|Table of Contents|

Wind Effect and Hygrothermal Performance of Multi-span Arched Plastic Greenhouses

《北方园艺》[ISSN:1001-0009/CN:23-1247/S]

Issue:
2021年17
Page:
49-58
Research Field:
Publishing date:

Info

Title:
Wind Effect and Hygrothermal Performance of Multi-span Arched Plastic Greenhouses
Author(s):
LYU Xin1; XU Yuqing1; WANG Shaojie1; 2; JIA Cong2; WU Kun3; WEI Min2
(1.College of Water Conservancy and Civil Engineering，Shandong Agricultural University，Tai′an，Shandong 271018；2.College of Horticulture Science and Engineering，Shandong Agricultural University，Tai′an，Shandong 271018；3.College of Mechanical and Electronic Engineering，Shandong Agricultural University，Tai′an，Shandong 271018)
Keywords:
multi-span arched plastic greenhouse; wind pressure coefficient; natural ventilation; environment control of the arched plastic greenhouse; microclimate
PACS:
-
DOI:
10.11937/bfyy.20205336
Abstract:
Taking 2-,3- and 4-span arched greenhouses as experimental greenhouses,the combination of in-situ observation and CFD analysis is adopted,the wind resistance,ventilation and hygrothermal performance of the three kinds of arched greenhouses were studied,in order to provide a reference for the rational selection of the number of multi-span arched greenhouses for Rain-shelter-cultivation in summer by summarizing the temporal and spatial evolution laws of the microenvironment in the greenhouses.The results showed that with the increasing of the number of multi-span,the air flow blocking effect on the periphery of the middle span roof was enhanced.The air passage in the greenhouses significantly affected the temporal and spatial distribution of temperature and relative humidity,and the outlet wind speed decreased with the increasing of the number of multi-span.The more number of multi-span,the higher the temperature and relative humidity of the side span near the air outlet,and the non-uniformity of the temperature distribution was greater than the relative humidity.Taking the monitoring points close to the air outlet as an example,the temperature and relative humidity of 2-,3-and 4-span arched greenhouses were 30.44 ℃,31.07 ℃,31.82 ℃ and 60.99%,61.72%,62.59% respectively.For the multi-span arched greenhouses planted tomato in this study,fully opening the lateral vent could guide the airflow mainly through the height of the mature tomato canopy,so that the temperature and relative humidity at the canopy were the lowest in the vertical direction,which was conducive to rain shelter cultivation in high temperature season in summer.In order to achieve better natural ventilation effect and land usage ratio,it is suggested that 2-,3-span arched greenhouses should be adopted for shelter cultivation for avoiding rain in summer.

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Last Update: 2021-12-09