|Table of Contents|

Study on Temperature Variation Characteristics of Cob Wall in Solar Greenhouse in Winter(PDF)

《北方园艺》[ISSN:1001-0009/CN:23-1247/S]

Issue:
2013年23期
Page:
50-54
Research Field:
Publishing date:

Info

Title:
Study on Temperature Variation Characteristics of Cob Wall in Solar Greenhouse in Winter
Author(s):
HU Jing-juan1；FAN Gui-sheng2
1.College of Environmental Science and Engineering，Taiyuan University of Technology，Taiyuan，Shanxi 030024；
2.College of Hydraulic Science and Engineering，Taiyuan University of Technology，Taiyuan，Shanxi 030024
Keywords:
solar greenhouse; cob wall; temperature; change rule
PACS:
S 625
DOI:
-
Abstract:
The stratification temperature of cob wall，stratification temperature of ground soil in solar greenhouse and air temperature inside and outside the solar greenhouse were determined，temperature variation characteristics of cob wall and reason of influence on temperature distribution were analyzed.The results showed that stratification temperature of cob wall changes period in sine or cosine within a certain.Responses of skin layer of cob wall to air temperature were obvious；on the contrary，responses of deep layer of cob wall to air temperature were not obvious.With the increase of distance to the cob wall surface，amplitude of temperature wave gradually decreased.The lag phenomenon appeared like occurrence time of the minimum and maximum value.The temperature of about 120 cm soil within the cob wall remained unchanged and amplitude of temperature wave was minimal，which illustrated that there was constant temperature layer within the cob wall.The amplitude of temperature wave in the cob wall was larger than that of the same layer in the soil of the same layer and the temperature in the cob wall was higher than in the same layer，which was resulted in the differences of thermal diffusivity.Cob wall was heat receiver in the whole day and played a good role of heat storage；the ground soil in a certain period of night was heat releaser，and played a role of keeping the indoor temperature.The temperature distribution rule of cob wall in the different period of the whole day was that with the increase of distance to the interior surface of the cob wall，the temperature decreased progressively.

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Last Update: 2014-08-16