Study on a Combined Cooling Heating and Power Supply System Based on Compressed Air Energy Storage

The waste heat of gas turbine combined cooling heating and power (CCHP) supply systems can be used efficiently and the energy utilization efficiency is high. However, the energy of the system has not been fully utilized in many time periods throughout the year. This paper proposes a CCHP system consisting of a compressed air energy storage (CAES) system and a small gas turbine system. The proposed system improves the low efficiency of gas turbine under off-design conditions, high efficiency is achieved through energy storage and overall economy is improved. This paper uses GateCycle software to establish a system model for research and analysis. In the practical application, the energy to price ratio is the highest when the flue gas shunt ratio is 0.21 at the heat exchanger in summer, The energy to price ratio is the highest when the flue gas shunt ratio is 0.35 at the heat exchanger in winter, the energy to price ratio increases with the increase of flue gas shunt ratio at the heat exchanger in spring and autumn. In the typical days of different seasons, the third way of energy supply has the lowest cost, the first way of energy supply has the lowest cost. So, it can prove the superiority of this system in distributed energy supply.