Model-based control of CO2 concentration in greenhouses at ambient levels increases cucumber yield

Kläring, Hans‐Peter; Hauschild, C.; Heißner, A.; Bar‐Yosef, B.

doi:10.1016/j.agrformet.2006.12.002

Cited by 99 publications

(49 citation statements)

References 17 publications

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“…The greenhouse is already closed and CO 2 enrichment is applied; however, the enrichment level may not be the highest possible level allowable to the plant as in some greenhouses, the CO 2 enrichment level is limited to the ambient CO 2 concentration only [13]. Thus, it is important to investigate to what extent CO 2 enrichment level can affect the capturing performance of greenhouses.…”

Section: Effect Of Co 2 Enrichment Levelmentioning

confidence: 99%

“…Their model was restricted only to three state variables: average greenhouse air water vapor pressure, average greenhouse air temperature, and average canopy temperature. Kläring et al [13] investigated the effect of maintaining CO 2 concentration inside a closed greenhouse at the ambient level on the productivity of cucumber crop planted inside. They developed a CO 2 enrichment strategy that was based on calculating the photosynthesis rate of cucumber through an empirical photosynthesis model and supplying the corresponding amount of CO 2 to the greenhouse air.…”

Section: Introductionmentioning

confidence: 99%

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Solar greenhouses can be promising candidate for CO2 capture and utilization: mathematical modeling

Effat

Shafey

Nassib

2015

Int J Energy Environ Eng

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Solar greenhouses can be considered as efficient places for biological CO 2 capture and utilization if CO 2 enrichment becomes a common practice there. As CO 2 enrichment is applied only when greenhouses are closed, ventilated greenhouses--which represent a large percentage of greenhouses all over the world--cannot be considered for this practice. Consequently, ventilated greenhouses cannot be considered for CO 2 capture and utilization. The aim of this paper is to show--through modeling and simulation--that these ventilated greenhouses can be activated for serving as efficient CO 2 capture and utilization places if they are kept closed (to apply CO 2 enrichment) and used microclimate control methods alternative to ventilation. The paper introduces a realistic mathematical model in which all the processes and phenomena associated with the biological CO 2 capture and utilization by photosynthesis inside greenhouses are considered. The model validity and accuracy were ensured through the good agreement of its numerical predictions with the available experimental results in the literature. The effect of different environmental and planting conditions on the CO 2 capturing process (the photosynthesis process) is investigated. A case study was chosen to investigate the effects of the cooling method, cooling temperature, planting conditions, and CO 2 concentration level on the cumulative amount of captured CO 2 which represents the greenhouse capturing performance.The results show that the capturing performance of greenhouse can be enhanced from value as low as 1.0 g CO 2 / m 2 day for ventilated greenhouses with low planting density to a value as high as 140 g CO 2 /m 2 day for high planting density when alternative microclimate control methods and CO 2 enrichment are applied, considering the appropriate plant type. Additional benefits besides CO 2 capture are also discussed for the possible increase of the plant productivity and possible lowering of water consumption by plants. Keywords

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Section: Effect Of Co 2 Enrichment Levelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Solar greenhouses can be promising candidate for CO2 capture and utilization: mathematical modeling

Effat

Shafey

Nassib

2015

Int J Energy Environ Eng

View full text Add to dashboard Cite

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“…Solutions are based on instantaneous optimization (Challa and Schapendonk 1986;Critten 1991;Van Meurs and Van Henten 1994), or consider dynamics and light or photosynthesis integration (Chalabi 1992;Ioslovich et al 1995;Ferentinos, Albright and Ramani 2000;Chalabi et al 2002a). Model-based control to ambient CO 2 without economics is described by Kläring et al (2007).…”

Section: Partial Solutions: Co 2 Enrichmentmentioning

confidence: 99%

Optimal Greenhouse Cultivation Control: Survey and Perspectives

Straten

Henten

2010

IFAC Proceedings Volumes

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Abstract:A survey is presented of the literature on greenhouse climate control, positioning the various solutions and paradigms in the framework of optimal control. A separation of timescales allows the separation of the economic optimal control problem of greenhouse cultivation into an off-line problem at the tactical level, and an on-line problem at the operational level. This paradigm is used to classify the literature into three categories: focus on operational control, focus on the tactical level, and truly integrated control. Integrated optimal control warrants the best economical result, and provides a systematic way to design control systems for the innovative greenhouses of the future. Research issues and perspectives are listed as well.

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“…This will require more fundamental research in model-based optimization (e.g. Ioslovich and Gutman, 2008;Henten and Bontsema, 2008), evaluation of such control schemes (Kläring et al, 2008), implementation and experience of such schemes in practice (Markvart, et al, 2008), as well as, the transfer of knowledge from research to the growers to improve acceptance of this new technology (Buwalda et al, 2008).…”

Section: Monitoring Control and Decision Support -Wireless And Remotmentioning

confidence: 99%

Innovation in Greenhouse Engineering

Giacomelli¹,

Castilla²,

Henten³

et al. 2008

Acta Hortic.

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Innovations in greenhouse engineering are technical developments which help evolve the state-of-the-art in CEA (Controlled Environment Agriculture). They occur in response to the operational demands on the system, and to strategic changes in expectations of the production system. Influential operational factors include availability of labor, cost for energy, logistics of transport, etc. Influential strategic factors result from broader, regional issues such as environmental impact, product safety and consistency, and consumer demand. These are industry-wide concerns that have the effect of changing the production system in the long term. Global issues are becoming more influential on greenhouse production sustainability, and include less tangible issues such as social acceptance, political stability, quality of life benefits, and environmental stewardship. These offer much more complex challenges and are generally beyond the realm of engineering. However global issues do affect greenhouse engineering innovation. The most effective innovations in greenhouse engineering design, operations and management, will incorporate input from partnerships with the academic, private and public sectors of society. Furthermore, successful applications include, at least to some degree a multidisciplinary approach of the sciences, engineering and economics, while for ultimate success and sustainability, societal and political support must also be attained. For this overview of innovation in greenhouse engineering a list of influential factors, or "driving forces" affecting the development, application, evolution and acceptance of greenhouse systems have been described. The factors are similar for all greenhouse systems around the world, as they include the plant biology of the crop, the physical components of the structure and production system hardware, the management and logistics of labor and materials, and the mechanism of marketing the crop. Each greenhouse system, wherever located, must resolve similar problems for its specific application. The magnitude of the factors and their relative local importance are different for the specific sites. The design response will be introduced and related to the factors, as examples of innovation.

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Model-based control of CO2 concentration in greenhouses at ambient levels increases cucumber yield

Cited by 99 publications

References 17 publications

Solar greenhouses can be promising candidate for CO2 capture and utilization: mathematical modeling

Solar greenhouses can be promising candidate for CO2 capture and utilization: mathematical modeling

Optimal Greenhouse Cultivation Control: Survey and Perspectives

Innovation in Greenhouse Engineering

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