Publications
Solar shading control strategies in cold climates – heating, cooling demand and daylight availability in office spaces
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Publication Year:
2014
Authors:
Publication Year:
2014
Abstract Modern office buildings often have large glazed areas. Incident solar radiation can lead to large cooling demands during hot periods although the solar radiation can help reduce heating demands during cool periods.Previous studies have shown that large parts of the net energy demand of an office building is related to window heat loss and cooling demands induced by solar irradiance. In this article, the authors found that, even in what traditionally has been considered to be a heating-dominated climate, cooling demands dominate the net energy demand of an office building. Solar shading systems are vital to reduce the cooling…
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Life cycle analysis of two nZEB concepts
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Publication Year:
2014
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Publication Year:
2014
Abstract The net-zero emissions building (nZEB) performance is investigated for building operation (EO) and embodied emissions in materials (EE) for Norway's cold climate. nZEB concepts for new residential and office buildings are conceived in order to understand the balance and implications between operational and embodied emissions over the building's life. The main drivers for the CO2 equivalent (CO2e) emissions are revealed for both building concepts through a detailed emissions calculation. The influence of the CO2e factor for electricity is emphasized and it is shown to have significant impact on the temporal evolution of the overall CO2e emissions balance. The results…
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Net-zero buildings: incorporating embodied impacts.
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Publication Year:
2014
Authors:
Publication Year:
2014
Abstract The design and assessment of net-zero buildings commonly focus exclusively on the operational phase, ignoring the embodied environmental impacts over the building life cycle. An analysis is presented on the consequences of integrating embodied impacts into the assessment of the environmental advantageousness of net-zero concepts. Fundamental issues needing consideration in the design process – based on the evaluation of primary energy use and related greenhouse gas emissions – are examined by comparing three net-zero building design and assessment cases: (1) no embodied impacts included, net balance limited to the operation stage only; (2) embodied impacts included but evaluated separately…
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Thermal superinsulation for building applications – From concepts to experimental investigations
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Publication Year:
2014
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Publication Year:
2014
Abstract The application of traditional thermal insulation materials requires thicker building envelopes in order to satisfy the requirements of the emerging zero energy and zero emission buildings. This work summarizes the steps from the state-of-theart thermal insulation materials and solutions, like vacuum insulation panels (VIP), gas-filled panels (GFP) and aerogels which all have various drawbacks, to our concepts and experimental investigations for making superinsulation materials (SIM) like e.g. nano insulation materials (NIM).
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Silica aerogels – a multifunctional building materials
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Publication Year:
2014
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Publication Year:
2014
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Spesielt, nytt og lærerikt
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2014
Publication Year:
2014
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Nå kan du få teste hvordan det er å bo i et nullhus
Publication Year:
2014
Publication Year:
2014
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Material research for Zero Emission Buildings
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Publication Year:
2014
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Publication Year:
2014
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This House in Norway Produces More Energy than It Consumes
Publication Year:
2014
Publication Year:
2014
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Materialer - energi og utslipp - isolasjonsmaterialer
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Publication Year:
2014
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Publication Year:
2014
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Norske skole kan bli verdens beste klimabygg
Publication Year:
2015
Publication Year:
2015
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Spectral and angular solar properties of a PCM-filled double glazing unit
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Publication Year:
2015
Authors:
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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Det råeste plusshuset finner du i Larvik
Publication Year:
2014
Publication Year:
2014
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Zero Emission Buildings
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Publication Year:
2014
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Publication Year:
2014
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Holder ikke med et passivhus her og et plusshus der
Publication Year:
2014
Publication Year:
2014
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Fra passivhus til karbonnøytrale boligområder
Publication Year:
2014
Publication Year:
2014
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Kunnskapsstatus – Fuktbufring I materialer og påvirkning på energibehov
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Publication Year:
2015
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Publication Year:
2015
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Identifying key design parameters of the integrated energy system for a residential Zero Emission Building in Norway
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Publication Year:
2015
Authors:
Publication Year:
2015
Abstract This study examined an integrated solution of the building energy supply system consisting of flat plate solar thermal collectors in combination with a ground-source heat pump and an exhaust air heat pump for the heating and cooling, and production of domestic hot water. The supply energy system was proposed to a 202 m2 single-family demo dwelling (SFD), which is defined by the Norwegian Zero Emission Building standard. The main design parameters were analyzed in order to find the most essential parameters, which could significantly influenced the total energy use. This study found that 85% of the total heating demand of the…
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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
Authors:
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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Embodied greenhouse gas emissions from PV systems in Norwegian residential Zero Emission Pilot Buildings
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Publication Year:
2016
Authors:
Publication Year:
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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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
Authors:
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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Performance of a lab-scale membrane-based energy exchanger
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Publication Year:
2015
Authors:
Publication Year:
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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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
Authors:
Publication Year:
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
Authors:
Publication Year:
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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Mulige energiforsyningsløsninger for områder som Zero Village Bergen
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Publication Year:
2016
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Publication Year:
2016
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Materialer i energi- og klimaregnskapet – Hvor viktig er det?
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Publication Year:
2016
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Publication Year:
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
Authors:
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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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
Authors:
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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Powerhouse Kjørbo. Evaluation of construction process and early use phase
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Publication Year:
2016
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Publication Year:
2016
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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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Forsvarsbygg: - I teten blant Norges grønneste bygg
Publication Year:
2016
Publication Year:
2016
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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
Authors:
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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Transparent facades in low energy office buildings Numerical simulations and experimental studies
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Publication Year:
2015
Authors:
Publication Year:
2015
Windows are a key component in the building envelope. They are often, thought of as energy drains and something associated with excessive energy demands in a building. However, in order to assess the energy performance of a window, several factors must be addressed. The most important issues to consider are energy losses due to heat transmission through windows, energy gains from solar radiation as well as transmitted visible light and the influence on artificial lighting demands. Factors like thermal and visual comfort in buildings are additional factors that need to be assessed and addressed. Existing work that has been carried…
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Nullenergi, plusshus, nullutslipp - hva betyr dette i praksis? Presentasjon av eksempler
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Publication Year:
2016
Authors:
Publication Year:
2016
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Her skal studentene bo og leve i et laboratorium med utskiftbare vegger
Publication Year:
2016
Publication Year:
2016
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Prosjektet i mål - blant Norges mest energieffektive bygg
Publication Year:
2016
Publication Year:
2016
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Hvordan oppfylle ulike temperaturønsker i stue, soverom og bad med lavest mulig energibruk?
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Publication Year:
2016
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Publication Year:
2016
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Elektrokrome vindu for smart solstyring
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Publication Year:
2016
Authors:
Publication Year:
2016
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Nye råd om bruk av konveksjonssperre
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Publication Year:
2016
Authors:
Publication Year:
2016
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