基于新型电阻网络模型的太阳能集热器热性能评价

A. Nokhosteen, Sarvenaz Sobhansarbandi
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引用次数: 0

摘要

热管真空管太阳能集热器(HPETCs)是一种具有吸引人的特点的太阳能集热器,适用于太阳能热水(SWH)技术。为了更好地理解高温petcs中的传热现象并提高其效率,需要一种快速、鲁棒的数值计算工具。由于集热器性能建模所涉及的传热过程的复杂性,直接数值分析解决方案(DNS)在计算上很麻烦。近年来的研究表明,电阻网络(RN)模型是研究HPETCs性能和热行为的合适工具。本文提出了一种基于适当正交分解(RNPOD)电阻网络的新方法,该方法不仅考虑了周围环境的地理和气象特征,而且考虑了单个HPETC的周边温度分布。一旦计算出每个实例的温度,就可以使用POD方法以所需的时间精度预测集热器的热行为。本文的研究结果与作者之前的实验工作进行了交叉验证,表明该模型能够预测外围温度分布,最大误差为10%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Thermal Performance Evaluation of a Solar Collector Utilizing a Novel Resistance Network Model
Heat pipe evacuated tube solar collectors (HPETCs) are a type of solar collectors with appealing characteristics for the application in solar water heating (SWH) technologies. In order to better understand the heat transfer phenomena in HPETCs and improve their efficiency, there is a need for a fast and robust numerical tool. Due to the complexity of the heat transfer processes involved in modeling a collector’s performance, direct numerical analysis solutions (DNS) are computationally cumbersome. Recent studies have shown that resistance network (RN) models are suitable tools for studying the performance and thermal behavior of HPETCs. In this work, a novel method of resistance network based proper orthogonal decomposition (RNPOD) is presented which can not only consider the geographical and meteorological characteristics of the ambient surroundings, but also take into account the peripheral temperature distribution of a single HPETC. Once the temperatures at each instance in time have been calculated, a POD method is used to predict the thermal behavior of the collector with desired temporal accuracy. The obtained results of this study are cross-validated with the previous experimental work of the authors, illustrating that the model is able to predict the peripheral temperature distribution with a maximum error of 10%.
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