Enhancing thermal efficiency of double-pass solar air collectors: A comparative study on the role of V-angled perforated fins
Energy Reports,
Год журнала:
2024,
Номер
12, С. 481 - 494
Опубликована: Июнь 24, 2024
Язык: Английский
Impact of straight slot impingement jets on heat transfer enhancement of TiO2/H2O nanofluid flow in a square channel: CFD analysis
Scientific Reports,
Год журнала:
2025,
Номер
15(1)
Опубликована: Март 5, 2025
This
study
presents
a
computational
fluid
dynamics
(CFD)
analysis
of
heat
transfer
and
pressure
drop
in
straight
slot
impingement
jet,
utilizing
$$\:\text{T}\text{i}{\text{O}}_{2}/{\text{H}}_{2}\text{O}$$
nanofluid
within
square
duct.
The
working
comprises
$$\:\text{T}\text{i}{\text{O}}_{2}$$
nanoparticles
(diameter
dp
=
25
nm)
suspended
water
at
volume
fraction
(ϕ)
2.5%.
investigation
different
values
Reynolds
numbers
(Re)
from
8,000
to
17,000,
with
variations
geometrical
parameters
such
as
jet
height
ratio
(
$$\:{\text{H}}_{\text{j}\text{e}\text{t}}/{\text{D}}_{\text{h}\text{d}}$$
:
0.3–0.6),
spanwise
pitch
$$\:{\text{P}}_{\text{s}\text{p}\text{a}\text{n}}/{\text{D}}_{\text{h}\text{d}}$$
0.18–0.45),
streamwise
$$\:{\text{P}}_{\text{s}\text{t}\text{r}\text{e}\text{a}\text{m}}/{\text{D}}_{\text{h}\text{d}}$$
0.88–1.30).
Three-dimensional
numerical
simulations
are
conducted
using
the
ANSYS
CFD
module,
incorporating
RNG
k-ε
turbulence
model
solve
governing
equations
turbulent
regime.
results
show
strong
agreement
both
experimental
empirical
correlations
similar
configurations
flow
conditions
for
plain-wall
deviations
around
6%
Nusselt
number
$$\:{\text{N}\text{u}}_{\text{j}\text{e}\text{t}}$$
)
3%
friction
factor
$$\:{\text{f}}_{\text{j}\text{e}\text{t}}$$
),
demonstrating
reliability
model.
exhibits
notable
enhancement
performance
compared
pure
water.
Variations
,
significantly
influence
optimal
configuration
0.5,
0.3,
0.97)
yielding
highest
across
most
numbers.
thermohydraulic
parameter
(THPP)
ranges
0.97
1.04,
reaching
its
peak
Re
0.97.
These
findings
highlight
potential
cooling
nanofluids
thermal
management
industrial
applications,
offering
enhanced
efficiency
through
direct
impact
on
target
surfaces.
Язык: Английский
Experimental investigation of shell and helical coiled heat exchanger with Al2O3 nano-fluid with wide range of particle concentration
Frontiers in Mechanical Engineering,
Год журнала:
2024,
Номер
10
Опубликована: Апрель 29, 2024
The
purpose
of
this
study
is
to
experimentally
enhance
the
heat
exchange
rate
shell
and
helical
coil
tube
exchanger
by
mixing
water
with
aluminum
oxide
(Al
2
O
3
)
nanoparticles,
as
well
explore
effect
inlet
thermal
parameters
on
performance
exchanger.
A
test
rig
was
constructed
investigate
influence
particle
concentration,
temperatures
nano-fluid.
Parameters
such
Nusselt
number,
pressure
drop,
evaluation
criteria
(PEC)
are
considered
nano-particle
In
a
wider
range
concentration
considered,
which
varies
from
0.0%–0.75%.
Experiments
without
nanoparticles
carried
out
under
identical
working
conditions.
By
analyzing
experimental
data,
it
found
that
significantly
improve
coefficient
transfer
inside
helically
coiled
tube.
From
sensitivity
analysis,
obseerved
there
slight
decrease
in
number
nano-fluid
increase
cooling
water.
Furthermore,
concluded
an
8.5%
PEC
value
observed
0.15%
0.75%.
Язык: Английский
Comprehensive energy and enviro-economic performance analysis of a flat plate solar water heater with a modified absorber
B Prabhu,
Elumalai Vengadesan,
S. Senthil
и другие.
Thermal Science and Engineering Progress,
Год журнала:
2024,
Номер
54, С. 102848 - 102848
Опубликована: Авг. 30, 2024
Язык: Английский
Employing RSM to model thermal performance and exergy destruction of LS-3 parabolic trough collector by coupling MCRT and CFD techniques
Case Studies in Thermal Engineering,
Год журнала:
2024,
Номер
58, С. 104396 - 104396
Опубликована: Апрель 16, 2024
This
study
investigates
the
thermal
performance
and
exergy
destruction
of
parabolic
trough
collector
by
Response
Surface
Methodology.
is
simulated
Monte
Carol
Ray
Tracing
method
results
are
coupled
to
Computational
Fluid
Dynamics.
Thermo-hydraulic
characteristics
thermodynamics
second
law
studied
with
turbulence-inducing
elements
hybrid
nanofluid.
The
absorber
tube
features
a
helical
profile
along
its
wall.
New
correlations
presented
describe
destruction,
modeling
output
shows
that
these
have
high
prediction
accuracy.
Methodology
also
show
turbulators
nonlinear
effect
on
while
Reynolds
number
has
destruction.
nanoparticles
carbon
nanotube
lead
an
increase
13%
10%
Nusselt
number,
respectively,
at
.
Also,
it
leads
decrease
7%
6.7%
respectively.
Increasing
working
fluid
flow
rate
from
12000
22000
improves
up
73%,
decreases
48%.
maximum
value
equal
2.1,
this
related
highest
including
elements.
Язык: Английский
Techno-economic analysis and optimization of 50 MWe linear fresnel reflector solar thermal power plant for different climatic conditions
Case Studies in Thermal Engineering,
Год журнала:
2024,
Номер
61, С. 104909 - 104909
Опубликована: Авг. 3, 2024
The
climate
change
crisis
is
primarily
associated
with
carbon
dioxide
emissions
from
fossil
fuel-based
electricity
generation,
which
significantly
contribute
to
the
greenhouse
gas
effect.
implementation
of
renewable
energy
technologies
can
mitigate
environmental
impacts
and
promote
a
sustainable
future.
This
study
aimed
conduct
techno-economic
feasibility
analysis
optimize
performance
parameters
for
50
MWe
capacity
Linear
Fresnel
Reflector
(LFR)
concentrated
solar
power
plant
nine
stations
under
various
climatic
conditions.
was
conducted
based
on
Levelized
Cost
Electricity
(LCOE)
Capacity
Factor
(CF)
select
suitable
Heat
Transfer
Fluid
(HTF)
each
station,
by
varying
Solar
Multiple
(SM)
1.0
6.0
adjusting
Thermal
Energy
Storage
(TES)
hours
four
sixteen.
HTFs
selected
economically
feasible
projects
at
different
were
Hitec
Salt,
Hitec,
Therminol
VP-1.
combination
SM
TES
optimized
economic
feasibility,
targeting
minimum
CF
36
%
maximum
LCOE
13.0
¢/kWh.
optimum
found
range
2.0
5.8
six
thirteen,
respectively.
An
less
than
7.5
¢/kWh
more
80
achieved
two
16
h
using
Stations
annual
mean
direct
normal
irradiance
values
higher
1500
kWh/m2
clearness
index
over
0.58
are
commercial
plants.
contributes
achieving
United
Nation's
development
goals
promoting
use
technologies.
Язык: Английский