耦合余热回收的高温热泵储能供热系统研究OA

To enhance the renewable energy utilization and improve the recovery and reuse of industrial waste heat,this study proposes a high-temperature steam supply system utilizing pumped thermal energy storage(PTES)with wastewater heat recovery.The system adopts a high-temperature heat pump to extract low grade heat from wastewater during off-peak periods.It integrates a solid thermal storage unit to accumulate and release heat to achieve continuous high-temperature steam supply.A thermodynamic model of the PTES system was developed in Aspen Plus and MATLAB.The model comprises a compressor,an expander,heat exchangers,a steam generator,and a solid storage module for simulating the energy transfer.Using the model,the system performance under various operating conditions was assessed.The simulation results show that when the wastewater temperature is 60℃,the coefficients of performance(COP)for air,argon,nitrogen,and carbon dioxide are 1.519,1.478,1.523 and 1.327,respectively.For the solid thermal storage unit,a porosity of 0.35 and particle diameters between 0.03 and 0.05 m yield the optimal thermal efficiency and COP.A sensitivity analysis using air as the working fluid evaluated the influence of key parameters.The results show that higher wastewater temperatures and lower compressor outlet temperatures enhance system performance.When the waste heat temperature reaches 100℃and the compressor outlet temperature 400℃,the system COP increases to 1.658.An equipment cost estimation shows that the compressor and the electric motor contribute the largest shares in the total cost,suggesting that compression and power conversion units should be the main targets of economic optimization.The results provide technical support and useful references for the feasibility assessment and engineering design of high-temperature PTES systems for industrial heating.