To meet the demand for a high-efficiency, anti-freezing, and building-integrated solar water heating system, a versatile loop heat pipe-based solar thermal façade water heating system has been developed in recent years. To date, a comprehensive summary of evaluation indexes has not yet been reported for assessing the transient and steady-state performance of the loop heat pipe, which deserves to be determined because the overall thermal efficiency of the system is highly sensitive to the operational performance of the loop heat pipe. In addition, the heat transfer process within the system is analyzed along the three stages of the heat transfer path, namely, solar absorption, outdoor to indoor heat transportation, and water heating, to reveal the working mechanism of the system and clarify the factors influencing its behavior. In line with these three stages and practical requirements, the refined improvement strategies for system performance are elaborately summarized from three corresponding aspects, including the solar absorber structure, heat transfer fluid, and energy storage, to provide a reference for achieving a superior heat transfer effect. The particularity of the system lies in the involved heat and mass transfer phenomena and the latent heat thermal energy storage technology, which are the core issues worthy of in-depth exploration. Therefore, the system’s potential for further development is outlined to promote market penetration. Through the current comprehensive analysis, the evaluation criteria of the operational characteristics of loop heat pipe and loop heat pipe-based solar thermal façade water heating systems as well as performance enhancement techniques are methodically expounded. This review is expected to lay a solid foundation for improving and extending the loop heat pipe-based solar thermal façade water heating system, along with achieving the targets for significant energy-saving and environmental benefits.

为满足对高效、防冻、建筑一体化太阳能热水系统的需求，近年来开发了一种基于多功能回路热管的太阳能热立面热水系统。迄今为止，还没有关于评价回路热管瞬态和稳态性能的综合评价指标的报道，值得确定，因为系统的整体热效率对运行性能高度敏感。环路热管。此外，还沿着传热路径的三个阶段，即太阳能吸收、室外向室内传热和水加热，分析了系统内的传热过程，揭示了系统的工作机理，阐明了影响因素。它的行为。结合这三个阶段和实际需求，从太阳能吸收器结构、传热流体、储能三个对应方面精心总结了系统性能的精细化改进策略，为实现优越的传热效果提供参考。 . 该系统的特殊性在于所涉及的传热传质现象和潜热蓄热技术，是值得深入探讨的核心问题。因此，概述了该系统进一步发展的潜力，以促进市场渗透。通过目前的综合分析，系统地阐述了环路热管和基于环路热管的太阳能热立面热水系统运行特性的评价标准以及性能提升技术。本次审查有望为改进和扩展基于回路热管的太阳能热立面热水系统奠定坚实的基础，同时实现显着的节能和环境效益目标。