A method to quantify the energy-saving performance of greenhouse screen materials

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Screens used in practice are made from various material compositions (woven fabrics, knitted fabrics, foils, open or closed structures, transparent, diffuse, aluminized, various colours) and for various purposes (energy saving, reduction in light sum, or diffuse light obscuration). An important goal of the use of screens in Dutch greenhouses is to save energy. Unfortunately, to date, there is no objective method to determine the energy-saving performance of a material under standardized conditions. Energy-saving rates are estimated by manufacturers using different methods. Growers have no way of comparing material performances independently in order to make a proper investment decision. In the current research, the goal was to develop a method to quantify the energy-saving performance of greenhouse screen materials under standardized conditions. The method is based on the scientific literature and expertise of different screen producers and growers. The research focused on the three main aspects that affect energy saving of a screen: 1) thermal radiation losses, determined by the emissivity and reflectivity for thermal infrared radiation; 2) air permeability, which determines heat convection losses, characterized at a wide range of air velocities to account for velocities by buoyancy through materials as well as for velocities by forced convection caused by internal fans; and 3) water vapour permeability, which determines latent heat losses, determined under temperature, humidity and air velocity conditions normally encountered in commercial greenhouses. For all aspects, different measurement methods were compared to choose the best method based on reproducibility, accuracy and practicability. Screen material properties were then fed into both steady-state and validated dynamic greenhouse climate models to calculate overall screen energy saving under well-defined conditions. In the current research, different screen materials from different producers were investigated. The paper describes the methodology developed and shows data on different screen materials.

LanguageEnglish
Pages221-229
JournalActa Horticulturae
Volume1227
DOIs
Publication statusPublished - 1 Jan 2018

Fingerprint

greenhouses
energy
methodology
heat
air
growers
permeability
thermal radiation
infrared radiation
woven fabrics
foil
climate models
fans (equipment)
water vapor
reproducibility
humidity
color
temperature
convection

Keywords

  • Air permeability
  • Dynamic greenhouse model
  • Emission
  • Energy saving
  • Greenhouse screens
  • Thermal infrared transmission
  • Water vapour permeability

Cite this

@article{95ae64d2cdd344d0933ca16aca7fe162,
title = "A method to quantify the energy-saving performance of greenhouse screen materials",
abstract = "Screens used in practice are made from various material compositions (woven fabrics, knitted fabrics, foils, open or closed structures, transparent, diffuse, aluminized, various colours) and for various purposes (energy saving, reduction in light sum, or diffuse light obscuration). An important goal of the use of screens in Dutch greenhouses is to save energy. Unfortunately, to date, there is no objective method to determine the energy-saving performance of a material under standardized conditions. Energy-saving rates are estimated by manufacturers using different methods. Growers have no way of comparing material performances independently in order to make a proper investment decision. In the current research, the goal was to develop a method to quantify the energy-saving performance of greenhouse screen materials under standardized conditions. The method is based on the scientific literature and expertise of different screen producers and growers. The research focused on the three main aspects that affect energy saving of a screen: 1) thermal radiation losses, determined by the emissivity and reflectivity for thermal infrared radiation; 2) air permeability, which determines heat convection losses, characterized at a wide range of air velocities to account for velocities by buoyancy through materials as well as for velocities by forced convection caused by internal fans; and 3) water vapour permeability, which determines latent heat losses, determined under temperature, humidity and air velocity conditions normally encountered in commercial greenhouses. For all aspects, different measurement methods were compared to choose the best method based on reproducibility, accuracy and practicability. Screen material properties were then fed into both steady-state and validated dynamic greenhouse climate models to calculate overall screen energy saving under well-defined conditions. In the current research, different screen materials from different producers were investigated. The paper describes the methodology developed and shows data on different screen materials.",
keywords = "Air permeability, Dynamic greenhouse model, Emission, Energy saving, Greenhouse screens, Thermal infrared transmission, Water vapour permeability",
author = "S. Hemming and {Baeza Romero}, E.J. and {van Breugel}, A.J. and V. Mohammadkhani",
year = "2018",
month = "1",
day = "1",
doi = "10.17660/ActaHortic.2018.1227.27",
language = "English",
volume = "1227",
pages = "221--229",
journal = "Acta Horticulturae",
issn = "0567-7572",
publisher = "International Society for Horticultural Science",

}

A method to quantify the energy-saving performance of greenhouse screen materials. / Hemming, S.; Baeza Romero, E.J.; van Breugel, A.J. ; Mohammadkhani, V.

In: Acta Horticulturae, Vol. 1227, 01.01.2018, p. 221-229.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - A method to quantify the energy-saving performance of greenhouse screen materials

AU - Hemming, S.

AU - Baeza Romero, E.J.

AU - van Breugel, A.J.

AU - Mohammadkhani, V.

PY - 2018/1/1

Y1 - 2018/1/1

N2 - Screens used in practice are made from various material compositions (woven fabrics, knitted fabrics, foils, open or closed structures, transparent, diffuse, aluminized, various colours) and for various purposes (energy saving, reduction in light sum, or diffuse light obscuration). An important goal of the use of screens in Dutch greenhouses is to save energy. Unfortunately, to date, there is no objective method to determine the energy-saving performance of a material under standardized conditions. Energy-saving rates are estimated by manufacturers using different methods. Growers have no way of comparing material performances independently in order to make a proper investment decision. In the current research, the goal was to develop a method to quantify the energy-saving performance of greenhouse screen materials under standardized conditions. The method is based on the scientific literature and expertise of different screen producers and growers. The research focused on the three main aspects that affect energy saving of a screen: 1) thermal radiation losses, determined by the emissivity and reflectivity for thermal infrared radiation; 2) air permeability, which determines heat convection losses, characterized at a wide range of air velocities to account for velocities by buoyancy through materials as well as for velocities by forced convection caused by internal fans; and 3) water vapour permeability, which determines latent heat losses, determined under temperature, humidity and air velocity conditions normally encountered in commercial greenhouses. For all aspects, different measurement methods were compared to choose the best method based on reproducibility, accuracy and practicability. Screen material properties were then fed into both steady-state and validated dynamic greenhouse climate models to calculate overall screen energy saving under well-defined conditions. In the current research, different screen materials from different producers were investigated. The paper describes the methodology developed and shows data on different screen materials.

AB - Screens used in practice are made from various material compositions (woven fabrics, knitted fabrics, foils, open or closed structures, transparent, diffuse, aluminized, various colours) and for various purposes (energy saving, reduction in light sum, or diffuse light obscuration). An important goal of the use of screens in Dutch greenhouses is to save energy. Unfortunately, to date, there is no objective method to determine the energy-saving performance of a material under standardized conditions. Energy-saving rates are estimated by manufacturers using different methods. Growers have no way of comparing material performances independently in order to make a proper investment decision. In the current research, the goal was to develop a method to quantify the energy-saving performance of greenhouse screen materials under standardized conditions. The method is based on the scientific literature and expertise of different screen producers and growers. The research focused on the three main aspects that affect energy saving of a screen: 1) thermal radiation losses, determined by the emissivity and reflectivity for thermal infrared radiation; 2) air permeability, which determines heat convection losses, characterized at a wide range of air velocities to account for velocities by buoyancy through materials as well as for velocities by forced convection caused by internal fans; and 3) water vapour permeability, which determines latent heat losses, determined under temperature, humidity and air velocity conditions normally encountered in commercial greenhouses. For all aspects, different measurement methods were compared to choose the best method based on reproducibility, accuracy and practicability. Screen material properties were then fed into both steady-state and validated dynamic greenhouse climate models to calculate overall screen energy saving under well-defined conditions. In the current research, different screen materials from different producers were investigated. The paper describes the methodology developed and shows data on different screen materials.

KW - Air permeability

KW - Dynamic greenhouse model

KW - Emission

KW - Energy saving

KW - Greenhouse screens

KW - Thermal infrared transmission

KW - Water vapour permeability

U2 - 10.17660/ActaHortic.2018.1227.27

DO - 10.17660/ActaHortic.2018.1227.27

M3 - Article

VL - 1227

SP - 221

EP - 229

JO - Acta Horticulturae

T2 - Acta Horticulturae

JF - Acta Horticulturae

SN - 0567-7572

ER -