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Effect of Greenhouse Cooling and Transplant Quality Using Geothermal Heat Pump System  

Lee, Jae-Han (Protected Horticultural Experiment Station, NHRI, RDA)
Lee, Yong-Beom (Nation Institute of Agricultural Engineering RDA)
Kwon, Joon-Kook (Protected Horticultural Experiment Station, NHRI, RDA)
Kang, Nam-Jun (Protected Horticultural Experiment Station, NHRI, RDA)
Kim, Hak-Joo (Protected Horticultural Experiment Station, NHRI, RDA)
Choi, Young-Hah (Protected Horticultural Experiment Station, NHRI, RDA)
Park, Jin-Myeon (Protected Horticultural Experiment Station, NHRI, RDA)
Rhee, Han-Cheol (Protected Horticultural Experiment Station, NHRI, RDA)
Publication Information
Journal of Bio-Environment Control / v.15, no.3, 2006 , pp. 211-216 More about this Journal
Abstract
This study was carried out to investigate the effect of greenhouse cooling by a geothermal heat pump system on greenhouse temperature and growth of vegetable transplants in summer season. Greenhouse air temperature in day time was $3-4^{\circ}C$ lower in fog plus shading system than in shading, while in night time that was $5-7^{\circ}C$ lower in geothermal heat pump (GHP) plus shading system compared to shading or fogplus shading. system. Plant height of cucumber, tomato and hot pepper transplants was shortened in GHP plus shading compared to shading or fog plus shading system. And Leaf area and dry weight were slightly decreased in GHP plus shading compared to the other systems. Therefore, healthy transplant index on cucumber, tomato and hot pepper was higher in GHP plusshading than in shading or fogplusshading system.
Keywords
fog; geothermal; heat exchange system; heat pump;
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