A building thermal bridges sensitivity analysis

Capozzoli, Alfonso; Gorrino, Alice; Corrado, Vincenzo

doi:10.1016/j.apenergy.2013.02.045

Cited by 107 publications

(56 citation statements)

References 16 publications

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“…Sustainability 2015, 7,[16687][16688][16689][16690][16691][16692][16693][16694][16695][16696][16697][16698][16699][16700][16701][16702] Equation (8) is valid for all internal cells (an internal cell has at least one cell on each side). For boundary cells, Equation 8 was modified in the following way.…”

Section: Numerical Simulationmentioning

confidence: 99%

“…Most studies present empirical relationships of linear thermal bridges, from which the thermal transmittance ψ value of certain construction elements can be determined [7,20]. Based on these values, numerical calculation software is created and catalogues are prepared.…”

Section: Introductionmentioning

confidence: 99%

“…Ascione [4] learned that thermal bridges can increase the heating demand of buildings by over 20%. This influence depends on weather conditions [5], level of insulation [6], the thermal bridges' construction [7][8][9], the type of building (use and geometry), and the method used to implement its effect within the calculation of the building energy demand [4]. Approaches of thermal bridges in regulation are different in the EPBD context [10].…”

Section: Introductionmentioning

confidence: 99%

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A Simplified Methodology for Evaluating the Impact of Point Thermal Bridges on the High-Energy Performance of a Passive House

et al. 2015

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Abstract:In the design of high-energy performance buildings with ventilated facade systems, the evaluation of point thermal bridges is complicated and is often ignored in practice. This paper analyzes the relationship between the point thermal bridges resulting from aluminum fasteners, which are used for installation facades cladding, and the thermal properties of materials that are used in external walls layers and dimension of layers. Research has shown that the influence of the point thermal bridges on the U-value of the entire wall may achieve an average of up to 30% regarding thermal properties of materials of the external wall layers and the dimension of layers. With the increase in thermal conductivity of the bearing layer material and the thickness of the thermal insulation layer, the point thermal transmittance χ-value increased. For this reason, the U-value of the entire wall may increase by up to 35%. With the increase of the thickness of the bearing layer and thermal conductivity value of thermal insulation layer, the point thermal transmittance χ-value decreased by up to 28%. A simplified methodology is presented for the evaluation of point thermal bridges based on the thermal and geometrical properties of external wall layers.

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Section: Numerical Simulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Simplified Methodology for Evaluating the Impact of Point Thermal Bridges on the High-Energy Performance of a Passive House

et al. 2015

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“…Such expressions for some thermal bridges are for example proposed by [5,6]. Nevertheless, in these studies, the expression for linear thermal transmittance of thermal bridges was assumed to be of the form [5,6] show stochastic features, although no stochastic nature is expected. Therefore, in this paper, a semi-empirical expression for a linear thermal transmittance of a simple balcony thermal bridge will be proposed without any assumption on the form.…”

Section: Introductionmentioning

confidence: 99%

“…Another method would be to use semi-empirical expressions, similar to those used in treatment of heat losses through ground, defined in [4]. Such expressions for some thermal bridges are for example proposed by [5,6]. Nevertheless, in these studies, the expression for linear thermal transmittance of thermal bridges was assumed to be of the form [5,6] show stochastic features, although no stochastic nature is expected.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Linear Thermal Transmittance of a Simple Balcony Thermal Bridge

Brdnik¹

2017

STEPGRAD

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Fakluteta za matematiko in fiziko, Univerza v LjubljaniApstrakt: U ovom radu je analiziran linijski koeficijent prolaza toplote jednostavnog toplotnog mosta koji se javlja na spoju uniformne balkonske ploče i zida. Model zavisi od pet parametara: debljina, dužina i toplotna provodljivost balkonske ploče; debljina i toplotna provodljivost zida. Rezultati istraživanja ukazuju da dužina balkonske ploče ne utiče na linijski koeficijent prolaza toplote, dok je zavisnost od druga dva parametra ploče linearnog tipa. S druge strane, zavisnost od parametara zida je komplikovanijeg oblika, a odgovarajući izrazi koji opisuju ovu zavisnost su uspješno izvedeni. Ovo istraživanje predstavlja prvi korak u pronalaženju semi-empirijske jednačine, koja bi mogla uspješno opisati linijski koeficijent prolaza toplote toplotnog mosta koji se javlja na spoju betonske ploče i homogenog višeslojnog zida. Ključne riječi: prenos toplote, toplotni most, balkon, numerička simulacija ANALYSIS OF LINEAR THERMAL TRANSMITTANCE OF A SIMPLE BALCONY THERMAL BRIDGE Abstract:The linear thermal transmittance of a simple balcony thermal bridge with a uniform balcony slab and wall was analysed. In a five-parameter model (thickness, length and thermal conductivity of a balcony slab; thickness and thermal conductivity of an adjacent wall), it was found that the length of the balcony slab does not influence the thermal transmittance, while its dependence on the other two slab parameters is linear. The influence of wall parameters on the linear transmittance proved to be more complicated, but appropriate expressions were successfully found. The study presents the first step in the search of a semi-empirical formula that can successfully describe the linear transmittance of a balcony thermal bridge with a homogeneous multi-layer wall.

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The Effect of Thermal Bridge Junctions Between Pillars and Walls in the Energy Demand of Buildings in Warm Climate

Bienvenido-Huertas

Montes

Rubio-Bellido

et al. 2020

Critical Thinking in the Sustainable Rehabilitation and Risk Management of the Built Environment

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Currently, the building stock is energy inefficient. Consequently, the residential sector is one of the main sources emitting Greenhouse Gases, mainly due to the poor thermal performance of envelopes. Thermal bridges are among those envelope elements where heat losses or gains take place. A previous study highlighted the importance of controlling the linear thermal transmittance in junctions, such as slab fronts. However, there is a lack of studies analysing the thermal bridges of pillars and their effect on the energy demand of buildings located in warm climate zones. This study therefore analyses how the linear thermal transmittance of pillars affects the building energy demand. For this purpose, a case study located in Seville was analysed in 3 different climatic scenarios (current, 2050, and 2100). The case study was simulated with 3 different designs of junctions between pillars and walls. The linear thermal transmittance was determined using a two-dimensional simulation, and the energy demand was determined using EnergyPlus. The results of this study confirm the importance of controlling the thermal bridges of pillars and their impact on the energy demand.

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A building thermal bridges sensitivity analysis

Cited by 107 publications

References 16 publications

A Simplified Methodology for Evaluating the Impact of Point Thermal Bridges on the High-Energy Performance of a Passive House

A Simplified Methodology for Evaluating the Impact of Point Thermal Bridges on the High-Energy Performance of a Passive House

Analysis of Linear Thermal Transmittance of a Simple Balcony Thermal Bridge

The Effect of Thermal Bridge Junctions Between Pillars and Walls in the Energy Demand of Buildings in Warm Climate

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