Thermodynamic and economic performance analysis of heat and power cogeneration system based on advanced adiabatic compressed air energy storage coupled with solar auxiliary heat

Abstract

The advanced adiabatic compressed air energy storage system coupled with other systems not only has a high efficiency but also has the ability to produce heat and power simultaneously, which has great application potential. Reasonable allocation of heat generated by the system can improve the performance of the system. Therefore, a model of a cogeneration system based on advanced adiabatic compressed air energy storage coupled with solar auxiliary heat is proposed and five schemes of heat distribution are established. From the perspective of thermodynamics and economics, the performance of five heat distribution schemes (100%, 75%, 50%, 25%, 0%) is analysed and discussed. The effects of effectiveness of three types of heat exchangers, off-peak electricity and product prices on system performance are studied. In addition, the grey wolf algorithm is used for multi-objective optimization. The results show that the smaller the heat distribution ratio is, the greater the exergy efficiency and net present value. The large heat distribution ratio leads to a large energy storage density. The effect of the heat exchanger effectiveness on the system performance is different across different positions of the system. With the increase in on-peak electricity and hot water prices and the decline in low peak electricity price, the net present value increases. Under the optimal conditions, the ranges of the energy storage densities and the net present values of the five heat distribution schemes are 15.109∼17.466 MJ•m−3 and 13.992 × 107∼22.616 × 107$, respectively.