Towards a physics-based understanding of fruit frost protection using wind machines

Heusinkveld, Vincent W.J.; Hooft, Antoon van; Schilperoort, Bart; Baas, Peter; Veldhuis, Marie-Claire ten; Wiel, B.J.H. van de

doi:10.1016/j.agrformet.2019.107868

Cited by 14 publications

(16 citation statements)

References 20 publications

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“…We observed an average temperature increase in the order of 1-3 • C near the ground. This is in line with earlier studies by Ribeiro et al (2006) and Heusinkveld et al (2020) who show an increase of ∼ 2 • C. Above the canopy, the air temperature decreases. In May the temperature at 4-9 m height is lower during ON mode than during OFF mode (Fig.…”

Section: Heat Transport Into the Canopysupporting

confidence: 93%

“…Previous work has explored the effect of wind machine operation modes on air temperatures in and above the canopy, with respect to tilt angle (Battany, 2012;Beyá-Marshall et al, 2019;Heusinkveld et al, 2020), rotation time (Heusinkveld et al, 2020) and timing of the start of machine operation (Ribeiro et al, 2006). Kimura et al (2017) show how during the rotation cycle of a wind machine the plantair temperature difference varies in a tea plantation.…”

Section: Introductionmentioning

confidence: 99%

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Plant-Atmosphere Heat Exchange During Wind Machine Operation for Frost Protection

et al. 2022

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Section: Heat Transport Into the Canopysupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Plant-Atmosphere Heat Exchange During Wind Machine Operation for Frost Protection

et al. 2022

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“…The frost protection wind machine can also improve the heat exchange between the crop and the surrounding air by regulating the conductivity of leaf boundary layer (Kensuke, et al, 2017;Monteith, et al, 2013;Snyder, et al, 2005). Many studies have confirmed that frost protection windmachine could effectively raise the temperature of the canopy (Bey-Marshall, et al, 2019;Heusinkveld, et al, 2019;Wu, et al, 2015), and could as well as increase the yield and quality of crops in the covered area (Blank, et al, 1995;Hu, et al, 2013). These studies mostly confirm the reliability of frost protection by comparing the conditions inside and outside the covered area.…”

Section: Introductionmentioning

confidence: 95%

Influence of Frost Protection Windmachine with Continuous Oscillation on Microclimate in Tea Fields

Sun

et al. 2020

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To verify the influence of frost protection windmachine with continuous oscillation on microclimate, the experimental study was conducted in a tea field in Zhenjiang, China on a typical radiation frost night. Disturbed airflow variation and protection effect were investigated. Airflow velocity of 8 points at different distance from the machine was measured during an oscillation period with an anemometer, and temperature variation of 48 points at different distance from the machine and different height above the ground was measured with temperature recorders. The changes of airflow velocity and temperature were analyzed. Where the velocity was high, the airflow-disturbed duration was as well as large. Airflow velocity at each point presented a trend of rise, fluctuation, and decline under the action of windmachine with continuous oscillation. The temperature rise with the same distance from the machine was close, among which the 10 m and 20 m away from the machine increased greatly. Disturbed airflow enlarged the temperature difference between the top and the bottom of the canopy. The windmachine with continuous oscillation is proved to be effective for tea frost protection and provides more coverage than traditional anti-frost fan with flabellate oscillation.

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“…The rotor axis is usually inclined at 10 degrees to the horizontal and the rotor is yawed at constant rate of around 0.25 rpm to maximize the area protected. AFFs protect many different crops by circulating warmer air over the crop, e.g., Hu et al [1] and Heusinkveld et al [2]. Most studies of AFFs have been of their field performance, e.g.…”

Section: Introductionmentioning

confidence: 99%

Using Small Wind Turbine Technology to Design an AntiFrost Fan

Sessarego¹,

Wood

2022

J. Phys.: Conf. Ser.

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Anti-frost fans (AFFs) are widely used in agriculture to reduce the frost damage to crops. The small wind turbine rotor design code (SWRDC) was adapted to design the blades of an anti-frost fan to maximize the mass flow rate through the rotor while minimizing the blade mass and aerodynamic noise. Using a random sample set of 60 baseline designs, the design is iterated using a genetic algorithm to obtain an optimized design with a mass flow rate of 3.11 kg/s, a blade mass of 6.96 kg, and with a noise level of 72.8 dB.

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Towards a physics-based understanding of fruit frost protection using wind machines

Cited by 14 publications

References 20 publications

Plant-Atmosphere Heat Exchange During Wind Machine Operation for Frost Protection

Plant-Atmosphere Heat Exchange During Wind Machine Operation for Frost Protection

Influence of Frost Protection Windmachine with Continuous Oscillation on Microclimate in Tea Fields

Using Small Wind Turbine Technology to Design an AntiFrost Fan

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