Staff Publications

Staff Publications

  • external user (warningwarning)
  • Log in as
  • language uk
  • About

    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

    We have a manual that explains all the features 

    Current refinement(s):

    Records 21 - 40 / 372

    • help
    • print

      Print search results

    • export
      A maximum of 250 titles can be exported. Please, refine your queryYou can also select and export up to 30 titles via your marked list.
    Check title to add to marked list
    Duurzaam elektrisch beregenen
    Spruijt, J. ; Russchen, H.J. - \ 2015
    Lelystad : PPO AGV (Rapport / PPO-AGV 649) - 20
    akkerbouw - beregening - duurzaamheid (sustainability) - watervoorziening - elektrische kracht - zonnecollectoren - alternatieve methoden - energiegebruik - kennisoverdracht - vergelijkingen - irrigatiesystemen - arable farming - overhead irrigation - sustainability - water supply - electric power - solar collectors - alternative methods - energy consumption - knowledge transfer - comparisons - irrigation systems
    De landbouw wordt geconfronteerd met een aantal belangrijke knelpunten, onder andere klimaatverandering, de beschikbaarheid van voldoende water en afhankelijkheid van fossiele energie. Het praktijknetwerk Duurzaam elektrisch beregenen wil bijdragen aan kennisontwikkeling en kennisverspreiding over duurzame methoden van beregening. Als doel wil het praktijknetwerk beoordelen de economische en milieutechnische duurzaamheid van twee beregeningstechnieken. Als eerste de reguliere beregening met beregeningshaspel aangedreven met dieselmotor en als tweede een beregeningshaspel met een elektrische pomp voor de watervoorziening en aandrijving. Tevens wil het praktijknetwerk een dak met zonnepanelen in de optie meenemen, zodat de installatie vanuit eigen zonnepanelen kan worden voorzien van energie.
    Decision support modeling for sustainable food logistics management
    Soysal, M. - \ 2015
    Wageningen University. Promotor(en): Jack van der Vorst, co-promotor(en): Jacqueline Bloemhof-Ruwaard. - Wageningen : Wageningen University - ISBN 9789462573055 - 209
    logistiek - voedsel - voedselketens - voedselproducten - duurzaamheid (sustainability) - ketenmanagement - beslissingsondersteunende systemen - kwantitatieve analyse - voedselafval - energiegebruik - modelleren - logistics - food - food chains - food products - sustainability - supply chain management - decision support systems - quantitative analysis - food wastes - energy consumption - modeling

    Summary

    For the last two decades, food logistics systems have seen the transition from traditional Logistics Management (LM) to Food Logistics Management (FLM), and successively, to Sustainable Food Logistics Management (SFLM). Accordingly, food industry has been subject to the recent challenges of reducing the amount of food waste and raising energy efficiency to reduce greenhouse gas emissions. These additional challenges add to the complexity of logistics operations and require advanced decision support models which can be used by decision makers to develop more sustainable food logistics systems in practice. Hence, the overall objective of this thesis was to obtain insight in how to improve the sustainability performance of food logistics systems by developing decision support models that can address the concerns for transportation energy use and consequently carbon emissions, and/or product waste, while also adhering to competitiveness. In line with this overall objective, we have defined five research objectives.

    The first research objective (RO), which is to identify key logistical aims, analyse available quantitative models and point out modelling challenges in SFLM, is investigated in Chapter 2. In this chapter, key logistical aims in LM, FLM and SFLM phases are identified, and available quantitative models are analysed to point out modelling challenges in SFLM. A literature review on quantitative studies is conducted and also qualitative studies are consulted to better understand the key logistical aims and to identify the relevant system scope issues. The main findings of the literature review indicate that (i) most studies rely on a completely deterministic environment, (ii) the food waste challenge in logistics has not received sufficient attention, (iii) traveled distance is often used as a single indicator to estimate related transportation cost and emissions, and (iv) most studies propose single objective models for the food logistics problems. This chapter concludes that new and advanced quantitative models are needed that take specific SFLM requirements from practice into consideration to support business decisions and capture food supply chain dynamics. These findings motivated us to work on the following research objectives RO2, RO3, RO4 and RO5.

    RO2, which is to analyse the relationship between economic (cost) and environmental (transportation carbon emissions) performance in a network problem of a perishable product, is investigated in Chapter 3. This chapter presents a multi-objective linear programming (MOLP) model for a generic beef logistics network problem. The objectives of the model are (i) minimizing total logistics cost and (ii) minimizing total amount of greenhouse gas emissions from transportation operations. The model is solved using the e-constraint method. This study breaks away from the literature on logistics network models by simultaneously considering transportation emissions (affected by road structure, vehicle and fuel types, weight loads of vehicles, traveled distances), return hauls and product perishability in a MOLP model. We present computational results and analyses based on the application of the model to a real-life international beef logistics chain operating in Nova Andradina, Mato Grosso do Sul, Brazil, and exporting beef to the European Union. Trade-off relationships between multiple objectives are observed by the derived Pareto frontier that presents the cost of being sustainable from the point of reducing transportation emissions. The results indicate the importance of distances between actors in terms of environmental impact. Moreover, sensitivity analysis on important practical parameters show that export ports' capacities put pressure on the logistics system; decreasing fuel efficiency due to the bad infrastructure has negative effects on cost and emissions; and green tax incentives result in economic and environmental improvement.

    RO3, which is to investigate the performance implications of accommodating explicit transportation energy use and traffic congestion concerns in a two-echelon capacitated vehicle routing problem (2E-CVRP), is investigated in Chapter 4. The multi-echelon distribution strategy in which freight is delivered to customers via intermediate depots rather than using direct shipments is an increasingly popular strategy in urban logistics. Its popularity is primarily due to the fact that it alleviates the environmental (e.g., energy usage and congestion) and social (e.g., traffic-related air pollution, accidents and noise) consequences of logistics operations. This chapter presents a comprehensive mixed integer linear programming formulation for a time-dependent 2E-CVRP that accounts for vehicle type, traveled distance, vehicle speed, load, multiple time zones and emissions. A case study in a supermarket chain operating in the Netherlands shows the applicability of the model to a real-life problem. Several versions of the model, each differing with respect to the objective function, are tested to produce a number of selected Key Performance Indicators (KPIs) relevant to distance, time, fuel consumption and cost. This chapter offers insight in the economies of environmentally-friendly vehicle routing in two-echelon distribution systems. The results suggest that an environmentally-friendly solution is obtained from the use of a two-echelon distribution system, whereas a single-echelon distribution system provides the least-cost solution.

    RO4, which is to investigate the performance implications of accommodating explicit transportation energy use, product waste and demand uncertainty concerns in an inventory routing problem (IRP), is investigated in Chapter 5. Traditional assumptions of constant distribution costs between nodes, unlimited product shelf life and deterministic demand used in the IRP literature restrict the usefulness of the proposed models in current food logistics systems. From this point of view, our interest in this chapter is to enhance the traditional models for the IRP to make them more useful for decision makers in food logistics management. Therefore, we present a multi-period IRP model that includes truck load dependent (and thus route dependent) distribution costs for a comprehensive evaluation of CO2 emission and fuel consumption, perishability, and a service level constraint for meeting uncertain demand. A case study on the fresh tomato distribution operations of a supermarket chain shows the applicability of the model to a real-life problem. Several variations of the model, each differing with respect to the considered aspects, are employed to present the benefits of including perishability and explicit fuel consumption concerns in the model. The results suggest that the proposed integrated model can achieve significant savings in total cost while satisfying the service level requirements, and thus offers better support to decision makers.

    RO5, which is to analyse the benefits of horizontal collaboration in a green IRP for perishable products with demand uncertainty, is investigated in Chapter 6. This chapter presents a decision support model, which includes a comprehensive evaluation of CO2 emission and fuel consumption, perishability, and a service level constraint for meeting uncertain demand, for the IRP with multiple suppliers and customers. The model allows to analyse the benefits of horizontal collaboration in the IRP with respect to several KPIs, i.e., total emissions, total driving time, total routing cost comprised of fuel and wage cost, total inventory cost, total waste cost, and total cost. A case study on the distribution operations of two suppliers, where the first supplier produces figs and the second supplier produces cherries, shows the applicability of the model to a real-life problem. The results show that horizontal collaboration among the suppliers contributes to the decrease of aggregated total cost and emissions in the logistics system, whereas the obtained gains are sensitive to the changes in parameters such as supplier size or maximum product shelf life. According to the experiments, the aggregated total cost benefit from cooperation varies in a range of about 4-24% and the aggregated total emission benefit varies in a range of about 8-33%.

    Integrated findings from Chapters 2, 3, 4, 5 and 6 contribute to the SFLM literature by (i) reflecting the state of the art on the topic of quantitative logistic models which have sustainability considerations, (ii) providing decision support models which can be used by decision makers to improve the performance of the sustainable food logistics systems in terms of logistics cost, transportation energy use and carbon emissions, and/or product waste, and (iii) presenting the applicability of the proposed models in different case studies based on mainly real data, multiple scenarios, and analysis. The developed decision support models exploit several logistics improvement opportunities regarding transportation energy use and emissions, and/or product waste to better aid SFLM, as distinct from their counterparts in literature. To conclude, the case study implementations in this thesis demonstrate that (i) perishability and explicit consideration of fuel consumption are important aspects in logistics problems, and (ii) the provided decision support models can be used in practice by decision makers to further improve sustainability performance of the food logistics systems.

    Tomaten belichten met minder elektriciteit
    Dieleman, J.A. ; Janse, J. ; Gelder, A. de; Kempkes, F.L.K. ; Visser, P.H.B. de; Lagas, P. ; Meinen, E. ; Warmenhoven, M.G. ; Elings, A. - \ 2015
    Bleiswijk : Wageningen UR Glastuinbouw (Rapport GTB 1338) - 76
    glastuinbouw - cultuurmethoden - tomaten - solanum lycopersicum - belichting - led lampen - energiegebruik - efficiëntie - elektriciteit - reductie - gewasproductie - greenhouse horticulture - cultural methods - tomatoes - solanum lycopersicum - illumination - led lamps - energy consumption - efficiency - electricity - reduction - crop production
    Over the last 10 years, the use of electricity for assimilation lighting has increased considerably. It is now an important part of the energy use of the horticultural sector. To reverse this trend, in the lighting season 2013/2014, we conducted a trial with the aim to reduce the electricity use in a lighted tomato crop by 35% while maintaining production levels. Two treatments were applied: (1) Reference cultivation: clear glass and lighting by 50% HPS lamps and 50% LED intermittent lighting (210 µmol/m2/s), (2) energy efficient cultivation: diffuse greenhouse cover and lighting by 50% LED top lighting and 50% intermittent LED lighting (210 µmol/m2/s). In the energy efficient cultivation, 37% less electricity was used in the period October - May. However, energy use for heating in this treatment was higher to compensate for the lack of radiative heat. The light sum the plants received (sunlight + artificial lighting) was 6% lower in the energy efficient cultivation compared to the reference cultivation due to the lower number of lighting hours. However, the production difference was only 0.3 kg/m2, less than 1%! Detailed plant measurements showed hardly any differences between the treatments in light interception, light absorption by the leaves, photosynthesis and the production and distribution of assimilates. The analysis of the crop growth model showed that the effect of the lower number of lighting hours in the energy efficient cultivation was fully compensated by the positive effects of the diffuse greenhouse cover which has a higher light transmission.
    DaglichtKas maakt duurzame ambities meer dan waar
    Zwart, H.F. de - \ 2014
    Kas techniek (2014)9. - p. 12 - 15.
    glastuinbouw - kastechniek - kassen - beglazing - daglicht - energiegebruik - duurzame energie - productie - monitoring - greenhouse horticulture - greenhouse technology - greenhouses - glazing - daylight - energy consumption - sustainable energy - production - monitoring
    Vlak voor de zomer startte Ter Laak Orchids uit Wateringen met telen in de gloednieuwe DaglichtKas. Ruim een half jaar later blikken we terug op het ontstaan van dit duurzame kasconcept en kijken we naar de resultaten tot nu toe. Duidelijk is in ieder geval dat de eerste ervaringen de verwachting overtreffen.
    Protocol Energiemonitor Glastuinbouw. Versie tot en met 2013
    Velden, N.J.A. van der - \ 2014
    Den Haag : LEI Wageningen UR (LEI nota / LEI Wageningen UR 2014-025a) - 46
    glastuinbouw - kassen - energie - duurzaamheid (sustainability) - energiegebruik - warmtekrachtkoppeling - kooldioxide - emissie - nuttig gebruik - protocollen - greenhouse horticulture - greenhouses - energy - sustainability - energy consumption - cogeneration - carbon dioxide - emission - utilization - protocols
    Het LEI voert jaarlijks de Energiemonitor Glastuinbouw uit waarin de stand van de indicatoren wordt vast gesteld. Bij deze monitor behoort een Protocol. In dit Protocol zijn de definities, de conceptuele methodiek, de gebruikte databronnen en de werkwijze vastgelegd. Dit betreft de periode 2000-2013 .
    Naar energieneutrale varkensstallen met luchtrecirculatie: de Enerlatiestal = Towards energy neutral pig houses with recirculation of air: the Enerlatiestal
    Aarnink, A.J.A. ; Verhoijsen, R. ; Bokma, S. - \ 2014
    Wageningen : Wageningen UR Livestock Research (Livestock Research rapport 814) - 28
    varkens - varkenshouderij - varkensstallen - energiegebruik - energiebesparing - ventilatie - energiebalans - luchtkwaliteit - dierenwelzijn - pigs - pig farming - pig housing - energy consumption - energy saving - ventilation - energy balance - air quality - animal welfare
    A design of an energy neutral house for growing-finishing pigs was developed. The main principle is recirculation of approx. 80% of the exhaust air after cleaning and conditioning.
    EnerVatiestal: energiebesparende en - opwekkende technieken : bijdrage aan een energieneutrale stal voor de varkenshouderij
    Kasper, G.J. ; Ellen, H.H. - \ 2014
    Wageningen : Wageningen UR Livestock Research (Rapport / Wageningen UR Livestock Research 775) - 35
    energiebesparing - opwekking van elektriciteit - varkensstallen - varkenshouderij - energiegebruik - energiekosten - duurzame veehouderij - duurzame energie - energy saving - electricity generation - pig housing - pig farming - energy consumption - energy expenditure - sustainable animal husbandry - sustainable energy
    Quantifying the effect of energy saving and sustainable energy-generating techniques on energy use and energy cost in breeding and fattening pigs.
    Duurzaamheidsprestaties Greenport Westland-Oostland; Periode 2007-2012
    Ruijs, M.N.A. ; Meer, R.W. van der - \ 2014
    Den Haag : LEI Wageningen UR (Nota / LEI 14-068) - 30
    glastuinbouw - duurzaamheid (sustainability) - energiegebruik - gebiedsontwikkeling - waterbeheer - alternatieve methoden - westland - zuid-holland - indicatoren - investering - monitoring - greenhouse horticulture - sustainability - energy consumption - area development - water management - alternative methods - westland - zuid-holland - indicators - investment - monitoring
    Het programma Duurzame Greenport Westland-Oostland (DGWO) richt zich op het versterken van de economische basis van de glastuinbouw door het stimuleren van de verduurzaming. Het programma DGWO omvat een aantal initiatieven en projecten, welke gericht zijn op de transitie naar een duurzamere glastuinbouw in de Greenport Westland-Oostland. In het projectplan zijn bij de start van het programma indicatoren opgenomen om de output en effecten aan het eind van het programma te tonen. Gemeente Westland - als penvoerder van de Taskforce DGWO - heeft behoefte aan een monitoring van enkele indicatoren op het terrein van de verduurzaming van de glastuinbouw. Dit betreft de ontwikkeling van het energiegebruik, van de investeringen in R&D, en investeringen in duurzaam energie- en waterbeheer op glastuinbouwbedrijven.
    'Planten kunnen meer hebben dan we vaak denken' : Tomaat heeft geen last van hogere luchtvochtigheid in de nacht
    Staalduinen, J. van; Janse, J. ; Zwart, H.F. de - \ 2014
    Onder Glas 11 (2014)10. - p. 12 - 13.
    glastuinbouw - groenten - tomaten - solanum lycopersicum - vochtgehalte - klimaatregeling - kassen - energiegebruik - energiebesparing - gewaskwaliteit - landbouwkundig onderzoek - greenhouse horticulture - vegetables - tomatoes - solanum lycopersicum - moisture content - air conditioning - greenhouses - energy consumption - energy saving - crop quality - agricultural research
    Het onderzoek in de VenLowKas in Bleiswijk staat dit jaar in het teken van het telen bij (zeer) hoge luchtvochtigheid. De klimaatregeling is ingesteld op een vochtdeficit van 1 gram water per m3 lucht. Er zijn geen problemen geweest met Botrytis en de productie ligt duidelijk voor op vorig jaar. “De laatste vier maanden is er nauwelijks gestookt. Wij denken dat het totale energieverbruik zal uitkomen rond de 10 m3 aardgas equivalenten per m2, inclusief de elektriciteitscomponent voor luchtcirculatie”, zegt Feije de Zwart van Wageningen UR Glastuinbouw.
    Capacitive bioanodes for electricity storage in Microbial Fuel Cells
    Deeke, A. - \ 2014
    Wageningen University. Promotor(en): Cees Buisman, co-promotor(en): Bert Hamelers; Annemiek ter Heijne. - Wageningen : Wageningen University - ISBN 9789462571105 - 151
    afvalwaterbehandeling - organische stof - brandstofcellen - energiebronnen - elektriciteit - opslag - energiegebruik - elektrodes - elektrolyten - bio-energie - onderzoek - biobased economy - waste water treatment - organic matter - fuel cells - energy sources - electricity - storage - energy consumption - electrodes - electrolytes - bioenergy - research - biobased economy
    Denkend aan het opraken van de fossiele brandstoffen, wordt de noodzaak om naar hernieuwbare alternatieven te kijken alleen maar groter. Zon, wind, water en biomassa zijn al hernieuwbare bronnen die actueel gebruikt worden. Maar voor zonne-, wind- en waterenergie beperkt die discontinue aanwezigheid de verdere ontwikkeling en wordt de noodzaak voor elektriciteitsopslag benadrukt. Een andere technologie voor hernieuwbare elektriciteitsopwekking is de microbiële brandstofcel (MFC). In een MFC worden de organische bestanddelen van het afvalwater rechtstreeks in elektrische energie omgezet. MFCs zijn een opkomende technologie van de afgelopen 10 jaar en vele onderzoekers hebben onderzoek gedaan naar de verbetering van de stroomdichtheid en het vermogen. De continue verwerking van het afvalwater vraagt om opslag van het afvalwater of om opslag van de geproduceerde elektriciteit. Opslag van de elektriciteit kan bewerkstelligd worden door het combineren van een MFC met een condensator.
    Energiebelasting en de glastuinbouw
    Velden, N.J.A. van der; Smit, P.X. ; Meer, R.W. van der - \ 2014
    Den Haag : LEI Wageningen UR (Nota / LEI Wageningen UR 14-002) - 46
    glastuinbouw - aardgas - energiegebruik - energiekosten - duurzaamheid (sustainability) - geschatte kosten - tarieven - duurzame energie - reductie - greenhouse horticulture - natural gas - energy consumption - energy expenditure - sustainability - estimated costs - tariffs - sustainable energy - reduction
    Voor de Nederlandse glastuinbouw is energie een belangrijke kostenpost. Ook vanuit duurzaamheidsoogpunt zijn energiebesparing en reductie van de CO2-emissie belangrijke items. De energiebelasting (EB) op fossiele brandstoffen en elektriciteit brengt vanwege de degressieve tariefstructuur een beperkte prikkel tot energiebesparing en reductie van de CO2-emissie met zich mee. Bovendien is door de relatief kleinschalige bedrijfsstructuur, in combinatie met de degressief gestaffelde tariefstructuur, de belastingdruk (uitgedrukt in € per GJ energie en in € per € omzet aan glastuinbouwproducten) relatief hoog (Blom et al., 2010). Daarom is destijds, in samenhang met afspraken en convenanten tussen overheid en glastuinbouwsector over CO2-emissieruimtes, reductie van de CO2-emissie, verbetering van de energie-efficiëntie en verhoging van het aandeel duurzame energie, een verlaagde EB ofwel een gedeeltelijke vrijstelling van de EB op aardgas ingesteld. De verlaagde EB wordt door de Europese Commissie getoetst op geoorloofde staatssteun. Voor de toetsing van de nieuwe periode na 2014 heeft het ministerie van Economische Zaken informatie nodig rond het onderwerp energie en glastuinbouw.
    Strategies to reduce electricity consumption on dairy farms : an economic and environmental assessment
    Upton, J.R. - \ 2014
    Wageningen University. Promotor(en): Imke de Boer; Peter Groot Koerkamp, co-promotor(en): L. Shalloo. - Wageningen : Wageningen University - ISBN 9789462570771 - 171
    elektriciteit - energiegebruik - melkveehouderij - reductie - kosten - technologie - innovaties - economische analyse - milieutoets - electricity - energy consumption - dairy farming - reduction - costs - technology - innovations - economic analysis - environmental assessment

    The aim of this thesis was to assess how, and to what extent, do managerial and technology changes affect electricity consumption, associated costs and greenhouse gas (GHG) emissions of dairy farms. Dairy farms in Ireland are expected to expand in the future, due to policy incentives and the abolishment of European Union milk quotas in 2015, which will result in an increased use of resources such as land, water, and energy, and increased emissions to the environment. In order to develop strategies to reduce electricity consumption associated costs and GHG emissions, it was necessary to understand the consumption trends and the hot-spots of electricity consumption within the farm. Therefore, we performed a life cycle assessment by quantifying the energy use on 22 commercial Irish dairy farms, from cradle-to-farm-gate. This analysis demonstrated that a total of 31.7 MJ of energy was required to produce one kg of milk solids, of which 20% was direct and 80% was indirect energy use. Electricity consumption was found to represent 12% of total cradle-to-farm-gate energy use or 60% of direct energy, and was centered on milk harvesting. Following this analysis we devised two main groups of strategies, i.e. ‘cost strategies’ and ‘energy strategies’. ‘Cost strategies’ consisted of measures that could save on-farm costs but no energy or related emissions, such as, moving to a new electricity tariff or decoupling large electricity users, such as water heating, from milking times and shifting them to off-peak periods when electricity price is lower. Examples of ‘energy strategies’ are; the use of variable speed vacuum pumps on the milking machine, pre-cooling of milk and solar thermal technologies to provide hot water for cleaning purposes. A mechanistic model of electricity consumption that simulates farm equipment on an hourly and monthly basis was developed to further evaluate the ‘cost’ and ‘energy’ strategies. We used this model to show that a Day & Night electricity tariff minimised annual electricity costs, while a Flat tariff would increase the electricity costs by between 16% and 34%, depending on farm size. We also discovered that milking earlier in the morning and later in the evening reduced the simulated annual electricity consumption and related GHG emissions by between 5% and 7%, depending on farm size. An analysis of ‘energy strategies’ was carried out which revealed that that the ideal blend of technologies to maximise farm profitability while also reducing electricity consumption and GHG emissions, consisted of a direct expansion milk tank with pre-cooling of milk with well water to 15°C, electrical water heating and standard vacuum pumps. An individual farmer can also choose to increase his or her use of renewable energy by adding solar thermal water heating with the trade-off of reduced profitability and negative return on investment figures. This analysis highlighted the need for an investment appraisal approach to technology investments on dairy farms.

    Business cases Duurzame Greenport Westland-Oostland : managementsamenvatting
    Ruijs, M.N.A. ; Sewalt, K. ; Berg, G.J. van den; Janssen, E. ; Poot, E.H. - \ 2014
    Bleiswijk : Wageningen UR Glastuinbouw (Rapport / Wageningen UR Glastuinbouw 1318) - 22
    landbouwregio's - regionaal beleid - glastuinbouw - kennisoverdracht - warmteuitwisseling - geothermische energie - afvalwaterbehandeling - integraal waterbeheer - economische modellen - energiegebruik - onderzoeksprojecten - agricultural regions - regional policy - greenhouse horticulture - knowledge transfer - heat exchange - geothermal energy - waste water treatment - integrated water management - economic models - energy consumption - research projects
    Het programma Taskforce Duurzame Greenport Westland-Oostland heeft als doel het aanjagen van regionale duurzaamheidsprojecten in de Greenport Westland-Oostland. In het project Kennisoverdracht zijn zeven van dergelijke projecten als business case beschreven, die raakvlak hebben met de milieuthema’s energie of water.
    Besparing op elektriciteit met LED's 20% en hybride-belichting 6% : Teelt onder hybridebelichting nog niet rendabel
    Arkesteijn, M. ; Meinen, E. ; Dueck, T.A. - \ 2014
    Onder Glas 11 (2014)8. - p. 28 - 29.
    glastuinbouw - belichting - led lampen - kunstlicht - milieubeheersing - effecten - energiegebruik - energiebesparing - proeven - potplanten - greenhouse horticulture - illumination - led lamps - artificial light - environmental control - effects - energy consumption - energy saving - trials - pot plants
    Afgelopen najaar is gekeken naar de mogelijkheid om in de chrysantenteelt energie te besparen. Doelstelling daarbij was om door het gebruik van LED-lampen het elektriciteitsverbruik te verminderen met behoud van productie en kwaliteit. In drie aparte proefkassen is bij veertien verschillende rassen gekeken naar de resultaten onder 100% SON-T, een hybride-belichtingssysteem (half SON-T en half LED’s) en 100% LEDbelichting.
    Smart energy practices : examining how householders shape – and are shaped by – smart energy systems : informational govenance
    Spaargaren, G. ; Vliet, B.J.M. van; Horst, H.M. van der; Naus, J. - \ 2014
    Wageningen UR
    energie - energiegebruik - energiebesparing - gedrag van huishoudens - meetapparatuur - computertechnieken - elektriciteit - energy - energy consumption - energy saving - household behaviour - meters - computer techniques - electricity
    This project analyses the ways in which householders start making use of new energy and information flows, and the opportunities and threats that come along with new forms of communication and transparency.
    Van koploper energie verbruiker naar kampioen energie besparen : Nieuwe kennis ontwikkelen en toepassen (interview met Eric Poot en Jouke Campen)
    Arkesteijn, M. ; Poot, E.H. ; Campen, J.B. - \ 2014
    Onder Glas 11 (2014)5. - p. 13 - 15.
    glastuinbouw - teeltsystemen - innovaties - energiebesparing - energiegebruik - duurzame energie - kennisoverdracht - belichting - greenhouse horticulture - cropping systems - innovations - energy saving - energy consumption - sustainable energy - knowledge transfer - illumination
    Kas als Energiebron is het innovatie- en actieprogramma van de sector en de overheid om de energiedoelen binnen bereik te brengen en telers kennis in handen te geven om energie te besparen en duurzame energie in te zetten. Het programma heeft al veel innovaties opgeleverd, waarvan een flink aantal inmiddels in de praktijk wordt toegepast. Het doel van het programma is nu verbreed met grootschalige invoering van de innovaties, naast het blijven aanjagen van nieuwe ontwikkelingen. Van koploper energie verbruiker naar kampioen energie besparen: Wat is er al bereikt en wat zijn de plannen voor de toekomst?
    Energie en klimaat in de Agrosectoren
    Moerkerken, A. ; Gerlagh, T. ; Jong, G. de; Verhoog, A.D. - \ 2014
    Utrecht : Rijksdienst voor Ondernemend Nederland
    energie - landbouwsector - energiegebruik - energiebesparing - energieproductie in de landbouw - hernieuwbare energie - biobased economy - energy - agricultural sector - energy consumption - energy saving - agricultural energy production - renewable energy - biobased economy
    Dit rapport beschrijft de voortgang van het convenant ‘schone en zuinige agrosectoren’, ook wel Agroconvenant genoemd. Dit convenant is in 2008 gesloten en bevat afspraken die de agrosectoren en de overheid hebben gemaakt op het gebied van energiebesparing, hernieuwbare energie en reductie van broeikasgassen in de landbouwsectoren. Agrarische ondernemers hebben sinds de start van het convenant vele initiatieven ontplooid. De overheid zette vele instrumenten in om de doelen uit het convenant te helpen realiseren. Voorjaar 2014 evalueren de deelnemers de werking en de resultaten van het convenant.
    Scenario studies for algae production
    Slegers, P.M. - \ 2014
    Wageningen University. Promotor(en): Gerrit van Straten; Rene Wijffels, co-promotor(en): Ton van Boxtel. - Wageningen : Wageningen University - ISBN 9789461738448 - 221
    algen - algenteelt - ontwerp - fotobioreactoren - plassen - biomassa productie - biomassa - energiegebruik - bioproceskunde - algae - algae culture - design - photobioreactors - ponds - biomass production - biomass - energy consumption - bioprocess engineering

    Microalgae are a promising biomass for the biobased economy to produce food, feed, fuel, chemicals and materials. So far, large-scale production of algae is limited and as a result estimates on the performance of such large systems are scarce. There is a need to estimate large-scale biomass productivity and energy consumption, while considering the uncertainty and complexity in such large-scale systems.

    In this thesis frameworks are developed to assess 1) the productivity during algae cultivation, 2) energy consumption during the transport of resources and processing biomass to biodiesel, and 3) the frameworks are applied to estimate the impact of algae cultivation in the production of algae-based food commodities. Design, location and future scenario are applied to deal with the complexity and uncertainty arising in the various data and models used.

    The first part of this thesis focuses on the development of a productivity framework for biomass production for flat panels (Chapter 2), horizontal and vertical tubular photobioreactors (Chapter 3) and raceway ponds (Chapter 4). The framework uses bio-physics-based models to simulate the light input on the reactor surface and the light gradient inside the reactor systems. The internal light gradient depends on the reactor geometry and dimensions, and the penetration of diffuse light between parallel reactors, which includes the canyon effect, and the reflection of light from the ground surface to the reactors are incorporated as well. Specific growth rates are derived from this internal light gradient based on species-specific growth characteristics. In raceway ponds the effect of the dynamic water temperature on the specific growth rate is included.

    The productivity framework enables to study cultivation under a wide range of process conditions and reactor designs, even those which have not been yet developed or tested under outdoor conditions. The results show that regional weather conditions, solar angles and algae species are key factors in making the best choice for the specific reactor design. The productivity framework allows to optimise the reactor design (e.g. geometry, light path, distances between parallel units and height) to the regional light conditions and growth characteristics of the algae species of interest. The best biomass concentration for cultivation varies between the reactor design, location and algae species. We recommend to select species suited to growth well at the regional light angles and weather conditions. An initial global sensitivity analysis shows that the absorption coefficient, maximum specific growth rate and functional cross section of the photosynthetic apparatus are the essential parameters of the model for single flat panels. An important next step is to validate and calibrate the productivity framework using data from outdoor experiments in various reactor designs, at different locations and with several algae species.

    Algae production is strongly connected to regional weather conditions, but also to the infrastructure for resource supply and to the processing of biomass. The energy consumption for resource supply has not been quantified yet and the energy consumption of biomass processing is mostly based on fixed values. These elements are tackled in part 2 of this thesis.

    In Chapter 5the productivity framework is combined with logistic models to optimise the supply network for algae cultivation. The results show that the availability, supply and demand of resources has a dominant effect on the feasibility of regions for algae cultivation. Not all locations achieve a positive energy balance for transport and the supply logistics is essential for planning algae cultivation locations. In the Benelux many locations are feasible for algae production due to the availability of large amounts of resources, while the limited supply of CO2in southern France and the Sahara demands for plants which are scattered over the regions. For the Sahara the distance for water transport should be minimal. Still, the average transport distances are higher than commonly assumed and algae cultivation does not necessarily need to take place in proximity of CO2supply. The transport energy consumption is found to be low compared to the energy contained in algae biomass (mostly below 3%).

    Chapter 6 describesa model-based combinatorial optimisation approach for the energy-efficientprocessing of algae biomass. In this approach, mass and energy balances and additional relations are used to relate the product yield and energy consumption of process units and process routes to the processing conditions. Process routes with the highest net energy ratios are derived by optimising the process conditions of each process unit in a given superstructure. This optimisation leads to 5-38% improvement of the net energy ratio compared to fixed process conditions. The approach moreover allows a bottleneck analysis for each process route. The results show that process design should be tailor-made. The model-based approach proves to be a versatile tool for the design of efficient microalgae processing systems.

    The developed frameworks combined with scenario studies are a powerful tool to assess algae production. The presented approaches help to reduce the uncertainty in the interpretation of data and are thereby an appropriate basis to use in impact analysis. In Chapter 7this is illustrated for the production of algae protein and oil as food commodities. The design scenarios show the implications of various reactor designs, two algae species and at two locations on biomass productivity, production cost and environmental life cycle indicators.

    The achievements of this work and the new horizons from this work are discussed in Chapter 8. The results of the developed frameworks demonstrate the power of the scenario approach and show that sensible predictions and projections of biomass productivity and energy consumption for logistics and biomass processing follow from the models.

    CO2 niet meer dan genoeg: Teelt van Tomaat in 2012 bij Improvement Centre met lichtafhankelijk doseren van CO2
    Gelder, A. de; Warmenhoven, M.G. ; Dieleman, J.A. ; Klapwijk, P. ; Baar, P.H. van - \ 2014
    Bleiswijk : Wageningen UR Glastuinbouw (Rapport / Wageningen UR Glastuinbouw 1290)
    glastuinbouw - tomaten - solanum lycopersicum - energiegebruik - kooldioxide - plantenmorfologie - kennisoverdracht - plantenontwikkeling - cultuurmethoden - proeven op proefstations - lichtsterkte - greenhouse horticulture - tomatoes - solanum lycopersicum - energy consumption - carbon dioxide - plant morphology - knowledge transfer - plant development - cultural methods - station tests - light intensity
    Wageningen UR Glastuinbouw heeft met financiering van Kas als Energiebron en Samenwerken aan Vaardigheden onderzoek gedaan naar efficienter gebruik van CO2. In een kasproef bij GreenQ/Improvement Centre is een CO2 doseerstrategie getest, waarbij iets meer CO2 wordt gegeven dan er op basis van de hoeveelheid licht wordt opgenomen. Dit zorgt ervoor dat de CO2 concentratie in de kas bij open luchtramen net iets boven de buitenwaarde uit komt. Met deze doseerstrategie is met 17 kg/m² CO2 een productie gerealiseerd van 62.5 kg/m² tomaat (cultivar Komeett). Het energie gebruik was 26 m3/m². Uit de literatuur blijkt dat de weerstand die CO2 ondervindt vanuit de omgeving tot in de chloroplast, bij huidmondjes die voldoende openstaan, voor 40% bepaald wordt door het transport van CO2 door de celwand en het celvocht en voor 60% door de diffusie weerstand van kaslucht naar de intercellulaire ruimte. Een dun blad met veel sponsparenchym is daarom gunstig voor de CO2 binding. Het aantal huidmondjes per cm2 blad is daarbij minder maatgevend. Sluiting van de huidmondjes remt de fotosynthese binnen een minuut omdat de CO2 in het blad snel wordt opgebruikt. Vergelijking van de bladstructuur op twee hoogtes in het gewas met planten van hetzelfde ras in een andere proef lieten geen verschillen zien, niet in hoogte en niet in behandeling. Wageningen UR Greenhouse Horticulture developed a CO2 supply strategy in which slightly more CO2 is given than is taken up based on the amount of light. A test at GreenQ Improvement Centreresulted in a CO2 concentration in the greenhouse with open windows slightly above the outside value. With this supply strategy, 17 kg/m² CO2 supply resulted in a production level of 62.5 kg/m² tomato (cultivar Komeett). The energy consumption is 26 m3/m². When the stomata are open, the resistance of CO2 on the way from the environment into the chloroplast is for 40% determined by the transport of CO2 through the cell wall and the cytosol and for 60% by the diffusion resistance of greenhouse air to the intercellular space . A thin leaf with lots of spongy parenchym is therefore beneficial for CO2 binding. The number of stomata per cm2 leaf is therefore less important. Closing of the stomata inhibits photosynthesis within a minute because the CO2 in the leaf is then depleted. Comparison of the leaf structure at two heights in the crop with plants of the same variety in another compartment did not show differences, neither in height nor in treatment. This project was financed by Kas als Energiebron and Samenwerken aan Vaardigheden.
    Video KaEb
    Wageningen UR Glastuinbouw, ; Zwart, H.F. de - \ 2013
    You Tube
    energie - zonne-energie - glastuinbouw - kastechniek - energiebronnen - teeltsystemen - verwarmingssystemen - energiegebruik - energy - solar energy - greenhouse horticulture - greenhouse technology - energy sources - cropping systems - heating systems - energy consumption
    De kas als energiebron. Hoe kunnen we planten, groenten en bloemen telen met zo min mogelijk gebruik gebruik van kostbare hoogwaardige energie? Hoe doen we dat voor de plant zo effectief mogelijk? De oplossing vraagt om innovatief denken en ingrijpen in de glastuinbouw met onder andere een maximale benutting van de zon. Wageningen UR bouwde in Bleiswijk het Innovatie en Demonsto Centrum. De Kas als Energiebron. Drie demokassen waarmee de glastuinbouw werk maakt van haar ambitie om in 2020 alleen nog klimaatneutrale kassen te bouwen. Doel is om telers te inspireren tot duurzame oplossingen voor de klimaatneutrale teelt in hun kassen.
    Check title to add to marked list

    Show 20 50 100 records per page

     
    Please log in to use this service. Login as Wageningen University & Research user or guest user in upper right hand corner of this page.