A comparative study on the environmental impact of greenhouses: A probabilistic approach

Golzar, Farzin; Heeren, Niko; Hellweg, Stefanie; Roshandel, Ramin

doi:10.1016/j.scitotenv.2019.04.092

Cited by 17 publications

(10 citation statements)

References 34 publications

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“…), and the application of high-technology systems (hydroponics, automation, IoT, etc.) for cultivating leafy and fruiting vegetables [1]. As a recent development in controlled environment systems, vertical farming systems inherits advanced greenhouse technologies for growing vegetables and valuable plants in fully controlled environmental conditions and in multiple shelf layers to increase crop yield per unit area.…”

Section: Introductionmentioning

confidence: 99%

Effects of White LED Lighting with Specific Shorter Blue and/or Green Wavelength on the Growth and Quality of Two Lettuce Cultivars in a Vertical Farming System

et al. 2021

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White (W) light-emitting diode (LED) light has been used as an efficient light source for commercial plant cultivation in vertical farming. This study aimed to examine the effect of W LED light sources on the growth and quality of butterhead and romaine lettuce. Three W LED light sources including normal W light (NWL) which has 450 nm as its pumping wavelength and two specific W lights (SWL1 and SWL2) with shorter blue peak wavelength (437 nm) were used to grow lettuce in comparison to a red (R) and blue (B) LED combination. As a result, SWL1 and SWL2 treatments with the same electrical power or photosynthetic photon flux density (PPFD) resulted in more growth of both lettuce cultivars compared to RB treatment. Some phenolic and flavonol contents were increased in the RB treatment, whereas SWL2 treatment stimulated the accumulation of other phenolic and flavonol compounds. Meanwhile, neither NWL nor SWL1 treatments increased the individual phenolic and flavonol contents in either cultivar (except for some flavonols in romaine lettuce in the SWL1 group). In addition, light and energy use efficiencies were also highest in the SWL1 and SWL2 treatments. These results illustrate the positive effects of specific W LED light on lettuce growth and quality, and suggest that the specific W LED light sources, especially SWL2, could be preferably used in vertical farming.

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Section: Introductionmentioning

confidence: 99%

Effects of White LED Lighting with Specific Shorter Blue and/or Green Wavelength on the Growth and Quality of Two Lettuce Cultivars in a Vertical Farming System

et al. 2021

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“…El conocimiento de las necesidades hídricas de los cultivos posibilita conseguir una gestión adecuada del agua de riego con la máxima eficiencia [1]. Mediante la estimación del balance hídrico a escala de cultivo se establece la demanda de agua a lo largo del ciclo de vida del cultivo [2]. Este balance se obtiene estimando las entradas y salidas de agua que se producen a escala del cultivo y añadiendo por riego las cantidades perdidas.…”

Section: Introductionunclassified

Empleo simultáneo de la fotografía digital y medidas en campo para el seguimiento del estado fenológico en lechuga (Lactuca Sativa L CV Neruda)

López¹,

Canales²,

Mateos³

et al. 2019

Congreso Ibérico De Agroingeniería

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“…Relatively few models considered photosynthesis (9 of 24) and yield (8 of 24), and approaches varied between those that did. Ahamed et al (2018bAhamed et al ( , 2018c) Golzar et al (2018Golzar et al ( , 2019 Design Ven New Abbes et al (2010).…”

Section: Composition Of Process-based Greenhouse Climate Modelsmentioning

confidence: 99%

Energy saving by LED lighting in greenhouses : A process-based modelling approach

Katzin¹

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Chapter 2 investigates the discipline of process-based greenhouse modelling. The chapter shows that a considerable number of greenhouse models are being published, and sets out to understand the reasons for the existence of this multitude of models. In Section 2.2, substantial background on the concept of process-based greenhouse modelling is provided, and a general structure of these models is proposed. Subsequently, modelling studies published between 2018 and 2020 are analyzed according to this general structure. The studies are categorized according to their objectives, types of greenhouse they describe, and equipment they consider, and a model inheritance chart is presented, showing how current models are based on earlier works. Moreover, a comparison of modelling validation studies is performed. Based on this analysis, possible reasons for the abundance of greenhouse models are suggested, including a lack of model transparency and code availability, and a belief that model development is in itself a valuable research goal. The chapter ends with several recommendations for the future advancement of the discipline. These include promoting model transparency and availability of source code, and establishing shared datasets and evaluation benchmarks.Chapter 3 presents GreenLight, a process-based model for a greenhouse with a tomato crop, which describes the influence of HPS lamps and LEDs on the climate, crop, and energy use. In this chapter, GreenLight's performance is evaluated by comparing model predictions against data from two greenhouse compartments, one with HPS lamps and one with LEDs. The model is found to have a relative error in predictions of climate and energy use in the range of 1-12%. In order to promote transparency, the model is offered in an open source format at https://github.com/davkat1/GreenLight. In this way, the model is made available for inspection and extension by others.Chapter 4 uses GreenLight to predict the influence of replacing HPS lamps by LEDs in a greenhouse. A wide range of scenarios is considered, including varying climates, from subtropical China to arctic Sweden, and multiple settings for indoor temperature, lamp intensity, lighting duration, and insulation. In all scenarios, LEDs are found to reduce the energy demand for lighting by 40%, but to increase the demand for heating. This results in the total energy saving by transition to LEDs to be in the range of 10-25% for the majority of scenarios considered. An important factor influencing how much energy can be saved by a transition to LEDs is found to be the ratio between the lighting and heating demand of the greenhouse before the transition. Summary xiiiChapter 5 presents a novel concept for greenhouse climate control: heating a greenhouse by light. Considering the observation that all lamps provide heat as well as light, this chapter suggests that illuminating at high light intensities could eliminate the need to heat the greenhouse by the heating system. This approach could potentially be very efficient, as it utili...

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A comparative study on the environmental impact of greenhouses: A probabilistic approach

Cited by 17 publications

References 34 publications

Effects of White LED Lighting with Specific Shorter Blue and/or Green Wavelength on the Growth and Quality of Two Lettuce Cultivars in a Vertical Farming System

Effects of White LED Lighting with Specific Shorter Blue and/or Green Wavelength on the Growth and Quality of Two Lettuce Cultivars in a Vertical Farming System

Empleo simultáneo de la fotografía digital y medidas en campo para el seguimiento del estado fenológico en lechuga (Lactuca Sativa L CV Neruda)

Energy saving by LED lighting in greenhouses : A process-based modelling approach

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