A novel solar thermal power generation system was presented

which was the new central receiver system with beam-down reflectors. The structure and process of the new system were designed. The new claw engine included two-stage claw compressor and two-stage claw expander

which were coaxial series connection. So the claw engine had many advantages

such as dry oil free

compact structure

automatic balance axial force

and so on. The electricity generation cycle system realized employing displacement compressor and displacement expander

isobaric heat absorbent process

to complete power generation process

so that it had the high electricity generation efficiency. The change regulation of circle efficiency with and without extra heat-exchange

influenced by different compression ratios and heat collecting temperature were obtained.