Experimental study of free convection in a window with a heated between-panes blind

Almeida, Felicita; Naylor, David

doi:10.1016/j.enbuild.2011.06.010

Cited by 17 publications

(6 citation statements)

References 12 publications

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“…Computational Fluid Dynamics tools have been widely used to solve the heat transfer problem and investigate the free convection in air cavities of complex glazing systems with integrated shading devices, such as horizontal Venetian blinds, pleated blinds and different configurations of fins [86][87][88][89][90]. Both hot box test [79] and laser interferometry tests [91][92][93] have been used to validate CFD models. Collins et al [87] used a two-dimensional steady laminar natural convection model to investigate the energy transfer through a window cavity containing louvers.…”

Section:  Numerical Methodsmentioning

confidence: 99%

A Review of Transparent Insulation Material (TIM) for building energy saving and daylight comfort

Sun

Wilson

2018

Applied Energy

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Improving the energy efficiency of building is key strategy in responding to climate change and resource challenges associated with the use of fossil fuel derived energy. The characteristics of the building envelope play a decisive role in determining building operation energy. Transparent Insulation Materials (TIMs) add to the strategies that may be used to sustain these improvements: they can reduce heat loss by providing high thermal resistance while effectively transmitting solar energy and contributing to the luminous environment. In this review, key types of TIMs and their characterisation in terms of both thermal and optical behaviours are introduced as well as the benefits that may be realised through their application to buildings. Relatively few studies exist regarding the performance of window systems incorporating TIMs. To provide a clear picture of how to accurately predict the performance of TIM integrated window systems, this paper also explores the literature around window systems incorporating complex interstitial structures, as these share many of the same characteristics as TIMs. The experimental and numerical methods used to evaluate the thermal and optical characteristics of complex window systems are summarised and this body of research provides potential methods for tackling similar questions posed in relation to the performance of window systems with TIMs. Finally, this review introduces a method that permits the prediction of the combined thermal and daylight behaviour of spaces served by TIM integrated window systems. The results of using this methodology show that using TIMs over a conventional window system offers a range of benefits to the occupants of buildings. Thus, this review offers a workflow that may be used to assess and analyse the benefit of applying TIMs for building energy saving and daylight comfort in buildings subjected to varying climate conditions.

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Section:  Numerical Methodsmentioning

confidence: 99%

A Review of Transparent Insulation Material (TIM) for building energy saving and daylight comfort

Sun

Wilson

2018

Applied Energy

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“…In turn, heat convection patterns in windows-shutter system are also altered by the position of the shadow. Similarly to the previously described radiative balance in shutters, for inner positioning, the solar radiation heats the shutter located inside the building once closed, incrementing shutter temperature and the heat convection inside the building (Almeida and Naylor, 2011;Avedissian and Naylor, 2008;Cuevas et al, 2010;Dalal et al, 2009;Shahid and Naylor, 2005). However, for external location heat convection variations can be considered negligible compared to heat conduction and solar radiation, especially for massive shutters.…”

Section: Fig 1 Energy Transference Processes Diagram For Windows Wimentioning

confidence: 95%

Reducing thermal energy demand in residential buildings under Spanish climatic conditions: Qualitative control strategies for massive shutter positioning

2017

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The effects of dynamic controls on external massive shutter positioning are studied as refurbishment measure to reduce energy demand in residential buildings. This kind of shading device can not only regulate solar radiation, but it also provides additional thermal insulation that reduces heat conduction when closed. Based on their capability for controlling both processes, a comparison of different qualitative shutter positioning control strategies are proposed to minimize thermal energy demand. To this aim, a simulation model based on the constructive characteristics of an experimental building has been developed with TRNSYS. The results show that when more input variables are considered greater thermal demand reduction is achieved. However, the most relevant input variables for reducing thermal demand are solar radiation and real demand of the building. A large reduction in thermal energy demand is also displayed in the comparison between massive shutters, and non-massive blinds, increasing from 23% to 35%. Surprisingly, this improvement can be achieved using simple radiation-based control strategies, whereas the inclusion of heat conduction as control variable only improves the results by 0.2%. Therefore, there is no need to increase the complexity of the shading control of the massive shutters to take advantage of their insulation properties. The thermal energy reduction is comparable to the effect of refurbishment of an ordinary double-glazed window (U=2.46 W/Km 2) with high-efficiency triple-xenon glazing (U=0.59 W/Km 2).

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“…Mokslininkų atlikti tyrimai (Cho et al 1995;Rheault, Bilgen 1989;Ullah, Lefevbre 2000) parodė, kad automatizavus langų žaliuzių reguliavimą gali būti kontroliuojami saulės pritekiai, sumažinami šildymo ir vėsinimo poreikiai pastatuose. Kiti autoriai (Dalal et al 2009;Almeida, Naylor 2011) atlikdami eksperimentinius tyrimus ir taikydami modeliavimą nagrinėjo sumontuotų tarp dviejų stiklų (stiklo pakete) žaliuzių veikimą. S. Chaiyapinunt ir N. Khamporn (2013) sudarė lango su viduje įrengtomis žaliuzėmis matematinį modelį bei atliko eksperimentinius matavimus, siekdami nustatyti šiluminį efektyvumą dėl trumpųjų bangų spinduliuotės.…”

Section: įVadasunclassified

Actual Performance Analysis of Innovative Blinds / Inovatyvių Žaliuzių Faktinio Efektyvumo Tyrimas

Šiupšinskas

Rimdžius

Džiugaitė-Tumėnienė

et al. 2016

Mokslas – Lietuvos Ateitis

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Experimental study of free convection in a window with a heated between-panes blind

Cited by 17 publications

References 12 publications

A Review of Transparent Insulation Material (TIM) for building energy saving and daylight comfort

A Review of Transparent Insulation Material (TIM) for building energy saving and daylight comfort

Reducing thermal energy demand in residential buildings under Spanish climatic conditions: Qualitative control strategies for massive shutter positioning

Actual Performance Analysis of Innovative Blinds / Inovatyvių Žaliuzių Faktinio Efektyvumo Tyrimas

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