Multigeneration-CAES system with biomass energy integration: Energy implications and exergoeconomic

Using biomass energy, this research evaluated the energy, exergy and exergoeconomic characteristics of the combination of the multigeneration system (MGS) and the compressed air energy storage system (CAES). It features a combined Brayton and compressed air energy storage sub-cycle (CBACS) and a combined proton exchange membrane (PEM) electrolysis and heating sub-cycle (CPEAHS). Hot water is generated economically during off-peak hours, while electricity, hot water, hydrogen, and oxygen are generated during peak hours. Through evaluating the system's charge/discharge, it was found that the MGS-CAES can produce 681 kW of electricity, 5.8 kg/s of hot water, 5.4 kg/h of hydrogen, and 6.7 kg/h of oxygen, making its implementation feasible. As part of our parametric study, we explored how decision variables, including the entry temperature of the gas turbine, the entry pressure of the compressed air storage cavern (CASC), the CASC outlet pressure and biomass mass flow rate affect thermal and economic performance. Upon lowering the entry temperature of the gas turbine, the round-trip productivity increased by 1.1 %, and the overall capital investment and overall cost of the product were both reduced to 85.8 $/h and 111 $/h. The exergy destruction cost rate reaches its minimum value of $ 64.24 per hour at an inlet pressure of 2200 kPa for the CASC system., while rising the CASC outlet pressure improved the MGS-CAES exergy round trip efficiency by 3.4 %. It is estimated that biomass mass flow rate growth resulted in an enhancement of heat and electricity production.