相关性对抛物线槽集热器热性能建模的影响

IF 2.1 4区 工程技术 Q3 ENERGY & FUELS Journal of Solar Energy Engineering-transactions of The Asme Pub Date : 2023-05-04 DOI:10.1115/1.4062170
Julian Osorio, Tugba Sensoy, Alejandro Rivera, Gustavo A Patino-jaramillo, Juan C Ordonez
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引用次数: 1

摘要

摘要分析了相关系数对抛物线槽集热器热性能建模的影响。开发了一种用于抛物线槽集热器的通用模型,该模型允许一维和二维分析,并允许使用相关性来计算热物理性质和对流传热系数。该模型还允许在特定温度下使用从评估相关性中获得的属性和/或系数的恒定值。每个相关性的影响被独立评估,结果与考虑二维方法并使用所有相关性的参考案例进行比较。在分析的情况下,吸收体发射度的相关性对集热器效率的影响最大,导致使用时误差较小。基于结果,考虑吸收体发射度相关性的一维模型方法导致集热器长度达243.6 m时效率误差低于3%。与参考情况相比,对于长度为500 m、入口温度为773 K的集热器,使用所有相关性的一维方法可导致约9%的误差。然而,使用恒定的属性值和传热系数可能导致高达50%的误差。文献中提出的抛物线槽集热器的多种热模型依赖于一维方法、传热系数估计值和恒定的热物理性质。与这些方法相关的误差在本工作中作为集热器长度和操作温度的函数进行了分析和量化。
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Influence of Correlations on the Thermal Performance Modeling of Parabolic Trough Collectors
Abstract The influence of correlations on the thermal performance modeling of parabolic trough collectors was analyzed in this work. A versatile model for a parabolic trough collector was developed that allows one- and two-dimensional analysis and enables the use of correlations to calculate thermophysical properties and convection heat transfer coefficients. The model also allows the use of constant values for properties and/or coefficients obtained from the evaluation correlations at a specific temperature. The effect of each correlation was evaluated independently, and the results were compared with a reference case that considered a two-dimensional approach and used all the correlations. For the analyzed cases, the correlation for the absorber emittance has the strongest impact on the collector efficiency, leading to a lower error when used. Based on the results, a one-dimensional model approach considering a correlation for the absorber emittance leads to efficiency errors below 3% for collector lengths of up to 243.6 m. Compared with the reference case, a one-dimensional approach using all correlations for a collector with a length of 500 m, and operating with an inlet temperature of 773 K, can result in errors around 9%. However, using constant values for properties and heat transfer coefficients could lead to errors of up to 50%. Multiple thermal models for parabolic trough collectors proposed in the literature rely on a one-dimensional approach, estimated values for the heat transfer coefficients, and constant thermophysical properties. The errors associated with those approaches are analyzed and quantified in this work as a function of the collector length and operation temperature.
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来源期刊
CiteScore
5.00
自引率
26.10%
发文量
98
审稿时长
6.0 months
期刊介绍: The Journal of Solar Energy Engineering - Including Wind Energy and Building Energy Conservation - publishes research papers that contain original work of permanent interest in all areas of solar energy and energy conservation, as well as discussions of policy and regulatory issues that affect renewable energy technologies and their implementation. Papers that do not include original work, but nonetheless present quality analysis or incremental improvements to past work may be published as Technical Briefs. Review papers are accepted but should be discussed with the Editor prior to submission. The Journal also publishes a section called Solar Scenery that features photographs or graphical displays of significant new installations or research facilities.
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