Cooling performance assessment of horizontal earth tube system and effect on planting in tropical greenhouse
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Author list: Mongkon S., Thepa S., Namprakai P., Pratinthong N.
Publisher: Elsevier
Publication year: 2014
Journal: Energy Conversion and Management (0196-8904)
Volume number: 78
Start page: 225
End page: 236
Number of pages: 12
ISSN: 0196-8904
Languages: English-Great Britain (EN-GB)
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Abstract
The benefit of geothermal energy is used by the horizontal earth tube system (HETS); which is not prevalent in tropical climate. This study evaluated geothermal cooling ability and parameters studied in Thailand by mathematical model. The measurement of the effect on plant cultivation was carried out in two identical greenhouses with 30 m2 of greenhouse volume. The HETS supplied cooled air to the model greenhouse (MGH), and the plant growth results were compared to the growth results of a conventional greenhouse (CGH). The prediction demonstrated that the coefficient of performance (COP) in clear sky day would be more than 2.0 while in the experiment it was found to be moderately lower. The parameters study could be useful for implementation of a system for maximum performance. Two plants Dahlias and head lettuce were grown satisfactory. The qualities of the plants with the HETS were better than the non-cooled plants. In addition, the quality of production was affected by variations of microclimate in the greenhouses and solar intensity throughout the cultivation period. ฉ 2013 Elsevier Ltd. All rights reserved.
Keywords
Greenhouse
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