The effect of variation in the transition hysteresis width and gradient in thermochromic glazing systems

Warwick, Michael E. A.; Ridley, Ian; Binions, Russell

doi:10.1016/j.solmat.2015.04.022

Cited by 32 publications

(24 citation statements)

References 34 publications

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“…In the non-absorbing case, as in previous work 3,7 , this modulation is assumed to occur by changes in reflectance, where the solar absorption is 0% in both high and low solar transmitting states. In the absorbing case, it is assumed that in the low temperature state 20% of incident solar radiation is absorbed whilst in the high temperature state 40% of incident solar radiation is absorbed, which is representative of optimised nanoparticle composites 12 .…”

Section: Resultsmentioning

confidence: 99%

Mitigation of hysteresis due to a pseudo-photochromic effect in thermochromic smart window coatings

Sol

Schläfer

Parkin

et al. 2018

Sci Rep

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The aim of thermochromic window coatings is to reduce the energy consumption in the built environment by passively switching between a high solar transmitting state at low temperatures and low solar transmitting state at high temperatures. Previous studies have highlighted the negative impact of phase transition hysteresis on the performance of reflection based thermochromic films. However in the literature, the best reported results have depended on vanadium dioxide nanoparticle composites and anti-reflective structures that modulate light via changes in absorption rather than reflection. In light of these factors, this work aims to demonstrate theoretically, how the effects of phase transition hysteresis and gradient differ between absorbing and non-absorbing thermochromic films. To quantify and compare the performance of films with different transition characteristics, we define a metric based on the varying net energy flux through the window over the course of a year, including thermal energy re-radiated into the building from the film. Specifically, and importantly for the field, we demonstrate that a pseudo-photochromic effect in absorbing thermochromic films mitigates the detrimental effects of phase transition hysteresis and gradient that have been reported for reflection based thermochromic films. We find that for moderate hysteresis widths of 15 °C, the performance of the non-absorbing case drops to ~60% of its initial value whilst the performance of the absorbing film only drops to ~95%. As a result we find that the absorbing case outperforms the non-absorbing case when hysteresis widths are greater than 8 °C.

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Section: Resultsmentioning

confidence: 99%

Mitigation of hysteresis due to a pseudo-photochromic effect in thermochromic smart window coatings

Sol

Schläfer

Parkin

et al. 2018

Sci Rep

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show abstract

“…Furthermore, their optical characteristics should largely change in the IR region, particularly having higher reflectance value over IR range in order to modulate solar heat gain. Finally, is the transition temperature, which is required to be close to the room temperature [18]. VO 2 has received great attention for smart window application because of its ability to control solar heat gain [19].…”

Section: Thermochromic Windowmentioning

confidence: 99%

Sol-gel approaches to thermochromic vanadium dioxide coating for smart glazing application

Seyfouri

Binions

2017

Solar Energy Materials and Solar Cells

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“…Available adaptive glazing technologies [5][6][7][8] are electrochromic (EC) [9][10][11], suspended particle device (SPD) [12][13][14][15], liquid crystal (LC) [16,17], thermochromic [18,19], thermotropic [20,21], phase change material (PCM) [22][23][24][25], gasochromic [26,27], aerogel [28,29], and vacuum [30]. These glazing are classified in two groups-…”

Section: Introductionmentioning

confidence: 99%

Effect of atmospheric transmittance on performance of adaptive SPD-vacuum switchable glazing

Ghosh¹,

Norton²,

Duffy³

2017

Solar Energy Materials and Solar Cells

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Combined suspended particle device (SPD)-vacuum glazing is a potential adaptive glazing for low energy building application. Glazing transmission is an essential parameter to determine indoor comfort level of building due to glazing. In this work, above 0.5 clearness index, a strong correlation between glazing transmission and clearness index (Atmospheric transmission) has been evaluated for south facing vertical plane glazing. Below 0.5 clearness index, isotropic diffuse transmittance was dominant and one single value of glazing transmission was found which is suitable for building energy calculation throughout the year. Below 0.5 clearness index, for south facing vertical plane SPD-vacuum glazing transmission was 17% and 1.1% for transparent and opaque states respectively.

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The effect of variation in the transition hysteresis width and gradient in thermochromic glazing systems

Cited by 32 publications

References 34 publications

Mitigation of hysteresis due to a pseudo-photochromic effect in thermochromic smart window coatings

Mitigation of hysteresis due to a pseudo-photochromic effect in thermochromic smart window coatings

Sol-gel approaches to thermochromic vanadium dioxide coating for smart glazing application

Effect of atmospheric transmittance on performance of adaptive SPD-vacuum switchable glazing

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