34th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems (ECOS 2021),
Год журнала:
2023,
Номер
unknown, С. 884 - 895
Опубликована: Янв. 1, 2023
Steam
generating
heat
pumps
show
great
potential
for
reducing
carbon
emissions
in
the
industrial
sector.However,
predicting
their
performance
is
challenging
as
exergy
destruction
of
e.g.,
compressors
and
expansion
valves
increases
with
temperature
lift
condenser
temperature.With
over
seventy
design
improvements
mentioned
literature,
selecting
most
effective
crucial.In
this
study,
energy
exergy-based
methods
were
compared
ability
to
identify
a
single
stage
subcritical
pump
produce
steam
from
hot
condensate.The
energy-based
method
suggested
addition
sequential
compressor
an
intermediate
cooler;
however,
did
not
improve
pump's
techno-economic
performance.The
suggestion
adding
either
internal
exchanger
or
flash
vessel
by
lead
both
cases
improved
performed
best
increased
coefficient
2.3
2.8
reduced
operational
costs
0.8
M€
after
5
years
operation.Additionally,
initial
investment
decreased
135
k€,
total
operation
10.3
8.7
M€.These
findings
that
are
way
forward
identifying
pumps.
Thermal Science and Engineering Progress,
Год журнала:
2024,
Номер
51, С. 102603 - 102603
Опубликована: Май 8, 2024
The
development
of
high
temperature
heat
pumps
for
waste
recovery
benefits
industrial
processes
by
meeting
demand,
increasing
energy
efficiency,
and
reducing
emissions.
aim
such
systems
is
to
upgrade
streams,
typically
around
50
°C
100
°C,
higher
temperatures
ranging
from
200
°C.
A
primary
challenge
in
getting
the
required
compression
system.
There
a
plethora
recently
published
research
papers
including
reviews
that
address
pumps.
However,
there
has
been
no
comprehensive
review
addressing
systems,
despite
their
major
influence
successful
pumps;
this
paper
provides
compressors.
Firstly,
an
overview
pump
provided,
which
covers
cycle
arrangements
working
fluid
selection.
This
followed
different
compressor
technologies
used,
relevant
modelling
design
tools.
Finally,
suggestions
future
directions
compressors
are
provided.
It
was
found
screw
have
obvious
choice
due
experience
gained
refrigeration
industry.
they
can
handle
constrained
maximum
possible
limitation
avoid
oil
degradation.
For
temperatures,
better
larger
capacity,
it
seems
alternative
turbo-compressors.
Nevertheless,
lack
area
more
efforts
enable
these
machines
achieve
potential
Energies,
Год журнала:
2024,
Номер
17(16), С. 4043 - 4043
Опубликована: Авг. 15, 2024
The
incorporation
of
ejectors
into
heat
pump
and
refrigeration
cycles
has
been
the
subject
growing
interest,
largely
due
to
their
simple
structure,
high
reliability,
cost-effectiveness.
This
paper
investigates
recent
advancements
in
novel
design
concepts
ejector-enhanced
vapor
compression
cycles.
An
overview
single-stage
two-stage
utilizing
a
single
or
multiple
is
provided.
First,
system
setup,
operational
principles,
description,
figures
existing
schemes
are
Second,
main
results,
such
as
coefficient
performance
(COP),
volumetric
heating
capacity
exergy
destruction,
discussed.
In
conclusion,
presents
coherent
summary
current
developments,
future
prospects,
knowledge
gap.
A
plethora
research
present
developing
theoretical
systems
with
efficiency.
However,
experimental
tests
for
real-life
implementations
limited.
review
aims
provide
reader
an
studies.
