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<p>The integration of a solar thermal storage system (STSS) with an absorption heat transformer (AHT) offers a robust solution to two critical challenges in sustainable energy systems: mitigating solar intermittency and industrial waste heat recovery. This study theoretically assessed the energy performance of a STSS-powered AHT across three dry climates: subtropical, semi-arid and temperate. Simulations using TRNSYS and new models considered a mean global irradiance of 5.4–5.8&#xa0;kWh/m<sup>2</sup>-day. The STSS was designed to continuously supply 24&#xa0;h/7d hot water at 358.2&#xa0;K to the AHT, which in turn raised the temperature to 368.1&#xa0;K. Results showed a strong correlation between theoretical and experimental data (<i>R</i><sup><i>2</i></sup> &gt; 0.95). The solar system, with an 86.4&#xa0;m<sup>2</sup> collector area, an 80.9% solar fraction, and 391.5&#xa0;kWh/m<sup>2</sup>-year solar heat gain, performed consistently, fulfilling 80.9–84.3% of the AHT’s annual energy needs across all dry climates, supplemented by auxiliary heating. The subtropical climate yielded the highest solar energy contribution (84.3%), followed by semi-arid (82.6%) and temperate (80.9%). The coefficient of performance ranged from 0.32 to 0.46. Sunshine duration significantly influenced the solar energy contribution across all climates, while the impact of precipitation and ambient temperature varied. These findings underscore the necessity of tailoring solar-powered AHT systems to local climatic conditions to optimize energy efficiency and scalability in dry climates. This approach avoids up to 9.2&#xa0;tons of CO<sub>2</sub> per city annually, highlighting its role in decarbonizing thermal processes. </p>

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Solar-powered absorption heat transformer: energy performance assessment in dry climates

  • 期刊论文

  • 发表日期：

    2025年6月2日

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  • Luis Adrián López-Pérez,
  • Armando Huicochea

摘要

The integration of a solar thermal storage system (STSS) with an absorption heat transformer (AHT) offers a robust solution to two critical challenges in sustainable energy systems: mitigating solar intermittency and industrial waste heat recovery. This study theoretically assessed the energy performance of a STSS-powered AHT across three dry climates: subtropical, semi-arid and temperate. Simulations using TRNSYS and new models considered a mean global irradiance of 5.4–5.8 kWh/m2-day. The STSS was designed to continuously supply 24 h/7d hot water at 358.2 K to the AHT, which in turn raised the temperature to 368.1 K. Results showed a strong correlation between theoretical and experimental data (R2 > 0.95). The solar system, with an 86.4 m2 collector area, an 80.9% solar fraction, and 391.5 kWh/m2-year solar heat gain, performed consistently, fulfilling 80.9–84.3% of the AHT’s annual energy needs across all dry climates, supplemented by auxiliary heating. The subtropical climate yielded the highest solar energy contribution (84.3%), followed by semi-arid (82.6%) and temperate (80.9%). The coefficient of performance ranged from 0.32 to 0.46. Sunshine duration significantly influenced the solar energy contribution across all climates, while the impact of precipitation and ambient temperature varied. These findings underscore the necessity of tailoring solar-powered AHT systems to local climatic conditions to optimize energy efficiency and scalability in dry climates. This approach avoids up to 9.2 tons of CO2 per city annually, highlighting its role in decarbonizing thermal processes.