The expansion process in refrigeration systems may
theoretically provide work using a liquid to two-phase expander; however, the
flashing during expansion complicates the design due to fatigue. Another
approach to exploit the possible work (or kinetic energy) during expansion is
to use an ejector. The ejector works as the expansion device in the
refrigeration system and provides a pressure lift and thus a lower compressor
work compared to conventional systems. A flooded type evaporator may also be
used thereby increasing the evaporation temperature.
The project aims on evaluating the feasibility of the
usage of ejectors, especially related to CO2 refrigeration cycles, in which
pressure differences are high between the gas-cooler and evaporator. The
project may be either numerical (e.g. 1D modeling or 3D (CFD) simulation of the
ejector, or 0D system modeling) or experimental. A small scale CO2 system with
an ejector is being build in the lab for testing.
Please contact Martin Ryhl Kærn (firstname.lastname@example.org) or Wiebke Brix Markussen
(email@example.com) for further information. According to the personal preferences
of the candidate, topic and extend of the work can be adjusted.
Project identifier: MEKTES, MEKTESREF, MEKTESHTF, MEKTESTPF.