Publications
Efficient space-heating of super-insulated envelopes: detailed dynamic simulation of wood stoves in a detached house typology
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Publication Year:
2011
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2011
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Efficiency of the Hydronic System used for the Space-Heating of Passive Envelopes
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Publication Year:
2012
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2012
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Effektiv energibruk og energiforsyning/lokal produksjon i fremtidens bygninger
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2012
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2012
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Effekt- og energisimuleringer
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2012
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2012
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Effective ventilation in high performance buildings
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2015
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2015
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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
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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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Effect of Ageing on Service Life of Vacuum Insulation Panels
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Publication Year:
2010
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2010
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Economic feasibility and zero emission buildings – a state-of-the-art report
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2014
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Publication Year:
2014
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Early decision tools in selecting renewable energy solutions for Zero Emission Buildings
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Publication Year:
2011
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Publication Year:
2011
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Dynamic thermal performance of a PCM window system: characterization using large scale measurements
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Publication Year:
2015
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Publication Year:
2015
Abstract Introduction of more dynamic building envelope components have been done throughout the last decades in order to try to increase indoor thermal comfort and reduce energy need in buildings for both temperature and light control. One of these promising technologies is phase change materials (PCM), where, the latent heat storage potential of the transition between solid and liquid state of a material is utilized as thermal mass. 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 allowing the utilization of daylight. The introduction…
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Dynamic Solar Radiation Control in Buildings by Applying Electrochromic Materials
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Publication Year:
2010
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Publication Year:
2010
Smart windows like electrochromic windows (ECWs) are windows which are able to regulate the solar radiation throughput by application of an external voltage. The ECWs may decrease heating, cooling and electricity loads in buildings by admitting the optimum level of solar energy and daylight into the buildings at any given time, e.g. cold winter climate versus warm summer climate demands. In order to achieve as dynamic and flexible solar radiation control as possible, the ECWs may be characterized by a number of solar radiation glazing factors, i.e. ultraviolet solar transmittance, visible solar transmittance, solar transmittance, solar material protection factor, solar…
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Dynamic Building Envelope Components and nearly Zero Energy Buildings: Theoretical and experimental analysis of concepts, systems and technologies for an adaptive building skin
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Publication Year:
2013
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Publication Year:
2013
Due to the significant impact of the building sector on greenhouse gas emissions, newer and stricter regulations aimed at reducing total energy use in buildings have appeared in the last few years. In the European context, all the new constructions will thus soon be asked to be nearly Zero Energy Buildings (nZEB). In order to reach this target, new concepts and technologies capable of further improving buildings’ energy efficiency need to be developed. A very promising strategy to overcome current technology limitations is represented by revisiting the conventional approach that considers the building as a static object and moves towards…
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Dynamic building envelope components and nearly zero energy buildings
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Publication Year:
2014
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Publication Year:
2014
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Durability of Vacuum Insulation Panels in Alkaline Environment
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Publication Year:
2012
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2012
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Droppet solfangere i siste liten
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2014
Publication Year:
2014
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Domesticating the built environment
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2010
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2010
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Domesticating Spaces: Sociotechnical Studies and the Built Environment
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Publication Year:
2011
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Publication Year:
2011
The main aim of this article is to rephrase good and bad performance of built environments as good or bad interplay of spaces, building technologies, and users. To support this perspective, two conceptual tools broadly used within the social study of technology are introduced. These concepts, the semiotic pair “script/antiprogram” and the study of “domestication of media and technology in everyday life,” were originally developed in the search for a better understanding of the mutual shaping of culture/society and technology. In this contribution, these concepts are applied in an empirical study of two nonresidential buildings. Through an extension of these…
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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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Development of a New Thermally Insulating and Structural Green Concrete for Lean Constructions
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Publication Year:
2016
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Publication Year:
2016
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Development of a Model for Radon Concentration in Indoor Air
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Publication Year:
2012
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Publication Year:
2012
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Development of a CO2 emissions accounting method for Norwegian Zero Emission Buildings
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Publication Year:
2011
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Publication Year:
2011
Energy-plus, zero energy and zero emission buildings denote some of the best buildings of today and the future with respect to energy efficiency and environmental impact. A zero emission building might be defined in different ways. Nevertheless, the main concept is that renewable energy sources produced or transformed at the building site have to compensate for CO2 emissions from operation of the building and for production, transport and demolition of all the building materials and components during the life cycle of the building. In order to fulfill this, CO2 emission data has to be made available and verified for traditional…
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Dette bygget lager mer energi enn det bruker
Publication Year:
2012
Publication Year:
2012
Næringsbygg blir kraftverk. Rehabiliterte bygg som prduserer energi kan dekke inn mer enn 40 prosent av verdens energiforbruk. Oppslag i Aftenposten vedrørende oppussing av kontorbygg på Kjørbo i Bærum.
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Det store bildet. Hvor er vi nå?
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Publication Year:
2012
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2012
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Det råeste plusshuset finner du i Larvik
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2014
Publication Year:
2014
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Designing for ideal users: how experts in the construction sector interpret users’ behaviours
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2011
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2011
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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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Publication Year:
2014
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Publication Year:
2014
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Design phase calculation of greenhouse gas emissions for a zero-emission residential pilot building
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Publication Year:
2016
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Publication Year:
2016
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Design of a Zero Energy Office Building at Haakonsvern
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Publication Year:
2012
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Publication Year:
2012
An office building of about 2000 m2 heated floor area is being designed for the Norwegian Defense Estates Agency (Forsvarsbygg). The building will be located at Haakonsvern, about 15 km from the centre of Bergen, Norway. The design aims at meeting the ZEB criterion of net zero energy balance for building operation during a year. The energy for operation of the plug loads (computers, printers, etc.) is not included in the balance.
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Design guidelins for energy efficient concepts in office buildings in Norway
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Publication Year:
2011
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Publication Year:
2011
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Depotbygget på Haakonsvern, Bergen
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2012
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2012
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Dealing with uncertainty in sustainable innovation: mainstreaming and substitution
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2010
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Publication Year:
2010
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Critical Sensible and Latent Effectiveness for Membrane Type Energy Recovery Ventilator (ERV) in Cold Climates
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Publication Year:
2013
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Publication Year:
2013
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Criteria for Definition of Net Zero Energy Buildings
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Publication Year:
2010
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2010
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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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Cost Optimality of Energy Systems in Zero Emission Buildings in Early Design Phase
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Publication Year:
2014
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Publication Year:
2014
Abstract During the uncontrolled consumption period the building sector has come to account one of the greatest proportions of greenhouse gas emissions and energy use in industrial countries. In this context, European countries have decided to address the environmental challenge by promoting the use of renewable energies and the implementation of low energy consumption requirements. For these reasons, zero emission buildings, which have a net zero annual energy demand, were regarded as a possible solution. And everything points to believe that they will continue to be crucial in a recent future. Consultants and contractors have shown the need towards a…
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Cost Optimality of Energy System in Zero Emission Buildings in Early Design Phase
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Publication Year:
2013
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Publication Year:
2013
A survey among relevant consultants and contractors shows the need for better knowledge and more systematic information in order to make decisions regarding the selection of system for energy supply of ZEBs (Zero Emission Buildings). The ZEB centre aims to develop a computerbased tool for this purpose that will include both a calculation tool and an information database. This assignment will be part of this development. The main objective of this work is to evaluate the cost optimality of different energy systems for a ZEB using the European cost optimal methodology introduced in the context of the EPBD (Energy Performance…
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Core-shell typed Ag@SiO2 nanoparticles as solar selective coating materials
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Publication Year:
2013
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Publication Year:
2013
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Journal papers
Cooling of PV panels by natural convection
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Publication Year:
2013
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Publication Year:
2013
Building Integrated Photovoltaic (BIPV) is an important source of renewable energy production for Zero Emission Buildings, even in Norwegian climate. In the planned Powerhouse 1 building at Brattøra in Trondheim the idea to reach a zero emission building level is to use PVs as a roofing material covering the entire roof. Challenges and questions raised in the design process of this building have motivated the work reported here.
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Cool roofing in cold climates: A contradiction or a potential for energy savings?
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Publication Year:
2011
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Publication Year:
2011
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Convective heat transfer between rooms in nordic passive houses
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Publication Year:
2015
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Publication Year:
2015
Abstract In highly-insulated buildings such as passive houses, the space-heating distribution subsystem can be simplified by reducing the number of heat emitters. In this context, the bi-directional flow through open doorways is known to be an efficient process to support the heat distribution between rooms. This process is therefore investigated using field measurements within a Norwegian passive house. The so-called large opening approximation proves to model fairly the mass flow rate, but also the convective heat transfer if the thermal stratification is accounted for. Furthermore, the discharge coefficient appears to be independent of the heater type and location in the room.
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Conference papers
Convective heat transfer between rooms in nordic passive houses
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Publication Year:
2015
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Publication Year:
2015
Abstract In highly-insulated buildings such as passive houses, the space-heating distribution subsystem can be simplified by reducing the number of heat emitters. In this context, the bi-directional flow through open doorways is known to be an efficient process to support the heat distribution between rooms. This process is therefore investigated using field measurements within a Norwegian passive house. The so-called large opening approximation proves to model fairly the mass flow rate, but also the convective heat transfer if the thermal stratification is accounted for. Furthermore, the discharge coefficient appears to be independent of the heater type and location in the…
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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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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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Comparative Analysis of PV Shading Devices for Energy Performance and Daylight
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Publication Year:
2012
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Publication Year:
2012
The comfort and energy demand of a building are influenced significantly by glazed area of the facade. The glazed areas in the building are always challenging. Large glazing allows more daylight to get into the room but at the same time cause more heat gain and heat loss through the building envelop. Shading devices are very suitable elements for installing PV panels. The aim of this study is to evaluate the potential impact of different PV shading devices on energy performance and daylight of office buildings in Nordic climate. This dissertation is based on literature studies of relevant books and…
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Comparative Analysis of PV Shading Devices for Eneregy Performance and Daylight
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Publication Year:
2012
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Publication Year:
2012
The comfort and energy demand of a building are influenced significantly by glazed area of the facade. The glazed areas in the building are always challenging. Large glazing allows more daylight to get into the room but at the same time cause more heat gain and heat loss through the building envelop. Shading devices are very suitable elements for installing PV panels. The aim of this study is to evaluate the potential impact of different PV shading devices on energy performance and daylight of office buildings in Nordic climate.
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Comfort and Energy Efficiency Recommendations for Net Zero Energy Buildings
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Publication Year:
2010
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Publication Year:
2010
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CO2 emissions in different scenarios of electricity generation in Europe
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Publication Year:
2011
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Publication Year:
2011
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CO2 emissions from Biofuels and District Heating
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Publication Year:
2013
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Publication Year:
2013
Carbon Debt and Carbon Payback time have recently been introduced into the Norwegian debate on greenhouse gas emissions, challenging the established view that Biofuels are carbon neutral. This report demonstrates that these new concepts are primarily a reflection of how the temporal system boundaries for CO2 emissions from biofuels are viewed. In a short term perspective it is possible that CO2 emissions from biofuels may have a non-zero short term climate effect, even though biofuels will be carbon neutral on the order of a century. Two alternative, more useful new concepts for analysis of climate effects of biofuels are described…
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Characterization of the optical properties of a PCM glazing system
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Publication Year:
2012
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Publication Year:
2012
The optical characteristics of an advanced glazing system are presented in this paper. The investigated glazing system is based on the incorporation of a paraffin-based Phase Change Material (PCM) into a transparent component, made of two extra-clear glass panes and a cavity where the PCM layer is placed. Due to the highly scattering property of the system (when the PCM is in solid state), the use of a large integrating sphere equipment (75 cm diameter) is necessary to obtain reliable results. The spectral transmission, reflection and absorption coefficients of the PCM glazing system are measured between 400 and 2000 nanometers,…
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