Studying the impacts of test condition and nonoptimal positioning of the sensors on the accuracy of the in-situ U-value measurement

Mobaraki, Behnam; Pascual, Francisco Javier Castilla; Martínez, Arturo; Mascaraque, Miguel Ángel Mellado; Vázquez, Borja Frutos; Alonso, Carmen

doi:10.1016/j.heliyon.2023.e17282

Cited by 18 publications

(12 citation statements)

References 55 publications

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“…Likewise, Mahdaoui et al [15] explored the application of a hollow building brick with microencapsulated PCM, achieving a 2 • C reduction in daily thermal amplitude. Similar positive outcomes were observed in the studies of gypsum boards modified with microencapsulated PCM [18] and a Trombe wall system enhanced with macroencapsulated PCM [20,21].…”

Section: Introductionsupporting

confidence: 80%

Application of Novel Phase Change Material Constructive Solution for Thermal Regulation of Passive Solar Buildings

Figueiredo,

Silva,

Gonçalves

et al. 2024

Buildings

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A comprehensive investigation regarding the hygrothermal behavior of a constructive solution containing phase change materials (PCMs) was performed on a full-scale test cell, divided into two similar compartments. This involved hygrothermal monitoring (indoor air temperature) of the two compartments, in which one had PCM incorporated into the floor mortar. The main goal of this research was to investigate the potential of this kind of solution for overheating mitigation. The numerical study was conducted using EnergyPlus® software (version 9.0), exploring different natural ventilation flow rates to gauge the novel solution’s potential to reduce overheating rates. The results from the monitoring studies revealed prolonged periods of thermal discomfort in both test cells, particularly overheating. However, it was proven that the PCM application in one of the test cells led to a reduction of almost 10 °C in the maximum peak of air temperature. In the simulation analysis, the increase in the ventilation rate led to a linear decrease in the overheating hours of up to one renovation per hour, and then the reductions were attenuated.

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Section: Introductionsupporting

confidence: 80%

Application of Novel Phase Change Material Constructive Solution for Thermal Regulation of Passive Solar Buildings

Figueiredo,

Silva,

Gonçalves

et al. 2024

Buildings

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“…Structural health monitoring is not limited to bridges. In the field of optimizing building thermal performance, Behnam Mobaraki et al [28,29] proposed a Hyper Efficient Arduino Transmittance-meter (HEAT) based on low-cost technology to monitor U values. At the same time, through the results of an experimental activity, the influence of incorrectly positioned external sensors on the measurement accuracy of U values was evaluated.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Threshold Cable-Stayed Bridge Health Monitoring System Based on Temperature Effect Correction

Tan,

Guo,

Luo

et al. 2023

Sensors

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The early health warning of a cable-stayed bridge is of great significance for discovering the abnormal condition of the structure, eliminating the risk factors, and ensuring the normal operation of the bridge in order to set a reasonable safety monitoring threshold to ensure the safety warning and condition assessment of the bridge structure. A method of dynamic early warning by considering the temperature effect is adopted in this paper on the basis of the benchmark threshold. Based on the long-term deflection monitoring data of a bridge in Wuhan, the generalized Pareto distribution (GPD) extreme value analysis theory is used to set the benchmark threshold. Then, by constructing the seasonal autoregressive integrated moving average (SARIMA) long-span bridge temperature effect prediction model, the reference threshold is dynamically adjusted. Finally, it is compared with the traditional fixed threshold monitoring system. The results show that the dynamic threshold has stronger adaptability to the monitoring of cable-stayed bridges and can also achieve effective monitoring of local mutations in other periods. Dynamic threshold early warning can reduce the shortcomings of traditional early warning methods such as underreporting and misreporting. At the same time, the GPD extreme value analysis theory overcomes the disadvantage that the extreme value information is not fully utilized. It has an important application value for bridge health monitoring.

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“…Not all temperature distributions can be predicted; therefore, specific and extreme temperature distributions are employed to achieve practical design [10]. The availability of accurate and low-cost temperature measurement tools, such as thermal imaging cameras [40] and novel temperature sensors [41], enables the collection of distributed temperatures of bridges.…”

Section: Temperature Distributionsmentioning

confidence: 99%

Characterizing Bridge Thermal Response for Bridge Load Rating and Condition Assessment: A Parametric Study

Marchenko,

Kromanis,

Dorée

2024

Infrastructures

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Temperature is the main driver of bridge response. It is continuously applied and may have complex distributions across the bridge. Daily temperature loads force bridges to undergo deformations that are larger than or equal to peak-to-peak traffic loads. Bridge thermal response must therefore be accounted for when performing load rating and condition assessment. This study assesses the importance of characterizing bridge thermal response and separating it from traffic-induced response. Numerical replicas (i.e., fine element models) of a steel girder bridge are generated to validate the proposed methodology. Firstly, a variety of temperature distribution scenarios, such as those resulting from extreme weather conditions due to climate change, are modelled. Then, nominal traffic load scenarios are simulated, and bridge response is characterized. Finally, damage is modelled as a reduction in material stiffness due to corrosion. Bridge response to applied traffic load is different before and after the introduction of damage; however, it can only be correctly quantified when the bridge thermal response is accurately accounted for. The study emphasizes the importance of accounting for distributed temperature loads and characterizing bridge thermal response, which are important factors to consider both in bridge design and condition assessment.

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Studying the impacts of test condition and nonoptimal positioning of the sensors on the accuracy of the in-situ U-value measurement

Cited by 18 publications

References 55 publications

Application of Novel Phase Change Material Constructive Solution for Thermal Regulation of Passive Solar Buildings

Application of Novel Phase Change Material Constructive Solution for Thermal Regulation of Passive Solar Buildings

Dynamic Threshold Cable-Stayed Bridge Health Monitoring System Based on Temperature Effect Correction

Characterizing Bridge Thermal Response for Bridge Load Rating and Condition Assessment: A Parametric Study

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