1. SINTEF Energy Research, Postboks 4761, Torgarden, Trondheim, Norway
2. Department of Energy and Process Engineering, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway
3. Department of Chemical Engineering, Curtin University, GPO Box U1987, Perth, Western Australia 6845, Australia
4. Department of Engineering Sciences, University of Agder, P.O. Box 509, NO-4898 Grimstad, Norway