Heat transfer performance of an assembled multilayer wall in a Chinese solar greenhouse considering humidity

Zhang, Guangpeng; Shi, Yan; Liu, Hui; Fei, Zhongyu; Liu, Xin; Wei, Min; Liu, Fusheng; Wang, Shaojie

doi:10.1016/j.est.2020.102046

Cited by 17 publications

(1 citation statement)

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“…The structure and materials of the north wall were studied based on passive heating theory [18]. Many studies focus on the combination of building materials for walls [19,20], the application of specialty materials [21,22] and the development of phase change materials [23][24][25][26][27]. These studies provide a variety of options for the north wall of CSGs, and contribute to the issue of the environment balance of CSGs.…”

Section: Introductionmentioning

confidence: 99%

An Air Convection Wall with a Hollow Structure in Chinese Solar Greenhouses: Thermal Performance and Effects on Microclimate

et al. 2022

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A Chinese solar greenhouse (CSG) is a horticultural facility that uses solar energy to promote a growth environment for crops and provides high-efficiency thermal storage performance to meet the demand of vegetables’ growth in winter. Besides being an important load-bearing structure in CSGs, the north wall is a heat sink, storing during the day in order to act as a heat source during the night. At times, the night temperature is lower than the minimum growth temperature requirement of vegetables, and the additional heating is needed. Therefore, optimizing the heat storage and release performance of the north wall in a CSG is an important approach for improving growth environment and reducing consumption of fossil fuel. This study proposes a heat storage north wall with a hollow layer on the basis of air convection, aiming to optimize the utilization of solar energy in CSGs. By the air convection effects, the hollow layer collects and stores surplus solar energy in the air during the day and transfers it to the cultivation space for heating at night. Additionally, field tests were conducted to compare the natural and forced convection strategies via airflow and heat transfer efficiency. The final effect on the indoor temperature ensured that the lowest temperatures at night were above 5 °C under both the natural and forced convection strategies during the winter in the Beijing suburbs where the average minimum temperature is below −10.8 °C during the experimental period. The hollow structure improves the utilization efficiency of solar energy in CSGs and ensures winter production efficiency in northern China.

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