Abstract
The greenhouse environment suitable for crop growth usually depends on reasonable ventilation, and outdoor air flow state and indoor crop height are important factors affecting the ventilation effect. This study conducted simulation and experimental research on corn cultivation in an eight-span plastic greenhouse, analyzing the effects of outdoor wind speed, wind direction, and indoor crop height variations on the uniformity of temperature and relative humidity distribution as well as the air flow dynamics within the greenhouse. The study shows that as outdoor wind speed increases from 0.5 m/s to 2.5 m/s, for every 1 m/s increment, temperatures decrease by 2.2 °C and 0.9 °C, respectively. The increase in outdoor wind speed resulted in uniformity of greenhouse temperature and humidity along the vertical height, but exacerbated the degree of inhomogeneity in the east-west direction. The change in outdoor wind direction leads to differences in airflow direction and ventilation volume. On the south side of the greenhouse, while temperature is lower, the relative humidity is higher, with maximum differences in temperature and humidity between the north and south sides being 0.6 °C and 1.5 %, respectively, when the northeast wind blows. The east wind has the best cooling effect. The uneven degree of temperature and humidity distribution in the east and west direction of the greenhouse is positively correlated with crop height. This study can provide valuable insights for adjusting and optimizing natural ventilation strategies in large multi-span greenhouses.
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Claims 8
Claim · model-written summary
Increasing outdoor wind speed lowered greenhouse temperatures by 2.2 °C and 0.9 °C per 1 m/s increment.
- Taxon
- corn
Zea mays subsp. mayst0 - Outcome
- temperaturese0
- Direction
- decreasee0
- Value
- 2.2 °C and 0.9 °Ce0
- Setting
- outdoor wind speede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“as outdoor wind speed increases from 0.5 m/s to 2.5 m/s, for every 1 m/s increment, temperatures decrease by 2.2 °C and 0.9 °C, respectively”
t0“corn height”
Claim · model-written summary
Higher outdoor wind speed made temperature and humidity more uniform vertically.
- Taxon
- cornZea mays subsp. mayst0
- Outcome
- uniformity of greenhouse temperature and humidity along the vertical heighte0
- Setting
- outdoor wind speede0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The increase in outdoor wind speed resulted in uniformity of greenhouse temperature and humidity along the vertical height”
t0“corn height”
Claim · model-written summary
Higher outdoor wind speed worsened east–west inhomogeneity.
- Taxon
- cornZea mays subsp. mayst0
- Outcome
- degree of inhomogeneitye0
- Direction
- exacerbatede0
- Setting
- east-west directione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but exacerbated the degree of inhomogeneity in the east-west direction”
t0“corn height”
Claim · model-written summary
Wind direction changed airflow direction and ventilation volume.
- Taxon
- cornZea mays subsp. mayst0
- Outcome
- differences in airflow direction and ventilation volumee0
- Setting
- outdoor wind directione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The change in outdoor wind direction leads to differences in airflow direction and ventilation volume”
t0“corn height”
Claim · model-written summary
The south greenhouse side had lower temperature.
- Taxon
- cornZea mays subsp. mayst0
- Outcome
- temperaturee0
- Direction
- lowere0
- Setting
- south side of the greenhousee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“On the south side of the greenhouse, while temperature is lower”
t0“corn height”
Claim · model-written summary
The south greenhouse side had higher relative humidity.
- Taxon
- cornZea mays subsp. mayst0
- Outcome
- relative humiditye0
- Direction
- highere0
- Value
- 1.5 %e0
- Setting
- northeast winde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the relative humidity is higher, with maximum differences in temperature and humidity between the north and south sides being 0.6 °C and 1.5 %, respectively, when the northeast wind blows”
t0“corn height”
Claim · model-written summary
East wind gave the best cooling.
- Taxon
- cornZea mays subsp. mayst0
- Outcome
- best cooling effecte0
- Direction
- beste0
- Setting
- east winde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The east wind has the best cooling effect”
t0“corn height”
Claim · model-written summary
East–west temperature and humidity unevenness increased with crop height.
- Taxon
- cornZea mays subsp. mayst0
- Organ / stage
- crop heighte0
- Outcome
- uneven degree of temperature and humidity distributione0
- Direction
- positively correlatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The uneven degree of temperature and humidity distribution in the east and west direction of the greenhouse is positively correlated with crop height”
t0“corn height”