A solar cooling system for greenhouse food production in hot climates
A solar cooling system for greenhouse food production in hot climates
复制标题
DOI：
10.1016/j.solener.2005.02.001
复制
发表时间：
2005-01-01
期刊：
影响因子：
6.7
通讯作者：
Davies, PA
中科院分区：
文献类型：
--
作者：
Davies, PA
这项研究的动机是在非常炎热的国家种植作物的困难，以及一些这样的国家依赖进口粮食的趋势。液体干燥与太阳能再生被认为是一种手段，降低温度的蒸发冷却温室。以前的研究证明了干燥蒸发过程的技术可行性，但主要是在人类住宅的背景下。在所提出的循环中，空气在进入蒸发冷却器之前被干燥。这降低了空气的湿球温度。冷却是通过使用再生器来帮助温室部分遮荫。干燥的热量在温室的出口处被传递和排出。根据阿布扎比的天气数据，对该周期进行了分析，并给出了海湾气候的结果。以温带作物（莴苣），热带作物（番茄）和耐高温的热带作物（黄瓜）为例，我们估计相对于（i）简单风扇通风的温室（ii）传统蒸发冷却的温室生长季节的延长。与备选方案（二）相比，拟议的系统将夏季最高温度降低5摄氏度。这将使生菜的最佳种植季节从一年中的3个月延长到6个月，番茄和黄瓜的最佳种植季节从7个月延长到全年。(c)2005爱思唯尔有限公司保留所有权利。
This study is motivated by the difficulty of cultivating crops in very hot countries and by the tendency for some such countries to become dependent on imported food. Liquid desiccation with solar regeneration is considered as a means of lowering the temperature in evaporatively-cooled greenhouses. Previous studies demonstrated the technical feasibility of the desiccation-evaporation process, but mainly in the context of human dwellings. In the proposed cycle, the air is dried prior to entering the evaporative cooler. This lowers the wet-bulb temperature of the air. The cooling is assisted by using the regenerator to partially shade the greenhouse. The heat of desiccation is transferred and rejected at the outlet of the greenhouse. The cycle is analysed and results given for the climate of the The Gulf, based on weather data from Abu Dhabi. Taking examples of a temperate crop (lettuce), a tropical crop (tomato) and a tropical crop resistant to high temperatures (cucumber) we estimate the extension in growing seasons relative to (i) a greenhouse with simple fan ventilation (ii) a greenhouse with conventional evaporative cooling. Compared to option (ii), the proposed system lowers summers maximum temperatures by 5 degrees C. This will extend the optimum season for lettuce cultivation from 3 to 6 months of the year and, for tomato and cucumber, from 7 months to the whole year. (c) 2005 Elsevier Ltd. All rights reserved.