TY - JOUR
T1 - Thermo-economic comparison of Kalina and CO2 transcritical power cycle for low temperature geothermal sources in China
AU - Li, Saili
AU - Dai, Yiping
PY - 2014/9/5
Y1 - 2014/9/5
N2 - Over 3200 geothermal spots have been discovered in China. With purpose of evaluating the performance of enhanced geothermal systems, a thermal-economic comparative analysis is conducted between CO2 transcritical power cycle (CTPC) and Kalina cycle driven by the low temperature geothermal water. The two cycles are compared through six indicators: net power output, thermal efficiency, exergy efficiency, total heat exchanger area, cost per net power (CPP) and the percentages that heat exchangers occupied in the total cost (PHC). Moreover, the single indicator is optimized by means of genetic algorithm (GA) and the optimum value of each indictor is compared between the CTPC and Kalina cycle. Geothermal water with the same temperature and mass flow rate is chosen as the heat source for both the systems. The results show that the Kalina cycle presents a higher net power output and thermal efficiency while the exergy efficiency of the Kalina cycle is less than that of the CTPC. In addition, the Kalina cycle presents a lower CPP and PHC which represent a better economic performance than the CTPC. Therefore, the adoption of the Kalina cycle may be reasonable in the low-temperature geothermal sources due to the better thermo-economic performance in contrast to the CTPC.
AB - Over 3200 geothermal spots have been discovered in China. With purpose of evaluating the performance of enhanced geothermal systems, a thermal-economic comparative analysis is conducted between CO2 transcritical power cycle (CTPC) and Kalina cycle driven by the low temperature geothermal water. The two cycles are compared through six indicators: net power output, thermal efficiency, exergy efficiency, total heat exchanger area, cost per net power (CPP) and the percentages that heat exchangers occupied in the total cost (PHC). Moreover, the single indicator is optimized by means of genetic algorithm (GA) and the optimum value of each indictor is compared between the CTPC and Kalina cycle. Geothermal water with the same temperature and mass flow rate is chosen as the heat source for both the systems. The results show that the Kalina cycle presents a higher net power output and thermal efficiency while the exergy efficiency of the Kalina cycle is less than that of the CTPC. In addition, the Kalina cycle presents a lower CPP and PHC which represent a better economic performance than the CTPC. Therefore, the adoption of the Kalina cycle may be reasonable in the low-temperature geothermal sources due to the better thermo-economic performance in contrast to the CTPC.
KW - Kalina cycle
KW - Low temperature geothermal source
KW - Single object optimization
KW - Thermo-economic comparison
UR - https://www.scopus.com/pages/publications/84901398901
U2 - 10.1016/j.applthermaleng.2014.04.067
DO - 10.1016/j.applthermaleng.2014.04.067
M3 - 文章
AN - SCOPUS:84901398901
SN - 1359-4311
VL - 70
SP - 139
EP - 152
JO - Applied Thermal Engineering
JF - Applied Thermal Engineering
IS - 1
ER -