Phase separated thermotropic layers based on UV cured acrylate resins – Effect of material formulation on overheating protection properties and application in a solar collector

Resch, Katharina; Wallner, Gernot M.; Hausner, Robert

doi:10.1016/j.solener.2009.06.006

Cited by 24 publications

(30 citation statements)

References 11 publications

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“…The material was 0.8 mm thick and contained 5% weight concentration of particles. The best performing samples, based on a change in transmittance with temperature, had solar-weighted transmittances of 87% and 83% in the clear state, and 75% and 69%, respectively, in the translucent state [18]. In a study of 36 unspecified material combinations, the two combinations with the most significant change in solar-weighted transmittance changed from 80% and 77% in the clear state to 68% and 64%, respectively, in the translucent state [20].…”

Section: Introductionmentioning

confidence: 99%

“…The focus of efforts to develop thermotropic materials for solar collectors is phase change thermotropic materials [14,[18][19][20]. As illustrated in Fig.…”

Section: Introductionmentioning

confidence: 99%

“…To date, numerous phase change thermotropic materials have been evaluated [17][18][19][20][23][24][25][26][27][28][29][30], but none meets the dual requirements of high transmittance in the clear state and high reflectance in the translucent state. Muehling et al [25] used a mixture of noctadecane/n-eicosane/n-docosane/n-tetracosane as the scattering domain in an acrylate-based ultraviolet (UV) curable resin, at a 6% weight concentration of particles and a sample thickness of 1.7 mm.…”

Section: Introductionmentioning

confidence: 99%

“…The two samples with the most significant change in solar-weighted transmittance changed from 75% and 69% in the clear state to 54% and 41%, respectively, in the translucent state [25]. Resch et al [18] utilized a wax for the scattering domain and a UV-cured resin for the matrix. The material was 0.8 mm thick and contained 5% weight concentration of particles.…”

Section: Introductionmentioning

confidence: 99%

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A Parametric Numerical Study of Optical Behavior of Thermotropic Materials for Solar Thermal Collectors

Gladen

Mantell

Davidson

2014

Journal of Heat Transfer

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A Monte Carlo model is applied to determinate the steady state, solar-weighted optical properties of potential thermotrvpic composite materials for overheat protection of polymer solar absorbers. The key results are dimensionless plots of normal-hemispherical transmittance, reflectance and absorptance as a function of particle size parameter, scattering albedo, and over-all optical thickness. The optical behavior of thermotropic materials at different temperatwes is represented by a change in the relative refractive index which affects the scattering albedo and optical thickness. At low temperatures where overheat protection is not requir'ed, referr'ed to as the clear state, the over-all optical thickness should be less than 0.3 to ensure high transmittance for the preferred particle size parameter of 2. At higher temperatures where overheat protection is requir-ed, referred to as the translucent state, the overall optical thickness should be greater than 10 and the scattering albedo should be greater than 0.995 to achieve 50% reflectance. A case study of low molecular weighted polyethylene in poly(methyl methacrylate) is presented to illustr-ate use of the r-esults to guide the design of thermotropic materials.

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Section: Introductionmentioning

confidence: 99%

“…The focus of efforts to develop thermotropic materials for solar collectors is phase change thermotropic materials [14,[18][19][20]. As illustrated in Fig.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Parametric Numerical Study of Optical Behavior of Thermotropic Materials for Solar Thermal Collectors

Gladen

Mantell

Davidson

2014

Journal of Heat Transfer

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“…Recent studies regarding TSFD revealed a limited overheating protection performance of the layers due to an inappropriate scattering domain size and/or shape [17,19,26,28,30]. In a preceding study, potential remedies in order to adjust the scattering domain shape and size were outlined [30].…”

Section: Introductionmentioning

confidence: 99%

Thermotropic overheating protection glazings: effect of functional additives and processing conditions on the overheating protection performance

Weber

Resch

2014

Journal of Polymer Engineering

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Within this study, the effect of functional additives and processing conditions on the overheating protection performance of thermotropic systems with fixed domains (TSFD) for overheating protection purposes was evaluated. The focus was on improving the overheating protection performance of a prototype TSFD based on a UV curable acrylate resin by optimization of the material constitution (addition of functional additives like surfactants and nucleating agents) and the processing conditions (temperature conditions during manufacturing, annealing). For the evaluated system, an effect of the nucleating agent on the overheating protection performance was ascertained. Furthermore, omission of an annealing step improved the overheating protection performance slightly.

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Polymer Durability for Solar Thermal Applications

Mantell

Davidson

2012

Polymeric Materials for Solar Thermal Applications

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Phase separated thermotropic layers based on UV cured acrylate resins – Effect of material formulation on overheating protection properties and application in a solar collector

Cited by 24 publications

References 11 publications

A Parametric Numerical Study of Optical Behavior of Thermotropic Materials for Solar Thermal Collectors

A Parametric Numerical Study of Optical Behavior of Thermotropic Materials for Solar Thermal Collectors

Thermotropic overheating protection glazings: effect of functional additives and processing conditions on the overheating protection performance

Polymer Durability for Solar Thermal Applications

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