Comparing different approaches to in situ measurement of building components thermal resistance

Desogus, Giuseppe; Mura, Salvatore; Ricciu, Roberto

doi:10.1016/j.enbuild.2011.05.025

Cited by 176 publications

(124 citation statements)

References 5 publications

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“…Under the correct environmental conditions it has been proposed that evaluating R-value of buildings by direct measurement using a heat flux sensor and surface temperature sensors is more useful than using standardised R-values of the various layers of the composite system [21].…”

Section: R-value and Constant Heat Flowmentioning

confidence: 99%

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Transient and quasi-steady thermal behaviour of a building envelope due to retrofitted cavity wall and ceiling insulation

Byrne

Davies

et al. 2013

Energy and Buildings

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. (2013) 'Transient and quasi-steady thermal behaviour of a building envelope due to retrofitted cavity wall and ceiling insulation ', Energy and Buildings, 61(1), 356-365. doi;10.1016/j.enbuild.2013 Published in: Accurate understanding of the thermal behaviour of building components is essential for predicting heating or cooling needs and facilitates the implementation of more successful energy saving strategies and retrofits. This paper focuses on a specific measure commonly introduced through the residential energy efficiency retrofit programmes in Ireland-insulation. Traditionally, assessments of the performance of building envelopes have been based on assumed thermal resistances of the materials involved, laboratory tests and computer modelling. The aim of the present work is to investigate the in situ thermal behaviour of a case study building and its components under transient and quasi-steady environmental conditions, comparing data before and after the fixing of cavity wall and ceiling insulation. The paper concludes by proposing that predicted values of heat loss using standardised assumed material properties of the existing structure do not reflect the actual values achieved in situ for this test case. These values greatly overestimated the impact of the retrofitted insulation on heat loss through the ceiling and wall.

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Section: R-value and Constant Heat Flowmentioning

confidence: 99%

“…The temperature difference measured across the structure indicates the thermal resistance of the element [20]. The higher the temperature difference across the wall, the higher the accuracy of the in situ methods and a temperature difference below 10 • C is not considered sufficiently accurate [21].…”

Section: Introductionmentioning

confidence: 99%

Transient and quasi-steady thermal behaviour of a building envelope due to retrofitted cavity wall and ceiling insulation

Byrne

Davies

et al. 2013

Energy and Buildings

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“…Linear thermal bridges can be implemented through the analysis of each thermogram corresponding to an object's surface temperature [16][17][18]. Bianchi [19] said that thermographic analysis allows for the identification of thermal bridges in buildings' envelope.…”

Section: Introductionmentioning

confidence: 99%

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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“…The energy analysis of buildings through simulations is possible by means of different methodologies: some of them use simplified energy analysis tools, with a quick evaluation of the annual energy consumption, others use more detailed analysis based on dynamic algorithms [13][14][15].…”

Section: Simulations: Methodology and Description Of The Codesmentioning

confidence: 99%

Evaluation of Green Buildings’ Overall Performance through in Situ Monitoring and Simulations

et al. 2013

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Abstract:The evaluation of the overall performance of a green building is complex, since many construction, energy and environmental aspects have to be considered. The Umbria Region in Italy, through various public tenders, recently funded several residential buildings, innovative in terms of construction quality, green technologies and sustainable solutions, such as natural building materials, integrated sunspaces, PV (photovoltaic) modules and solar collectors, geothermal heat pumps, that had to be adopted to obtain the public contribution. The University of Perugia carried out an extended monitoring of these buildings, in order to verify the actual achievement of design objectives, to certify the real savings in terms of energy and environmental loads and to assess the indoor comfort conditions for occupants. In situ thermal, acoustical and lighting measurements were carried out for more than one year. Energy simulations were performed by means of codes which implement the algorithms required by the Italian Law. Moreover, a comparison between real consumptions and simulated energy requirements was carried out. Finally, the buildings were characterized from the environmental sustainability point of view, using the method adopted by the Umbria Region. This assessment was borrowed from ITACA (Institute for Innovation and Transparency in Government Procurement and Environmental Compatibility)

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Comparing different approaches to in situ measurement of building components thermal resistance

Cited by 176 publications

References 5 publications

Transient and quasi-steady thermal behaviour of a building envelope due to retrofitted cavity wall and ceiling insulation

Transient and quasi-steady thermal behaviour of a building envelope due to retrofitted cavity wall and ceiling insulation

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

Evaluation of Green Buildings’ Overall Performance through in Situ Monitoring and Simulations

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