Design challenges of agricultural greenhouses in hot and arid environments – A review

Ghаni, Sаud; Bakochristou, Foteini; El-Bialy, E.; Gamaledin, Seifelislam Mahmoud Ahmad; Rashwan, Mohammed; Abdelhalim, Ayman Mohamed; Ismail, Salaheldin

doi:10.1016/j.eaef.2018.09.004

Cited by 106 publications

(57 citation statements)

References 241 publications

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“…Closed horticultural production systems have recently garnered much attention given their higher yield and resource efficiency [18,70]. However, as described above, these systems require microclimate control and illumination, which are both energy intensive [71,72].…”

Section: Climate Control In Closed Greenhouses and Plant Factoriesmentioning

confidence: 99%

“…Harbick and Albright [70] compared energy use in greenhouses and plant factories in different climatic conditions in the United States, where greenhouses were cooled using an evaporative pad and the plant factories were cooled using a chiller. Their analysis showed that plant factories were more energy intensive than greenhouses for all the climatic conditions tested.…”

Section: Climate Control In Closed Greenhouses and Plant Factoriesmentioning

confidence: 99%

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Protected Cropping in Warm Climates: A Review of Humidity Control and Cooling Methods

2019

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The projected increase of the world’s population, coupled with the shrinking area of arable land required to meet future food demands, is building pressure on Earth’s finite agricultural resources. As an alternative to conventional farming methods, crops can be grown in protected environments, such as traditional greenhouses or the more modern plant factories. These are usually more productive and use resources more efficiently than conventional farming and are now receiving much attention—especially in urban and peri-urban areas. Traditionally, protected cropping has been predominantly practised in temperate climates, but interest is rapidly rising in hot, arid areas and humid, tropical regions. However, maintaining suitable climatic conditions inside protected cropping structures in warm climates—where warm is defined as equivalent to climatic conditions that require cooling—is challenging and requires different approaches from those used in temperate conditions. In this paper, we review the benefits of protected cropping in warm climates, as well as the technologies available for maintaining a controlled growing environment in these regions. In addition to providing a summary of active cooling methods, this study summarises photovoltaic (PV)-based shading methods used for passive cooling of greenhouses. Additionally, we also summarise the current humidity-control techniques used in the protected cropping industry and identify future research opportunities in this area. The review includes a list of optimum growing conditions for a range of crop species suited to protected cropping in warm climates.

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Section: Climate Control In Closed Greenhouses and Plant Factoriesmentioning

confidence: 99%

Section: Climate Control In Closed Greenhouses and Plant Factoriesmentioning

confidence: 99%

Protected Cropping in Warm Climates: A Review of Humidity Control and Cooling Methods

2019

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“…CFD modeling of different parameters in greenhouses has been used to examine various features such as vent configuration [4]; natural and mechanical ventilation [5,6]; ventilation in screenhouses [7]; condensation, transpiration, and heat and mass transfer [8][9][10]; and, more recently, calefaction and HCVA [11] and their interactions [12,13]. The analyses of these systems allow for climate control, thereby offering the possibility to provide large numbers of high-quality crops with greater predictability.…”

Section: Computational Fluid Dynamics (Cfd) In a Greenhouse Simulationmentioning

confidence: 99%

CFD Simulation of Heat and Mass Transfer for Climate Control in Greenhouses

Rodriguez¹,

Velázquez²

2019

Heat and Mass Transfer - Advances in Science and Technology Applications

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Greenhouse plant production involves a number of processes such as transpiration, condensation, photosynthesis, and climate control. Such processes, in turn, set off mass and heat transfer phenomena that influence not only the quality and quantity of crop production but also its environmental cost. While these processes have considerably been analyzed in separate, they strongly interact with one another. For instance, increased radiation (mainly thermal infrared) increases temperature, reduces humidity, consequently increases transpiration, and affects CO 2 exchange as well as other reaction rates. Computational fluid dynamics (CFD) is a numerical tool with a solid physical basis which allows, through the construction of a computational model, to simulate the fluid flow environment. Heating, ventilation, and condensation have been analyzed in the greenhouse environment with CFD techniques. The current challenge is the interaction of these processes and their impact on the production system. The present work summarizes some CFD investigations carried out in this topic, in order to analyze the processes of heat and mass transfer in a greenhouse for agronomic purposes.In greenhouse crop production, climate has peculiar considerations, because the most important data is the impact of the environmental factors on the crop cycle. The cultivation of plants requires a sufficient amount of light, a specific range of temperature, humidity, and CO 2 , among other requirements. These requirements are primarily influenced by the greenhouse design and size and vary according to the local climate conditions. For instance, the radiation quantity inside the greenhouse depends on whether greenhouses are built with PVC or glass, because the surface material is the element to optimally use solar radiation for the required lighting [1].Recently, heating, ventilation, and air conditioning (HVAC) systems have been extensively used in urban spaces, such as offices or stores, at agriculture area, and specifically in greenhouses. For instance, HVAC has been used in buildings in order to analyze the optimization and comfort inner Officine's and several uses. In greenhouses, the concept is incipient, even though the application of the ventilation and calefaction systems as a method to climate control in cold and warm regions is nothing new.The climate produced in a greenhouse is the result of complex mechanisms involving the processes of heat and mass exchange. The internal climate is strongly dependent on the outside conditions, especially in unheated greenhouses. In greenhouse climate models, the parameters of the internal climate such as air, soil, and crop temperatures as well as air humidity are calculated using energy and water vapor balances for the various components of the system [2].Climate in the greenhouse is a consequence of radiation crossing the cover material, usually plastic. After that, climate condition is a strong relationship between several factors, temperature, humidity, wind velocity, and the solar radiation. Environ...

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“…Many attempts are made by researchers all around the world to design a greenhouse that provides suitable climate for growing crops. Excellent summery for these researches work can be found in the recent review paper authored by Ghani., et al [5].…”

Section: Introductionmentioning

confidence: 97%

Implementation of Micro-Climate Greenhouse for Hot and Arid Regions by Utilizing Geothermal Energy

Akour¹,

Alyassi²,

Alshamsi³

et al. 2019

Act Scie Agri

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According to Table 6 the underground water is not suitable for irrigating crops [20]. The underground compositions may affect the devices, such as heat exchangers, which may cause a corrosion, so proper material should be used for manufacturing the radiators for large scale projects. Underground water test Water composition Water inlet to the radiator Water conductivity (ms/cm) 3.95 TDS (mg/L) 1975 PH 7.68 Where TDS (mg/L)=0.5x1000xEC (mS/cm) Table 6: Underground water analysis. Greenhouse cooled by underground water as working fluid was constructed. The system is controlled using active control system that adjust itself based on the greenhouse temperature for cooling and soil moisture for irrigation. Conclusion 178

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Design challenges of agricultural greenhouses in hot and arid environments – A review

Cited by 106 publications

References 241 publications

Protected Cropping in Warm Climates: A Review of Humidity Control and Cooling Methods

Protected Cropping in Warm Climates: A Review of Humidity Control and Cooling Methods

CFD Simulation of Heat and Mass Transfer for Climate Control in Greenhouses

Implementation of Micro-Climate Greenhouse for Hot and Arid Regions by Utilizing Geothermal Energy

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