Jan-Olof Dalenbäck

Professor at Department of Civil and Environmental Engineering, Building Services Engineering

Jan-Olof Dalenbäcks R&D focus is on reduced use of energy in buildings and other spaces that have demands on a certain climate and/or activity. His special topics are solar energy applications and energy efficiency. He is profile leader in Energy Area of Advance och participates as expert and advisor in different national and international, academic and industry, groupings. He got IEA SHC Solar Award 2005 and ISES Special Service Award 2009.

Source: chalmers.se

Projects

2016–2019

Planning support for energy renovation of existing multifamily buildings - II

Jan-Olof Dalenbäck Department of Civil and Environmental Engineering, Building Services Engineering
Abolfazl Sousanabadi Farahani Department of Civil and Environmental Engineering, Building Services Engineering
Swedish Energy Agency

2013–2016

Självverkande kylbaffelsystem

Jan-Olof Dalenbäck Department of Civil and Environmental Engineering, Building Services Engineering
Peter J Filipsson Department of Civil and Environmental Engineering, Building Services Engineering
Jonas Gräslund Department of Civil and Environmental Engineering, Building Services Engineering
Anders Trüschel Department of Civil and Environmental Engineering, Building Services Engineering
SBUF

2013–2014

Metodik för energiberäkning

Jan-Olof Dalenbäck Department of Energy and Environment, Building Services Engineering
Peter J Filipsson Department of Energy and Environment, Building Services Engineering
Byggherrarna Sverige AB

2015–2015

Uppföljning av anläggningar med behovsstyrd ventilation, DCV

Jan-Olof Dalenbäck Department of Civil and Environmental Engineering, Building Services Engineering
Anders Trüschel Department of Civil and Environmental Engineering, Building Services Engineering
Mattias Gruber Department of Energy and Environment, Building Services Engineering
Midroc Property Development

2015–2017

Comparison of control strategies for heating systems in multifamily buildings based on measurements

Jan-Olof Dalenbäck Department of Civil and Environmental Engineering, Building Services Engineering
Anders Trüschel Department of Civil and Environmental Engineering, Building Services Engineering
Swedish Energy Agency

2013–2016

Planning support for energy renovation of existing multifamily buildings

Jan-Olof Dalenbäck Department of Civil and Environmental Engineering, Building Services Engineering
Abolfazl Sousanabadi Farahani Department of Civil and Environmental Engineering, Building Services Engineering
Swedish Energy Agency

2016–2017

Möjligheter och begränsningar för egenanvänd solel i Västra Gårdsten

Jan-Olof Dalenbäck Department of Civil and Environmental Engineering, Building Services Engineering
Maria Haegermark Department of Civil and Environmental Engineering, Building Services Engineering
Swedish Energy Agency
Energiforsk AB

2015–2018

Innemiljökvalitet och energieffektivitet i skolbyggnader: Utveckling av kriterier baserade på skolbarnens behov

Jan-Olof Dalenbäck Department of Civil and Environmental Engineering, Building Services Engineering
Lars Ekberg Department of Energy and Environment, Building Services Engineering
Despoina Teli Department of Civil and Environmental Engineering, Building Services Engineering
VINNOVA

2014–2018

National Transdisciplinary Centre of Excellence for Integrated Sustainable Renovation (SIRen)

Jan-Olof Dalenbäck Department of Civil and Environmental Engineering, Building Services Engineering
Holger Wallbaum Department of Civil and Environmental Engineering, Building Technology
Paula Femenias Department of Architecture, Building Design
Jenny Stenberg Department of Architecture, Architecture Theory and Method
Pär Johansson Department of Civil and Environmental Engineering, Building Technology
Formas

2014–2017

Towards improved compliance and quality of the works for better performing buildings

Paula Wahlgren Department of Civil and Environmental Engineering, Building Technology
Pär Johansson Department of Civil and Environmental Engineering, Building Technology
Jan-Olof Dalenbäck Department of Civil and Environmental Engineering, Building Services Engineering
European Commission (EC)

2013–2015

Testbädd för nya solenergilösningar med fokus på teknik- och affärsutveckling

Jan-Olof Dalenbäck Department of Civil and Environmental Engineering, Building Services Engineering
Maria Haegermark Department of Civil and Environmental Engineering, Building Services Engineering
SP Technical Research Institute of Sweden

2013–2015

Bioenergy and solar heat for 100% renewable heat supply

Jan-Olof Dalenbäck Department of Civil and Environmental Engineering, Building Services Engineering
Swedish Energy Agency

There might be more projects where Jan-Olof Dalenbäck participates, but you have to be logged in as a Chalmers employee to see them.

Publications

2016

Potential energy consumption reduction of automotive climate control systems

Filip Nielsen, A. Uddheim, Jan-Olof Dalenbäck et al
Applied Thermal Engineering. Vol. 106, p. 381-389
Scientific journal article - peer reviewed
2016

Induction ratio of active chilled beams - Measurement methods and influencing parameters

Peter Filipsson, Anders Trüschel, Jonas Gräslund et al
Energy and Buildings. Vol. 129, p. 445-451
Scientific journal article - peer reviewed
2016

Winter thermal comfort and indoor air quality in Swedish grade school classrooms, as assessed by the children

Despoina Teli, Jan-Olof Dalenbäck, Lars Ekberg et al
Proceedings of the 14th International Conference of Indoor Air Quality and Climate Ghent, Belgium July 3-8 2016
Conference paper - peer reviewed
2016

Heat exchanger design aspects related to noise in heat pump applications

O. Gustafsson, C. Haglund Stignor, Jan-Olof Dalenbäck et al
Applied Thermal Engineering. Vol. 93, p. 742-749
Scientific journal article - peer reviewed
2016

Reduction of Energy Used for Vehicle Interior Climate

Filip Nielsen, Åsa Uddheim, Jan-Olof Dalenbäck et al
SAE Technical paper, SAE World Congress, Cobo Center, Detroit, April 12-14, 2016
Conference paper - peer reviewed
2016

Reversing air-source heat pumps - Noise at defrost initiation and a noise reducing strategy AN J, 2009, International Journal of Refrigeration, V32, P1112

O. Gustafsson, C. Teuillieres, H. Hellgren et al
International Journal of Refrigeration-Revue Internationale Du Froid. Vol. 62, p. 137-144
Scientific journal article - peer reviewed
2015

Simulation of Energy Used for Vehicle Interior Climate

Filip Nielsen, Sam Robjer Gullman, Fredrik Wallin et al
SAE International Journal of Passenger Cars - Mechanical Systems. Vol. 8 (4), p. 1218-1234
Scientific journal article - peer reviewed
2015

Energy efficient climate control in office buildings without giving up implementability

Mattias Gruber, Anders Trüschel, Jan-Olof Dalenbäck et al
Applied Energy. Vol. 154, p. 934-943
Scientific journal article - peer reviewed
2015

Energideklarationerna behöver kvalitetssäkras

Pär Johansson, Jan-Olof Dalenbäck, Paula Wahlgren et al
Bygg & Teknik. Vol. 2015 (2), p. 44-45
Journal article - popular science
2015

Potential of residential buildings as thermal energy storage in district heating systems - Results from a pilot test

Johan Kensby, Anders Trüschel, Jan-Olof Dalenbäck et al
Applied Energy. Vol. 137, p. 773-781
Scientific journal article - peer reviewed
2014

Measurements of Energy Used for Vehicle Interior Climate

Filip Nielsen, Åsa Uddheim, Jan-Olof Dalenbäck et al
SAE International Journal of Passenger Cars- Mechanical Systems. Vol. 7 (4), p. 1404-1416
Scientific journal article - peer reviewed
2014

BAPV and BIPV Installation Trends in Sweden

Maria Haegermark, Jan-Olof Dalenbäck,
Proceedings Eurosun 2014
Conference paper - non peer reviewed
2014

ANALYSIS OF A NOVEL SOLAR DISTRICT HEATING SYSTEM

Christian Nielsen, Maria Haegermark, Jan-Olof Dalenbäck et al
EuroSun Conference Proceedings 2014
Conference paper - non peer reviewed
2014

Det behövs en nationell databas för solcellsanläggningar

Jan-Olof Dalenbäck,
Energimagasinet (7/2014), p. 28-29
Journal/newspaper article
2014

330 GW solvärme och 140 GW solkraft – är det mycket eller lite ?

Jan-Olof Dalenbäck,
Energimagasinet (6/2014), p. 32-33
Journal article - popular science
2014

Vi vill ha en plan, inte fler kafferaster!

Jan-Olof Dalenbäck, Lars Andrén, Andrew Machirant et al
Energimagasinet (5/2014), p. 52-53
Journal/newspaper article
2014

Ökat intresse för solfjärrvärme i Europa

Jan-Olof Dalenbäck,
Energimagasinet (5/2014), p. 44-48
Journal article - popular science
2014

Snart har tåget gått för de svenska aktörerna

Jan-Olof Dalenbäck, Lars Andrén,
Energimagasinet (4/2014), p. 28-29
Journal/newspaper article
2014

Viktigt att samarbeta och sprida kunskap

Jan-Olof Dalenbäck, Lars Andrén,
Energimagasinet (2/2014), p. 28-29
Journal article - popular science
2014

Droppen urholkar stenen

Jan-Olof Dalenbäck, Lars Andrén,
Energimagasinet (1/2014), p. 40-41
Journal article - popular science
2014

NEW SOLAR HEATED RESIDENTIAL AREA IN VALLDA HEBERG - INITIAL EXPERIENCES RELATED TO SYSTEM PERFORMANCE

Jan-Olof Dalenbäck, Maria Haegermark, Henrik Olsson et al
Proceedings 2nd Solar District Heating Conference (IEE EC-project)
Conference paper - non peer reviewed
2014

Inför primärenergifaktorer i byggreglerna

Johnny Kellner, Jonas Gräslund, Jan-Olof Dalenbäck et al
VVS Forum (1/2014), p. 80-81
Journal article - popular science
2014

UTILIZING BUILDINGS AS SHORT-TERM THERMAL ENERGY STORAGE

Johan Kensby, Anders Trüschel, Jan-Olof Dalenbäck et al
The 14th International Symposium on District Heating and Cooling, September 7th to September 9th, 2014, Stockholm, Sweden, p. 211-220
Conference paper - peer reviewed
2014

Combining performance and implementability of model-based controllers for indoor climate control in office buildings

Mattias Gruber, Anders Trüschel, Jan-Olof Dalenbäck et al
Building and Environment. Vol. 82, p. 228-236
Scientific journal article - peer reviewed
2014

CO2 sensors for occupancy estimations: Potential in building automation applications

Mattias Gruber, Anders Trüschel, Jan-Olof Dalenbäck et al
Energy and Buildings. Vol. 84, p. 548-556
Scientific journal article - peer reviewed
2014

Alternative strategies for supply air temperature control in office buildings

Mattias Gruber, Anders Trüschel, Jan-Olof Dalenbäck et al
Energy and Buildings. Vol. 82, p. 406-415
Scientific journal article - peer reviewed
2014

Ställ tekniska egenskapskrav och använd deklarationerna

Jan-Olof Dalenbäck, Dennis Johansson, Hans Lind et al
Energi & Miljö. Vol. 2014 (4), p. 40-41
Journal article - popular science
2013

Dags att ompröva BBR:s krav på energianvändning?

Jan-Olof Dalenbäck,
Byggindustrin
Journal/newspaper article
2013

Solenergi - en självskriven del i framtidens lågenergibyggnader

Åsa Wahlström, Catrin Heincke, Jan-Olof Dalenbäck et al
Energimagasinet (7/2013), p. 36-37
Journal article - popular science
2013

Det är skillnad på skatt och skatt

Jan-Olof Dalenbäck,
Energimagasinet (5/2013), p. 40-41
Journal article - popular science
2013

Nettodebitering stärker elkunderna!

Jan-Olof Dalenbäck,
Energimagasinet (2/2013), p. 26
Journal article - popular science
2013

Någon gång ska väl poletten ramla ner

Jan-Olof Dalenbäck,
Energimagasinet (1/2013), p. 34-35
Journal article - popular science
2013

An emerging option: Grid-Connected Solar Heat

Jan-Olof Dalenbäck,
EuroHeat&Power. Vol. 10 (IV), p. 30-33
Journal/newspaper article
2013

Solar District Heating and Cooling

Jan-Olof Dalenbäck,
EuroHeat&Power. Vol. Volum 10 (III/2013), p. 26-29
Journal article - popular science
2013

Model-based controllers for indoor climate control in office buildings - Complexity and performance evaluation

Mattias Gruber, Anders Trüschel, Jan-Olof Dalenbäck et al
Energy and Buildings. Vol. 68, p. 213-222
Scientific journal article - peer reviewed
2012

Malört i glädjebägaren

Jan-Olof Dalenbäck,
Energimagasinet (5/2012)
Journal article - popular science
2012

Sverige på efterkälke

Jan-Olof Dalenbäck,
Energimagasinet (2/2012), p. 36-37
Journal article - popular science
2012

Teknikplattform bildad för förnybar energi, värme och kyla

Jan-Olof Dalenbäck,
Energimagasinet (5/2012), p. 48-50
Journal article - popular science
2012

Mer solvärme i danska fjärrvärmesystem

Jan-Olof Dalenbäck,
Energimagasinet (6/2012), p. 42-46
Journal article - popular science
2012

Ny stadsdel med 40 procent solenergi i Kungsbacka

Jan-Olof Dalenbäck,
Energimagasinet (5/2012), p. 44-45
Journal article - popular science
2012

Mer solenergi med nära-noll-energihus?

Jan-Olof Dalenbäck,
Energimagasinet (7/2012), p. 37-39
Journal/newspaper article
2012

Thermal and mechanical performance of sealed, gas-filled, flat plate solar collectors

Johan Vestlund, Jan-Olof Dalenbäck, Mats Rönnelid et al
Solar Energy. Vol. 86 (1), p. 13-25
Scientific journal article - peer reviewed
2011

MILPARENA - Temamöten och Pilotprojekt inom CERBOF

Jan-Olof Dalenbäck,
Report
2011

Movement and mechanical stresses in sealed, flat plate solar collectors

Johan Vestlund, Jan-Olof Dalenbäck, Mats Rönnelid et al
Solar Energy. Vol. 86 (1), p. 339-350
Scientific journal article - peer reviewed
2011

Förnybar energi ökade 60 procent på tre år

Jan-Olof Dalenbäck, Lars Andrén, Andrew Machirant et al
Energimagasinet (5-2011)
Journal/newspaper article
2011

Förväntansfullt årsmöte i Svensk Solenergi

Jan-Olof Dalenbäck,
Energimagasinet (3-2011)
Journal/newspaper article
2011

Milparena – A Network Project for Knowledge Enhancement Regarding Energy Renovation of Multi-family Buildings in Sweden

Jan-Olof Dalenbäck, Kristina Norling Mjörnell,
Proceedings Ökosan 2011
Conference paper - non peer reviewed
2011

Wood pellet and solar heating system development in Sweden - Initial result from system bench-marking test developments

Jan-Olof Dalenbäck, Ulrik Pettersson, Tomas Persson et al
Proceedings estec 2011
Conference paper - non peer reviewed
2010

Varför ställa solceller mot energieffektivisering

Jan-Olof Dalenbäck,
energi&miljö (4/2010)
Journal/newspaper article
2010

Möjligt med allt förnybart till 2050

Jan-Olof Dalenbäck,
Energimagasinet (7/2010)
Journal/newspaper article
2010

Boom för solvärme i danska fjärrvärmesystem

Jan-Olof Dalenbäck,
Energimagasinet (6/2010)
Journal/newspaper article
2010

Utveckling med förhinder

L Andrén, Jan-Olof Dalenbäck, Andrew Machirant et al
Energimagasinet (2/2010)
Journal/newspaper article
2010

Gemensam syn behövs för bättre verkningsgrad

L Andrén, Jan-Olof Dalenbäck, Andrew Machirant et al
Energimagasinet (1/2010)
Journal/newspaper article
2010

STUDIES OF GAS-FILLED FLAT PLATE SOLAR COLLECTORS

Johan Vestlund, Jan-Olof Dalenbäck, M Rönnelid et al
Proceedings Eurosun 2010
Conference paper - non peer reviewed
2009

Energieffektiv bebyggelse och fjärrvärme i framtiden

Ingrid Nyström, Martin Erlandsson, Torbjörn Lindholm et al
Report
2009

Thermal performance of gas-filled flat plate solar collectors

Johan Vestlund, M Rönnelid, Jan-Olof Dalenbäck et al
Solar Energy. Vol. 83 (6), p. 896-904
Scientific journal article - peer reviewed
2009

Nationellt mål behövs för solenergi

Lars Andrén, Andrew Machirant, Jan-Olof Dalenbäck et al
Energimagasinet (7/09)
Journal/newspaper article
2009

Ett toppår för förnybar energi

Jan-Olof Dalenbäck,
Energimagasinet (4)
Journal/newspaper article
2009

Swedish Solar Thermal Market Development: Results and experiences up to 2008

Jan-Olof Dalenbäck,
European Solar Thermal Energy Conference, Munchen
Conference paper - non peer reviewed
2008

Prognosstyrning - Ser inte skogen för alla träd

Jan-Olof Dalenbäck,
Energi&Miljö. Vol. 79 (11), p. 65
Scientific journal article - non peer reviewed
2008

Is there a role for district heating in future cities with low energy buildings?

Morgan Fröling, Charlotte Reidhav, Jan-Olof Dalenbäck et al
11th International Symposium on District Heating and Cooling, August 31 to September 2, 2008, Reykjavik, ICELAND
Conference paper - non peer reviewed
2008

Movements and mechanical stresses in gas-filled flat plate solar collectors

Johan Vestlund, Mats Rönnelid, Jan-Olof Dalenbäck et al
Proceedings Eurosun 2008
Conference paper - non peer reviewed
2008

Harnessing Solar for District Energy: Europe leading the way

Jan-Olof Dalenbäck,
District Energy. Vol. 94 (4), p. 11-15
Scientific journal article - non peer reviewed
2008

Prospects to reduce the use of energy by 50% in existing office buildings

Jan-Olof Dalenbäck, Enno Abel,
Proceedings ICEBO 2008
Conference paper - non peer reviewed
2008

Prospects for Solar District Heating in Europe

Jan-Olof Dalenbäck,
Proceedings SOLPOL 2008
Conference paper - non peer reviewed
2007

Solar District Heating and Cooling

Jan-Olof Dalenbäck,
EuroHeat&Power (IV/2007), p. 26-29
Journal article - popular science
2007

Application and Design of Large-scale Solar Heating Systems in Europe

Jan-Olof Dalenbäck, Yo Gouqing,
Journal of Heating Ventilating & Air Conditioning. Vol. 4, p. 117-120
Journal article - popular science
2007

Thermal Losses in Sealed, Gas-filled Flat Plate Solar Collectors

Johan Vestlund, Jan-Olof Dalenbäck, Mats Rönnelid et al
ISES Solar World Congress 2007 Proceedings
Conference paper - non peer reviewed
2007

Large-scale Solar Heating and Cooling Systems in Europe

Jan-Olof Dalenbäck,
ISES Solar World Congress 2007 Proceedings
Conference paper - non peer reviewed
2007

Prospects for Large-Scale Solar Heating Systems in Europe

Jan-Olof Dalenbäck, Dirk Mangold,
estec 2007 Proceedings, p. 243-249
Conference paper - non peer reviewed
2007

European Solar Thermal Technology Platform

Jan-Olof Dalenbäck,
NorthSun 2007 Conference Proceedings
Conference paper - non peer reviewed
2007

Fjärrvärmens roll i ett samhälle med energieffektiv bebyggelse

Morgan Fröling, Jan-Olof Dalenbäck, Charlotte Reidhav et al
Report
2006

Energi- och elanvändning i byggnader

Jan-Olof Dalenbäck, Lennart Jagemar, Anders Göransson et al
Report
2006

Tjugo missade år - Ställ krav på befintliga hus !

Jan-Olof Dalenbäck,
VVS Teknik&Installation (Temanummer om Energieffektivisering, oktober 2006)
Journal/newspaper article
2006

Solar buildings in Gardsten - A holistic approach including roof module collectors

Jan-Olof Dalenbäck,
Proceedings Solar 2006, September 2006, Gleisdorf, Austria.
Conference paper - non peer reviewed
2006

Solar Thermal Market Development in Europe

Jan-Olof Dalenbäck,
Proceedings ICORE 2006, February 2006, Hyderabad, India.
Conference paper - non peer reviewed
2006

Bestående renovering av bostadsområde i Göteborg.

Jan-Olof Dalenbäck,
Energi & Miljö, Nr 1, 2006.
Journal/newspaper article
2006

Solar heating using roof module collectors - Examples from new and existing building areas

Jan-Olof Dalenbäck,
Polska Energetyka Sloneczna, Nr 1-2/2006, May 2006, ISES Poland.
Scientific journal article - non peer reviewed
2006

Preliminary Analysis of a Solar Heat Pump System with Seasonal Storage

Guoqing Yu, Peng Chen, Jan-Olof Dalenbäck et al
International Conference for Enhanced Building Operations, November 2006, Shenzhen, China
Scientific journal article - peer reviewed
2005

Åtgärder för ökad energieffektivsering i bebyggelse

Jan-Olof Dalenbäck, Anders Göransson, Lennart Jagemar et al
Report
2005

Solar Energy Association of Sweden ? SEAS

Jan-Olof Dalenbäck,
Report
2005

Dags att ta förnybar energi på allvar

Jan-Olof Dalenbäck,
Energimagasinet (1)
Journal article - popular science
2005

Ny energiteknik växer snabbt globalt

Jan-Olof Dalenbäck,
Energimagasinet (2)
Journal article - popular science
2005

Renovering av flerbostadshus-Gårdsten

Jan-Olof Dalenbäck,
Energi och bebyggelse
Journal article - popular science
2005

Solar heating ? Swedish Experience ? Large-scale Solar Heating

Jan-Olof Dalenbäck,
Escalfar Aigua Amd El Sol
Conference paper - non peer reviewed
2005

Solar Thermal Market Development in Europe

Jan-Olof Dalenbäck,
Northsun 2005
Conference paper - non peer reviewed
2005

Solar Thermal Market Development in Europe

Jan-Olof Dalenbäck,
ISES SWC 2005
Conference paper - non peer reviewed
2005

Solvärmeteknikens status och möjligheter till ökat genomslag

Jan-Olof Dalenbäck,
Sveriges Energiting
Conference paper - non peer reviewed
2005

Hållbar upprustning - Exemplifierat med Gårdsten

Jan-Olof Dalenbäck,
IEH-seminariet ?Hållbar stadsutveckling?
Conference paper - non peer reviewed
2005

Solvärme - En svensk exportframgång ? Solvärme och solel i ett internationellt perspektiv

Jan-Olof Dalenbäck,
Miljöpartiets energiseminarium
Conference paper - non peer reviewed
2005

Sänkta driftkostnader betalar merkostnader i Solhus. Bakgrund ? Åtgärder - Resultat

Jan-Olof Dalenbäck,
Bo i Göteborg ? utställningen
Conference paper - non peer reviewed
2005

Erfarenheter från energieffektivisering i ett miljonprogramsområde

Jan-Olof Dalenbäck,
Effektiv energistyrning
Conference paper - non peer reviewed
2005

Swedish Solar Thermal Market Deve¬lopment with Investment Support based on Collector Output: Description, Results and Experiences up to 2004

Jan-Olof Dalenbäck, P Kovacs,
Proceedings estec2005
Conference paper - non peer reviewed
2005

Solar heated residential area Anneberg - Initial evaluation

M Lundh, Jan-Olof Dalenbäck,
Journal of applied research, Official journal of Lithuanian applied science academy (2), p. 142-152
Scientific journal article - non peer reviewed
2005

Solar heated residential area Anneberg - Initial evaluation

M Lundh, Jan-Olof Dalenbäck,
Proceedings Northsun 2005, The 10th International Conference on Solar Energy in High Latitudes, May 25 - 27, 2005 Vilnius, Lithuania
Conference paper - peer reviewed
2005

Solar renovation project Gårdsten, Göteborg - Operational experiences 2001-2004

Vitalijus Pavlovas, Jan-Olof Dalenbäck,
The 10th International Conference on Solar Energy in High Latitudes,Vilnius,Lithuania
Scientific journal article - non peer reviewed
2002

Large-scale Solar Heating in Europe

Jan-Olof Dalenbäck,
Proceedings Solar 2002
Conference paper - peer reviewed
2001

Swedish SDHW System Procurement Competition-Description and Experiences

Jan-Olof Dalenbäck, Peter Kovacs,
Proceedings of Northsun 2001, Leiden, Holland
Conference paper - peer reviewed
2001

Solar Renovation Project Gårdsten, Göteborg-Evaluation Results

Jan-Olof Dalenbäck, Christer Nordström,
Proceedings Northsun 2001, Leiden, Holland
Conference paper - peer reviewed