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Our group is engaged in a wide range of research work. This covers modeling and experimental investigations of both fundamental and industrial problems of thermal energy and bioenergy. Main focus:

  • Biomass characterization, treatment, and applications.
  • Biochar for metallurgical applications
  • Hydrothermal liquefaction for bio-oil production
  • Process modeling and CFD modeling 
  • Green heat applications: Geothermal Heat pump, wood/pellet, or solar heating system. 
  • Energy efficiency, indoor climate, and sustainability of buildings


Current projects:

  • Two-phase CO2 cooling system for the CMS Detector at CERN.
  • Bubbling fluidized bed gasification with University of South-Eastern Norway


Ongoing phd-projects:

  • Madhawa Jayathilake: Hydrothermal Co-liquefaction of Fish Residues and Macroalgae
  • Taimur Akhtar: Process modelling for hydrothermal liquefaction of biomass
  • Nils Randulf Kristiansen: Elektrisitetsproduksjon fra spillvarme på skip
  • Haidar Hosamo: A BIM and IoT integration in support of decision making for optimizing building performance and energy management
  • Javad Darvishi: Indoor Climate and  Cross Laminated Timber (CLT)



Previous projects

  • Biomass characterization with University College of Southeast Norway (2013-2015)
  • Measurement techniques for combustible gases with University College of Southeast Norway (2013-2015)
  • Moisture and ash in short rotation coppice willow with Aarhus university (2011-2015)
  • CO2 capture using algae with Elkem, NIVA (2012-2016)
  • Production of energy crops, 3000 m² with willow, reed canary grass, Mischanthus giganteus, poplar and sorrel (2002-2012)
  • CHP and energy saving with Alloc (2010)
  • Biomass and bioenergy for regional research funds – The Research Council of Norway (2010-2011)

Planned projects

  • Optimization and operation of bubbling fluidized bed gasifier for production of liquid fuels from biomass with University college of Southeast Norway. The Research Council of Norway.
  • Recycling manure, Eurostars application with Interaktivt MedieCenter ApS, Waterment AS and University College of Southeast Norway
  • Biomass Energy Generation with Improved efficieNcy, flexibility and Safety, Horizon2020 - Innovative Training Network application with 22 partners from 8 countries
  • Forbehandling og termisk forgasning af spildevandsslam – Afdækning af miljø-, ressource-, forretnings- og energimæssige forhold, søknad til Miljøteknologisk Udviklings- og Demonstrationprogram, Danmark. Hovedsøker er VIA University College. 
  • Sikker slutkvalitet for træbaserede energiprodukter -  Samspil mellem slutkvalitet og variation i kemiske og fysiske egenskaber i træer og mellem træer, EnergiX (partnere søges).

Research partners

  • Professor Lasse Rosendahl and Assistant Professor Saqib Toor, Department of energy technology, Aalborg university, Denmark
  • Professor Matthias Ahlhaus, Fachhochschule Stralsund – University of applied sciences, Germany
  • Senior researcher Poul Erik Lærke and senior researcher Uffe Jørgensen, Department of Agroecology - Climate and Water, Aarhus university, Denmark
  • Associate Professor DR.IR. D.W.F. Brilman (Wim), University of Twente, Enschede, The Netherlands.

Selected publications

Riva, Lorenzo; Wang, Liang; Ravenni, Giulia; Bartocci, Pietro; Videm Buø, Therese; Skreiberg, Øyvind; Fantozzi, Francesco; Nielsen, Henrik Kofoed (2021). Considerations on factors affecting biocarbon densification behavior based on a multiparameter model. Energy. ISSN: 0360-5442. doi:10.1016/j.energy.2021.119893.

Jayathilake, Madhawa; Rudra, Souman; Rosendahl, Lasse A. (2020). Hydrothermal liquefaction of wood using a modified multistage shrinking-core model. Fuel. ISSN: 0016-2361. doi:10.1016/j.fuel.2020.118616.

Rudra, Souman; Tesfagaber, Yohannes Kifle (2019). Future district heating plant integrated with municipal solid waste (MSW) gasification for hydrogen production. Energy. ISSN: 0360-5442. 180s 881 - 892. doi:10.1016/j.energy.2019.05.125.

Riva, Lorenzo; Surup, Gerrit Ralf; Buø, Therese Videm; Nielsen, Henrik Kofoed (2019). A study of densified biochar as carbon source in the silicon and ferrosilicon production. Energy. ISSN: 0360-5442. 181s 985 - 996. doi:10.1016/j.energy.2019.06.013.

Riva, Lorenzo; Nielsen, Henrik Kofoed; Skreiberg, Øyvind; Wang, Liang; Bartocci, Pietro; Barbanera, Marco; Bidini, Gianni; Fantozzi, Francesco (2019). Analysis of optimal temperature, pressure and binder quantity for the production of biocarbon pellet to be used as a substitute for coke. Applied Energy. ISSN: 0306-2619. 256s 1 - 16. doi:10.1016/j.apenergy.2019.113933.

Surup, Gerrit Ralf Nielsen, Henrik Kofoed Heidelmann, Markus Trubetskaya, Anna (2018). Characterization and reactivity of charcoal from high temperature pyrolysis (800–1600 °C). Fuel. ISSN: 0016-2361. 235s 1544 - 1554. doi:https://doi.org/10.1016/j.fuel.2018.08.092

Surup, Gerrit Ralf Vehus, Tore Eidem, Per-Anders Trubetskaya, Anna Nielsen, Henrik Kofoed (2019). Characterization of renewable reductants and charcoal-based pellets for the use in ferroalloy industries. Energy. ISSN: 0360-5442. 167s 337 - 345. doi:https://doi.org/10.1016/j.energy.2018.10.193

Surup, Gerrit Ralf Foppe, Manuel Schubert, Daniel Deike, Rüdiger Heidelmann, Markus Timko, Michael T. Trubetskaya, Anna (2018). The effect of feedstock origin and temperature on the structure and reactivity of char from pyrolysis at 1300–2800 °C. Fuel. ISSN: 0016-2361. 235s 306 - 316. doi:https://doi.org/10.1016/j.fuel.2018.07.093

Jayathilake, Rukshan Rudra, Souman (2017). Numerical and Experimental Investigation of Equivalence Ratio (ER) and Feedstock Particle Size on Birchwood Gasification. Energies. ISSN: 1996-1073. doi:10.3390/en10081232.

Rudra Souman, Rosendahl Lasse, Techno-economic analysis of a local district heating plant under fuel flexibility and performance (2016). Energy Efficiency ISSN 1570-646X. s - doi: 10.1007/s12053-016-9475-2

Sarker Shiplu, Thermochemical gasification of local lignocellulosic biomass via fixed-bed and fluidized-bed reactors (2016). Doctoral dissertations at University of Agder;131. AURA: http://hdl.handle.net/11250/2390851

Sarker Shiplu, Nielsen Henrik Kofoed, Preliminary fixed-bed downdraft gasification of birch woodchips (2015). International Journal of Environmental Science and Technology . ISSN 1735-1472. 12 (7), s 2119 - 2126 doi: 10.1007/s13762-014-0618-8

Sarker Shiplu, Nielsen Henrik Kofoed, Assessing the gasification potential of five woodchips species by employing a lab-scale fixed-bed downdraft reactor (2015). Energy Conversion and Management ISSN 0196-8904. 103 s 801 - 813 doi: 10.1016/j.enconman.2015.07.022

Sarker Shiplu, Arauzo Jesus, Nielsen Henrik Kofoed, Semi-continuous feeding and gasification of alfalfa and wheat straw pellets in a lab-scale fluidized bed reactor (2015). Energy Conversion and Management ISSN 0196-8904. 99 s 50 - 61 doi: 10.1016/j.enconman.2015.04.015

Nielsen Henrik Kofoed, Lærke Poul Erik, Liu Na, Jørgensen Uffe, Sampling procedure in a willow plantation for estimation of moisture content (2015).Biomass & Bioenergy ISSN 0961-9534. 78 s 62 - 70 doi:10.1016/j.biombioe.2015.03.028

Sarker Shiplu, Bimbela Fernando, Sanchez Jose Luis, Nielsen Henrik Kofoed, Characterization and pilot scale fluidized bed gasification of herbaceous biomass: A case study on alfalfa pellets (2015). Energy Conversion and Management ISSN 0196-8904. 91 s 451 - 458 doi:10.1016/j.enconman.2014.12.034

Rudra Souman Process analysis of a biomass-based quad-generation plant for combined power, heat, cooling, and synthetic natural gas production (2015). Energy Conversion and Management ISSN 0196-8904. 106 s 1276 - 1285 doi: 10.1016/j.enconman.2015.10.072

Liu Na, Nielsen Henrik Kofoed, Jørgensen Uffe, Lærke Poul Erik, Sampling procedure in a willow plantation for chemical elements important for biomass combustion quality (2014). Fuel ISSN 0016-2361. (142), s 283 - 288 doi: doi:10.1016/j.fuel.2014.11.020

Sarker Shiplu, Nielsen Henrik Kofoed, Preliminary fixed-bed downdraft gasification of birch wood chips (2104). International Journal of Environmental Science and Technology . ISSN 1735-1472. (june), s - doi: 10.1007/s13762-014-0618-8

Horn Svein Jarle, Estevez Maria Magdalena, Nielsen Henrik Kofoed, Linjordet Roar, Eijsink Vincent, Biogas production and saccharification of Salix pretreated at different steam explosion conditions (2011).Bioresource Technology ISSN 0960-8524. 102 (17), s 7932 - 7936 doi: 10.1016/j.biortech.2011.06.042

Sarker Shiplu, Møller Henrik Bjarne, Bruhn Annette, Influence of variable feeding on mesophilic and thermophilic co-digestion of Laminaria digitata and cattle manure (2014). Energy Conversion and Management ISSN 0196-8904. 87 s 513 - 520 doi:10.1016/j.enconman.2014.07.039

Sarker Shiplu, Møller Henrik Bjarne, Regulating feeding and increasing methane yield from co-digestion of C5 molasses and cattle manure (2014). Energy Conversion and Management ISSN 0196-8904. 84 s 7 - 12 doi: 10.1016/j.enconman.2014.03.082

Sarker Shiplu, Møller Henrik Bjarne, Boosting biogas yield of anaerobic digesters by utilizing concentrated molasses from 2nd generation bioethanol plant (2013). The International Journal of Energy and Environment ISSN 2076-2895. 4 (2), s 199 - 210

Rudra Souman, Rosendahl Lasse, Kumar Amit, Development of net energy ratio and emission factor for quad-generation pathways (2014). Energy Systems, Springer Verlag ISSN 1868-3967. doi:10.1007/s12667-014-0126-4

Rudra Souman, Rosendahl Lasse, Hoffmann Jessica, Conceptual design of an integrated hydrothermal liquefaction and biogas plant for sustainable bioenergy production (2013). Bioresource Technology ISSN 0960-8524. doi: 10.1016/j.biortech.2012.11.051

Research facilities

Analytical instruments: 

  • Heating Microscope, 1750 °C , Hesse Instruments HR18
  • Online producer gas analysis CO, CO2, CH4, H2, O2, ABB Advance Optima AO2000
  • Portable chilled mirror hygrometer for determination of dew point, Omega RHB-1500-C
  • Gas chromatograph, Varian
  • Micro gas chromatograph, Varian
  • Adiabatic bomb calorimeter for measuring the calorific value, Sanyo Gallenkamp
  • Elemental analyzer C, H and N, PerkinElmer 2400 Series II System
  • Thermogravimetric analyzer (TGA).  Mettler Toledo TGA/DSC1
  • Heated muffle furnace for measuring the ash content, 1100 °C, Nabertherm LT 40/11/330
  • Drying oven for measurement of moisture content, Termaks
  • Flue gas analysis CO, O2, flue gas temperature and draught, Testo 327-1
  • Measurement of moisture content by means of conductivity, Testo 606-1
  • Measurement of moisture content capacitive, Testo 635-1
  • 2 food calorimeters for teaching, from skolebutik.dk
  • Thermocouples for measuring flue gas temperature etc. with Digitron 2029T
  • 3 pallet scales 1500 kg, Scaleit FM pallet scale
  • Scales 

Laboratory equipment:

  • Hydrothermal Liquefaction Rig for biofuel production. Keison (SBL-2D) sand bath, High-pressure reactors(24ml, 65ml)
  • Biofuel boiler for firewood, wood pellets, grain, and wood chips. CN25 boiler assembled with CN250 stoker with oxygen control and a 250 litre fuel hopper. Manufactured by CN maskinfabrik A/S
  • Wood pellet stove, 6 kW Wodtke Smart, with electric ignition, hopper capacity 25 kg. Manufactured by Wodtke
  • Fireplace, 2.5 meters wide, for testing include biomass cooking stoves for developing regions
  • Dryer for wood and straw
  • Briquette press, 45 mm briquettes. Comafer Mythos
  • Hammer Mill, ARP-Safe Model 100 (located in room C1 100)
  • Gas and oil furnaces, 100 kW, for teaching, with see-through glass and adjustable fuel and air nozzles. Older model from the company P.A. Hilton Engineers Ltd. (located in room C1 100)
  • A Calibrated Hotbox for Testing Window Systems etc. Determination of heat transmission (U-value)
  • Complete heat pump system with heat emitters
  • Blower door for determination of airtightness of buildings
  • Photobioreactor system for algae production
  • Solar thermal collector located at ROOFTOP ENERGY TEST PLATFORM


Members in the group

Associate members

  • Britt Margrethe Emilie Moldestad, professor, University of South-Eastern Norway
  • Lars-André Tokheim, associate professor, University of South-Eastern Norway
  • Rune Bakke, professor, University of South-Eastern Norway
  • Marianne Sørflaten Eikeland, associate professor, University of South-Eastern Norway

Former employees:

  • Magne Våge, Associate Professor
  • Paul Arentzen, Associate Professor
  • Turid Knutsen, Associate Professor
  • Shiplu Sarker, PhD Research Fellow
  • Gerrit Ralf Surup, PhD Research Fellow
  • Taimur Akhter, PhD Research Fellow
  • Lorenzo Riva, PhD Research Fellow