Publications
Paraotwayite-Type α-Ni(OH)2 Nanowires: Structural, Optical and Electrochemical Properties
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Publication Year:
2013
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Publication Year:
2013
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Journal papers
Spectral and angular solar properties of a PCM-filled double glazing unit
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Publication Year:
2015
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Publication Year:
2015
Abstract: Background Phase change materials (PCMs) have been proposed as a means to increase the thermal inertia of glazing systems. These materials have optical features that need to be investigated and characterised in order to better understand the potential of these systems and to provide reliable data for numerical simulations. Methods The spectral and angular behaviour of different PCM glazing samples, characterised by different thicknesses of PCMs, were investigated by means of commercial spectrophotometer and by means of a dedicated optical test bed that includes a large integrating sphere with a diameter of 0.75 m. Such equipment was necessary because…
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Nullutslippsbygg bidrar til grønt skifte
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Publication Year:
2016
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Publication Year:
2016
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Analysis of load match and grid interaction indicators in net zero energy buildings with simulated and monitored data
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Publication Year:
2014
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Publication Year:
2014
Abstract The main objective of this paper is to contribute to the discussion on the role of Net Zero Energy Buildings (Net ZEBs) on future energy systems by the interplay between on-site generation and the building loads, often called load matching, and the resulting import/export interaction with the surrounding electricity grid, commonly named grid interaction. This investigation analyzes five case studies with high resolution data, three of which are based on real monitored buildings. The research aims at selecting and suggesting a limited set of quantitative indicators that: (a) can provide practical information for building as well as grid designers…
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Zero Emission Buildings – A National Research Centre
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Publication Year:
2010
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Publication Year:
2010
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Architectural design og Zero Emission Buildings - The case of the LivingLAB at the ZEB research centre
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Publication Year:
2016
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Publication Year:
2016
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Books
Silica aerogels - A multifunctional building material
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Publication Year:
2015
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Publication Year:
2015
Abstract Silica aerogels are a nanoporous material with extremely high porosity (up to ~99.8 %), low density (as low as ~0.005 g/cm3), and low thermal conductivity (~0.010–0.020 W/(mK)). Aerogels can also be made with a translucent or transparent state. These structural and functional features make aerogels a multifunctional material for many important applications. In this work, we discuss the perspective of aerogels as super insulation materials and window glazings in the building and construction sector. It shows that different research and development (R&D) strategies of aerogels shall be considered when aiming for different applications; reducing the manufacture cost, improving the…
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Experimental Pathways for Achieving Superinsulation through Nano Insulation Materials
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Publication Year:
2013
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Publication Year:
2013
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Towards zero energy and zero emission buildings and districts: trends and drivers
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Publication Year:
2011
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Publication Year:
2011
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Sustainability in Practice: Social Science Perspectives on Architectural Design, Research and the Implementation of Building Solutions
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Publication Year:
2014
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Publication Year:
2014
Fra et refleksivt praktiker-ståsted, undersøker avhandlingen utfordringer med kunnskapsintegrasjon på tvers av bygningssektorene. Et kritisk standpunkt blir testet konseptuelt og eksperimentelt i et tverrfaglig rammeverk som binder sammen litteratur fra arkitektur, byggvitenskap, byplanlegging og teknologi- og vitenskapsstudier (STS). Det empiriske grunnlaget for studien er intervjuer og spørreundersøkelser, som sammen utgjør et case fra Sveits. Avhandlingen evaluerer antagelser og praksiser knyttet til politikk for bærekraft og strategier for karbonreduksjon, i forhold til bygninger og det bygde miljøet. Studien er artikkelbasert, og rommer fire artikler som på forskjellige måter knytter teoretiske diskusjoner i feltet til praksis og politikkutvikling. Addressing the problem…
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Zero Emission Buildings Use and Operation
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Publication Year:
2015
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Publication Year:
2015
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Skal bygge verdens mest energivennlige skole på Kolstad
Publication Year:
2015
Publication Year:
2015
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The influence of different electricity-to-emissions conversion factors on the choice of insulation materials
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Publication Year:
2014
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Publication Year:
2014
Abstract The current practice of building energy upgrade typically uses thick layers of insulation in order to comply with the energy codes. Similarly, the Norwegian national energy codes for residential buildings are moving towards very low U-values for the building envelope. New and more advanced materials, such as vacuum insulation panels (VIPs) and aerogel, have been presented as alternative solutions to commonly used insulation materials. Both aerogel and VIPs offer very high thermal resistance, which is a favourable characteristic in energy upgrading as the same insulation level can be achieved with thinner insulation layers. This paper presents the results of energy…
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Success for energy efficient renovation of dwelling - Learing from private homeowners
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Publication Year:
2013
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Publication Year:
2013
Large scale energy efficient renovation of buildings is one of the most important tools to realize the society's need of a more sustainable building stock. Most Norwegians own their own homes. Therefore private homeowners are a focus group for the government urging to accelerate the dwelling energy efficiency rates. Success factors were identified in the in-depth study of the decision process of eleven homeowners. Large differences in energy use due to the building's condition and the occupants' behavior was encountered in the sample. Only homeowners who were conscious consumers and did not trust expert advice or that had special knowledge…
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Possibilites for characterization of a pcm window system large scale measurements
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Publication Year:
2012
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Publication Year:
2012
The introduction of dynamic envelope components and systems can have a significant reduction effect on heating and cooling demands. In addition, it can contribute to reduce the energy demand for artificial lighting by better utilization of the daylight. One of these promising technologies is Phase Change Materials (PCM). Here, the latent heat storage potential of the transition between solid and liquid state of a material is exploited to increase the thermal mass of the component. A PCM layer incorporated in a transparent component can increase the possibilities to harvest energy from solar radiation by reducing the heating/cooling demand and still…
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Snart har vi solceller i taket og nano i veggen
Publication Year:
2015
Publication Year:
2015
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Media contributions
Energy performance assessment of an advanced responsive multifunctional facade module: first results of an experimental campaign
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Publication Year:
2012
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Publication Year:
2012
Responsive Building Elements (RBEs) are technologies for the exploiting at the building scale renewable energy sources and the opportunities offered by the environment. Among the RBE concepts identified by the IEA-ECBCS Annex 44, Advanced Integrated Façades (AIFs) is probably one of the most promising technologies. Important players in the field of the façade have started to develop integrated modular façade systems (Multifunctional Façade Modules - MFMs), with a dynamic behaviour and interacting with the other building services, in order to reduce the building energy consumption and maximize the indoor comfort conditions. In the frame of a research activity aimed at…
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Conference papers
Multilayer glazing technologies: key performance and future perspectives
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Publication Year:
2016
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Publication Year:
2016
AbstractPrevious studies show that a large part of the net energy demands of an office building is related to window heat loss and cooling demands induced by solar irradiance. Windows with improved thermal transmittance (U-value) and solar heat gain coefficient (SHGC or g-value) are important for reducing the related energy demands.There is a scarcity of available scientific work addressing multilayer window technologies. Hence, in this study, simulations with the aim of identifying the parameters that play a key role in improving thermal performance of multilayer glazing units have been carried out. A state-of-the-art review is presented, alongside an overview of…
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Neste steg – fra passivhus til nullutslippsbygg
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Publication Year:
2010
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Publication Year:
2010
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Intelligente bygninger kan løse klimautfordringer. Fremtidens smarte bygninger.
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Publication Year:
2015
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Publication Year:
2015
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Life Cycle GHG Emissions of Material Use in the Living Laboratory
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Publication Year:
2015
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Publication Year:
2015
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Sustainability transitions outside the modernization paradigm. Gains and losses
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Publication Year:
2012
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Publication Year:
2012
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Presentasjon av skisser. Powerhouse-alliansens to første prosjekter
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Publication Year:
2012
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Publication Year:
2012
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Fra energisluk til energiprodusent
Publication Year:
2013
Publication Year:
2013
Et ordinært kontorbygg fra 80-tallet skal skape mer energi enn det bruker.
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From Passive House to Zero Emission Building: How much electricity generation is needed?
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Publication Year:
2010
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Publication Year:
2010
This paper shows how much electricity generation would be needed for a passive house to achieve a zero emission balance over the year, hence to become a Zero Emission Building, ZEB. The case study is based on the passive house apartment blocks built in 2008 in Løvåshagen, near Bergen, Norway, and the analysis focuses on the consequences of adopting different heating systems. With the carbon emission factors assumed, it is shown that the sole PV installation on the roof is generally not sufficient to generate all the electricity needed to achieve the ZEB balance. Possible integrations are the use of…
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Visible-Light Driven Photochromism of Hexagonal Sodium Tungsten Bronze Nanorods
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Publication Year:
2013
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Publication Year:
2013
Single-crystalline sodium tungsten bronze (Na-WO3) nanorods with typical diameters of 10−200 nm and lengths of several micrometers were prepared via hydrothermal synthesis. The as-prepared Na-WO3 nanorods crystallized in a hexagonal structure (space group P6/mmm) with unit cell parameters a=7.3166(8) Å and c= 3.8990(8) Å and elongated along the ⟨001⟩direction. Chemical analyses indicated a stoichiometry of Na0.18WO3.09·0.5H2O, revealing the existence of tunnel Na+ ions and water molecules in the structure, as confirmed also by the vibrational spectroscopic study. The as-prepared Na-WO3 nanorods exhibited a direct-allowed electronic transition with band-gap energy of about 2.5 eV, which allows a visible-light-driven photochromism related to…
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Journal papers
Nanoelectrochromics with Applied Materials and Methodologies
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Publication Year:
2010
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Publication Year:
2010
Electrochromic (EC) materials that change their optical transmittance under an external electrical field may form the basis of “smart windows”, which are of great interest in forthcoming building technologies. Nanostructured EC materials or assemblies have revealed remarkable improvement on colouration efficiency and switching time due to their small featured sizes and large surface areas. Here, the recent progress of nanoelectrochromics is reviewed; the scientific and technical issues related to material preparation and device assembly for large-area and large-scale window applications are discussed.
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The legal dwelling: how Norwegian research engineers domesticate construction law. Engineering Studies
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Publication Year:
2015
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Publication Year:
2015
Abstract The considerable amount of energy spent on the construction, maintenance, and demolition of buildings draws attention to sustainable development in the construction sector. Regarded as both tools and frameworks, laws are expected to sustain and speed technological innovation. With the STS (Science and Technology Studies) theory of domestication and in-depth interviews with building researchers studying zero emission buildings in Norway, I discuss the role of research engineers in the domestication of law, that is, the translation of European Directives for building codes and technical requirements, and the mediation of these legal frameworks for industry and practitioners. I classify two…
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Journal papers
Development of Nano Insulation Materials for Building Constructions
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Publication Year:
2015
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Publication Year:
2015
Abstract The application of superinsulation materials (SIM) reaching thermal conductivities far below 20 mW/(mK) allows the construction of relatively thin building envelopes while still maintaining a high thermal resistance, which also increases the architectural design possibilities for both new buildings and refurbishment of existing ones. To accomplish such a task without applying vacuum solutions and their inherit weaknesses may be possible from theoretical principles by utilizing the Knudsen effect for reduced thermal gas conductance in nanopores.This study presents the attempts to develop nano insulation materials (NIM) through the synthesis of hollow silica nanospheres (HSNS), indicating that HSNS may represent a promising candidate or stepping-stone for achieving SIM. Furthermore, initial…
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Conference papers
Nano insulation materials: synthesis and life cycle assessment
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Publication Year:
2014
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Publication Year:
2014
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Conference papers
"Cool Roofing" i nordisk klima – en motsigelse eller et potensial for energisparing?
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Publication Year:
2011
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Publication Year:
2011
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Popular Science Articles
Hvordan realisere regjeringens ambisjoner?
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Publication Year:
2013
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Publication Year:
2013
Er "intellegente byer" veien å gå? Siden nesten 2/3 av vårt energiforbruk er tilknyttet urbane miljø, vil såkalte "Smart Cities" eller intellegente byer spille en betydelig rolle vedrørende energiffektivitet.
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Cost-optimal energy system design in Zero Energy Buildings with resulting grid impact: A case study of a German multi-family house
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Publication Year:
2016
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Publication Year:
2016
Abstract Zero Energy Buildings (ZEBs) are considered as one of the key elements to meet the Energy Strategy of the European Union. This paper investigates cost-optimal solutions for the energy system design in a ZEB and the subsequent grid impact. We use a Mixed Integer Linear (MILP) optimisation model that simultaneously optimises the building’s energy system design and the hourly operation. As a ZEB have onsite energy generation to compensate for the energy consumption, it is both importing and exporting electricity. The hourly time resolution identifies the factors that influence this import/export situation, also known as the building’s grid impact.…
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Zero Emission Buildings and their architectural implications
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Publication Year:
2010
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Publication Year:
2010
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Conference presentations
Energikonsept for Powerhouse One
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Publication Year:
2012
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Publication Year:
2012
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Nanoelectrochromics for Smart Windows: Materials and Methodologies
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Publication Year:
2016
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Publication Year:
2016
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Conference papers
Social science perspectives on architectural design, research and the implementation of building solutions
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Publication Year:
2014
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Publication Year:
2014
Addressing the problem of knowledge integration across the building sectors, a critical stance is taken and tested conceptually, as well as experimentally within an interdisciplinary frame that draws together a number of key literatures from architecture, building science, urban studies, and STS. Empirically, the thesis is supported by a set of interviews and questionnaires that form a grounded case of Switzerland, which evaluates the assumptions and practices around sustainability policies and carbon reduction strategies for buildings and the built environment. As an article based dissertation comprised of four articles that are summarized below, the thesis aims to constructively connect theoretical…
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The interaction between building and users in passive and zero-energy housing and offices: The role of interfaces, knowledge and user commitment
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Publication Year:
2013
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Publication Year:
2013
The article's aim is to present user experiences with passive houses and zero-energy buildings. The focus is on the interaction between the building and the users, specifically on how user interfaces, knowledge, and commitment influence the use of the building and the level of energy consumption awareness.
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Journal papers
The impact of building morphology on energy consumption
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Publication Year:
2012
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Publication Year:
2012
Buildings are responsible for 38 % of energy use in Norway, about 64 % of which is heating energy. Lacking of architectural design at the early design stage has adverse consequences on the climate and environmental efficiency of buildings, which is a burden for reducing the energy consumption of buildings. This research uses Ådland project as a case study in order to investigate how the building morphology which is one aspect of the architectural quality will impact the heating demand of buildings. The research is based on the design which is ongoing in the Research Centre of Zero Emission Buildings…
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Grønne vinduer
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Publication Year:
2014
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Publication Year:
2014
Vinduer ble lenge betraktet som energisluk i vinter-Norge. Men utstyrt med siste nytt fra forskningsfronten på feltet, kan kontorbygg forbruke mindre energi enn bygninger helt uten vinduer.
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Nanomaterials for insulation application in Zero Emission Buildings
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Publication Year:
2011
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Publication Year:
2011
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Simulating switchable glazing with energy plus: an empirical validation and calibration of a thermotropic glazing model
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Publication Year:
2015
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Publication Year:
2015
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Conference papers
Search for the optimal window-to-wall ratio in office buildings in different European climates and the implications on total energy saving potential
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Publication Year:
2016
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Publication Year:
2016
Abstract This paper deals with the search for the optimal window-to-wall ratio (WWR) in different European climates in relation to an office building characterized by best-available technologies for building envelope components and installations. The optimal WWR value is the one that minimizes, on an annual basis, the sum of the energy use for heating, cooling and lighting. By means of integrated thermal and lighting simulations, the optimal WWR for each of the main orientations was found in four different locations, covering the mid-latitude region (35° to 60° N), from temperate to continental climates. Moreover, the robustness of the results was…
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Influence of PV technology and system design on the emission balance of a net zero emission building concept
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Publication Year:
2016
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Publication Year:
2016
Abstract This paper presents an analysis of how the design of a photovoltaic (PV) system influences the greenhouse gas emission balance in a net zero emission building (nZEB). In a zero emission building, the emissions associated both with the energy required in the operation of the building (operational emissions) and the energy used to produce the building materials (embodied emissions) are offset by renewable energy generated on-site (avoided emissions). The analysis is applied to a nZEB concept for a single-family building, developed by the Norwegian Research Centre on Zero Emission Buildings. Previous analyses have shown that the installation of a…
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The Research Centre on Zero Emission Buildings – ZEB Research and Teaching Examples
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Publication Year:
2014
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Publication Year:
2014
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