Heating and dehumidification in production greenhouses at northern latitudes: energy use

Kempkes, F.L.K.; Zwart, H.F. de; Muñoz, Pere; Montero, J.I.; Baptista, F.J.; Giuffrida, F.; Gilli, C.; Stępowska, A.; Stanghellini, C.

doi:10.17660/actahortic.2017.1164.58

Cited by 16 publications

(12 citation statements)

References 11 publications

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“…Using a heat harvesting system was predicted to save 297 MJ m -2 year -1 , which is in line with the findings of Kempkes et al (2017), who estimated that 250 MJ m -2 year -1 can be saved by heat harvesting in a Dutch tomato greenhouse, and Ntinas et al (2020), who found a reduction of 290 MJ m -2 with heat harvesting for a tomato crop in Germany. The greenhouse with LEDs of 200 µmol m -2 s -1 required an energy input 1,388 MJ m -2 , which is 527 MJ m -2 less than a comparable greenhouse in Chapter 4 (the LED greenhouse without temperature adjustment in Figure 4.8).…”

Section: Comparison Of Model Predictions With Previous Findingssupporting

confidence: 83%

“…Designing a greenhouse for reduced energy use can include installing a highly insulating greenhouse cover, setting a north-south orientation that maximizes the absorption of sunlight in winter (Hemming, Bakker, et al, 2019), or selecting the best set of greenhouse equipment for a desired goal ( Van 't Ooster et al, 2008;Vanthoor, 2011). Equipment and technology for reduced energy use includes insulating thermal screens (Dieleman & Kempkes, 2006), mechanical dehumidification and heat exchangers (Kempkes et al, 2017), and heat storage systems which create a so-called closed or semi-closed greenhouse. These systems include short term heat storage buffers that extract energy during the day and release it at night (Seginer et al, 2017;Van Beveren et al, 2020), or long term underground heat storage to extract energy in summer and release it in winter (De Zwart, 2012;Van Ooteghem, 2007).…”

Section: High-tech Greenhouses and The Greenhouse Energy Problemmentioning

confidence: 99%

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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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Section: Comparison Of Model Predictions With Previous Findingssupporting

confidence: 83%

Section: High-tech Greenhouses and The Greenhouse Energy Problemmentioning

confidence: 99%

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

Katzin¹

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“…Humidity-control methods for greenhouses can be classified as active or passive (Figure 3). Kempkes et al [167] evaluated three standard dehumidification strategies for greenhouses in cold climates: (i) exchange of dry, outside air through ventilation, (ii) condensation on a cold surface and (iii) using hygroscopic materials to adsorb moisture. A summary of humidity-control approaches used for various climatic zones is given in Table 2.…”

Section: Humidity-control Methods Suitable For Protected Croppingmentioning

confidence: 99%

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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“…T ras < T gh ), or by utilizing the geothermal well for aquaculture production when greenhouse production has little to no heat demand. (Graamans et al 2018;Katsoulas et al 2015;Kempkes et al 2017;Luo et al 2005). An extensive description of KASPRO can be found in De Zwart, (1996).…”

Section: Wpr-968mentioning

confidence: 99%

GEOFOOD - Energy model of geothermalgreenhouse aquaponic systems, Part I, Model description and applications

Boedijn¹,

Baeza²,

Poot³

2020

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Dit rapport bevat een beschrijving van het aquaponics model dat is ontwikkeld binnen het EU-project GEOFOOD.Energiemodellen voor de productie in kassen en recirculerende aquacultuur systemen zijn gecombineerd om te evalueren hoe er optimaal gebruik kan worden gemaakt van een geothermische bron. Het model kan worden ingezet als een ontwikkelingstool om het directe gebruik van geothermische warmte binnen aquaponics, en daarmee de agri-food sector te stimuleren.

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Heating and dehumidification in production greenhouses at northern latitudes: energy use

Cited by 16 publications

References 11 publications

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

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

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

GEOFOOD - Energy model of geothermalgreenhouse aquaponic systems, Part I, Model description and applications

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