Comprehensive review on dehumidification strategies for agricultural greenhouse applications

Temperature and humidity control are crucial in next generation greenhouses. Plants require optimum temperature/humidity and vapor pressure deficit conditions inside the greenhouse for optimum yield. In this regard, an air-conditioning system could provide the required conditions in harsh climatic regions. In this study, the authors have summarized their published work on different desiccant and evaporative cooling options for greenhouse air-conditioning. The direct, indirect, and Maisotsenko cycle evaporative cooling systems, and multi-stage evaporative cooling systems have been summarized in this study. Different desiccant materials i.e., silica-gels, activated carbons (powder and fiber), polymer sorbents, and metal organic frameworks have also been summarized in this study along with different desiccant air-conditioning options. However, different high-performance zeolites and molecular sieves are extensively studied in literature. The authors conclude that solar operated desiccant based evaporative cooling systems could be an alternate option for next generation greenhouse air-conditioning.

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“…Muhammad Sultan 1 * † , Hadeed Ashraf 1 † , Takahiko Miyazaki 2,3 , Redmond R. Shamshiri 4 and Ibrahim A. Hameed 5…”

Section: Conclusion and Summarymentioning

confidence: 99%

Temperature and Humidity Control for the Next Generation Greenhouses: Overview of Desiccant and Evaporative Cooling Systems

Sultan¹,

Ashraf²,

Miyazaki³

et al. 2021

Next-Generation Greenhouses for Food Security

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“…According to the difference of greenhouse temperature and RH, the dew point in the greenhouse can be calculated by function (1).…”

Section: Calculate Dew Pointmentioning

confidence: 99%

“…The first is that vents on the roof and walls of the greenhouse were opened to dissipate the hot air. It depends on the natural circulation of air and low outdoor temperature [1]. However, the outdoor temperature in Taizhou in July and August was very high, the air vent was very small, and the vent was often closed because of rain or strong sunlight.…”

Section: Introductionmentioning

confidence: 99%

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Cost-effectiveness analysis of greenhouse dehumidification and integrated pest management using air’s water holding capacity-a case study of the Trella Greenhouse in Taizhou, China

Tianning

2021

E3S Web Conf.

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Greenhouse technology is becoming an indispensable and feasible solution for modern crop production methods. Technological progress has reduced the impact of severe weather conditions on greenhouse crop yields in high temperature climate. Cooling and dehumidifying are the key to ensure the required temperature and humidity range inside the greenhouse. The purpose of this work is to evaluate the dehumidification technologies used in the agricultural industry. The theoretical and practical aspects of greenhouse cooling technology are shown: working principles, conditions and performance. The primary humidity control method utilized in greenhouses is evaporative cooling by using air’s water holding capacity. According to the experimental results, the quantitative analysis was carried out from the perspective of energy and cost, which demonstrated that the evaporative cooling fan-pad system was also an effective method of greenhouse cooling in humid climate. This work would provide technical support or the optimisation of the energy management of greenhouses in humid climates and recommend the mathematical model in future work.

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“…Meteorological conditions are crucial factors that determine the crop growth and leaf development (Zhou et al, 2020;Nawaz R. et al, 2020). Facility agriculture is an e cient crop production through the precise regulating of microclimate within the greenhouse (Kempkes et al, 2017;Amani et al, 2020;Guo et al, 2021). Clarifying the relationships between plant physiological and ecological indicators and meteorological conditions are the basis method for quantitative assessing of agro-meteorological conditions, assessing the agro-meteorological disaster losses, predicting the yield, and applying the intelligent micrometeorology control of agricultural production.…”

Section: Introductionmentioning

confidence: 99%

Response of Population Canopy Color Gradation Skewed Distribution Parameters of the RGB model to Micrometeorology Environment in Begonia Fimbristipula Hance

Zhang¹,

Chen²,

Wang³

et al. 2021

Preprint

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Background: The high quality and efficient production of greenhouse vegetation depend on the micrometeorology environmental adjusting such as the system warming, illumination supplement. In order to improve the quantity, quality and efficiency of greenhouse vegetation, it is necessary to figure out the relationship between the crop growth conditions and environmental meteorological factors, which could give constructive suggestions for precise control of greenhouse environment and reducing the running cost. The parameters from the color information of plant canopy reflect the internal physiological conditions, thus, RGB model has been widely used in the color analysis of digital pictures of leaves.Results: The color scale for single leaf, single plant, and the populate canopy of Begonia Fimbristipula Hance (BFH) photographs are all have a skewed cumulative distribution histograms. The color gradation skewness-distribution (CGSD) parameters of the RGB model were increased from 4 to 20 after the skewness analysis, which greatly expanded the canopy leaf color information and could simultaneously describe the depth and distribution characteristics of canopy color. The 20 CGSD parameters were sensitive to the micrometeorology factors, especially to the radiation and temperature accumulation. The multiple regression models of mean, median, mode and kurtosis parameters to microclimate factors were established, and the spatial models of skewness parameters were optimized.Conclusions: The models constructed based on the color gradation skewness-distribution (CGSD) parameters of the RGB model, can well explain the response of canopy color to microclimate factors and can be used to monitor the variation of plant canopy color under different micrometeorology.

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Comprehensive review on dehumidification strategies for agricultural greenhouse applications

Cited by 77 publications

References 95 publications

Temperature and Humidity Control for the Next Generation Greenhouses: Overview of Desiccant and Evaporative Cooling Systems

Temperature and Humidity Control for the Next Generation Greenhouses: Overview of Desiccant and Evaporative Cooling Systems

Cost-effectiveness analysis of greenhouse dehumidification and integrated pest management using air’s water holding capacity-a case study of the Trella Greenhouse in Taizhou, China

Response of Population Canopy Color Gradation Skewed Distribution Parameters of the RGB model to Micrometeorology Environment in Begonia Fimbristipula Hance

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