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.
Designs,
Год журнала:
2023,
Номер
7(4), С. 89 - 89
Опубликована: Июль 4, 2023
To
investigate
the
performance
of
transcritical
CO2
quasi-secondary
compression
cycle
with
ejector
(TCIEJ)
for
heat
pump
water
heaters,
thermodynamic
model
TCIEJ
is
established
based
on
pinch
point,
and
TCEX,
TCEJ,
TCI
are
selected
as
comparisons.
The
effects
changing
high
pressure
ambient
temperature
heating
COP
compressor
exhaust
analyzed,
influence
cooling
inlet
outlet
vapor
injection
further
analyzed.
results
show
that
there
optimal
pressures
make
four
cycles
reach
maximum
value,
which
has
best
performance.
At
an
−15
°C,
increased
by
about
20.5%,
14.9%,
7.9%
compared
TCI.
With
increase
in
temperature,
continues
to
increase,
corresponding
gradually
increases.
Selecting
geometric
mean
evaporation
TCIEJ,
error
small
actual
pressure.
correlation
formula
fitted
according
simulation
results.
Science and Technology for the Built Environment,
Год журнала:
2023,
Номер
29(5), С. 523 - 532
Опубликована: Март 21, 2023
Net-zero
energy
buildings
are
on
the
agenda
of
international
community
due
to
reduced
consumption
in
buildings,
which
turn
lowers
carbon
emissions
and
negative
environmental
effects.
One
ways
reach
net
zero
is
utilize
heat
pumps
decrease
their
consumption.
In
this
study,
idea
ejector
utilization
a
pump
system
was
investigated
an
experimental
test
facility
by
comparison
conventional
(without
ejector).
The
facility,
utilizes
hot
cold
water
as
source,
can
operate
two
modes:
heater
(EHP-WH)
(HP-WH).
tested
transient
conditions
effect
determined.
Results
indicate
that
EHP-WH
mode
(coefficient
performance
[COP]
between
5
6)
had
COP
value
average
5.5%
higher
than
for
HP-WH
(COP
4.5
5.5).
Furthermore,
heating
capacity
obtained
30%
HP-WH.
Additionally,
cooler
loop's
temperature
64.5%
mode.
Finally,
it
determined
positively
impacts
te
system.
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.
