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  • 1
    In: Bauphysik, Wiley, Vol. 40, No. 5 ( 2018-10), p. 319-328
    Abstract: Simulations and evaluation of the indoor climate of depots and archives Art depots and archives require constant indoor air climate to avoid damage or degradation of archived goods. In addition this type of building has a long life expectancy. Therefore, operation energy costs are of particular importance. Passive measures show good results with regard to the indoor air conditions and help to save energy and subsequently depot building operation costs. In this paper, several retrofit variants designed for an existing building and different extension/remodeling cases for an existing building as well as for a new building of a museum depot have been investigated by hygrothermal building simulation. The evaluation of the results focuses on the stability of the indoor air climate and the operation energy demand. The influence of different air change rates and the effect of type and number of archive goods are analyzed.
    Type of Medium: Online Resource
    ISSN: 0171-5445 , 1437-0980
    URL: Issue
    RVK:
    RVK:
    Language: German
    Publisher: Wiley
    Publication Date: 2018
    detail.hit.zdb_id: 2151235-8
    detail.hit.zdb_id: 244802-6
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  • 2
    In: Buildings, MDPI AG, Vol. 12, No. 12 ( 2022-12-15), p. 2236-
    Abstract: Reducing the continuously growing cooling energy demand of buildings is an important part of achieving global emission targets. Here, we present an innovative scenario of how the integration of a programmable material into a climate-adaptive building envelope (CABE) can create an energy-efficient thermal management system inherent to the material. This novel concept is based on a thermoresponsive shape memory polymer foam (SMP) and is designed to regulate the flow of ambient air through the building envelope in order to enable natural cooling of the structure. Hygrothermal simulation data obtained by the software WUFI® Plus indicate that significant cooling energy saving potential may be accessible with this type of concept. As a possible material basis for a corresponding adaptive element, a reactive foamed polyurethane-based SMP foam is proposed, which is capable of executing a thermoreversible shape change of more than 20% while having a suitable switching temperature range. Finally, the ecological impact of such a functional foam element is evaluated in detail as well as its influence on the overall balance of a façade construction by means of a life cycle assessment (LCA).
    Type of Medium: Online Resource
    ISSN: 2075-5309
    Language: English
    Publisher: MDPI AG
    Publication Date: 2022
    detail.hit.zdb_id: 2661539-3
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  • 3
    Online Resource
    Online Resource
    Informa UK Limited ; 2018
    In:  Studies in Conservation Vol. 63, No. sup1 ( 2018-08-01), p. 366-368
    In: Studies in Conservation, Informa UK Limited, Vol. 63, No. sup1 ( 2018-08-01), p. 366-368
    Type of Medium: Online Resource
    ISSN: 0039-3630 , 2047-0584
    RVK:
    Language: English
    Publisher: Informa UK Limited
    Publication Date: 2018
    detail.hit.zdb_id: 2203409-2
    detail.hit.zdb_id: 128590-7
    SSG: 24,1
    SSG: 9,10
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  • 4
    In: Energies, MDPI AG, Vol. 14, No. 12 ( 2021-06-10), p. 3440-
    Abstract: The research project Fraunhofer Cluster of Excellence “Programmable Materials” aims to develop new materials that can change their properties according to defined boundaries. This article describes the development and use of a novel programmable phase change material (PCM) for latent heat storage applications. At the moment, these PCMs have a programmable trigger mechanism incorporated that activates the crystallization of the material as a reaction to a defined stimulus so that the stored heat is released. In future development stages, programmability is to be integrated on the material level. The latent heat storage that is based on PCMs can be recharged by using the energy of the sun. As an example, for a possible application of such a material, the use of a novel programmable PCM in greenhouses to support heating energy reduction or to reduce the risk of frost is explained. Using the hygrothermal simulation tool WUFI® Plus, the effects in greenhouse constructions without and with commercially available or novel programmable PCMs are calculated and presented in the present article. The calculations are based on the material data of calcium chloride hexahydrate (CaCl2-6H2O), as this material serves as a basic material for the development of programmable PCM compositions. The results of the simulations show a positive impact on the indoor temperatures in greenhouses in view of the risk of frost and the reduction of heating energy. Thus, the vegetation period can be extended in combination with a lower energy load. By an eligible actuation mechanism, an inherent material system for temperature control can be created.
    Type of Medium: Online Resource
    ISSN: 1996-1073
    Language: English
    Publisher: MDPI AG
    Publication Date: 2021
    detail.hit.zdb_id: 2437446-5
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  • 5
    Online Resource
    Online Resource
    Wiley ; 2007
    In:  Bauphysik Vol. 29, No. 3 ( 2007-07), p. 178-186
    In: Bauphysik, Wiley, Vol. 29, No. 3 ( 2007-07), p. 178-186
    Type of Medium: Online Resource
    ISSN: 0171-5445 , 1437-0980
    URL: Issue
    RVK:
    RVK:
    Language: German
    Publisher: Wiley
    Publication Date: 2007
    detail.hit.zdb_id: 2151235-8
    detail.hit.zdb_id: 244802-6
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  • 6
    Online Resource
    Online Resource
    SAGE Publications ; 2007
    In:  Journal of Building Physics Vol. 30, No. 3 ( 2007-01), p. 261-274
    In: Journal of Building Physics, SAGE Publications, Vol. 30, No. 3 ( 2007-01), p. 261-274
    Abstract: An increased interest in moisture buffering in the indoor environment and the development of more refined hygrothermal calculation tools call for a better understanding of the phenomenon. There are many materials indoors with potential to act as moisture buffers, ranging from traditional finishing materials as gypsum plaster to textiles. The objective of this study is to show that the interest in moisture buffering is not a new issue. There have been significant laboratory studies made in the past. This study presents a review of such previous studies (1960-2000) on indoor surface materials from Germany and Sweden, not published in English before.
    Type of Medium: Online Resource
    ISSN: 1744-2591 , 1744-2583
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2007
    detail.hit.zdb_id: 2211917-6
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  • 7
    In: Bauphysik, Wiley, Vol. 33, No. 5 ( 2011-10), p. 287-298
    Abstract: Auf dem Freilandversuchsgelände des Fraunhofer‐Instituts für Bauphysik (IBP) in Holzkirchen wurde das Feuchte‐ und Wärmeverhalten verschiedener Wandaufbauten aus Holz (geschlitzte Holzkonstruktion, Massivholzkonstruktion, Dämmsteinkonstruktion, Holzplattenkonstruktion, Brettstapelkonstruktion) über die Dauer eines Jahres getestet. Folgende Größen wurden gemessen: Innenraumklima, Außen‐ und Innenoberflächentemperaturen sowie die Temperaturen an den Grenzschichten, die Wärmestromdichte auf der Innenseite der Bauteile, die relative Luftfeuchte sowie die Holzfeuchte. Das Ziel der Arbeit war einerseits, die verschiedenen Aufbauten unter realen Bedingungen zu vergleichen, andererseits wurden die ermittelten Messdaten für Validierungsberechnungen mittels der Simulationssoftware WUFI®Pro und Delphin verwendet. Die gemessenen, instationären U‐Werte stimmen in den Wintermonaten mit den stationär bestimmten Werten gut überein. Bei den Simulationsberechnungen ergeben sich deutlich bessere Ergebnisse, wenn die an der ETH Zürich gemessenen deutlich tieferen Wärmeleitfähigkeiten für Holz anstelle der Normwerte in die Simulation eingesetzt werden. Obwohl bei vier Bauelementen keine Hinterlüftung der Holzfassade bestand, wurden keine kritischen Werte bezüglich der relativen Luftfeuchte innerhalb jener Wandkonstruktionen gemessen. Bei der Simulation der relativen Luftfeuchten zeigten beide Programme teilweise starke Abweichungen gegenüber den gemessenen Werten. Comparative measurements of heat and moisture transfer in different wood‐based building elements. At the campus of the Fraunhofer Institute for Building Physics (IBP) in Holzkirchen/Germany comparative measurements of heat and moisture transfer in five different wood‐based building elements were carried out (wood construction with slotted wood elements, solid wood construction connected with wooden dowels, new developed soft fibreboard brick construction, solid wood panel construction, wood frame construction with stacked wood elements). The elements were installed on the west side of the test building and examined during one year. The following physical quantities were measured: indoor climate, external and internal surface temperatures, temperatures in the boundary layers, heat flux through the internal surface of the constructions, relative humidity and moisture content. Furthermore, the measured data were used for validation of the simulation softwares WUFI®Pro and Delphin. During winter, the measured U‐values (from unsteady‐state values) were compared with steady‐state calculated U‐values. Both values were well coincident. Moreover, the simulation results achieved good agreement by using the thermal conductivity values measured at ETH Zurich, which were considerably lower than the standard values. Although, the four elements had been covered with a non rear‐ventilated façade, no critical values of relative humidity were measured inside the constructions. The simulation results of relative humidity have partly shown large deviations from measured data by both simulation softwares.
    Type of Medium: Online Resource
    ISSN: 0171-5445 , 1437-0980
    URL: Issue
    RVK:
    RVK:
    Language: English
    Publisher: Wiley
    Publication Date: 2011
    detail.hit.zdb_id: 2151235-8
    detail.hit.zdb_id: 244802-6
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