[论文解读] Understanding Heat Transport Mechanisms in Optically Transparent Thermal Loss Mitigators

Domala Sai Suhas, Vikrant Khullar|arXiv (Cornell University)|Jan 26, 2026

Building Energy and Comfort Optimization被引用 0

一句话总结

本文开发实验建模框架以识别并量化光学透明热损失缓解器中的传热机制，并在各种条件下比较多种缓解器。

ABSTRACT

Optically transparent thermal loss mitigators have recently seen renewed research interests owing to their increasing relevance in the realms ranging from smart windows, efficient greenhouse designs and high-performance-low-cost solar thermal systems. In depth understanding of the heat transport mechanisms and their quantification is crucial for building efficient opto-thermal management strategies for optimization of the aforementioned systems. The present work serves to identify and quantify the key heat transfer mechanisms operative in a host of optically transparent thermal loss mitigators. In particular, comprehensive experimental modelling frameworks have been developed to investigate the efficacy of carbon dioxide gas (CO2), air, vacuum (0.07mbar), transparent heat mirrors (Indium tin oxide coated glass) and aerogels (silica-based) in mitigating thermal losses. Detailed and careful experimental modelling reveals that it is imperative to employ more than one thermal loss mitigator and choose correct absorber surface orientation (relative to the irradiation direction) to maximize thermal loss mitigation. Magnitude of absorber surface stagnation temperature has been employed as the figure of merit to quantitatively compare various optically transparent thermal loss mitigators. Under un-evacuated conditions, CO2 has emerged as potent alternative to more sophisticated optically transparent thermal loss mitigators like aerogels and transparent heat mirrors. Enhancements (relative to air) on the order of 2%-7%, 46%-84%, 57%-84% and 66%-86% are observed in case of CO2, vacuum, transparent heat mirrors (vacuum) and aerogel (vacuum) respectively.

研究动机与目标

• 识别并量化光学透明热损失缓解器中的关键传热机制。
• 开发实验建模框架以评估不同缓解器的有效性。
• 确定吸收体表面相对于照射方向的取向如何影响热损失缓解。
• 提供定量比较以指导在光热系统中选择和整合缓解器。

提出的方法

• 建立全面的实验建模框架来研究 CO2、空气、真空、ITO涂层玻璃（透明热镜）以及基于二氧化硅的气凝胶作为热损失缓解器。
• 以吸收体表面停滞温度作为定量比较的性能指标。
• 评估未抽空条件对各缓解器性能的影响。
• 分析吸收体表面相对于照射方向的取向对缓解效果的影响。

实验结果

研究问题

• RQ1 不同的光学透明热损失缓解器中主导的传热机制是什么？
• RQ2 CO2、空气、真空、透明热镜及气凝胶在降低吸收体停滞温度方面的比较如何？
• RQ3 吸收体表面取向在最大化热损失缓解中的作用是什么？
• RQ4 在未抽空条件下，缓解器的组合能否超过任一单一材料的性能？
• RQ5 在不同条件下，不同缓解器与空气相比可带来多大幅度的改进？

主要发现

• 在未抽空条件下，CO2 可以成为相较于更复杂缓解器的强有力替代方案。
• 相对于空气的提升在 CO2 为 2%-7%，真空为 46%-84%，真空条件下的透明热镜为 57%-84%，真空条件下的气凝胶为 66%-86%。
• 使用多种缓解器的组合并优化吸收体取向显著优于单一材料方法的缓解性能。
• 实验导出的模型强调选择合适的吸收体和取向以最大化热损失缓解的重要性。