The Department of Energy
Technology is organized in a number of divisions and centers. The
activities are supervised by a board with members from faculty, industry
and students. The staff consists of 4 professors, about 20 senior researchers,
about 40 PhD students and 20 other staff. The department is a partner
in the CETET center at KTH.
At the department an International Masters of Science Program in Sustainable
Energy Engineering is offered. More
details on the course in english medium, which has been very popular
among students from developing countries including South Asia
during the five years it has been running.
Research fields at the Division
In the Division of Applied Thermodynamics and Refrigeration
emphasis is put on education and research on environment friendly energy
transformation. The research is directed towards thermodynamic properties
of media, heat transfer, studies of components and systems for heat pump,
refrigeration and cooling. Well-equipped laboratories and access to powerful
computers provide the foundation for activities which are on a high level,
and, which are recognized as such, internationally. Because of the excellence
of our educational program, a number of projects are carried out in collaboration
with, and with support from, industry and research organizations, within
internationally. The main fields of research can be divided into the following
Thermodynamic cycles in general, with special interest in applications
for heat pumps and refrigeration engineering.
Working media, practical as well as theoretical studies of "new"
refrigerants as replacements to CFC- and HCFC-type media (so called
Freons). The area also includes secondary refrigerants for
Heat transfer correlations and techniques for heat exchange.
Theoretical and practical developments especially for applications to
boiling and condensing media, compact heat exchangers and for cooling
of electronic components using different approaches.
Components and systems for heat pumps and refrigeration. Experiences
obtained in converting systems and components to use new, environmental
friendly refrigerants, including the use of mixtures and naturalsubstances.
Ongoing research connected to South Asia
defended his Licentiate thesis on ”Boiling
of refrigerants on enhanced surfaces and boiling of nanofluids”
in May 2003. More
information, with link to the full thesis.
Witharana, hailing from Gampaha, 50 km away from Colombo, Sri Lanka, graduated
from the University of Moratuwa as an Engineer in 1997, and went to KTH
Sweden for Post Graduate studies. He completed his M.Sc. in 1999. His
research deals with Energy Technoogy, emphasising on efficient useage
of energy, looking at prospects of improving the energy efficiency of
heat transfer systems in a broader basis. Mathematically, if we achieve
a better efficiency in an energy consumtion system, in turn, we will be
get the benefit of lower power input to that system. for an example, a
household refrigerator consumes 100 Watts of electric power to keep our
food stuff cold. If it is possible to improve the efficiency of this refrigerator
by 20 p.c., we can cool our food stuff by consuming only 80 Watts. That
means the electricity bill will be eased, less burning of fossil fuels,
and less number of nuclear plants etc. Witharana is aiming at improving
the energy efficiency of power consuming apparatus, with special focus
put on Sri Lanka.
Witharana is now back in Sri Lanka.