Design and Environmental Adjustment of Tunnel Type Greenhouse with Double PE Covers in Taiwan
Date Issued
2004
Date
2004
Author(s)
Lai, Tai-Yen
DOI
zh-TW
Abstract
This study is to make the inner environment of greenhouse suitable for plant growing under Taiwan’s climate by designing non-electric driven modules for greenhouse. Two parts, establishment of double-layer greenhouse as well as environmental experiments, are designed or undertaken analyzed as regard to a reasonable design and application of greenhouse. As to the material and structure, a tunneled style of greenhouse is created by using zinc-covered steel round pipe as the framework. Other designs include a 20cm air layer, a 30cm wind gap, a double-layer of black nets with 50% and 20% transparency, and a 0.1mm PE rubber covered in the surface. The safety analysis reveals a capacity of the greenhouse to stand for V-magnitude earthquakes and XII-magnitude hurricanes. The average consumption of steel as the framework is 4.02kg/m3, and the average cost is NT188.7/m3. As to the environment, the study discusses the temperature reduction ability in summer daytime, the heat preservation capacity in winter nights and the facility conditions under other seasons by designing experiments in the new built greenhouses in middle and low latitude area in different seasons. Results in summer experiments show that the inner temperature can be 4.3℃ lower than outside, and the heat prevention rate is 11% while the air layer is 20cm with black net of 20% transparency and the air gap is opened. Results in winter experiment conclude that the inner climate can remain stable when air gap is closed. The temperature in the daytime is 25 to 35 ℃, and it can be 1 to 3℃ higher than outside at winter nights. The simulation analysis of the air layer results that our goals can be satisfied by applying a 15cm air layer and an adjustable air gap. This design just occupied 12% of the greenhouse area and is thus space-efficient.
Subjects
雙層PE膜
空氣層
隔熱
保溫
溫室
Heat preservation
Greenhouse
Air gap
Double PE films
Heat prevention
SDGs
Type
thesis
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