Design, Development and Thermal Performance Analysis of Ultra-Low Heat Loss Triple Vacuum Glazing

Memon, Saim

doi:10.18086/swc.2017.15.04

Cited by 13 publications

(14 citation statements)

References 16 publications

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“…However, glass sheet alone has about 92% average visible light transmittance [64,65], and a typical double air-filled [66,67,68] or vacuum glazing [69,70] has approximately between 70 % and 80% average visible light transmittance [71] and it would drop to 70% with the application of a low emissivity (low-e) coating to further reduce the radiative heat transmission. However, the low-e coatings can be avoided or replaced with transparent PV film as the initial research suggests it would not make a huge impact on the thermal transmittance values [72,73,74] since vacuum insulation would be an advantage irrespectively.…”

Section: Techniques To Establish Quantum Dotmentioning

confidence: 99%

Manifestations of carbon capture-storage and ambivalence of quantum-dot & organic solar cells: An indispensable abridged review

Memon

Nemera

Nwokeji

2020

STVE

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This study bestows an essential abridged review of the manifestations of carbon capture & storage (CCS) systems and the ambivalence of quantum-dot & organic photovoltaic (PV) solar cells. This research implicates that CCS system is evolving in capturing CO 2 emissions from coal-fired electrical power stations to further mitigate climate change. Different manifestations are discussed for capturing and storing the CO 2 with repercussions on operating costs, toxicity and energy efficiency. Chemical Looping Combustion appears to be the more energy efficient than Oxy-fuel CFBC and Ionic Liquids, and less expensive than Calcium Looping and Amine Scrubbing. Calcium Looping (Cal) and Ionic Liquids are also less toxic than Amine Scrubbing. Direct air technology is also very compelling at capturing CO 2 emissions but highly expensive. Nevertheless, further research is still required for all CCS systems to be able to implement them widely in existing/new electrical power stations. Waste heat energy recovery systems can be used in conjunction with CO 2 capture systems for further reduction of emissions. The ambivalence of quantum dot and organic solar cells are briefly reviewed. It implicates that composite film with enhanced quantum dot effects will make the film highly transparent and options of tunability of its color spectrum make the quantum dot solar cells highly attractive to a wide variety of applications. Organic solar cells are carbon-rich polymers and can be designed to improve a precise function of the cell, such as sensitivity to a certain type of light. OPV cells can only be considered as half-competent to crystalline silicon and have smaller beneficial lifespans, but could be less costly to produce in high volumes. Current research issues are substitution/compromises between electrical power conversion efficiency and average visible light transmittance. However, improving average light-transmittance decreases electrical power conversion efficiency and vice versa.

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Section: Techniques To Establish Quantum Dotmentioning

confidence: 99%

Manifestations of carbon capture-storage and ambivalence of quantum-dot & organic solar cells: An indispensable abridged review

Memon

Nemera

Nwokeji

2020

STVE

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“…The isothermal temperature distribution of the simulated TVG for the cold-side, middle, and warm-side surfaces, as shown in Figures 3-5, illustrate significant heat-transfer characteristics necessary in assessing the performance of TVG at high vacuum pressure, in which the heat flux from the warm side of the space in a building applied to the indoor glass surface, the thermal radiation between two inner glass surfaces, heat conduction via the edge seal and support pillars, and the heat flux from the outdoor (cold) surface of the glass to the outdoor ambient as per ASTM standard temperatures [35] are required. The average warm-side (indoor) and cold-side (outdoor) surface temperatures are simulated to be 19.22 • C and −9.44 • C for the total surface area, respectively, whilst being 20.14 • C and −14.13 • C for the centre-of-pane surface area, respectively.…”

Section: Thermal Performance Analysis Of 10-mm Wide Edge-sealed Tvgmentioning

confidence: 99%

“…A vacuum insulation is a cavity, not an empty space between two glass panes, as there is no concept of the absolute emptiness in high-vacuum physics, but a reduced mass of atmospheric air. The density of air in a space determines the level of vacuum pressure [35]. This provides thermal insulation, because with a lower density of air, the mean free path between air molecules is enlarged to above 1000 m, which eventually lowers the heat-transfer path between the air molecules in a space.…”

Section: Effect Of Vacuum Pressure Diminution On the Thermal Performamentioning

confidence: 99%

Effect of Cavity Vacuum Pressure Diminution on Thermal Performance of Triple Vacuum Glazing

2018

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Featured Application: Triple Vacuum glazing is regarded as a smart window technology and a robust solution of retrofitting it to existing buildings for the reduction of demand side carbon emissions and improving the energy efficiency of buildings.Abstract: Long-term durability of the vacuum edge seal plays a significant part in retrofitting triple vacuum glazing (TVG) to existing buildings in achieving progress towards a zero-energy building (ZEB) target. Vacuum pressure decrement with respect to time between panes affects the thermal efficiency of TVG. This study reports a 3D finite element model, with validated mathematical methods and comparison, for the assessment of the influence of vacuum pressure diminution on the thermal transmittance (U value) of TVG. The centre-of-pane and total U values of TVG are calculated to be 0.28 Wm −2 K −1 and 0.94 Wm −2 K −1 at the cavity vacuum pressure of 0.001 Pa. The results suggest that a rise in cavity pressure from 0.001 Pa to 100 kPa increases the centre-of-pane and total U values from 0.28 Wm −2 K −1 and 0.94 Wm −2 K −1 to 2.4 Wm −2 K −1 and 2.58 Wm −2 K −1 , respectively. The temperature descent on the surfaces of TVG between hot and cold sides increases by decreasing the cavity vacuum pressure from 50 kPa to 0.001 Pa. Nonevaporable getters will maintain the cavity vacuum pressure of 0.001 Pa for over 20 years of life span in the cavity of 10-mm wide edge-sealed triple vacuum glazing, and enable the long-term durability of TVG.Triple vacuum glazing (TVG) has the ability to curtail heat flow between the warm side and cold side of a window, i.e., to provide preeminent thermal insulation, so-called thermal transmittance (U value) [6]. TVG consists of three panes of 4 mm thick glass, with an evacuated gap 0.13 mm high, separated by 0.13 mm high and 0.3 mm diameter stainless-steel support pillars. TVG edges are sealed with airtight material such as solder glass, indium alloy, or Cerasolzer CS186. The reason TVG has the potential for retrofitting to existing buildings is because its U value is less than 0.5 Wm −2 K −1 , compared to triple air-filled glazing, which has a U value of 2.8 Wm −2 K −1 . It also would allow increasing the window-to-wall area ratios because of its U value being closer to that of cavity wall insulation. Nevertheless, TVG has associated challenges; this paper presents the findings of the effects of diminution of vacuum pressure on the U value. The U value of TVG primarily depends on the thickness of the glass panes, vacuum pressure in the space between the glass panes, emissivity of the coatings on the glass panes, frame, and type of spacers that separate the panes of glass and type of window frame. The total U value consists of the influence of the frame and the area of the edge seal. The edge seal area is dependent on the width and the type of edge-sealing material. The airtight edge seal of a TVG must be able to perpetuate a vacuum pressure below 0.1 Pa for quelling gaseous heat conduction for long-term duration [7]. Benson et al. [8] investigate...

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“…The isothermal temperature distribution of the simulated TVG for the cold-side, middle and warm-side surfaces, as shown in Fig 3-5, illustrate significant heat-transfer characteristics necessary in assessing the performance of TVG at high-vacuum pressure. In which the heat flux from the warmside of the space in a building applied to the indoor glass surface, the thermal radiation between two inner glass surfaces, heat conduction via edge-seal and support pillars, and the heat flux from the outdoor (cold) surface of the glass to the outdoor ambient as per ASTM standard temperatures [35].…”

Section: Thermal Performance Analysis Of 10 MM Wide Edge-sealed Tvgmentioning

confidence: 99%

Effect of Cavity Vacuum Pressure Diminution on Thermal Performance of Triple Vacuum Glazing

Memon¹,

Farukh²,

Kandasamy³

2018

Preprint

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Long-term durability of the vacuum edge-seal plays a significant part in retrofitting triple vacuum glazing (TVG) to existing buildings in achieving towards zero-energy buildings (ZEB) target. Vacuum pressure decrement with respect to time between panes affect the thermal efficiency of TVG. This study reports a 3D finite element model, with validated mathematical methods and comparison, for the assessment of the influence of vacuum pressure diminution on the thermal transmittance (U value) of TVG. The centre-of-pane and total U values of TVG calculated to be 0.28 Wm−2K−1 and 0.94 Wm−2K−1 at the cavity vacuum pressure of 0.001 Pa. The results suggests that a rise in cavity pressure from 0.001 Pa to 100 kPa increases the centre-of-pane and total U values from 0.28 Wm−2K−1 and 0.94 Wm−2K−1 to 2.4 Wm−2K−1 and 2.58 Wm−2K−1, respectively. The temperature descent on the surfaces of TVG between hot and cold sides’ increases by decreasing the cavity vacuum pressure from 50 kPa to 0.001 Pa. To maintain the cavity vacuum pressure of 0.001 Pa for over 20 years of life span in the cavity of 10 mm wide edge sealed triple vacuum glazing, non-evaporable getters will maintain the cavity vacuum pressure that will enable the long-term durability to TVG.

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Design, Development and Thermal Performance Analysis of Ultra-Low Heat Loss Triple Vacuum Glazing

Cited by 13 publications

References 16 publications

Manifestations of carbon capture-storage and ambivalence of quantum-dot & organic solar cells: An indispensable abridged review

Manifestations of carbon capture-storage and ambivalence of quantum-dot & organic solar cells: An indispensable abridged review

Effect of Cavity Vacuum Pressure Diminution on Thermal Performance of Triple Vacuum Glazing

Effect of Cavity Vacuum Pressure Diminution on Thermal Performance of Triple Vacuum Glazing

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