Studying the impacts of test condition and nonoptimal positioning of the sensors on the accuracy of the in-situ U-value measurement
The non-destructive thermal characterization of building envelopes relies significantly on various factors such as climate conditions, monitoring devices used, indoor environment, and conditioning systems. In the case of both the temperature-based method (TBM) and heat flux meter (HFM) approaches, U...
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| Format: | Article |
| Language: | English |
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Elsevier
2023-07-01
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| Series: | Heliyon |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2405844023044900 |
| _version_ | 1827892340343177216 |
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| author | Behnam Mobaraki Francisco Javier Castilla Pascual Arturo Martínez García Miguel Ángel Mellado Mascaraque Borja Frutos Vázquez Carmen Alonso |
| author_facet | Behnam Mobaraki Francisco Javier Castilla Pascual Arturo Martínez García Miguel Ángel Mellado Mascaraque Borja Frutos Vázquez Carmen Alonso |
| author_sort | Behnam Mobaraki |
| collection | DOAJ |
| description | The non-destructive thermal characterization of building envelopes relies significantly on various factors such as climate conditions, monitoring devices used, indoor environment, and conditioning systems. In the case of both the temperature-based method (TBM) and heat flux meter (HFM) approaches, U-value is determined considering the ideal condition of steady state. However, it is challenging to accurately define the true thermal condition of buildings when monitoring is affected by inherent uncertainties of the chosen approach and inadequate instrumentation of building envelopes. This paper presents the outcomes of an experimental campaign, that aimed to evaluate the impact of incorrectly positioned exterior sensors, on the precision of U-value measurements. This study simultaneously employed the TBM and HFM approaches. To enhance the accuracy of the results, rigorous outlier detection and statistical analysis were employed on the data collected from three autonomous monitoring systems. The findings of this study revealed that the applied data analysis yielded more satisfactory results for the TBM approach compared to HFM. However, regardless of the approach used, the effectiveness of outlier detection relied heavily on the accuracy of the monitoring systems. When removing an individual outlier, the monitoring systems characterized with higher accuracies provided U-values that were closer to the theoretical values, than less accurate ones. |
| first_indexed | 2024-03-12T21:39:23Z |
| format | Article |
| id | doaj.art-51837e22a851446191c95aabd95da857 |
| institution | Directory Open Access Journal |
| issn | 2405-8440 |
| language | English |
| last_indexed | 2024-03-12T21:39:23Z |
| publishDate | 2023-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Heliyon |
| spelling | doaj.art-51837e22a851446191c95aabd95da8572023-07-27T05:56:22ZengElsevierHeliyon2405-84402023-07-0197e17282Studying the impacts of test condition and nonoptimal positioning of the sensors on the accuracy of the in-situ U-value measurementBehnam Mobaraki0Francisco Javier Castilla Pascual1Arturo Martínez García2Miguel Ángel Mellado Mascaraque3Borja Frutos Vázquez4Carmen Alonso5Department of Civil and Building Engineering, Universidad de Castilla-La Mancha (UCLM), Av. Camilo Jose Cela s/n, 13071, Ciudad Real, Spain; Corresponding author.Department of Applied Mechanics and Project Engineering, Universidad de Castilla-La Mancha (UCLM), Escuela Técnica Superior de Ingenieros Industriales, 02071, Albacete, SpainInstituto de Ciencias de la Construcción Eduardo Torroja. Consejo Superior de Investigaciones Científicas (IETcc-CSIC), Serrano Galvache 4, 28033, Madrid, Spain; Departamento de Construcción y Tecnología Arquitectónicas. Universidad Politécnica de Madrid (UPM), Escuela Técnica Superior de Arquitectura de Madrid, 28040. Av. Juan de Herrera 4, Madrid, SpainDepartment of Civil and Building Engineering, Universidad de Castilla-La Mancha (UCLM), Escuela Politécnica de Cuenca, Campus Universitario, 16071, Cuenca, SpainInstituto de Ciencias de la Construcción Eduardo Torroja. Consejo Superior de Investigaciones Científicas (IETcc-CSIC), Serrano Galvache 4, 28033, Madrid, SpainInstituto de Ciencias de la Construcción Eduardo Torroja. Consejo Superior de Investigaciones Científicas (IETcc-CSIC), Serrano Galvache 4, 28033, Madrid, SpainThe non-destructive thermal characterization of building envelopes relies significantly on various factors such as climate conditions, monitoring devices used, indoor environment, and conditioning systems. In the case of both the temperature-based method (TBM) and heat flux meter (HFM) approaches, U-value is determined considering the ideal condition of steady state. However, it is challenging to accurately define the true thermal condition of buildings when monitoring is affected by inherent uncertainties of the chosen approach and inadequate instrumentation of building envelopes. This paper presents the outcomes of an experimental campaign, that aimed to evaluate the impact of incorrectly positioned exterior sensors, on the precision of U-value measurements. This study simultaneously employed the TBM and HFM approaches. To enhance the accuracy of the results, rigorous outlier detection and statistical analysis were employed on the data collected from three autonomous monitoring systems. The findings of this study revealed that the applied data analysis yielded more satisfactory results for the TBM approach compared to HFM. However, regardless of the approach used, the effectiveness of outlier detection relied heavily on the accuracy of the monitoring systems. When removing an individual outlier, the monitoring systems characterized with higher accuracies provided U-values that were closer to the theoretical values, than less accurate ones.http://www.sciencedirect.com/science/article/pii/S2405844023044900Thermal transmittance parameterTemperature-based methodHeat flux meter methodBuilding thermal monitoringEnergy efficiencyHEAT |
| spellingShingle | Behnam Mobaraki Francisco Javier Castilla Pascual Arturo Martínez García Miguel Ángel Mellado Mascaraque Borja Frutos Vázquez Carmen Alonso Studying the impacts of test condition and nonoptimal positioning of the sensors on the accuracy of the in-situ U-value measurement Heliyon Thermal transmittance parameter Temperature-based method Heat flux meter method Building thermal monitoring Energy efficiency HEAT |
| title | Studying the impacts of test condition and nonoptimal positioning of the sensors on the accuracy of the in-situ U-value measurement |
| title_full | Studying the impacts of test condition and nonoptimal positioning of the sensors on the accuracy of the in-situ U-value measurement |
| title_fullStr | Studying the impacts of test condition and nonoptimal positioning of the sensors on the accuracy of the in-situ U-value measurement |
| title_full_unstemmed | Studying the impacts of test condition and nonoptimal positioning of the sensors on the accuracy of the in-situ U-value measurement |
| title_short | Studying the impacts of test condition and nonoptimal positioning of the sensors on the accuracy of the in-situ U-value measurement |
| title_sort | studying the impacts of test condition and nonoptimal positioning of the sensors on the accuracy of the in situ u value measurement |
| topic | Thermal transmittance parameter Temperature-based method Heat flux meter method Building thermal monitoring Energy efficiency HEAT |
| url | http://www.sciencedirect.com/science/article/pii/S2405844023044900 |
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