Numerical examination of thermal bridging effects at the edges of vacuum-insulation-panels (VIP) in various constructions

Sprengard, Christoph; Holm, Andreas

doi:10.1016/j.enbuild.2014.03.027

Cited by 46 publications

(10 citation statements)

References 3 publications

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“…Effective thermal transmittance was estimated in consideration of heat transmittance of the EWP, the linear thermal transmittance of its slabs, and the linear thermal transmittance of the connection parts. It was also estimated in consideration of the size of the EWP, the area size for construction, and thermal bridge effects [34,35]. The difference between the effective thermal transmittance with multi-dimensional calculation-considered linear thermal transmittance and thermal transmittance with one-dimensional calculation is very high [36,37].…”

Section: Discussionmentioning

confidence: 99%

Thermal Behavior and Measures to Prevent Condensation of a Newly Developed External Wall Panel

et al. 2019

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An external wall panel (EWP) as a novel alternative to provide spatial flexibility and improve the performance of external walls was developed. The purpose of this study was to analyze the thermal performance of this EWP. A simulation analysis was carried out to scrutinize whether it was vulnerable to condensation, considering South Korea's weather conditions, and find countermeasures to prevent this. Results indicated that the indoor surface temperature with the measures of added insulation materials and an inserted thermal-breaker was over 16.5 • C and that these methods could prevent condensation. In addition, this study assessed unsteady-state thermal characteristics, linear thermal transmittance, and the effective thermal transmittance of EWP. Effective thermal transmittance was estimated in consideration of the heat transmittance of EWP and the linear thermal transmittance of its slabs and its connection parts. The thermal characteristics of the building envelope are needed to analyze effective thermal transmittance and linear thermal transmittance-associated thermal bridges.Sustainability 2019, 11, 912 2 of 14 reparability and improved performance. With this background, this study developed an EWP that could be detached and attached as a novel alternative to provide spatial flexibility and improve the performance of external walls. This EWP was developed for external insulation to minimize thermal bridging effects, and its module systems could provide easy constructability.External wall design and selection of its materials are important elements of the building envelope. The external wall is a non-structural material, a protective covering that is fixed on the outdoor surface of a building and used to protect against moisture and thermal variations while providing aesthetic purposes [10]. The envelope of a building is a factor that has the greatest influence on the environment inside the building [11]. The building envelope separates the indoor environment that is air-conditioned by heating and cooling systems from the external environment that is not air-conditioned [12]. It protects indoor space from weather conditions and large fluctuations in temperature. A proper building envelope provides thermal comfort for occupants and conserves building energy at the same time [13,14].Several studies have investigated the thermal performance of external walls or claddings. Bojic et al. reported the thermal behaviors of residential buildings by varying the thickness and positions of thermal insulation to walls. They found out that the largest reduction of the cooling demand was observed when thermal insulation was located either at the outer or indoor side of the wall [15]. In addition, Bojic and Loveday have investigated the thermal effect of layer distribution and the relative thickness of building insulation on building envelopes. In their study, the location of insulation in the wall can significantly influence thermal behaviors in buildings [16]. A similar study regarding thermal performance by differentiati...

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Section: Discussionmentioning

confidence: 99%

Thermal Behavior and Measures to Prevent Condensation of a Newly Developed External Wall Panel

et al. 2019

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“…Barrier envelopes currently used for VIP encapsulation are produced by vacuum deposition of aluminium layers on top of poly(ethylene terephthalate) (PET) films and lamination of up to three such films together with a polyethylene (PE) sealing film [1,5]. Due to their much lower thickness, the thermal bridge effect for vacuum deposited aluminium layers is significantly lower than for aluminium foils [13]. Laminates containing up to three metallized films can reach gas permeabilities down to 2-5 × 10 −15 m 3 (STP) m −2 day −1 Pa −1 at 23 • C and 50% RH and water vapour transmission rates of 1-5 × 10 −6 kg m −2 day −1 at 23 • C and 85% → 0% RH [1] and therefore can fulfil the barrier requirements for the building applications.…”

Section: Introductionmentioning

confidence: 99%

Studies on the barrier performance and adhesion strength of novel barrier films for vacuum insulation panels

Miesbauer

Kücükpinar

Kiese

et al. 2014

Energy and Buildings

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“…The reduction in thermal resistance in regular stud walls due to air leakage has been found to range from only 1 to 2% when airtight foam filled the whole cavity, to 20% when insulation was permeable for air and moisture, or a large unfilled air space existed in the cavity. This deviation may be even more pronounced in similar walls with VIPs as the relative effect of thermal bridges and other sources of unexpected heat losses can be much stronger than that of conventionally insulated walls [12]. Furthermore, the low permeance of the gas barrier membranes increases the risk of moisture accumulation in the wall and forces air and moisture toward defects in the wall and the edges of the panels [13].…”

Section: Introductionmentioning

confidence: 99%

Thermal performance of a building envelope incorporating ETICS with vacuum insulation panels and EPS

Mandilaras

Atsonios

Zannis

et al. 2014

Energy and Buildings

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Numerical examination of thermal bridging effects at the edges of vacuum-insulation-panels (VIP) in various constructions

Cited by 46 publications

References 3 publications

Thermal Behavior and Measures to Prevent Condensation of a Newly Developed External Wall Panel

Thermal Behavior and Measures to Prevent Condensation of a Newly Developed External Wall Panel

Studies on the barrier performance and adhesion strength of novel barrier films for vacuum insulation panels

Thermal performance of a building envelope incorporating ETICS with vacuum insulation panels and EPS

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