The Research of Double Layering PE films Greenhouse on Energy-Saving in Subtropical Region
Date Issued
2007
Date
2007
Author(s)
Chang, Li-Ping
DOI
zh-TW
Abstract
This research aims to study of double layering PE films greenhouse on energy-saving in subtropical region. The experiment focuses on the effects of heat-prevention and heat-preservation under different conditions of sheltering, open and close of airflow within air gap, cover and uncover of double-layering PE films of walls, and the install of additional nets within air gap. The result of summer shelter and wall covering control indicates that the interior heat absorbability is effectively reduce when double-layering sliver nets, the inner and outer opens of airflow are opened, and a 20cm-height air gap is caused; PE films of walls are opened, and sliver nets are installed within the air gap and are moisturized. The heat-insulation rate is 24-32％ and 29-36％ during the day and night, respectively. The light transmittance and the interior temperature lower than 30℃ is 11-12％ and 8.2℃, respectively, lower than the outdoors. The result of adjustments of roof and walls in winter shows that when shelters are removed, opens of airflow are closed, and a 20cm-height air gap is caused; walls are covered with PE films, and sliver nets are installed horizontally in the ceiling height of 200cm, the heat-absorbing rate is 55％ during the day time, and heat-loss rate is 37.7％ during the night; the interior temperature is 4.5℃ higher than outside; the light transmittance is 41％.
Subjects
溫室
雙層PE膜
空氣層
隔熱
保溫
greenhouse
double-layering PE film
air gap
heat-insulation
heat- preservation
Type
thesis