This study presents a theoretical thermoeconomic performance assessment of a novel solar-powered high-temperature heat pump (HTHP)/adsorption cogeneration system for simultaneous electricity production and cooling. Photovoltaic/thermal (PVT) solar collectors are used to capture solar thermal energy and generate electricity that is partially used to drive the HTHP compressor. The HTHP is mainly used to absorb the captured solar thermal energy through its evaporator coils to keep the collectors at lower operating temperatures for better electricity generation. Then through the HTHP compressor, the thermal energy is amplified to produce higher-temperature hot water to drive the adsorption chiller for improved cooling production. The performance of the proposed system (PVT-HTHP) is compared to the performance of the PVT-only, and evacuated tube collectors (ETC-only) powered adsorption chiller for the same solar collector area. A parametric study with different operating HTHP conditions has been performed to determine the optimal operational scenario for the proposed system. A low-GWP refrigerant R1234ze(Z) is considered for the HTHP and compared against the conventional high-GWP R134a option. A complete dynamic mathematical model is developed for the studied systems and solved by MATLAB software. Under the summer conditions of Alexandria, Egypt, the average cooling capacity is improved substantially from 3.91 kW for PVT-only to 8.6 kW for ETC-only and 10.21 kW for proposed PVT-HTHP configuration with R1234ze(Z) and operating evaporator and condenser temperatures of 35 °C and 90 °C, respectively. The best-performing configuration from the energy efficiency perspective is the proposed PVT-HTHP with R1234ze(Z) refrigerant at a value of 46.8% when the operating HTHP evaporator and condenser saturation temperatures of 35 °C and 80 °C, respectively. The economic assessment of the proposed PVT-HTHP system proves that the system can be applied feasibly with a payback period (PBP) of 7.5 years.
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