Window frame thermal transmittance improvements without frame geometry variations: An experimentally validated CFD analysis

Lechowska, Agnieszka; Schnotale, Jacek; Baldinelli, Giorgio

doi:10.1016/j.enbuild.2017.04.002

Cited by 27 publications

(25 citation statements)

References 29 publications

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“…When it comes to thermal insulation, one of the weakest parts of the structure are windows -they can be a cause of about 35% of the heat energy demands in the building [1]. For this reason, many researches have been conducted to determine ways to increase heat insulation of windows: both their glazing [1][2][3][4][5] and the frame [7][8][9]. One of the ways to decrease heat losses through the window is to incorporate a layer of thermal insulation into the framestructure.…”

Section: Introductionmentioning

confidence: 99%

Additional Insulation Materials in a Window Frame: Experimental and CFD Analyses

Koper

Jankowska

2019

Architecture, Civil Engineering, Environment

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During our research, we tested how addition of insulating material inside a PCV window profile affects improvement of its thermal insulation. The tested insulation types were: PIR board, aerogel mat, and 3D printed additional profiles. The analysis of the heat flux passing through the window frame was carried out using the authors’ methodics, based on measurements of the temperature distribution in operating conditions and CDF simulations. The heat flux passing through the profile is calculated numerically, and the results of measurements are used to validate the accuracy of these simulations. For all the tested cases, simulations accurately reproduced the results of measurements. The heat flux drop compared to unmodified profile was about 9.8% for aerogel mat, 6.9% for PIR board, and 4.3% for 3D printed elements.

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Section: Introductionmentioning

confidence: 99%

Additional Insulation Materials in a Window Frame: Experimental and CFD Analyses

Koper

Jankowska

2019

Architecture, Civil Engineering, Environment

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“…Therefore, the literature review shows that the calibrated hot box is the most used [3,4,6,13,17,19,20,[23][24][25][26]28,30,32,33,36,37] followed by the guarded hot box [5,7,14,15,18,21,22,29,31,34,35] and the simple hot box [16,27,38]. The measuring systems always employ analog probes and the thermocouples are more widely used [3][4][5][6][13][14][15][16]18,[21][22][23][24][25][26][27]29,31,[33][34]…”

Section: Common Systems and Literature Backgroundmentioning

confidence: 99%

“…The number of probes installed that, as mentioned, depends on the size of the hot box, is very variable: some cases have less than 20 probes [13,16,19,20,27,28,38], most cases have a number of probes between 20 and 100 [4][5][6]14,15,[23][24][25]33,36], while in three cases there are more than 100 probes [34,35,37]. The measuring and control systems are mainly commercial [3,6,7,16,[19][20][21][23][24][25]27,28,31,33,37] except for one customized system [17].…”

Section: Common Systems and Literature Backgroundmentioning

confidence: 99%

“…The specimen was made up of two cross laminated timber (CLT) panels bolted together to simulate the dynamic thermal behavior of a wooden building corner (each panel had dimensions equal to 100 × 215 cm). The work of Lechowska et al [7] presented experiments in a guarded hot box for improving the PVC window frame thermal transmittance without frame geometrical dimension and material variations (the external dimensions of the window frame were 150 × 150 cm).…”

Section: Introductionmentioning

confidence: 99%

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Integrated Measuring and Control System for Thermal Analysis of Buildings Components in Hot Box Experiments

et al. 2019

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In this paper, a novel integrated measuring and control system for hot box experiments is presented. The system, based on a general-purpose microcontroller and on a wireless sensors network, is able to fully control the thermal phenomena inside the chambers, as well as the heat flux that involves the specimen wall. Thanks to the continuous measurements of air and surfaces temperatures and energy input into the hot chamber, the thermal behavior of each hot box component is analyzed. A specific algorithm allows the post-process of the measured data for evaluating the specimen wall thermal quantities and for creating 2D and 3D thermal models of each component. The system reliability is tested on a real case represented by a double insulating X-lam wall. The results of the 72 h experiment show the system’s capability to maintain stable temperature set points inside the chambers and to log the temperatures measured by the 135 probes, allowing to know both the U-value of the sample (equal to 0.216 ± 0.01 W/m2K) and the thermal models of all the hot box components. The U-value obtained via hot box method has been compared with the values gathered through theoretical calculation and heat flow meter measurements, showing differences of less than 20%. Finally, thanks to the data postprocessing, the 2D and 3D thermal models of the specimen wall and of the chambers have been recreated.

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“…Si bien existen numerosos estudios sobre las ventanas de alta performance (Granzotto et al, 2017;Jelle et al, 2012;Buratti, Moretti y Zinzi, 2017) y las estrategias para mejorar la transmitancia térmica de los marcos (Appelfeld, Hansen y Svendsen, 2010;Lechowska, Schnotale y Baldinelli, 2017;Van Den Bossche, Buffel y Janssens., 2015;Zajas y Heiselberg, 2014; N. Cardinale, Rospi y T. Cardinale, 2015), que suelen ser el principal puente térmico de las carpinterías, se encuentra poca información sobre las ventanas de baja eficiencia energética, a pesar de su uso extensivo en varias regiones del mundo, principalmente, en las economías emergentes (International Energy Agency, 2013).…”

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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Window frame thermal transmittance improvements without frame geometry variations: An experimentally validated CFD analysis

Cited by 27 publications

References 29 publications

Additional Insulation Materials in a Window Frame: Experimental and CFD Analyses

Additional Insulation Materials in a Window Frame: Experimental and CFD Analyses

Integrated Measuring and Control System for Thermal Analysis of Buildings Components in Hot Box Experiments

Propiedades energéticas de tecnologías de ventanas en Argentina

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