Publications
I superisolerte boliger er det spesielt ett rom som skaper problemer
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2016
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2016
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ZEB Pilot buildings – overview
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2016
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2016
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Følge seg friskere i nullutslippshus
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2016
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2016
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Development of a New Thermally Insulating and Structural Green Concrete for Lean Constructions
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2016
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2016
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Architectural design og Zero Emission Buildings - The case of the LivingLAB at the ZEB research centre
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2016
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2016
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Books
Two exemplar green developments in Norway: Tales of qualculation and Nonqualculation
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2016
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2016
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Books
Nye råd om bruk av konveksjonssperre
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2016
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2016
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Integrated ground source heat pumps and solar thermal systems for zero energy buildings
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2016
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2016
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Design phase calculation of greenhouse gas emissions for a zero-emission residential pilot building
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2016
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2016
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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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Embodied greenhouse gas emissions from PV systems in Norwegian residential Zero Emission Pilot Buildings
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Publication Year:
2016
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2016
Abstract Greenhouse gas (GHG) emissions from the combustion of fossil energy need to be reduced to combat global climate change. For zero energy and Zero Emission Buildings (ZEB), photovoltaic solar energy systems are often installed. When the goal is to build a life cycle Zero Emission Building, all emissions come under scrutiny. Emissions from photovoltaic (PV) energy systems in Zero Emission Buildings have been shown to have a relative large share of material emissions. In this paper, we compare GHG emissions per kW h of electricity and greenhouse gas emission payback times (GPBT) for three residential PV systems in Zero Emission…
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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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Calcined clay as an alternative binder: A further step towards achieving thermally insulating structural concrete based on aerogel
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2015
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2015
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Performance of a lab-scale membrane-based energy exchanger
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2015
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2015
Abstract Efficient energy recovery from used air with the goal of reducing energy use is important for realizing low energy houses. Rotary heat exchangers are very energy efficient, but have the drawback of transferring odours from exhaust air to fresh supply air. To avoid this, flat plate heat exchangers are commonly used where odour transfer might cause problems. Nevertheless, these may not properly handle water condensation and frost formation at low outdoor temperatures. The so-called membrane-based energy exchangers are an alternative to the flat plate heat exchanger. In a membrane-based exchanger, moisture is transferred from the humid exhaust air to…
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Accelerated ageing and durability of double-glazed sealed insulating windows panes and impact on heating demand in buildings
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Publication Year:
2016
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Publication Year:
2016
Abstract A crucial property for double-glazed sealed insulating window panes is to maintain their thermal insulating properties and thus low U-values. However, degradation and thus subsequent reduction or loss of low-conductance gas concentration may occur in the sealed glazing units by their exposure to outdoor climate. The choice of spacers is important to keep as low thermal transport through the window panes as possible, i.e. low U-value. In addition, the type of spacers may also influence their durability and resistance towards ageing, which hence may be characterized by the low-conductance noble gas concentration, e.g. argon, krypton or xenon. Ageing and…
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Nye isolasjonsmaterialer i verneverdige bygg – muligheter og begrensninger
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2016
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2016
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Nullenergi, plusshus, nullutslipp - hva betyr dette i praksis? Presentasjon av eksempler
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2016
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Publication Year:
2016
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Design strategies for low embodied energy and greenhouse gases in buildings: analyses of the IEA Annex 57 case studies
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2014
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2014
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Powerhouse Kjørbo. Evaluation of construction process and early use phase
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2016
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2016
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Reports
Effect of storage and curing conditions at elevated temperatures on aerogel-incorporated mortar samples based on UHPC recipe
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Publication Year:
2016
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2016
Abstract The effect of elevated temperature during storage and curing of ultra-high performance concrete (UHPC) formulated aerogel-incorporated mortar (AIM) samples was investigated. It was found that an effective aerogel loading of 60 vol% of total bulk volume was possible for producing AIM samples with suitable thermal and mechanical properties under optimized storing and curing conditions. AIM samples with compressive strengths of up to ≈19 MPa was achieved and the corresponding thermal conductivity was ≈0.4 W/(mK). For more insulating concrete, 70 vol% aerogel was needed and AIM samples with thermal conductivity as low as ≈0.1 W/(mK) were cast. In general, AIM samples with strengths of up…
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Compliance and deviation. How occupants interact with a high performance zero emission building
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Publication Year:
2016
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2016
Abstract The Trondheim living lab is a newly built detached single family home that is planned to reach a zero emission balance over the course of its lifetime. This is achieved by a broad variety of technical strategies such as passive and active energy design and efficient installations. The degree of automation of the building's environmental services (such as heating, cooling, ventilation, and light) has been left open to be able to test different control scenarios: manual, automatic and several modes combining both approaches. In the first wave of qualitative experiments conducted in the laboratory between September 2015 and March…
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Metode for bærekraftig optimalisering av ventilasjonssystemer: PhD-kandidater ble tildelt best paper award
Publication Year:
2016
Publication Year:
2016
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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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Professor savner solcellesatsing i Norge
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2016
Publication Year:
2016
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Aerogel vs. argon insulation in windows: A greenhouse gas emissions analysis
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Publication Year:
2016
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Publication Year:
2016
Abstract The scope of this study is a comprehensive analysis of the greenhouse gas emissions from the partial substitution of triple-glazing units with argon gas (U-value of 0.79 W/m2 K) with double-glazing units with either monolithic aerogel (U-value of 0.65 W/m2 K) or granular aerogel (U-value of 0.31 W/m2d K). A residential building located near Oslo and fully upgraded with passive house solutions is used as a case study for this analysis. A cradle-to-site analysis is performed on the facade components. Two replacement schedules and three window-to-wall ratios are used to evaluate the differences in total emissions. Sensitivity analyses based on increasing the fraction of the…
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Elektrokrome vindu for smart solstyring
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2016
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Publication Year:
2016
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Hvordan oppfylle ulike temperaturønsker i stue, soverom og bad med lavest mulig energibruk?
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2016
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2016
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Making a home in Living Lab: the limitations and potentials associated with living in a research laboratory
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Publication Year:
2016
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Publication Year:
2016
Abstract Living Lab is a two bedroomed detached house on the edge of the university campus in Trondheim. It is also a research laboratory which is testing state of the art technology committed to achieving Zero emissions within a 100m2 dwelling. The first qualitative experiment in Living Lab will take place from September 2015 to April 2016, when six different resident groups comprising of two to four people, will make Living Lab their home for a period twenty-five days each. The resident groups were chosen because they are associated with three basic demographic categories; students under 30 who are already…
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Materialer i energi- og klimaregnskapet – Hvor viktig er det?
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2016
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2016
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Mulige energiforsyningsløsninger for områder som Zero Village Bergen
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Publication Year:
2016
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2016
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Naturlig ventilasjon i nullutslippsbygg
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Publication Year:
2012
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Publication Year:
2012
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The Research Center on Zero Emission Buildings
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Publication Year:
2015
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2015
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Case study on residential building renovation and its impact on the energy use and thermal comfort
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Publication Year:
2014
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Publication Year:
2014
Abstract In Norway, a large portion of the building stock originates from the period from 1955 to 1990. Many of these buildings fail to comply with the current building regulations regarding the energy consumption. In this study, the possibility for upgrading a hypothetical apartment building with an oil-based heating system has been investigated employing simulations from the IDA Indoor Climate and Energy software. For the construction of the original building, customs and regulations from the period 1981-90 were employed, and the building envelope was upgraded to the requirements of the Norwegian research centre on Zero Emission Buildings. Two alternative heating…
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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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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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Analysis of grid interaction indicators in net zero-energy buildings with sub-hourly collected data
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Publication Year:
2015
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Publication Year:
2015
Abstract This paper aimed to contribute to the discussion about the role of net zero-energy buildings (ZEBs) or nearly ZEBs in future energy systems, from the perspective of the resulting import/export interaction with the surrounding energy grid (commonly named grid interaction (GI)). This investigation analyses three buildings with measured data at sub-hourly time resolution. The goal of this paper was to quantify the effect of using high-resolution data (one or a few minutes) versus hourly resolution in the GI analysis of buildings with an on-site generation system. A limited set of quantitative GI indicators have been selected: the generation multiple,…
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Optimization of solar energy potential for buildings in urban areas – a Norwegian case study
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Publication Year:
2014
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Publication Year:
2014
Abstract The paper presents a case study of an office building with a façade integrated PV system in Norway. Due to the urban surrounding the PV system is subject to significant overshadowing. The aim is to optimize the solar energy potential of the building in order to propose improved alternatives to the current system applying a multi-level simulation approach. The first level is performed to calculate the maximum solar potential on the building envelope in an unobstructed scenario. The second level examines the shading effect on the building in its urban context. The analyses allow localizing the areas of the…
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The impact of an ideal dynamic building envelope on the energy performance of low energy office buildings
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Publication Year:
2014
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Publication Year:
2014
Abstract This paper shows the results of a research activity aimed at assessing the advantages of an ideal adaptive building skin over conventional building envelope systems. The basic idea underlying the research consists in imagining an ideal building envelope system characterised by the capability of continuously changing (within a certain range) some of its thermo-physical and optical properties. The reason for the continuous tuning of thermo-physical and optical properties lies in the assumption that an optimised (fixed) configuration, where the properties do not change over time, is not able to minimise the total energy demand of the building at each…
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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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Intelligente bygninger kan løse klimautfordringer
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Publication Year:
2015
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Publication Year:
2015
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Snart har vi solceller i taket og nano i veggen
Publication Year:
2015
Publication Year:
2015
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Review of heat/energy recovery exchangers for use in ZEBs in cold climate countries
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Publication Year:
2014
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Publication Year:
2014
Abstract Realisation of Zero Energy Buildings (ZEB) for residential use cannot succeed without: minimising leakages, increasing thermal insulation and using reliable and energy efficient system solutions. However, very airtight houses may have a negative impact on thermal comfort and indoor air quality. Focussing on ventilation systems then becomes a requirement. In cold climates, temperature differences between indoor and outdoor air often exceed 40 °C during winter. State-of-the-art heat recovery systems may not be able to handle these differences while providing proper air quality and preventing excessively dry indoor air. The present study of energy recovery systems focuses on apartment buildings located…
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Energy efficient buildings – status and challenges
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Publication Year:
2014
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Publication Year:
2014
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Passiv versus aktiv – samproduksjoner og innramminger av fremtidens bygg
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Publication Year:
2014
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2014
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Low-emissivity materials for building applications: a state-of-the-art review and future research perspective
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Publication Year:
2015
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Publication Year:
2015
Abstract Low-emissivity (low-e) materials can be used in order to reduce energy usage in both opaque and transparent areas of a building. The main focus for low-e materials is to reduce the heat transfer through thermal radiation. Furthermore, low-e materials will also influence on the daylight and total solar radiation energy throughput in windows, the latter one often characterized as the solar heat gain coefficient (SHGC). This work reviews low-e materials and products found on the market, and their possible implementations and benefits when used in buildings. The SHGC is often left out by many countries in energy labellings of…
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Phase Change Materials for Building Applications: A State-of-the-Art review and Future Research Opportunities
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Publication Year:
2015
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Publication Year:
2015
Abstract Phase change materials (PCM) have received considerable attention over the last decade for use in latent heat thermal storage (LHTS) systems. PCMs give the ability to store passive solar and other heat gains as latent heat within a specific temperature range, leading to a reduction of energy usage, an increase in thermal comfort by smoothing out temperature fluctuations throughout the day and a reduction and/or shift in peak loads. The interest around PCMs has been growing significantly over the last decade. Hence, several commercial products have arrived on the market with various areas of use in building applications. This…
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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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Experimental Investigations of Aerogel-Incorporated Ultra-High Performance Concrete
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Publication Year:
2015
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Publication Year:
2015
Abstract Improvements to concrete will have a large impact in the construction and building sector. As the attention is drawn towards energy-efficient and zero emission buildings, the thermal properties of concrete will be important. Attempts are being made to decrease the thermal conductivity of concrete composites while retaining as much as possible of the mechanical strength. In this study experimental investigations of aerogel-incorporated mortar (AIM) with up to 80 vol% aerogel are prepared utilizing a reduced ultra-high performance concrete (UHPC) recipe. It was found that at 50 vol% aerogel content, the AIM sample possessed a compressive strength of 20 MPa and a thermal…
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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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The ZEB Research Centre and Pilot Buildings
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Publication Year:
2015
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Publication Year:
2015
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