As a type of renewable energy

solar energy has attracted more and more attention in recent years. The solar energy can be collected by the solar collectors with the temperature lower than 100°C efficiently. The Organic Rankine Cycle that transforms the low temperature heat source with the temperature lower than 100°C into electricity has been recognized and developed by the academics. Considering that the expander is a key component of an ORC

firstly

this paper selected R600 as working fluid for ORC system

then the thermodynamic performance is analyzed

and simultaneously the performance of scroll expander is simulated by the experiments with the compressed air. Through the theoretical analysis of ORC

when the heat source temperature and ambient temperature are 78-97°C and 30°C

respectively

0.7-1kW electricity can be obtained. Correspondingly

exergy efficiency is from 0.84 to 0.89. Compressed air is used to simulate R600. Inlet temperature of the expander changes from 75°C to 95°C while corresponding pressure changes from 0.8MPa to 1.2MPa

and outlet pressure is controlled at 0.28MPa. Isentropic efficiency is maintained at about 0.7. The work-power efficiency decreases when the ideal output power increases.