Annual energy window performance vs. glazing thermal emittance — the relevance of very low emittance values

Karlsson, Joakim; Roos, Arne

doi:10.1016/s0040-6090(01)01055-0

Cited by 54 publications

(19 citation statements)

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“…84 % of the solar energy is absorbed and emitted from the glass (Karlsson and Roos [43]). Low-e coatings greatly reduce the emissivity of a glass pane.…”

Section: Transparent Materials 221 Transparent Materials In Generalmentioning

confidence: 99%

“…Further improvements on this may be possible by testing other combinations of dielectrics and metals, and alter the configurations with more film layers and different thicknesses (Leftheriotis and Yianoulis [45]). However, the energy saving potential of reducing the emissivity value further may be minimal and not benefit in more than a few kWh/m 2 a year (Karlsson and Roos [43]). Considerations should therefore be made towards new combinations of materials and production methods that can produce the same emissivity but with lower production costs.…”

Section: Climate Considerationsmentioning

confidence: 99%

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Low-emissivity materials for building applications: A state-of-the-art review and future research perspectives

Jelle

Kalnæs

Gao

2015

Energy and Buildings

229

100

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Low-emissivity (low-e) materials can be used in order to reduce energy usage in both opaque and transparent areas of a building. The main focus for low-e materials is to reduce the heat transfer through thermal radiation. Furthermore, low-e materials will also influence on the daylight and total solar radiation energy throughput in windows, the latter one often characterized as the solar heat gain coefficient (SHGC). This work reviews low-e materials and products found on the market, and their possible implementations and benefits when used in buildings. The SHGC is often left out by many countries in energy labellings of windows. With opaque materials, research is still ongoing to correctly calculate the effect with regard to thermal performance when applied in buildings. Future research perspectives on where low-e technologies may develop are explored. To the authors' knowledge, there seems to be little available literature on how ageing affects low-e materials and products. As this is of large significance when calculating energy usage over the lifetime of a building, ageing effects of low-e materials should be addressed by manufacturers and the scientific community.

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“…84 % of the solar energy is absorbed and emitted from the glass (Karlsson and Roos [43]). Low-e coatings greatly reduce the emissivity of a glass pane.…”

Section: Transparent Materials 221 Transparent Materials In Generalmentioning

confidence: 99%

Section: Climate Considerationsmentioning

confidence: 99%

Low-emissivity materials for building applications: A state-of-the-art review and future research perspectives

Jelle

Kalnæs

Gao

2015

Energy and Buildings

229

100

View full text Add to dashboard Cite

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“…Reducing the thermal emittance of the glass material yields a decrease in the total solar transmitting energy. 10 Reppel and Edmonds 11 provided energysaving glazing by placing horizontal laser-cut panels inside of glazing that gives the selection of solar rays getting into the building, depending on their incident angles. Glass rotation can effectively vary the amount of heat entering the building through the window.…”

Section: Introductionmentioning

confidence: 99%

Reducing interior temperature resulting from solar energy using three-dimensional surface patterns

Lin

Hao-Hu

Chen³

et al. 2015

Advances in Mechanical Engineering

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Excessive solar energy can significantly increase interior temperatures and yield great energy demands for air conditioning. Whereas reducing energy consumptions is very crucial today, this article employs patterned glass technology which incorporates linear patterns throughout the exterior surface of glass to attenuate the solar effect on the interior thermal field based on theoretical and experimental studies. By periodically imposing linearly three-dimensional patterns over the outer surface of window glass, the analytical results indicate that the interior solar heat is able to be reduced, as the surface patterns increase the incident angle and/or decrease the solar energy loading on the patterned glass material. Moreover, the interior solar heat can be strongly affected by the pattern design. According to thermally measured results, the trapezoidal patterned glass having 3-mm-top-edged patterned members yields lower temperature on the interior surface of glass comparing with that for the trapezoidal patterns having 6-mm-top edges. Therefore, making the least non-sloped feature or flat plane appearing on the patterned glass helps decrease the interior temperature resulting from solar energy.

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“…In a cold climate, it is desired that the glazing has a low emittance and a high g-value and visual transmittance (VT). In warm climates, there is a high possibility that the buildings' thermal properties are less important and a low g-value is desired [3].…”

Section: Energy Flow Through Windowsmentioning

confidence: 99%

Different Aspects of Windows in Buildings

Obrecht¹,

Leskovar²,

Premrov³

et al. 2017

WIT Transactions on Ecology and the Environment

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Windows are an important part of the building envelope. They are important for the energy performance of a building, since they enable passive solar gains, reduce the need for artificial lighting and enable natural ventilation. Passive design strategies are important to enhance the performance of buildings without active systems. The passive solar gains of buildings depend on the orientation of the glazing, the glazing type, the micro location and the form of the building. A study of a single family house with different deviations from the main glazing façade, that differ from the main cardinal orientation, is presented. For each case, the optimal glazing point and the optimal glazing area were examined. A southern orientation remains the most optimal for the chosen climate of Ljubljana. Buildings create an artificial environment with restricted access to daylight. To compensate natural light, artificial lighting sources are installed in the building. To illustrate the influence of windows on the energy performance in an office, the needs for artificial lighting were observed. The energy demand caused by the electricity consumption of artificial lighting is substantial, so the positioning of windows and the visual transmittance are of great importance. Beside the size of the window, its form and height plays an important role. Windows also affect the well-being of the occupants. Most of these effects are connected with providing light, natural ventilation and communication with the outside world. These aspects are also present in sustainable building certification schemes. An overview of the health-related topics presented in different certification schemes connected to windows has been made. We have compared different certification schemes in how they deal with issues of light.

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Annual energy window performance vs. glazing thermal emittance — the relevance of very low emittance values

Cited by 54 publications

References 1 publication

Low-emissivity materials for building applications: A state-of-the-art review and future research perspectives

Low-emissivity materials for building applications: A state-of-the-art review and future research perspectives

Reducing interior temperature resulting from solar energy using three-dimensional surface patterns

Different Aspects of Windows in Buildings

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