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Energy Saving by Led Lighting in Greenhouses: A Process-based Modelling Approach.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Energy Saving by Led Lighting in Greenhouses: A Process-based Modelling Approach./
作者:	Katzin, David.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2021,
面頁冊數:	322 p.
附註:	Source: Dissertations Abstracts International, Volume: 83-05, Section: B.
Contained By:	Dissertations Abstracts International83-05B.
標題:	Greenhouses. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28760911
ISBN:	9798494453853

Energy Saving by Led Lighting in Greenhouses: A Process-based Modelling Approach.
Katzin, David.

Energy Saving by Led Lighting in Greenhouses: A Process-based Modelling Approach. - Ann Arbor : ProQuest Dissertations & Theses, 2021 - 322 p.

Source: Dissertations Abstracts International, Volume: 83-05, Section: B.

Thesis (Ph.D.)--Wageningen University and Research, 2021.

This item must not be sold to any third party vendors.

High-tech greenhouses, equipped with heating, lighting, and CO2 enrichment of the air, are major consumers of energy. This energy consumption is responsible for considerable carbon emissions, contributing to global warming, which is already occurring at alarming rates. Light-emitting diodes (LEDs) have been promoted as a potential solution to the energy problem of illuminated greenhouses, due in great part to their high efficacy in converting electrical energy to light. Current LEDs consume around 40% less electricity than the commonly used high-pressure sodium (HPS) lamps, while emitting equivalent light intensities.Despite their high efficacy, adoption of LEDs in greenhouses has been limited. High investment costs, lack of knowledge regarding the influence of LEDs on the greenhouse climate and crop, and low trust towards their claimed benefits, have all been cited as main obstacles for adoption. It has also been observed that greenhouses with LEDs require more heating than greenhouses with HPS lamps. This is because lamps provide not only light but also heat to the greenhouse. Due to their higher efficacy, LEDs contribute less heat to the greenhouse, which needs to be compensated by the heating system. Therefore, it has so far been unclear precisely how much energy can be saved by a transition to LEDs in greenhouses, and what factors contribute to this potential saving.This thesis explores how LEDs influence the energy consumption of greenhouses. It investigates the consequence of replacing HPS lamps by LEDs in terms of lighting demand, heating demand, and total energy use; analyzes how LEDs influence the greenhouse climate and energy balance; and examines further possibilities for energy saving by LEDs in future scenarios.Chapter 1 provides an overview of the greenhouse energy problem, and uses the Netherlands as an example to present some of the approaches that have so far been used to tackle this problem. This chapter also shows that the advent of LEDs in greenhouses has been accompanied by great expectations, the majority of which have so far failed to materialize. This chapter suggests that a transparent and quantitative assessment of the potential benefits of LEDs will help adjust expectations towards this new lighting technology, as well as promote trust amongst growers. Process-based mathematical modelling is proposed as a method towards achieving these goals.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 tha odel development is in itself a valuable research goal.

ISBN: 9798494453853Subjects--Topical Terms:

1530611
Greenhouses.

Energy Saving by Led Lighting in Greenhouses: A Process-based Modelling Approach.
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520 $a High-tech greenhouses, equipped with heating, lighting, and CO2 enrichment of the air, are major consumers of energy. This energy consumption is responsible for considerable carbon emissions, contributing to global warming, which is already occurring at alarming rates. Light-emitting diodes (LEDs) have been promoted as a potential solution to the energy problem of illuminated greenhouses, due in great part to their high efficacy in converting electrical energy to light. Current LEDs consume around 40% less electricity than the commonly used high-pressure sodium (HPS) lamps, while emitting equivalent light intensities.Despite their high efficacy, adoption of LEDs in greenhouses has been limited. High investment costs, lack of knowledge regarding the influence of LEDs on the greenhouse climate and crop, and low trust towards their claimed benefits, have all been cited as main obstacles for adoption. It has also been observed that greenhouses with LEDs require more heating than greenhouses with HPS lamps. This is because lamps provide not only light but also heat to the greenhouse. Due to their higher efficacy, LEDs contribute less heat to the greenhouse, which needs to be compensated by the heating system. Therefore, it has so far been unclear precisely how much energy can be saved by a transition to LEDs in greenhouses, and what factors contribute to this potential saving.This thesis explores how LEDs influence the energy consumption of greenhouses. It investigates the consequence of replacing HPS lamps by LEDs in terms of lighting demand, heating demand, and total energy use; analyzes how LEDs influence the greenhouse climate and energy balance; and examines further possibilities for energy saving by LEDs in future scenarios.Chapter 1 provides an overview of the greenhouse energy problem, and uses the Netherlands as an example to present some of the approaches that have so far been used to tackle this problem. This chapter also shows that the advent of LEDs in greenhouses has been accompanied by great expectations, the majority of which have so far failed to materialize. This chapter suggests that a transparent and quantitative assessment of the potential benefits of LEDs will help adjust expectations towards this new lighting technology, as well as promote trust amongst growers. Process-based mathematical modelling is proposed as a method towards achieving these goals.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 tha odel development is in itself a valuable research goal.
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