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Solar Energy Utilisation for Providing and Maintaining Optimal Microclimatic Conditions of Greenhouse Cucumber

机译：利用太阳能为温室黄瓜提供和维持最佳的微气候条件

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摘要

The main goal of the present study was to evaluate the effects of two different glazing materials (fiberglass and polyethylene) on microclimatic conditions of gable-even-span single greenhouses at night during the winter season of 2007-2008. A complete solar heating system was utilized for heating the cucumber greenhouses located in the eastern area of the coastal delta, Egypt. Temperatures of inside and outside air, water in the storage tank, pipe surface of heat exchanger, floor surface (concrete), and air relative humidity were measured and recorded on a data-logger to analyze their correlation with the cucumber crop yield response. A mathematical model was developed to simulate microclimatic conditions for the cucumber greenhouse. The data showed that the daily average solar energy available was 13.345 kWh of which 7.138 kWh was stored in the storage tank of each solar energy system. There were daily variations during the experimental period that depended upon the water temperature in the storage tank at the beginning of each day, the ambient air temperature, the rate of heat energy consumed at night to provide and maintain the air temperature within the greenhouses at the desired level, and the growth stage of the cucumber crop. The daily average heat energy consumed at night for heating the two greenhouses was 10.070 and 12.391 kWh and the polyethylene greenhouse consumed heat energy greater than the fiberglass greenhouse by 23.05 %. The heat energy consumed resulted in an increase of the inside air temperatures above the outside (12.6 °C) by 4.5 °C and 3.4 °C for fiberglass and polyethylene greenhouses, respectively. Under these conditions, the fiberglass and polyethylene covers provided, respectively, a heating effect of 4.5 °C and 3.4 °C. The nightly average air relative humidity inside and outside the two greenhouses was 56.5 %, 60.8 % and 54.4 %, respectively. The proportions of heat energy provided by utilizing the solar energy system for the two greenhouses, respectively, were 65.95 % and 55.68 %. Due to the optimal level of microclimatic conditions of the two greenhouses, they produced a fresh cucumber yield of 6.825 and 5.245 kg/m2, respectively. Thus, the fiberglass greenhouse increased the fresh yield of cucumbers by 30.12 % as compared with the polyethylene greenhouse.
机译：本研究的主要目的是评估两种不同的玻璃材料（玻璃纤维和聚乙烯）对2007-2008年冬季夜间山墙甚至连栋单温室的微气候条件的影响。利用完整的太阳能加热系统来加热位于埃及沿海三角洲东部地区的黄瓜温室。测量室内和室外空气温度，储水箱中的水，热交换器的管道表面，地面（混凝土）和空气相对湿度，并将其记录在数据记录仪中，以分析它们与黄瓜作物产量响应的相关性。建立了数学模型来模拟黄瓜温室的微气候条件。数据显示，每日平均可用太阳能为13.345 kWh，其中7.138 kWh存储在每个太阳能系统的储罐中。在实验期间，每天都有变化，这取决于每天开始时储水箱中的水温，环境空气温度，夜间提供和维持温室大棚空气温度所消耗的热能比率。所需水平，以及黄瓜作物的生长阶段。晚上加热两个温室的日平均热能分别为10.070和12.391 kWh，聚乙烯温室的热能比玻璃纤维温室大23.05％。所消耗的热能导致玻璃温室和聚乙烯温室的内部空气温度分别比外部温度（12.6°C）高4.5°C和3.4°C。在这些条件下，玻璃纤维和聚乙烯覆盖层分别提供4.5°C和3.4°C的加热效果。两个温室内外的夜间平均空气相对湿度分别为56.5％，60.8％和54.4％。利用太阳能系统为两个温室提供的热能比例分别为65.95％和55.68％。由于两个温室的最佳微气候条件水平，它们分别产生了6.825和5.245 kg / m2的新鲜黄瓜产量。因此，与聚乙烯温室相比，玻璃纤维温室使黄瓜的新鲜产量提高了30.12％。

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  • 来源
    《AMA》 |2011年第3期|p.76-84|共9页
  • 作者

    SalahM. Abdellatif; AhmedH.Silim;

  • 作者单位

    Agricultural Engineering Department Mansoura University EGYPT;

    Agricultural Engineering Department Mansoura University EGYPT;

  • 收录信息 美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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