Energy labeling of windows – Possibilities and limitations

Trząski, Adrian; Rucińska, Joanna

doi:10.1016/j.solener.2015.07.029

Cited by 16 publications

(4 citation statements)

References 17 publications

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“…It should be considered that determining the U-value and g-value of multiple glazing systems, especially complex systems, is not an easy task. These values are not material constants and can be affected by the boundary conditions of the glazing systems [49]. As stated by Simões et al [11] and Moghaddam et al [11], three main methods may be employed to accurately determine the U-value and g-value of a glazing system: Numerical methods (or simulation tools), laboratory tests with boundary conditions close to the operational ones, and in situ tests.…”

Section: Glazing Systems' Main Propertiesmentioning

confidence: 99%

“…In general, for assessing the energy performance of windows, the most influential factors affecting the cooling and heating energy consumption of buildings have been found to be the U-value and the g-value [41,[46][47][48] and may be followed by other factors such as visible transmittance and air leakage [43,46,49]. Therefore, exact knowledge of the Uvalue and the g-value of windows (as the most influential parameters) seems essential.…”

Section: Glazing Systems' Main Propertiesmentioning

confidence: 99%

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Comprehensive Review and Analysis of Glazing Systems towards Nearly Zero-Energy Buildings: Energy Performance, Thermal Comfort, Cost-Effectiveness, and Environmental Impact Perspectives

Moghaddam,

Serra,

Gameiro da Silva

et al. 2023

Energies

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The global interest in nearly zero-energy buildings (NZEBs) has led to their establishment as mandatory building objectives in Europe for all new constructions starting in 2021. The principles outlined in the Energy Performance of Building Directive (EPBD) emphasize the significance of reducing energy demand through various energy efficiency measures to achieve NZEB status. Among these measures, the utilization of high-performance glazing systems plays a crucial role in ensuring natural light, ventilation, favorable solar gain, aesthetics, and positive psychological effects in buildings, while maintaining high energy performance and thermal comfort without burdening the budget or harming the environment. The use of increasingly larger glazing areas makes this topic of great relevance. Nevertheless, numerous studies frequently overlook certain crucial aspects of glazing systems in their assessments. This review study aims to assess different glazing solutions based on four critical perspectives called “EThCE”: Energy performance, thermal comfort, cost-effectiveness, and environmental impact, considering their interrelationships. Furthermore, the importance of adopting a comprehensive approach for selecting the optimal glazing solution for NZEBs is discussed. Additionally, the relationship between glazing systems and climate change is taken into account. Ultimately, the authors propose a comprehensive approach, including all the influential factors, to assist designers and homeowners in making informed decisions regarding glazing system selection for new NZEBs or NZEB retrofits in different situations.

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Section: Glazing Systems' Main Propertiesmentioning

confidence: 99%

Section: Glazing Systems' Main Propertiesmentioning

confidence: 99%

Comprehensive Review and Analysis of Glazing Systems towards Nearly Zero-Energy Buildings: Energy Performance, Thermal Comfort, Cost-Effectiveness, and Environmental Impact Perspectives

Moghaddam,

Serra,

Gameiro da Silva

et al. 2023

Energies

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“…Las ventanas son protagonistas en los intercambios térmicos y lumínicos entre el exterior y los espacios interiores de los edificios, y por ello impactan de manera significativa en las demandas energéticas para calefacción, refrigeración e iluminación de los mismos (Alam y Islam, 2016;Sharda y Kumar, 2016;Thalfeldt, Kurnitski y Voll, 2016;Alwetaishi, 2017;Trzaski y Rucinska, 2015). Los índices que caracterizan estos flujos energéticos a través de las ventanas son la transmitancia térmica (K, también comúnmente designada por la letra U), el factor solar (FS) y la transmitancia visible (TV).…”

Section: Introductionunclassified

Propiedades energéticas de tecnologías de ventanas en Argentina

Gastines

Pattini

2019

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RESUMENLas ventanas influyen de manera significativa en las demandas energéticas para calefacción, refrigeración e iluminación de los edificios. En este trabajo, se caracterizan las propiedades energéticas de las tecnologías de ventanas disponibles en Argentina, mediante el cálculo de sus índices K, FS y TV (transmitancia térmica, factor solar y transmitancia visible). Se analiza, además, el impacto que tienen diversos parámetros, como las dimensiones de la abertura, la tipología, el material y la absortancia solar del marco, sobre los índices mencionados. Los casos de estudio se seleccionaron cuidadosamente para asegurar una buena representatividad de la muestra analizada, utilizando, en particular, el método de análisis de conglomerados. El cálculo de los índices se realizó con el apoyo de los programas WINDOW 6.3 y THERM 6.3. Los resultados indican que los valores de K están comprendidos entre 1.88 y 6.00 W/m2K, mientras que los valores de FS varían entre 0.08 y 0.80, y los de TV entre 0.03 y 0.80, según el material del marco, la tipología y el tipo de vidriado.Palabras clave ventanas, índices, energía, desempeño, simulación. ABSTRACTWindows significantly impact the energy demand for heating, cooling and lighting in buildings. This study characterizes the energy properties of window technologies available in Argentina by calculating their thermal transmittance (U), solar heat gain coefficient (SHGC) and visible transmittance (VT). Additionally, the impact of different parameters like window opening dimensions, typology, frame material and solar absorptance on the mentioned indices is analyzed. Case studies were selected carefully using cluster analysis methods in order to ensure that the sample examined was representative. The calculation of the U, SHGC and VT indices was carried out using WINDOW 6.3 and THERM 6.3 software. The results indicate that U-values are between 1.88 and 6.00 W/m2K, while SHGC values vary between 0.08 and 0.80, and VT values are between 0.03 and 0.80, depending on frame material, typology and glazing characteristics.

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“…These efforts to increase a windows' performance by decreasing U-values and solar heat gain coefficients allow technicians today to choose from a wide range of solutions according to specific architectural projects' needs. Indeed, several systems of window labelling have been studied, so that these may be applied as an autonomous product capable of ensuring specific levels of energy performance based on heating and/or cooling needs (Trzaski & Rucinska, 2015). Nevertheless, these perspectives place the focus of thermal and energy performance merely on the development of new technologies, without considering the window size and orientation as a passive design measure.…”

Section: Introductionmentioning

confidence: 99%

A thermal performance parametric study of window type, orientation, size and shadowing effect

Amaral

Rodrigues

Gaspar

et al. 2016

Sustainable Cities and Society

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Windows are one of the elements that greatly influence the performance of buildings, both in terms of thermal comfort and energy consumption for heating or cooling. It is therefore important to find an optimal design that balances their orientation, dimension and shadowing. This paper presents a methodology for the parametric study of a window optimal dimension, based on the thermal performance of a reference room located in the climate region of Coimbra, Portugal. First, the parameters of opening type, orientation, and size are evaluated. During a second stage, the impact of using overhangs is assessed, with one of the most common window types in Portugal. The thermal assessment is carried out by calculating the degree-hours of discomfort using dynamic simulation. Results show that for this location, triple glazing has better performance than single and double glazing, especially for the north orientation. The worst opening orientation is northeast and northwest, independent of the window type. It is observable that optimum window dimension does not imply equal space cooling and heating needs. Results also demonstrate that overhangs do not significantly improve the room's thermal performance but allow windows to have a wider interval of admissible sizes without compromising performance.

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Energy labeling of windows – Possibilities and limitations

Cited by 16 publications

References 17 publications

Comprehensive Review and Analysis of Glazing Systems towards Nearly Zero-Energy Buildings: Energy Performance, Thermal Comfort, Cost-Effectiveness, and Environmental Impact Perspectives

Comprehensive Review and Analysis of Glazing Systems towards Nearly Zero-Energy Buildings: Energy Performance, Thermal Comfort, Cost-Effectiveness, and Environmental Impact Perspectives

Propiedades energéticas de tecnologías de ventanas en Argentina

A thermal performance parametric study of window type, orientation, size and shadowing effect

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