الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
This study aimed to using geothermal energy in heating and cooling of agricultural structures. The greenhouse is taken here as a case study. To achieve that, geothermal energy system was analysed and restructured as three sub models: soil temperature model, ETAHE model and greenhouse model. Model development, validation and experimentation were performed. The most important results obtained could be summarized as follows:
6.1. Model validation
Geothermal energy system has been presented which consists of three sub models: soil temperature model, ETAHE model and greenhouse model. Soil temperature model was developed using previous researches and adjusted to suit Egyptian conditions. It was validated against two sets of data. The first set obtained by Kassem (1999) and the second set measured by field experiment carried out in the present work. The results shown good agreement with measurements in both cases. Where, the root mean squares of deviations of the first set at 1.5 and 2 m depths were 1.93 and 1.85 °C respectively and the normalized root mean squares of deviations to the mean of the predicted data at 1.5 and 2 m depths were 0.10 and 0.09 respectively and the root mean squares of deviations of the second set at 2, 3 and 4 m depth were 2.65, 1.65 and 0.39 °C, respectively and the normalized root mean squares of deviations to the mean of the predicted data at 2, 3 and 4 m depth were 0.14, 0.09 and 0.02, respectively. This soil temperature model was used as a component of ETAHE model.