Modelling and experimental verification of a solar-powered liquid desiccant cooling system for greenhouse food production in hot climates
Modelling and experimental verification of a solar-powered liquid desiccant cooling system for greenhouse food production in hot climates
复制标题
DOI：
10.1016/j.energy.2012.02.021
复制
发表时间：
2012-04
期刊：
影响因子：
9
通讯作者：
George Lychnos;P. Davies
中科院分区：
文献类型：
--
作者：
George Lychnos;P. Davies
实验和理论建模已经进行了预测的太阳能液体除湿冷却系统的温室的性能。我们在实验室中使用MgCl 2干燥剂测试了系统的两个组件：（i）在太阳模拟器下测试的再生器和（ii）安装在测试管道中的干燥器。对再生器和干燥器建立了理论模型，并与实验结果进行了比较。验证的计算机模型被用来预测整个系统的性能在炎热的夏季在孟买，吉大港，麝香，墨西拿和哈瓦那。以温带，亚热带，热带和耐热热带作物（生菜，大豆，番茄和黄瓜分别）为例，我们估计的系统使生长季节的扩展。与传统的蒸发冷却相比，干燥剂系统在炎热季节将平均每日最高温度降低5.5-7.5 °C，足以保持生菜全年的生长条件。在番茄、黄瓜和大豆的情况下，该系统在大多数夏季月份都能实现最佳种植。它的结论是，这一概念在技术上是可行的，值得通过在适当的位置试点安装测试。
Experiments and theoretical modelling have been carried out to predict the performance of a solar-powered liquid desiccant cooling system for greenhouses. We have tested two components of the system in the laboratory using MgCl2desiccant: (i) a regenerator which was tested under a solar simulator and (ii) a desiccator which was installed in a test duct. Theoretical models have been developed for both regenerator and desiccator and gave good agreement with the experiments. The verified computer model is used to predict the performance of the whole system during the hot summer months in Mumbai, Chittagong, Muscat, Messina and Havana. Taking examples of temperate, sub-tropical, tropical and heat-tolerant tropical crops (lettuce, soya bean, tomato and cucumber respectively) we estimate the extensions in growing seasons enabled by the system. Compared to conventional evaporative cooling, the desiccant system lowers average daily maximum temperatures in the hot season by 5.5–7.5 °C, sufficient to maintain viable growing conditions for lettuce throughout the year. In the case of tomato, cucumber and soya bean the system enables optimal cultivation through most summer months. It is concluded that the concept is technically viable and deserves testing by means of a pilot installation at an appropriate location.