QUB/e: A Novel Transient Experimental Method for in situ Measurements of the Thermal Performance of Building Fabrics

Meulemans, Johann; Alzetto, Florent; Farmer, David; Gorse, Christopher

doi:10.1007/978-3-319-50346-2_9

Cited by 15 publications

(35 citation statements)

References 5 publications

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“…• on a house constructed inside an environmentally controlled chamber at University of Salford (Meulemans, Alzetto, Farmer, & Gorse, 2017;Alzetto, Pandraud, Fitton, & Heusler, 2018;Alzetto, Farmer, Fitton, Huges, & Swan, 2018); • on one of the twin houses of Fraunhofer Institute for Building Physics (Alzetto, Pandraud, Fitton, & Heusler, 2018); • on a house of 280 m 2 in southern France (Mangematin, Pandraud, & Roux, 2012); • on an apartment in a high-raise building in Stockholm (Meulemans J. , 2018).…”

Section: /26mentioning

confidence: 99%

Design of experiments for Quick U-building method for building energy performance measurement

Ghiaus

Alzetto

2019

Journal of Building Performance Simulation

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Quick U-building (QUB) is a method for short time measurement of energy performance of buildings, typically one night. It uses the indoor air temperature response to power delivered to the indoor air by electric heaters. This paper introduces a method for estimating the expected measurement error as a function of the amplitude and the time duration of the input signal based on the decomposition of the time response of a state-space model into a sum of exponentials by using the eigenvalues of the state matrix. It is shown that the buildings have a group of dominant time constants, which gives an exponential response, and many very short and very large time constants, which have a small influence on the response. The analysis of the eigenvalues demonstrates that the QUB experiment may be done in a rather short time as compared with the largest time constant of the building.

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Section: /26mentioning

confidence: 99%

Design of experiments for Quick U-building method for building energy performance measurement

Ghiaus

Alzetto

2019

Journal of Building Performance Simulation

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“…Bienvenido-Huertas et al recently published a comprehensive review [2] summarizing most of these methods. For the sake of completeness, let us add the QUB/e method [3] [4] to this review. However, these methods are not mature enough to be widely used by the community.…”

Section: Introductionmentioning

confidence: 99%

Novel in situ measurement methods of the total heat transfer coefficient on building walls

François

Ibos

Feuillet

et al. 2020

Energy and Buildings

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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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“…The outliers in Figure 4a coincided with extremely small power ratios (alpha value in Equation 4). Alpha value should be in the range of 0.4-0.7 [14]. The day 18 of the QUB experiment shows a positive slope during the cooling phase, meaning that temperature increased instead of decreasing.…”

Section: Data Used For Qub Numerical Experimentsmentioning

confidence: 98%

“…where: -measured power before the start of the QUB experiment used to achieve the steady state conditions; -measured power during the heating phase of the QUB experiment. This quantity is used to determine the optimum power for QUB heating phase: the heating power should be selected such that alpha remains between 0.4 and 0.7 [14].…”

Section: Introductionmentioning

confidence: 99%

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Influence of Initial and Boundary Conditions on the Accuracy of the QUB Method to Determine the Overall Heat Loss Coefficient of a Building

2020

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The quick U-building (QUB) method is used to measure the overall heat loss coefficient of buildings during one to two nights by applying heating power and by measuring the indoor and the outdoor temperatures. In this paper, the numerical model of a real house, previously validated on experimental data, is used to conduct several numerical QUB experiments. The results show that, to some extent, the accuracy of QUB method depends on the boundary conditions (solar radiation), initial conditions (initial power and temperature distribution in the walls) and on the design of QUB experiment (heating power and duration). QUB method shows robustness to variation in the value of the overall heat loss coefficient for which the experiment was designed and in the variation of optimum power for the QUB experiments. The variations in the QUB method results are smaller on cloudy than on sunny days, the error being reduced from about 10% to about 7%. A correction is proposed for the solar radiation absorbed by the wall that contributes to the evolution of air temperature during the heating phase.

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QUB/e: A Novel Transient Experimental Method for in situ Measurements of the Thermal Performance of Building Fabrics

Abstract: ABSTRACT

Cited by 15 publications

References 5 publications

Design of experiments for Quick U-building method for building energy performance measurement

Design of experiments for Quick U-building method for building energy performance measurement

Novel in situ measurement methods of the total heat transfer coefficient on building walls

Influence of Initial and Boundary Conditions on the Accuracy of the QUB Method to Determine the Overall Heat Loss Coefficient of a Building

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