The impact of increasing the building envelope insulation upon the risk of overheating in summer and an increased energy consumption

Chvatal, Karin Maria Soares; Corvacho, Helena

doi:10.1080/19401490903095865

Cited by 71 publications

(39 citation statements)

References 4 publications

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“…Furthermore, if an extra insulation can bring some advantages in terms of thermal comfort in winter, this is not assured in summer for Mediterranean climate. A computer simulation study carried out on the influence of increasing thermal insulation on summer thermal comfort [17] showed there is a turning point where, depending on thermal inertia, ventilation and heat gains, an increase in thermal insulation leads to an increase of the number of hours of discomfort in summer. In the left side of Figure 19, an example of the variation of the percentage of hours of discomfort in summer, for a location in Portugal, in function of the level of insulation of the envelope is given for different values of the shading factor.…”

Section: Discussionmentioning

confidence: 99%

A Reflection on Low Energy Renovation of Residential Complexes in Southern Europe

2016

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Abstract:The transformation of European existing building stock towards very low energy buildings requires a new approach. In this context, it seems reasonable to think that buildings should no longer be renovated individually but as part of a global energy system. Focusing on larger urban units may present some scale advantages and may constitute an opportunity to change the urban environment in a smart energy way. Specificities of Southern European countries are addressed. Due either to the climate or the life style, there are large differences in energy consumption per dwelling among southern and northern European countries. How much heating energy will be saved by over-insulating building envelopes if people do not feel the need to heat their houses in the first place? In addition, real energy use in buildings frequently shows major differences with respect to the predicted consumption. The definition of realistic solutions demands the availability of realistic predictions. A case of a residential complex in Portugal is used to illustrate the main questions and to conclude that moving from a building to a group of buildings scale may be an interesting challenge for policy makers to look closer in the near future.

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Section: Discussionmentioning

confidence: 99%

A Reflection on Low Energy Renovation of Residential Complexes in Southern Europe

2016

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“…The SM RTQ-C takes into account the building geometry (projection area, total floor area, envelope area and total volume area) and some parameters related to openings, such as WWR (window-to-wall ratio), FS (solar factor), AVS (horizontal shadings), AHS (vertical shading). The acronyms of WWR, FS, AVS and AHS are the same as considered in the RTQ-C. Wall and roof thermal transmittance were not included in the SM RTQ-C , in spite of its recognized importance in the thermal performance of the building envelope [28]. Thermal transmittance was not included because its effect on the building energy performance is not linear [29], and consequently the multi-linear regression did not provide satisfactory coefficient of determination when transmittance is taken into account.…”

Section: Overview Of the Simplified Model For Calculation Of Energy Pmentioning

confidence: 99%

Assessing the accuracy of a simplified building energy simulation model using BESTEST: The case study of Brazilian regulation

Melo

Cóstola

Lamberts

et al. 2012

Energy and Buildings

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• A submitted manuscript is the version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publication General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal.If the publication is distributed under the terms of Article 25fa of the Dutch Copyright Act, indicated by the "Taverne" license above, please follow below link for the End User Agreement: Moreover, in all four building typologies analysed, the simplified model led to a lower energy efficiency 22 label when compared to the label obtained using BES. The paper concludes that the simplified model may 23 require improvements to properly indicate the actual energy performance of commercial building 24 envelopes. 25 26

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“…Global and local building policies set stringent energy goals for new and existing buildings with the aim of reaching near zero energy and carbon emissions. However, concerns exist about the comfort-related risks arising from lowenergy, highly insulated buildings in a changing climate (Chvatal and Corvacho 2009;McLeod, Hopfe, and Kwan 2013;Sameni et al 2015).…”

Section: Introductionmentioning

confidence: 99%

A stepwise approach for assessing the appropriate occupant behaviour modelling in building performance simulation

Gaetani

Hoes

Hensen

2020

Journal of Building Performance Simulation

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Occupant behaviour (OB) is recognized as a leading source of uncertainty in building performance predictions. Neglecting the potential influence of uncertainties on building performance could result in erroneous decision-making during the design phase. Therefore, it is essential that uncertainties are appropriately considered within building performance simulation (BPS) models. As for OB, there are various approaches to model occupant presence and actions in BPS tools. Literature shows that the appropriate modelling approach depends on the object and purpose of the simulation, which makes it difficult to favour a method over another a priori. Moreover, there is very little support for selecting the most appropriate modelling approach. As a result, OB is modelled in practice in various ways, mostly dictated by intuition and habit. This study builds on previous literature to introduce and test a complete approach for appropriate OB modelling. The method can be generalized and readily applied to design questions.

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The impact of increasing the building envelope insulation upon the risk of overheating in summer and an increased energy consumption

Cited by 71 publications

References 4 publications

A Reflection on Low Energy Renovation of Residential Complexes in Southern Europe

A Reflection on Low Energy Renovation of Residential Complexes in Southern Europe

Assessing the accuracy of a simplified building energy simulation model using BESTEST: The case study of Brazilian regulation

A stepwise approach for assessing the appropriate occupant behaviour modelling in building performance simulation

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