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首页> 外文会议>Conference of the Italian Thermal Machines Engineering Association >Effects of the Thermal Capacitance on the Daily Thermal Performance of a CPC: an Experimental Investigation
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Effects of the Thermal Capacitance on the Daily Thermal Performance of a CPC: an Experimental Investigation

机译：热电容对CPC日常热性能的影响：实验研究

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The availability of reliable models for the prediction of the daily thermal behaviour of thermal solar collectors is of great relevance for a correct design of solar thermal systems. The most significant design parameters of a solar collector are outlet temperature and useful energy collection, both calculated on the base of the efficiency. The last, in turn, is commonly available on the base of experimental correlations obtained with the Steady State Testing method proposed by EN 12975-2. In these steady state tests, through the respect of very strict requirements, the contributions due to the thermal inertia of the solar collector becomes negligible. However, in its daily behaviour, it undergoes variable weather conditions with both regular and sharp changes of solar radiation. For these conditions the thermal inertia contributions become relevant in the correct prediction of its thermal behaviour. EN 12975-2 in Annex K suggests a modified equation for the prediction of the useful energy collection, based on a modification of the efficiency equation. A term dependent on the time derivative of the mean inlet/outlet water temperature is added. In this paper we examine experimentally the role played by this term for a Compound Parabolic Concentrator solar thermal collector.
机译：用于预测热太阳能集热器的日常热行为的可靠模型与太阳能热系统的正确设计有很大的相关性。太阳能收集器的最重要的设计参数是出口温度和有用的能量收集，都在效率的基础上计算。最后，最后，又在通过EN 12975-2提出的稳态测试方法获得的实验相关基础上。在这些稳态测试中，通过对非常严格的要求，由于太阳能收集器的热惯性导致的贡献变得可忽略不计。然而，在日常行为中，它经历了可变天气条件，太阳辐射的定期变化。对于这些条件，热惯性贡献在其热行为的正确预测中变得相关。 AnEx K中的EN 12975-2提出了一种改进的方程，用于预测有用的能量收集，基于效率方程的修改。加入依赖于平均入口/出口水温度的时间衍生物的术语。在本文中，我们通过实验研究了该术语的作用，用于复合抛物型浓缩器太阳能热集电极。

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