Study of the application of solar chimneys combined with earth-air heat exchangers ventilation system (SEVS) in a solar greenhouse

Wenjun Lei, Jingshuai Liu, Jing Zhao, Xinye Qi, Chuanmin Tai, Linhua Zhang and Angui Li

Energy, 2025, vol. 334, issue C

Abstract: Opening the top vent for natural ventilation is often used in traditional solar greenhouses in winter. However, the temperature adjustment in greenhouses often cannot meet expectations. In this study, the SEVS was applied in the experimental solar greenhouse. Effects of the SEVS on the air velocity and temperature distribution in the greenhouse were investigated using experimental and numerical methods. The results showed that the SEVS enhanced the natural ventilation of the greenhouse. When the distances among solar chimneys and among earth-air heat exchangers were all 4.6–6 m, the air distribution was relatively uniform with an average air velocity of 0.259–0.481 m/s and an indoor temperature of 24–24.9 °C, which met the growth requirements of tomatoes. However, the air velocity at the vents of earth-air heat exchangers was large, ranged from 1.86 m/s to 1.93 m/s, which had negative impact on crop growth near the vents. The vents of earth-air heat exchangers were improved. The results showed that when the width of the vent was 0.5 m and the length was 3∼4 m, the air velocity in the crop areas near the vents could be maintained below 0.5 m/s, and the indoor air distribution could also be improved. Field tests demonstrate that the soil temperature stabilizes at approximately 16 °C at a depth of 1.2 m below the ground, enabling the SEVS to maintain the temperature environment required for the growth of crops such as tomatoes when outdoor temperatures exceed 2 °C.

Keywords: Solar greenhouse; Solar chimney combined with earth-air heat exchanger ventilation system (SEVS); Air velocity; Temperature distribution; Vent; Applicable temperature range (search for similar items in EconPapers)
Date: 2025
References: Add references at CitEc
Citations:

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0360544225031792
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:334:y:2025:i:c:s0360544225031792

DOI: 10.1016/j.energy.2025.137537

Access Statistics for this article

Energy is currently edited by Henrik Lund and Mark J. Kaiser

More articles in Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().