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<p>Classroom temperature influences the students’ learning performance. In Brazil, indoor temperatures in enclosed environments often exceed ideal levels for most of the year. In classrooms and similar spaces with large occupant densities, maintaining an adequate comfortable temperature must be assured for acceptable performance. Conventional solutions, such as window air-conditioning units or chillers, are known for their high electricity consumption and the associated negative impacts on the environment. Consequently, alternative cooling systems powered by renewable energy sources have been investigated. This study pre-dimensioned a single-effect lithium bromide/water (LiBr/H<sub>2</sub>O) absorption cooling system powered by parabolic trough collectors (PTC) for the air conditioning of two classrooms of different sizes. The system operates 10&#xa0;h/day under the climatic conditions of Campinas, Brazil. The thermal loads for classrooms with capacity of 25 and 100 students were assessed using SketchUp, OpenStudio, and EnergyPlus. Cooling calculations were performed using Engineering Equation Solver (EES), while the thermal efficiency of the collectors and the total heat absorbed were determined using the finite volume method (FVM). The integrated system demonstrated an overall efficiency of approximately 50.3% with a COP of 0.721 for the smaller classroom and 46.1% with a COP of 0.661 for the larger classroom. These findings highlight the potential of solar-powered absorption cooling systems to replace conventional, electricity-dependent chillers, thereby reducing energy consumption and minimizing environmental impact.</p>

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Solar-Based Absorption Cooling System with Thermal Storage for Air Conditioning in Classrooms

  • 期刊论文

  • 发表日期：

    2025年11月20日

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  • Raquel M. Carvalho,
  • Kamal A. R. Ismail

摘要

Classroom temperature influences the students’ learning performance. In Brazil, indoor temperatures in enclosed environments often exceed ideal levels for most of the year. In classrooms and similar spaces with large occupant densities, maintaining an adequate comfortable temperature must be assured for acceptable performance. Conventional solutions, such as window air-conditioning units or chillers, are known for their high electricity consumption and the associated negative impacts on the environment. Consequently, alternative cooling systems powered by renewable energy sources have been investigated. This study pre-dimensioned a single-effect lithium bromide/water (LiBr/H2O) absorption cooling system powered by parabolic trough collectors (PTC) for the air conditioning of two classrooms of different sizes. The system operates 10 h/day under the climatic conditions of Campinas, Brazil. The thermal loads for classrooms with capacity of 25 and 100 students were assessed using SketchUp, OpenStudio, and EnergyPlus. Cooling calculations were performed using Engineering Equation Solver (EES), while the thermal efficiency of the collectors and the total heat absorbed were determined using the finite volume method (FVM). The integrated system demonstrated an overall efficiency of approximately 50.3% with a COP of 0.721 for the smaller classroom and 46.1% with a COP of 0.661 for the larger classroom. These findings highlight the potential of solar-powered absorption cooling systems to replace conventional, electricity-dependent chillers, thereby reducing energy consumption and minimizing environmental impact.