Closed translucent façade elements with switchable U -value—A novel option for energy management via the facade

Pflug, Thibault; Kuhn, Tilmann E.; Nörenberg, Ralf; Glück, Andre; Nestle, Nikolaus; Mäurer, Christoph

doi:10.1016/j.enbuild.2014.09.082

Cited by 43 publications

(26 citation statements)

References 9 publications

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“…If the cavity is empty except for the insulation panel, a convection roll can form around the panel as shown in figure 2-1a. It was shown both theoretically and experimentally that this convection process sets on spontaneously for temperature differences in the range of a few K [2]. The U-value of the cavity element with convection active is around 2 W/Km².…”

Section: Switching U-values By Convection Controlmentioning

confidence: 98%

“…Within the cavity, a translucent insulation package and a rollable foil insulation are ar-ranged in the way shown in the figure. This approach combines two concepts for switchable insulation that have been described earlier [2,3,4] in a synergistic way. At the same time, also adaptive g-values can be achieved due to the broad-band reflection of solar radiation by metalized foil insulation.…”

Section: Basic Technical Concepts For the Adaptive Wall Elementmentioning

confidence: 99%

“…State of the art capillary plates come with thermal conductivities in the range of 80 mW/Km (but with excellent translucence and light guiding properties). Classical insulation foams such as EPS come with only minor translucence and even foams such as white Basotect® that exhibits a notable translucence in the range of a few percent at about 3 cm thickness [2] has almost no more recognizable translucence at a thickness of 10 cm. Some aerogel materials come with better translucence at thicknesses relevant for insulation and an even better performance might be reached with vacuum glazing.…”

Section: Constructive Details and Materials Issuesmentioning

confidence: 99%

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Translucent wall elements with switchable U‐ and g‐value

et al. 2018

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This contribution will present a concept for translucent wall elements with switchable U‐value and g‐value. The basic concept of the element consists of an translucent insulation panel (preferably realized by a translucent and light‐guiding foam grid or in the future by transparent vacuum glazing) which is arranged inside a glazed closed cavity in a way that thermally driven convection around the element can either be enabled or suppressed. Suppression of convection is realized by a rollable second insulation which at the same time is reflecting incident solar radiation: If the secondary insulation is fully retracted resulting in high U‐value and g‐value and daylight being guided inside the building. By successively rolling down the insulation, convection can be suppressed and the g‐value can be varied from almost unchanged to almost zero. In the case of the secondary insulation being rolled fully down, the U‐value of the element is also minimal. This state is favourable in a cold winter night or during hot daytime hours in winter. The high translucence, low‐U‐value case is favourable in conditions where solar gains and good insulation are favourable and the translucent high‐U‐value case is favourable when no strong energetic separation of interior and exterior conditions is needed. While the rollable insulation element is a rather delicate structure, it nevertheless can be used as a shading device independent of external wind conditions as it is safely housed inside the glazed wall element. In addition to the concept of the wall element, the need for appropriate building control strategies allowing to make optimal use of the element's potential to save energy for lighting, cooling and heating and demonstrators for various design generations of the element are discussed. Furthermore, the potential for including further functionalities such as harvesting thermal or electrical energy from the element's outer surface is addressed as well.

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Section: Switching U-values By Convection Controlmentioning

confidence: 98%

Section: Basic Technical Concepts For the Adaptive Wall Elementmentioning

confidence: 99%

Section: Constructive Details and Materials Issuesmentioning

confidence: 99%

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Translucent wall elements with switchable U‐ and g‐value

et al. 2018

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“…The topic of adaptive facades topics generate considerable research interest, but the results are scattered, mainly due to terminological reasons. In the review from 2018 Romano et al (2018) state, that in the context of building facades the term "adaptive" is "often associated in the literature with a long list of similar terms" including: active (Luo et al, 2019), adaptable; adjustable; biomimetic (López et al, 2017);bio-inspired, controllable;kinetic;intelligent (Böke et al, 2018);interactive;living;modifying;movable;polyvalent;reactive;reconfigurable;reflexive;resilient;responsive (Negroponte, 1976); selective; sensitive; sentient; smart; switchable (Pflug et al, 2015); transformable; transient; and passive. Moreover, there is no consistent definition of façade adaptability, as different authors approach the topic from a different perspective.…”

Section: Literature Reviewmentioning

confidence: 99%

A typology of adaptive façades. An empirical study based on the morphology of glazed facades

Brzezicki

2021

Cogent Arts & Humanities

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A building's façade is its main interface with the external environment. Adaptive façade, one recent invention in the façade industry, has the capability to change its behaviour in real-time to respond to internal and/or external parameters, by means of materials, components, and systems. Among these, the adaptive shading and the façade glazing are two components that must fit together. This paper focuses on the spatial relationship between these components. It presents the results of the morphological analysis of façades with adaptive shading systems and the spatial relation between the adaptive shading system and the building's glass envelope. To characterise this relation, we formulated two measures: depth and distance. The results revealed four types of such relations: (i) the shading elements are located outside the building's glass envelope, (ii) they are covered by the glass envelope, (iii) they are located between the layers of the glazing façade, and (iv) they represent thin coatings that are flush with the surface of the glass. These results provide important insights into the emergence of new aesthetical trends in architecture, especially given the most recent technologies adopted in façades. In conclusion, we bring empirical evidence that the location of the shading system in relation to the glass envelope of a building is the key morphological Marcin Brzezicki

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“…• heat gains on the outer layer, through the variable solar absorptance of the cladding can be obtained by integrating thermochromic coatings [35][36][37][38] of automated Kinetic Claddings (see Figure 1); • heat transfer, either by (a) air-flow exchange between different facade elements (see Figure 2) [39][40][41][42][43][44][45] or (b) by conduction, by modifying the thermal heat transfer of facade elements (see Figure 3) [11,[46][47][48][49][50][51][52][53][54]; • thermal storage, by integrating materials which have latent heat storage at ambient temperature [55][56][57][58]; • humidity air-content [59][60][61][62].…”

Section: Adaptive Opaque Facades: An Innovative Concept Born In the Rmentioning

confidence: 99%

Development and Validation of a Roadmap to Assist the Performance-Based Early-Stage Design Process of Adaptive Opaque Facades

et al. 2020

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Adaptive Opaque Facades (AOF) is an innovative concept with potential to achieve low carbon energy buildings. However, so far AOF are not integrated in the construction industry. One remarkable issue that designers have when dealing with alternative low-carbon technologies, such as AOF, is the absence of previous built experiences and the lack of specialised technical knowledge. Design roadmaps can be convenient solutions to guide pioneer low carbon technology applications. This work presents a roadmap to assist the performance-based early-stage design process of Adaptive Opaque Facades. Previous research developed new approaches and tools to assist on the construction definition of AOF, so that their adaptive thermal performance was considered when specific design decisions needed to be made. The roadmap presented in this paper organises the implementation sequence of each methodological approach and tools in different design stages, which aims to provide a holistic design approach for AOF. The usability of the roadmap was validated in a workshop called “Performance-based Design and Assessment of Adaptive Facades” with master students representing the target group of this roadmap. Even though these students had never heard about AOF before, they could successfully design, define the early-stage characteristics of an AOF and quantify the thermal performance of their AOF designs. The roadmap was proven to be a useful support, which might make the implementation of AOF more approachable in the future.

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Closed translucent façade elements with switchable U -value—A novel option for energy management via the facade

Cited by 43 publications

References 9 publications

Translucent wall elements with switchable U‐ and g‐value

Translucent wall elements with switchable U‐ and g‐value

A typology of adaptive façades. An empirical study based on the morphology of glazed facades

Development and Validation of a Roadmap to Assist the Performance-Based Early-Stage Design Process of Adaptive Opaque Facades

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