Optical properties of a liquid paraffin-filled double glazing unit

Li, Dong; Zheng, Yumeng; Li, Zaiwu; Hu, Qi

doi:10.1016/j.enbuild.2015.09.039

Cited by 44 publications

(14 citation statements)

References 22 publications

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“…So far, the literature has presented different experimental studies on the integration of PCM in glazing units [13,23,24,30,[32][33][34]41,43,44]. Real-scale prototypes of the technology (DGU + PCM) were used to collect data during measurements [25,26,28], and the assembly and the construction of these prototypes were carried out in house laboratories.…”

Section: Basic Technology: Integration Of the Pcm In Dgu Glazingmentioning

confidence: 99%

“…Furthermore, some results concerning laboratory characterizations [32,34,35,44] and numerical investigations [24] were published to determine the optical properties of the technologies for PCMs in solid and liquid states. The use of large integrating sphere equipment [33,35] has been necessary to obtain reliable results, due to the high scattering property of the system when the PCM is in a solid state.…”

Section: Basic Technology: Integration Of the Pcm In Dgu Glazingmentioning

confidence: 99%

“…• the geographical distribution of the studies, which also provides an indication of the climatic conditions of the study; • the climatic/seasonal distribution of the studies: winter season (37%) [12][13][14][15][16][17][18][19][20][21][22], mid-season (10%) [14,15,20] and summer (50%) [13][14][15][16][17]20,[23][24][25][26][27][28][29][30][31] season periods; • the most investigated PCM typologies, that have been found to be paraffin wax (60%) [14][15][16]18,19,22,23,[25][26][27][28][29][30][31][32][33][34][35] and salt hydrates (20%) [12,13,…”

Section: Literature Review At a Glancementioning

confidence: 99%

“…• in all the papers, the PCM had been macro-encapsulated in containers, that is, glass containers (70%) [12][13][14][15][20][21][22][23][24][25]27,[30][31][32][33][34][35][38][39][40][41], polycarbonate containers (20%) [16,17,19,28,36,42] and aluminium containers (10%) [18,26,29]; • the technologies had predominantly been characterised in outdoor test cells (57%) [14,15,17-22, 24-27,29,31,35] and through laboratory analysis (53%) [12,13,17,20,23,[32][33][34][35][36][37][38][39][40][41][42], while some other studies had been carried out by coupling a modelling activity with an experimental activity (37%) …”

Section: Literature Review At a Glancementioning

confidence: 99%

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Phase Change Materials in Transparent Building Envelopes: A Strengths, Weakness, Opportunities and Threats (SWOT) Analysis

et al. 2018

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Abstract:Building envelopes can play a crucial role in building improvement efficiency, and the adoption of Phase Change Materials (PCMs), coupled with transparent elements, may: (i) allow a better control of the heat flows from/to the outdoor environment, (ii) increase the exploitation of solar energy at a building scale and (iii) modulate light transmission in order to prevent glare effects. Starting from a literature review, focused on experimental works, this research identifies the main possible integrations of PCMs in transparent/translucent building envelope components (in glazing, in shutters and in multilayer façade system) in order to draw a global picture of the potential and limitations of these technologies. Transparent envelopes with PCMs have been classified from the simplest "zero" technology, which integrates the PCM in a double glass unit (DGU), to more complex solutions-with a different number of glass cavities (triple glazed unit TGU), different positions of the PCM layer (internal/external shutter), and in combination with other materials (TIM, aerogel, prismatic solar reflector, PCM curtain controlled by an electric pump). The results of the analysis have been summarised in a Strengths, Weakness, Opportunities and Threats (SWOT) analysis table to underline the strengths and weaknesses of transparent building envelope components with PCMs, and to indicate opportunities and threats for future research and building applications.

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Section: Basic Technology: Integration Of the Pcm In Dgu Glazingmentioning

confidence: 99%

Section: Basic Technology: Integration Of the Pcm In Dgu Glazingmentioning

confidence: 99%

Section: Literature Review At a Glancementioning

confidence: 99%

Section: Literature Review At a Glancementioning

confidence: 99%

See 2 more Smart Citations

Phase Change Materials in Transparent Building Envelopes: A Strengths, Weakness, Opportunities and Threats (SWOT) Analysis

et al. 2018

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“…With regard to the transparent components, not only 4 the thermophysical but also the optical properties of PCMs play an important role in the thermal performance of PCMfilled glazing units (D. Li et al, 2016aLi et al, , 2016b. Therefore, solar and visible properties are needed for a complete and accurate analysis of the behaviour of such components (Goia et al, , 2012bLi et al, 2015) and for a comprehensive evaluation, both thermal and visual aspects should be considered (Giovannini et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Responsive glazing systems: Characterisation methods, summer performance and implications on thermal comfort

et al. 2017

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Abstract:In recent years, there have been several experimental and numerical researches on transparent envelope components that integrate phase change materials (PCMs). To address some of the drawbacks of these systems, new prototypes were created and their summer performance was monitored under Cfa climatic conditions (Turin, Italy). The proposed glazing system comprises a triple glazing unit with a thermotropic layer placed on the outer side, acting as a switchable shading system capable of regulating the phase transition of the PCM. The PCM is tested in both the inner and the outer cavity of the glazing, alternately. In this paper, the summer performance of these responsive glazing systems is reported, complementing the assessment of their performance under winter conditions, which was previously presented in another paper (Bianco et al., 2017). Two additional systems were also tested in parallel for reference purposes: a triple glazing unit with a thermotropic layer only, and a reference triple glazing unit. Direct solar transmission was assessed, and the correlation between glazing temperature and solar transmission coefficient of the thermotropic layer, when coupled with the triple glazing unit, was derived. The solar transmission as a function of the external surface temperature of the PCM glazing units was also evaluated. The energy performance was assessed by means of a long-term evaluation in addition to daily analyses during cloudy and sunny days. The capability of the aforementioned technologies to improve indoor thermal comfort was investigated, with the effect of the transmitted solar radiation impinging on the occupants also taken into account. The results highlight that the integration of a thermotropic layer in a triple glazing unit allows the cooling load through the transparent component to be reduced by one third when compared to a traditional triple glazing unit. The overall energy performance was found to be primarily affected by the position of the PCM; not only during winter season, but especially in summer, the PCM completed the phase transition only when placed in the outermost cavity. The thermal comfort conditions were improved, when evaluated in terms of traditional PMV, regardless of the position of the PCM layer. However, when the influence of the direct solar radiation impinging on the occupants was taken into account, the solution with the PCM layer located in the inner cavity presented a better performance.

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A rapid oil concentration analytical method based on the optical properties of the oilfield re-injection water

Wang

Zhang³

et al. 2022

J Opt

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Optical properties of a liquid paraffin-filled double glazing unit

Cited by 44 publications

References 22 publications

Phase Change Materials in Transparent Building Envelopes: A Strengths, Weakness, Opportunities and Threats (SWOT) Analysis

Phase Change Materials in Transparent Building Envelopes: A Strengths, Weakness, Opportunities and Threats (SWOT) Analysis

Responsive glazing systems: Characterisation methods, summer performance and implications on thermal comfort

A rapid oil concentration analytical method based on the optical properties of the oilfield re-injection water

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