Energy and Economic Evaluation of CPVT Polygeneration System Implementation in a Residential Building
Subject Areas : Smart & Advanced Materialsمهرداد خادمی 1 , علیرضا سرائی 2 , محمدحسن جلال‌الدین ابیانه 3
1 - دانشجوی دکتری، گروه مهندسی مکانیک، واحد تهران جنوب، دانشگاه آزاد اسلامی، تهران، ایران.
2 - استادیار، مهندسی مکانیک، دانشگاه آزاد اسلامی-واحد تهران جنوب، تهران
3 - استادیار، مهندسی مکانیک، دانشگاه آزاد اسلامی-واحد تهران جنوب، تهران
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Abstract :
The objective of this paper is the energy and economic performance assessment of concentrating photovoltaic thermal (CPVT) solar-powered system generating hot water, heating, and cooling for a residential building located in Tehran, Iran. Linear Fresnel reflectors (LFC) and triple-junction solar cells are adopted in the CPVT system. A 5kW single-effect absorption chiller of water ammonium is selected to provide cooling energy utilizing thermal energy. Proposed models for the absorption chiller and the LFC are inaugurated in simulation using EES. Auxiliary heaters are considered in case the solar energy insufficiency. The proposed system employs storage tanks as thermal energy storage (TES) in case of excessive solar energy availability. CPVT with standard solar cells, concentrated thermal collector, PVT with triple-junction solar cells, and PVT with traditional solar cells are investigated for this system. Transient simulations of these systems are conducted in TRNSYSY. The proposed system supplies 48% of the building energy demands surplus to provide 5.58 MWh of electrical power. The proposed structure has the most economic appeal compared to the aforementioned solar systems. It has a 12% internal rate of return (IRR), 159% benefit-to-cost ratio (BCR), and 0.018 $/kWh levelized costs of energy. Combining two CPVT in a parallel configuration reduces the overall energy consumption of the building by 74%, but the 42% higher initial investment reduces the IRR by1%. The low energy costs are the crucial factor that causes the system's payback time to be 7.8 years.