|Table of Contents|

Effect of North Wall Length Variation of Greenhouse on  Thermal Environment of Solar Greenhouse in Lanzhou

《北方园艺》[ISSN:1001-0009/CN:23-1247/S]

Issue:
2018年07
Page:
53-59
Research Field:
Publishing date:

Info

Title:
Effect of North Wall Length Variation of Greenhouse on  Thermal Environment of Solar Greenhouse in Lanzhou
Author(s):
GAO Xuting1; GUAN Yong1; YANG Huijun1; BAI Jie1; ZHANG Renli1; HU Wenju2
(1.School of Environmental and Municipal Engineering, Lanzhou Jiaotong University，Lanzhou,Gansu 730070;2.Beijing Key Lab of Heating,Gas Supply Ventilating and Air Conditioning Engineering,Beijing University of Civil Engineering and Architecture,Beijing 100044)
Keywords:
solar greenhouse; north wall; length; shadow rate; daily heat release/storage; cumulative daily effective accumulated temperature
PACS:
-
DOI:
10.11937/bfyy.20173459
Abstract:
The solar greenhouse in Lanzhou was used as the study object,and the model of solar greenhouse was established and verified by the experimental results，to simulate and analyze the effect of the length of greenhouse north wall on the thermal environment under different weather conditions.The shadow rate of the north wall, the daily heat release/storage of the solar greenhouse and cumulative daily effective accumulated temperature were used as evaluating indicators to explore the effect of the length of greenhouse north wall on the indoor thermal environment.The results showed that the shadow of north wall was caused by the east wall and the west wall of solar greenhouse.The shadow rate was symmetrical at 13:00.When the insulation quilt was opened or closed, the shadow rate of north wall was the largest and with the increase in the length of greenhouse wall, its shadow rate gradually reduced at other times.Under different length of the north wall and retaining the other structural parameters of solar greenhouse, the ratio of daily heat release/storage was nonlinearly related to the solar radiation intensity and the length of north wall.When the daily heat release was equal to the daily heat storage, the suitable length of the north wall of solar greenhouse was from 89.4 m to 102.5 m in Lanzhou.Moreover, the cumulative daily effective accumulated temperature had a power function relationship with the length of north wall, the larger the length of the north wall, and the lower the cumulative daily effective accumulated temperature.

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Last Update: 2018-04-19