Energy saving screen materials : measurement method of radiation exchange, air permeability and humidity transport and a calculation method for energy saving

Hemming, S.; Technologie, Wur Gtb Tuinbouw; Romero, Esteban Baeza; Mohammadkhani, V.; Breugel, Bram van

doi:10.18174/409298

Cited by 7 publications

(7 citation statements)

References 4 publications

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“…The radiative heat loss in the material is dependent on emissivity and reflectivity. Higher emissivity increases the heating demand and higher reflectivity lowers the heating demand which is in agreement with the results of the previous study conducted on energy saving screen materials [7]. Figure 14a shows that the heating demand is very sensitive to screen thickness, as screen thickness increases, heating demand continuously decreases indicating the reduction in heat loss from the screen.…”

Section: Resultssupporting

confidence: 90%

“…Night thermal screens are widely used inside the greenhouses during winter season in order to save energy by reducing the heat loss to the ambient environment. While there are different kinds of thermal screens available in the market, unfortunately, farmers and researchers have very little information about the performance of the thermal screens [7].…”

Section: Introductionmentioning

confidence: 99%

“…The discussed literature showed valuable information about thermal screens, but these studies did the experimental work which was site specific and limited to the use of one specific screen. One report [7] detailed the measuring method of greenhouse screens' properties, which were further used in a KASPRO model to calculate the total energy saving of different screens. The results of this study were under specific controlled and pre-defined weather conditions.…”

Section: Introductionmentioning

confidence: 99%

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Optimization of Greenhouse Thermal Screens for Maximized Energy Conservation

Rasheed

Lee³

et al. 2019

Energies

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In this work, we proposed a Building Energy Simulation (BES) dynamic climatic model of greenhouses by utilizing Transient System Simulation (TRNSYS 18) software to study the effect of use of different thermal screen materials and control strategies of thermal screens on heat energy requirement of greenhouses. Thermal properties of the most common greenhouse thermal screens were measured and used in the BES model. Nash-Sutcliffe efficiency coefficients of 0.84 and 0.78 showed good agreement between the computed and experimental results, thus the proposed model appears to be appropriate for performing greenhouse thermal simulations. The proposed model was used to evaluate the effects of different thermal screens including; Polyester, Luxous, Tempa, and Multi-layers, as well as to evaluate control strategies of greenhouse thermal screens, subjected to Daegu city, (latitude 35.53 °N, longitude 128.36 °E) South Korea winter season weather conditions. Obtained results show that the heating requirement of greenhouses with multi-layer night thermal screens was 20%, 5.4%, and 13.5%, less than the Polyester, Luxous, and Tempa screens respectively. Thus, our experiments confirm that the use of multi-layered thermal screen can reduce greenhouse heat energy requirement. Furthermore, screen-control with outside solar radiation at an optimum setpoint of 60 W·m−2 significantly influences the greenhouse’s energy conservation capacity, as it exhibited 699.5 MJ · m−2, the least energy demand of all strategies tested. Moreover, the proposed model allows dynamic simulation of greenhouse systems and enables researchers and farmers to evaluate different screens and screen control strategies that suit their investment capabilities and local weather conditions.

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Section: Resultssupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Optimization of Greenhouse Thermal Screens for Maximized Energy Conservation

Rasheed

Lee³

et al. 2019

Energies

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“…The PRBQ yielded a transmission of 2% for the white polyester, which was closer to the output values obtained by the spectrophotometer and validated the proposed model. The radiometric properties of Luxous-1347, measured by the PRBQ, were similar to those established in earlier works (Hemming et al, 2017). Minor discrepancies due only to the placement of the measuring sensor were present.…”

Section: Resultssupporting

confidence: 84%

Measurement of longwave radiative properties of energy-saving greenhouse screens

Rafiq

Rasheed

et al. 2021

J. Agric. Eng.

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Light intensity, temperature, and humidity are key factors affecting photosynthesis, respiration, and transpiration. Among these factors, temperature is a crucial parameter to establish an optimal greenhouse climate. Temperature can be controlled by using an appropriate climate screen, which has a considerable impact on crop quantity and quality. The precise measurements of longwave radiative properties of screens are vital to the selection of the most suitable screen for greenhouses so that the desired temperature and a favorable environment can be provided to plants during nighttime. The energy-saving capability of screens can also be calculated by using these properties as inputs in a physical model. Two approaches have been reported so far in the literature for the measurement of these properties, i.e., spectrophotometry and wideband radiometry. In this study, we proposed some modified radiation balance methods for determining the total hemispherical longwave radiative properties of different screens by using wide-band radiometers. The proposed method is applicable to materials having zero porosity, partial opacity, and asymmetric screens with 100% solidity. These materials were not studied previously under natural conditions. The existing and proposed methods were applied and compared, and it was found that the radiometric values obtained from the developed methodology were similar to those previously reported in the literature, whereas the existing method gave unstable results with zero reflectance.

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“…Uitgangspunt voor het nieuwe kasconcept is een hoog isolerende maar goed lichtdoorlatende en mechanisch sterke noppenfolie welke gebruikt wordt als kasomhulling. Om de isolatie van de kas verder te verhogen wordt gebruik gemaakt van een hoog isolerend schermmateriaal volgens de uitgangspunten die eerder zijn vastgelegd door Hemming et al (2017). Om de emissie te beperken wordt gebruik gemaakt van de teelt in containers op teeltgoten.…”

Section: Aanleidingunclassified

Proof-of-principle Noppenfolie-kas voor de teelt van framboos : Ontwikkeling van kas- en teeltconcept voor energie-extensieve gewassen

Kempkes¹,

Janse²,

Raaphorst³

et al. 2020

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Energy saving screen materials : measurement method of radiation exchange, air permeability and humidity transport and a calculation method for energy saving

Cited by 7 publications

References 4 publications

Optimization of Greenhouse Thermal Screens for Maximized Energy Conservation

Optimization of Greenhouse Thermal Screens for Maximized Energy Conservation

Measurement of longwave radiative properties of energy-saving greenhouse screens

Proof-of-principle Noppenfolie-kas voor de teelt van framboos : Ontwikkeling van kas- en teeltconcept voor energie-extensieve gewassen

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