Onsite monitoring of a wall retrofitted with an external vacuum insulation composite system

Gonçalves, Márcio; Serra, Catarina; Simões, N.; Flores‐Colen, Inês; Kokolsky, Carolin; Sprengard, Christoph

doi:10.1016/j.jobe.2021.103301

Cited by 4 publications

(4 citation statements)

References 21 publications

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“…Depending on the structure of the test element, the indoor and outdoor temperature stability, and the data analysis method (either the average method for steadystate conditions or the dynamic method), the minimum duration of the test could range between 72 h and 7 days [11,30]. The data collected onsite is mostly analyzed using the average method because of its simple calculation procedures [38]. The average method and the summation method are similar to each other, specifically in terms of their simplicity and their dependency on measuring conditions.…”

Section: Heat Flow Meter Sensors For In Situ Measurementsmentioning

confidence: 99%

“…Gonçalves et al [38] stated that the average method would assume that the U-value of the element could be achieved by dividing the mean density of the heat flow rate by the mean environmental (ambient) temperature difference. Assuming that the index j is related to individual measurements, the U-value (W.m −2 .K −1 ) can be obtained using the following equation:…”

Section: Heat Flow Meter Sensors For In Situ Measurementsmentioning

confidence: 99%

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Review of the Experimental Methods for Evaluation of Windows’ Thermal Transmittance: From Standardized Tests to New Possibilities

2023

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One of the most important parameters that indicate the energy performance of a window system is the thermal transmittance (U-value). Many research studies that deal with numerical methods of determining a window’s U-value have been carried out. However, the possible assumptions and simplifications associated with numerical methods and simulation tools could increase the risk of under- or over-estimation of the U-value. For this reason, several experimental methods for investigating the U-value of windows have been developed to be used either alone or as a supplementary method for validation purposes. This review aims to analyze the main experimental methods for assessing the U-value of windows that have been published by national and international standards or as scientific papers. The analysis criteria include the type of the test in terms of boundary conditions (laboratory or in situ), the part of the window that was tested (only the center of glazing or the entire window), and the data analysis method (steady-state or dynamic). The experimental methods include the heat flow meter (HFM) method, guarded hot plate (GHP) method, hot box (HB) method, infrared thermography (IRT) method, and the so-called rapid U-value metering method. This review has been set out to give insights into the procedure, the necessary equipment units, the required length of time, the accuracy, the advantages and disadvantages, new possibilities, and the gaps associated with each method. In the end, it describes a set of challenges that are designed to provide more comprehensive, realistic, and reliable tests.

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Section: Heat Flow Meter Sensors For In Situ Measurementsmentioning

confidence: 99%

Section: Heat Flow Meter Sensors For In Situ Measurementsmentioning

confidence: 99%

Review of the Experimental Methods for Evaluation of Windows’ Thermal Transmittance: From Standardized Tests to New Possibilities

2023

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“…Additionally, two sensors are located inside the building to measure indoor air temperature and humidity, and one sensor was placed outside the building to measure outdoor air temperature and humidity. More details about this case study are provided in Gonçalves et al [11].…”

Section: Case Studymentioning

confidence: 99%

Overview of the Performance of an External Vacuum Insulation Composite System

Simões

Gonçalves

Serra

et al. 2022

WIT Transactions on the Built Environment

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The external thermal insulation composite system (ETICS) is a construction technology commonly used for insulating building walls. Incorporating a super-insulation material, such as vacuum insulation panel (VIP), ETICS is a solution with great potential for improving the thermal performance of façades towards achieving nearly-zero energy buildings. However, the application of VIPs in buildings presents several challenges that need to be taken into account. Namely, those associated with handling and installation issues, design factors, as well as with the edge thermal bridging that occurs between panels, the doubts surrounding long-term performance and the high investment costs of vacuum technology. Also, conventional ETICS often presents early-signs of anomalies that could be worsened by using VIPs. Thus, many aspects need to be evaluated before VIP based ETICS become a viable solution. The main goal of this paper was to study the feasibility of incorporating a VIP solution into ETICS. For this purpose, an extensive investigation into the solution was carried out, following mainly experimental approaches. First, focus was put on the VIP thermal performance, in particular regarding the edge thermal bridging effect. Then, VIP-based ETICS walls were evaluated in terms of the whole system hygrothermal performance and durability. Real onsite walls and laboratory large-scale test specimens were assessed. New experimental procedures were defined to evaluate the durability of the solution and to enable the early identification of potential anomalies, in particular when exposed to solar radiation. Lastly, the cost-effectiveness of vacuum technology was analysed by means of a life cycle costing assessment. This research indicates that VIPs can be successfully used in ETICS. Nevertheless, such integration needs to be meticulously performed, since concerns specific to VIP installation need to be taken into account.

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“…Even for large surfaces, you can choose to extend a cord with the help of a spraying machine and place the insulating plates on it. The ETICS tends to have good mechanical resistance, CO 2 permeability, impermeability to water and water vapor [24], and along with these benefits, diverse studies have shown that the systems really do contribute to improving the thermal behavior of buildings [25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Quantification of the Improvement in Sustainability after a Comparative Experimental Study of Single-Family Homes with Façade Rehabilitation Using the External Thermal Insulation Composite System

Vidales-Barriguete,

Piña Ramírez,

Vidales Barriguete

et al. 2024

Sustainability

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This study emerged from the necessity to analyze the most effective energy-saving strategies within the current real estate market and substantiate their application with empirical data. Undoubtedly, the adoption of External Thermal Insulation Composite Systems (ETICSs) stands out as one of the prevalent approaches. This article presents temperature-monitoring data collected on-site from the facades of two single-family homes initially constructed with identical compositions, materials, construction dates, locations, and orientations. The thermal envelope of one home underwent rehabilitation using the ETICS, while the other remained in its original state. Continuous temperature recordings on the southern and northwestern facades of both homes were conducted using thermocouples over a 15-day period. The data analysis yielded insights into facade performance before and after this rehabilitation approach. The findings suggest that the implementation of ETICS results in more stable interior temperatures, significantly reducing indoor temperatures in comparison to outdoor conditions, leading to a notable decrease in heat energy loss. Consequently, this research underscores the tangible benefits of employing ETICS in building rehabilitation, emphasizing its role as a passive energy-saving strategy. By demonstrating the positive impact on thermal performance and energy efficiency, this study reinforces the vital connection between research endeavors and sustainability objectives.

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Onsite monitoring of a wall retrofitted with an external vacuum insulation composite system

Cited by 4 publications

References 21 publications

Review of the Experimental Methods for Evaluation of Windows’ Thermal Transmittance: From Standardized Tests to New Possibilities

Review of the Experimental Methods for Evaluation of Windows’ Thermal Transmittance: From Standardized Tests to New Possibilities

Overview of the Performance of an External Vacuum Insulation Composite System

Quantification of the Improvement in Sustainability after a Comparative Experimental Study of Single-Family Homes with Façade Rehabilitation Using the External Thermal Insulation Composite System

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