A thermo-hydraulically efficient hybrid solar-geothermal heating solution for sustainable space heating in cold regions

IF 7 2区工程技术 Q1 ENERGY & FUELS

Sustainable Energy Technologies and Assessments Pub Date : 2025-10-10 DOI:10.1016/j.seta.2025.104625

Sunirmit Verma , Adityabir Singh , K. Venkadeshwaran , L. Jino , Hrushikesh Sarangi , Saurabh Aggarwal

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Abstract

This work introduces a hybrid system combining a coaxial borehole-type geothermal heat exchanger (G-HEX) with a rock bed solar-air heater (RBS-AIR), demonstrating the feasibility and enhanced thermo-hydraulic performance of coupling sensible heat storage with geothermal preheating. The study is conducted using average monthly winter climate data from November to March for El Paso, USA, to simulate realistic cold-season performance. A transient numerical model is developed to analyze system performance under varying conditions, complemented by a closed-form steady-state solution for estimating the system’s annual average behavior. Parametric analysis reveals that increasing air mass flow rate boosts net power output by 36.62% in the standalone RBS-AIR and by 45.46% in the hybrid system. The associated temperature penalty is 7.70% without G-HEX and only 1.96% with it, indicating improved thermal stability with integration. The system also benefits from a larger inner and smaller outer radius of the G-HEX, which favorably influence heat transfer. The results show only weak sensitivity to solver parameter variations in the transient model and to soil type in both transient and steady-state simulations. The cost of net power output is calculated as $8.97 per kWh. Overall, the hybrid system offers a reliable and sustainable heating solution by efficiently combining solar and geothermal energy sources for cold climate applications. Future work could explore advanced dynamic control strategies, latent heat storage integration, and multi-source renewable hybridization to further enhance system efficiency and flexibility.

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一种热水力高效的混合太阳能-地热供暖解决方案，适用于寒冷地区的可持续空间供暖

本文介绍了一种将同轴钻孔式地热换热器（G-HEX）与岩床太阳能-空气加热器（rs -air）相结合的混合系统，展示了将显热储存与地热预热耦合的可行性和增强的热工性能。该研究使用美国埃尔帕索从11月到3月的平均月度冬季气候数据进行，以模拟真实的冷季表现。建立了一个瞬态数值模型来分析系统在不同条件下的性能，并辅以一个闭式稳态解来估计系统的年平均性能。参数分析表明，增加空气质量流量可使独立的RBS-AIR系统的净输出功率提高36.62%，混合系统的净输出功率提高45.46%。没有G-HEX的相关温度损失为7.70%，而有G-HEX的相关温度损失仅为1.96%，表明集成后热稳定性得到改善。该系统还受益于G-HEX更大的内半径和更小的外半径，这有利于传热。结果表明，在瞬态和稳态模拟中，对求解器参数变化和土壤类型的敏感性都很弱。净电力输出的成本计算为每千瓦时8.97美元。总的来说，混合系统通过有效地结合太阳能和地热能，为寒冷气候的应用提供了可靠和可持续的供暖解决方案。未来的工作可以探索先进的动态控制策略，潜热存储集成和多源可再生混合，以进一步提高系统的效率和灵活性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Sustainable Energy Technologies and Assessments Energy-Renewable Energy, Sustainability and the Environment

CiteScore

12.70

自引率

12.50%

发文量

1091

期刊介绍： Encouraging a transition to a sustainable energy future is imperative for our world. Technologies that enable this shift in various sectors like transportation, heating, and power systems are of utmost importance. Sustainable Energy Technologies and Assessments welcomes papers focusing on a range of aspects and levels of technological advancements in energy generation and utilization. The aim is to reduce the negative environmental impact associated with energy production and consumption, spanning from laboratory experiments to real-world applications in the commercial sector.