To ensure the continuously stable operation of adiabatic isothermal-compressed air energy storage system

an adiabatic-isothermal compressed air energy storage method coupled with buffer tank is proposed. The dynamic thermodynamic model of the buffer tank coupled system is established

and the experimental platform is set up to verify the model. Besides

the variation mechanism of air temperature and pressure in the buffer tank is revealed

and the influence of design parameters of buffer tank on system performance is explored. The results show that

the adiabatic-isothermal compressed air energy storage system with buffer tank exhibits favorable isotherm

and the highest temperature difference at 30 K during the cycle. The adiabatic efficiency of the compressor unit of the coupled buffer tank system increased by 8 percentage points

and the exergy loss of the compressor unit decreased. Sensitivity analysis shows that the change of energy storage power has little effect on thermodynamic parameters of the air storage room

and the volume of the buffer tank decreases with the increase of energy storage power. Moreover

the change of energy storage scale has little influence on thermodynamic parameters of the air storage room

and the change trend of air temperature shows a periodic fluctuation. When the system energy storage scale increases

the volume of buffer tank will increase with the energy storage scale. The study provides a novel scheme for the continuous

stable and efficient operation of adiabatic-isothermal compressed air energy storage system.