Performance Evaluation of a Solar Cooling Plant Applied for Greenhouse Thermal Control

Carlo Alberto Campiotti , Gioacchino Morosinotto , Giovanni Puglisi , Evelia Schettini , Giuliano Vox
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引用次数: 24

Abstract

The greenhouses cultivation causes in summer season inner conditions characterized by high thermal levels such as to generate problems that can damage crops. Always more frequently for this reason it is common to provide greenhouse with air conditioning plants. In this work it will be presented an application of a solar cooling plant with absorption cooling machine for thermal control of a greenhouse and an advanced simulation model able to evaluate optimal plant configurations and controls. Solar cooling systems can be applied for greenhouse climate control in regions with high values of solar irradiation as alternative to traditional evaporative systems, allowing the reduction of primary energy consumption by exploiting the contemporaneity between the cooling requirements and the solar energy availability.

The plant consists of a single effect LiBr-H2O absorption chiller fed by evacuated-tube solar collectors; the model was developed in Matlab-Simulink and is able to simulate dynamically, with time steps up to 15 minutes, the greenhouse cooling demand and the production of the solar field.

Present study proposes a plant configuration with a distribution system in which the cooling power is not provided for the entire volume of the greenhouse, but only for the air volume surrounding the crop with a considerable saving of reduction of energy demand and an extremely efficient use of solar energy. The simulation study is based on the experimental data collected at the experimental center of the University of Bari, Southern Italy.

The aim of the work is to demonstrate that solar cooling system could provide significant energy-saving opportunities for cooling greenhouses allowing the reduction of primary energy consumption by exploiting the contemporaneity between the cooling requirements and the solar energy availability.

应用于温室热控制的太阳能冷却装置的性能评价
在夏季,温室种植会导致以高温为特征的内部条件,例如产生可能损害作物的问题。由于这个原因,通常为温室提供空调植物。在这项工作中,将介绍太阳能冷却装置与吸收式冷却机在温室热控制中的应用,以及能够评估最佳装置配置和控制的先进模拟模型。太阳能冷却系统可以作为传统蒸发系统的替代方案,应用于太阳辐照值高的地区的温室气候控制,通过利用冷却需求和太阳能可用性之间的同时性,减少一次能源消耗。该装置由一个单效溴化锂- h2o吸收式制冷机组成,由真空管太阳能集热器供气;该模型是在Matlab-Simulink中开发的,能够以15分钟的时间步长动态模拟温室冷却需求和太阳能场的产生。目前的研究提出了一种具有分配系统的工厂配置,其中冷却功率不提供给温室的整个体积,而只提供给作物周围的空气体积,这大大节省了能源需求的减少,并且非常有效地利用了太阳能。模拟研究基于意大利南部巴里大学实验中心收集的实验数据。这项工作的目的是证明太阳能冷却系统可以为冷却温室提供重要的节能机会,通过利用冷却要求和太阳能可用性之间的同时性来减少一次能源消耗。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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