152a and R41 as working fluids respectively, then makes a study on investment appraisal of the systems equipment, the results shows that the system with R152 has higher rate of return on investment than another. While the trans-critical system with R41 has higher net income than sub-critical system.