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Energy and Exergy Performance Analysis of Solar-Assisted Thermo-Mechanical Vapor Compression Cooling System

Author

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  • Hussein A. Al Khiro

    (Faculty of Engineering, University of Nottingham, Nottingham NG7 2RD, UK)

  • Rabah Boukhanouf

    (Faculty of Engineering, University of Nottingham, Nottingham NG7 2RD, UK)

Abstract

Air conditioning is vital for indoor comfort but traditionally relies on vapor compression systems, which raise electricity demand and carbon emissions. This study presents a novel thermo-mechanical vapor compression system that integrates an ejector with a conventional vapor compression cycle, incorporating a thermally driven second-stage compressor powered by solar energy. The goal is to reduce electricity consumption and enhance sustainability by leveraging renewable energy. A MATLAB ® model was developed to analyze the energy and exergy performance using R1234yf refrigerant under steady-state conditions. This study compares four solar collectors—evacuated flat plate (EFPC), evacuated tube (ETC), basic flat plate (FPC), and compound parabolic (CPC) collectors—to identify the optimal configuration based on the collector area and costs. The results show a 31% reduction in mechanical compressor energy use and up to a 44% improvement in the coefficient of performance (COP) compared to conventional systems, with a condenser temperature of 65 °C, a thermal compression ratio of 0.8, and a heat source temperature of 150 °C. The evacuated flat plate collectors performed best, requiring 2 m 2 /kW of cooling capacity with a maximum exergy efficiency of 15% at 170 °C, while compound parabolic collectors offered the lowest initial costs. Overall, the proposed system shows significant potential for reducing energy costs and carbon emissions, particularly in hot climates.

Suggested Citation

  • Hussein A. Al Khiro & Rabah Boukhanouf, 2024. "Energy and Exergy Performance Analysis of Solar-Assisted Thermo-Mechanical Vapor Compression Cooling System," Sustainability, MDPI, vol. 16(19), pages 1-23, October.
    • Handle: RePEc:gam:jsusta:v:16:y:2024:i:19:p:8625-:d:1492497
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    References listed on IDEAS

    as
    1. Li, Huashan & Cao, Fei & Bu, Xianbiao & Wang, Lingbao & Wang, Xianlong, 2014. "Performance characteristics of R1234yf ejector-expansion refrigeration cycle," Applied Energy, Elsevier, vol. 121(C), pages 96-103.
    2. Giovanni Angrisani & Carlo Roselli & Maurizio Sasso & Francesco Tariello, 2014. "Assessment of Energy, Environmental and Economic Performance of a Solar Desiccant Cooling System with Different Collector Types," Energies, MDPI, vol. 7(10), pages 1-24, October.
    3. Palomba, Valeria & Wittstadt, Ursula & Bonanno, Antonino & Tanne, Mirko & Harborth, Niels & Vasta, Salvatore, 2019. "Components and design guidelines for solar cooling systems: The experience of ZEOSOL," Renewable Energy, Elsevier, vol. 141(C), pages 678-692.
    4. Alessio Mastrucci & Bas Ruijven & Edward Byers & Miguel Poblete-Cazenave & Shonali Pachauri, 2021. "Global scenarios of residential heating and cooling energy demand and CO2 emissions," Climatic Change, Springer, vol. 168(3), pages 1-26, October.
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