A dynamic thermal performance model for flat-plate solar collectors based on the thermal inertia correction of the steady-state test method
A dynamic thermal performance model for flat-plate solar collectors based on the thermal inertia correction of the steady-state test method
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DOI：
10.1016/j.renene.2014.12.005
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发表时间：
2015-04
期刊：
影响因子：
8.7
通讯作者：
Jie Deng;Yupeng Xu;Xudong Yang
中科院分区：
文献类型：
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作者：
Jie Deng;Yupeng Xu;Xudong Yang
在确定平板太阳能集热器的动态热性能时，当太阳辐照度在某一时刻急剧变化时，现有的模型大多不能准确地预测出口温度和有用热增益的瞬时热特性。本文提出了一种级数展开形式的解析模型来描述平板集热器的瞬时热特性。分析模型表明，太阳能集热器在某一时刻的瞬时可用热增量由稳态可用热增量和相应的热惯量修正组成。通过实验数据对模型进行了验证。结果表明，该分析模型能较好地预测太阳能空气集热器的动态热性能。此外，该模型适用于其他类型的太阳能集热器，如果它们可以用稳态测试方法进行测试的话。
In determining the dynamic thermal performance of a flat-plate solar collector, when the instantaneous solar irradiance changes sharply at one moment, most of the existing models cannot accurately predict the momentary thermal characteristics of outlet temperature and useful heat gain. In the present study, an analytical model in the form of series expansion is put forward to depict the momentary thermal characteristics of flat-plate solar collectors. The analytical model reveals that, instantaneous useful heat gain of a solar collector at one moment consists of the steady-state useful heat gain and corresponding thermal inertia correction. The model is then validated by the experimental data. It indicates that the analytical model can properly predict the dynamic thermal performance of the solar air collector. Besides, the model pertains to other types of solar thermal collectors, if they can be tested by the steady-state test method.