行政院國家科學委員會專題研究計畫成果報告:溼熱氣候區綠建築及農用設施外殼應用誘導式阻熱之節能與經濟設計研究
Date Issued
2004
2004-07-31
Date
2004
2004-07-31
Author(s)
DOI
922211E002093
Abstract
It is a pressing task for solving the problem in which the biomass production
decline sharply due to the overheated inner temperature in double-layer covered
greenhouse during summer season in Taiwan. Up to now,the most frequent applied
cover materials for double-layer greenhouses are PE film and PVC wave plank.
However, reference about methods on decreasing air temperature between the
double layers remains insufficient and thus needs to be fulfilled. This research
is focused on air cooling between the double layers and designs modules by
applying the characteristics of two materials, nozzle and meshes. After
comparing data from 74 design modules,the optimal energy-saving and temperature
reduction model is identified. It reveals that among various modules covered
by PVC wave planks, the best way is by leaving the air layer to 10cm in which
black nets of 80% transparency was stuffed inside as well as a compliance of
humid condition and a closed air gap. It will reduce 15.8℃ of the temperature,
and the heat absorbing rate is 61.5%. As to the modules covered by PE rubber,the
best way is by leaving the air layer to 20cm in which black nets of 80%
transparency was stuffed inside as well as a compliance of humid condition but
an opened air gap. It will reduce 12.3℃ of the temperature, and the heat
absorbing rate is 82.1%. From the requirement of lights,it shows that modules
without installations have higher transparency of lights. The highest rate is
about 68.6% with 10cm air layer in which no installations are assembled as well
as an opened air gap.
Subjects
Greenhouse
Double-layer cover
Heat separation
Temperature reduction
Air gap
Publisher
臺北市：國立臺灣大學生物環境系統工程學系暨研究所
Type
report
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