How reliable are geometry-based building indices as thermal performance indicators?

Rodrigues, Eugénio; Amaral, Ana Rita; Gaspar, Adélio Rodrigues; Gomes, Álvaro

doi:10.1016/j.enconman.2015.06.011

Cited by 30 publications

(25 citation statements)

References 27 publications

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“…These indexes, when correlated with the energy consumptions, can be useful to draw guidelines that point out the way for better building performances [9][10][11][12][13][14][15], thus helping designers to explore alternative forms and designs. In the specific case of Mediterranean climates, it is interesting to understand which are the most adequate thermal transmittance values of the buildings' elements that decrease the heating demands without excessively raising the cooling needs.…”

Section: Introductionmentioning

confidence: 99%

The impact of thermal transmittance variation on building design in the Mediterranean region

et al. 2019

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Contrarily to what happens in northern European countries, buildings in the Mediterranean region are prone to overheating. Consequently, it is important to better understand the role of thermal transmittance of the building envelope elements in the airconditioning consumptions. This paper analyzes the effect of different U-values on the building design in the Mediterranean area. 192 000 residential buildings were randomly generated and the energy consumption assessed for sixteen distinct locations. It was found that, in northern Mediterranean locations, as U-values decrease, the energy consumption also decreases. However, in warmer climates, low thermal transmittances tend to significantly increase the energy consumption. Hence, the lower the latitude, the higher the most adequate U-values, due to the increase of the cooling demands. Additionally, geometry-based indexes were correlated with the buildings energy performance. For high U-values it was found that bigger buildings worsen the energy performance and larger windows tend to improve it. For low U-values, bigger North-faced windows are beneficial. There is an adequate interval of values for which the geometry has a lower impact, which is wider and higher for lower latitudes, thus meaning that not only the building performance improves but architects are also freer to explore alternative designs.

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Section: Introductionmentioning

confidence: 99%

The impact of thermal transmittance variation on building design in the Mediterranean region

et al. 2019

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“…The analysis of these datasets allows us to better understand the building performance phenomena (Granadeiro et al, 2013;Rodrigues et al, 2015). The methodology used in the present work follows a procedure where in the first stage a reference room was created with a window placed in one of the widest exterior walls.…”

Section: Methodsmentioning

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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“…It follows that a square shape brings more advantages, and the most suitable orientation angles prove to be 0° and 80° for buildings having aspect ratios 2 and 0.5. With the exception of [10], the majority of the above mentioned studies mostly deal with the infl uence of geometric parameters for certain building types in certain climatic conditions which are usually limited solely to one country or even to only one climate region. To assess to what extent building geometry may infl uence the building energy effi ciency in different European regions, the current study analyses twelve differing models of timber-glass single-family houses located in six European cities of different geographical latitudes, longitudes and elevations.…”

Section: Miroslav Premrov -Infl Uence Of the Building Geometry On Enementioning

confidence: 99%

“…It was concluded that the impact of the shape factor was reduced with warmer climates and ceased with the average outdoor temperature ranging from 110 0 C to 140 0 C, depending on the thermal envelope properties of the buildings. Rodrigues et al [10] analysed six geometry-based building indices to determine their adequacy in eight different climate regions in Europe. The results show that geometry-based indices correlate with the buildings' thermal performance, according to specifi c climate regions and also to building design software tools.…”

Section: Miroslav Premrov -Infl Uence Of the Building Geometry On Enementioning

confidence: 99%

Influence of the building geometry on energy efficiency of timber-glass buildings for different climatic regions

Premrov¹,

Žigart²,

Zegarac-Leskovar³

2017

Istrazivanja I Projektovanja Za Privredu

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How reliable are geometry-based building indices as thermal performance indicators?

Cited by 30 publications

References 27 publications

The impact of thermal transmittance variation on building design in the Mediterranean region

The impact of thermal transmittance variation on building design in the Mediterranean region

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

Influence of the building geometry on energy efficiency of timber-glass buildings for different climatic regions

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