Simulating Dynamic Control of Supplementary Lighting

Körner, Oliver; Andreassen, Andrea Utoft; Aaslyng, Jesper Mazanti

doi:10.17660/actahortic.2006.711.17

Cited by 11 publications

(8 citation statements)

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“…Comparable results for power demand in greenhouses as in scenario 3 were reported earlier (Aaslyng et al, 2006;Körner et al, 2006;Mortensen and Stromme, 1987;Seginer et al, 2006).…”

Section: Production Potentials and Energy Demand Of Simulated Scenariossupporting

confidence: 82%

“…For technical layout, supplementary lighting was applied with LED lamps installed either under the roof above the crop with an installed capacity of 80 W m -2 power and an output of 192 µmol m -2 s -1 or at an installed capacity of 110 W m -2 power and an output of 264 µmol m -2 s -1 in scenario 3 or 4, respectively. The light was controlled dynamically with setpoints generated using a daily light integral (DLI) of either 12 mol m -2 d -1 or 20 mol m -2 d -1 for greenhouse or vertical farming, Magdeburg University | Bioprocess Engineering respectively (Körner et al, 2006). In both scenarios, CO2 in the air was set to 700 µmol mol -1 and supplied according to the demand (max.…”

Section: Crop Production Systemsmentioning

confidence: 99%

See 1 more Smart Citation

Integrated cycles for urban biomass as a strategy to promote a CO₂-neutral society – a feasibility study

Meinusch

Krämer

Koerner

et al. 2021

Preprint

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Progressive global warming is one of the biggest challenges civilization is facing today. The establishment of a carbon dioxide (CO2)-neutral society based on sustainable value creation cycles is required to stop this development. The Integrated Cycles for Urban Biomass (ICU) concept is a new concept towards a CO2-neutral society. The integration of closed biomass cycles into residential buildings enable efficient resource utilization and avoid transport of biowaste. In this scenario, biowaste is degraded on-site into biogas that is converted into heat and electricity. The liquid fermentation residues are upgraded by nitrification processes (e.g., by a soiling®-process, EP3684909A1) to refined fertilizer, which can be used subsequently in house-internal gardens to produce fresh food for residents.Whereas this scenario sounds promising, comprehensive evaluations of produced amounts of biogas and food, saved CO2 and costs as well as social-cultural aspects are lacking. To assess these points, a feasibility study was performed, which estimated the material and energy flows based on simulations of the biogas process and food production.The calculations show that a residential complex with 100 persons can generate 21 % of the annual power (electrical and heat) consumption from the accumulated biowaste. The nitrogen (N) in the liquid fermentation residues enables the production of up to 6.3 t of fresh mass of lettuce per year in a 70 m2 professional hydroponic production area. The amount of produced lettuce corresponds to the amount of calories required to feed four persons for one year. Additionally, due to the reduction of biowaste transport and the in-house food and fertilizer production, 6 468 kg CO2-equivalent (CO2-eq) per year are saved compared to a conventional building. While the ICU concept is technically feasible, its costs are still 1.5 times higher than the revenues. However, the model predictions show that the ICU concept becomes economically feasible in case food prices further increase and ICU is implemented at larger scale, e.g.; at the district level. Finally, this study demonstrates that the ICU implementation can be a worthwile contribution towards a sustainable CO2-neutral society and enable to decrease the demand for agricultural land.

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“…Comparable results for power demand in greenhouses as in scenario 3 were reported earlier (Aaslyng et al, 2006;Körner et al, 2006;Mortensen and Stromme, 1987;Seginer et al, 2006).…”

Section: Production Potentials and Energy Demand Of Simulated Scenariossupporting

confidence: 82%

Section: Crop Production Systemsmentioning

confidence: 99%

Integrated cycles for urban biomass as a strategy to promote a CO₂-neutral society – a feasibility study

Meinusch

Krämer

Koerner

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…winter times has to be introduced and this will, as a side effect, maximize the use of transfer water and nutrients. A functional modelling approach would be necessary to calculate the transfer water, the energy demand for greenhouse heating, CO 2 fertilization if applicable, and artificial light without a plant production winter break Körner, Andreassen, & Aaslyng, 2006). Waren.…”

Section: Optimizing Potential Of Scenario Bmentioning

confidence: 99%

Profitability of multi‐loop aquaponics: Year‐long production data, economic scenarios and a comprehensive model case

Baganz

Staaks

et al. 2020

Aquac Res

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This case study examined the productivity and economic performance of a double recirculation aquaponic system in Germany with a total interior area of about 540 m2. Calculations were carried out as an ex post analysis based on one‐year production data. The initial situation was not profitable; therefore, two scenarios were developed, which envisaged a significantly improved productivity of the fish as well as of the plant unit and a more than threefold enlargement of the greenhouse to make maximum use of the fish effluent. An ex ante analysis was performed and showed that the second scenario was profitable with a payback period of about 12 years. On the basis of this scenario, a simple but comprehensive model case with the complete set of economic key indicators showed that aquaponics is feasible if it exploits its potential, regardless of the high initial investment costs. The model case would cover an overall space of about 2,000 m2, which is suitable for professional aquaponics in urban and peri‐urban areas with their limited space availability. Furthermore, multi‐loop aquaponics with its inherent circles fits into the circular city concept and implements resource‐efficient and sustainable food production into the urban fabric, which is important with increasing urbanization.

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“…System balance is achievable by increasing the daily light integral (i.e. sum of mol light received during a 24-h period) with dynamic supplementary lighting control (Körner et al 2006).…”

Section: Role Of the Distillation Unitmentioning

confidence: 99%

Decoupled Aquaponics Systems

Goddek¹,

Joyce

Wuertz

et al. 2019

Aquaponics Food Production Systems

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Traditional aquaponics systems were arranged in a single process loop that directs nutrient-rich water from fish to the plants and back. Given the differing specific nutrient and environmental requirements of plants and fish, such systems presented a compromise to the ideal conditions for rearing of both, thus reducing the efficiency and productivity of such coupled systems. More recently, designs that allow for decoupling of units provide for a more finely tuned regulation of the process water in each of the respective units while also allowing for better recycling of nutrients from sludge. Suspended solids from the fish (e.g. faeces and uneaten feed) need to be removed from the process water before water can be directed to plants in order to prevent clogging of hydroponic systems, a step that represents a significant loss of total nutrients, most importantly phosphorus. The reuse of sludge and mobilization of nutrients contained within that sludge present a number of engineering challenges that, if addressed creatively, can dramatically increase the efficiency and sustainability of aquaponics systems. One solution is to separate, or when there are pathogens or production problems, to isolate components of the system, thus maximizing overall control and efficiency of each component, while

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Simulating Dynamic Control of Supplementary Lighting

Cited by 11 publications

References 0 publications

Integrated cycles for urban biomass as a strategy to promote a CO₂-neutral society – a feasibility study

Integrated cycles for urban biomass as a strategy to promote a CO₂-neutral society – a feasibility study

Profitability of multi‐loop aquaponics: Year‐long production data, economic scenarios and a comprehensive model case

Decoupled Aquaponics Systems

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Simulating Dynamic Control of Supplementary Lighting

Cited by 11 publications

References 0 publications

Integrated cycles for urban biomass as a strategy to promote a CO2-neutral society – a feasibility study

Integrated cycles for urban biomass as a strategy to promote a CO2-neutral society – a feasibility study

Profitability of multi‐loop aquaponics: Year‐long production data, economic scenarios and a comprehensive model case

Decoupled Aquaponics Systems

Contact Info

Product

Resources

About

Integrated cycles for urban biomass as a strategy to promote a CO₂-neutral society – a feasibility study

Integrated cycles for urban biomass as a strategy to promote a CO₂-neutral society – a feasibility study