Journal of Renewable and Sustainable Energy,
Journal Year:
2024,
Volume and Issue:
16(6)
Published: Nov. 1, 2024
This
study
presents
a
substantial
enhancement
in
the
performance
of
solar
air
heaters
(SAH)
through
introduction
innovative
rotating
spiral-shaped
baffles
on
absorber
plate,
designed
to
optimize
airflow
within
duct
and
improve
heat
transfer.
The
results
underscore
critical
importance
fine-tuning
geometric
parameters,
including
relative
roughness
height
(e/H:
0.4–1)
pitch
(P/e:
4–10),
as
well
Reynolds
number
(Re:
4000–12
000),
achieve
superior
thermal
efficiency.
optimization
these
parameters
is
essential
for
maximizing
while
effectively
managing
flow
resistance
turbulence.
Experimental
testing,
conducted
under
simulator
(EN-12975-2
standard:
irradiance
uniformity
10.47%,
average
955
W/m2),
identified
configuration
P/e-8,
e/H-0.8,
Re-12000
optimal
combination.
setup
yielded
maximum
reduction
17.29%
plate
temperature
(Tp),
7.48%
increase
outlet
(To),
63.33%
augmentation
useful
gain
(Qu),
64.86%
improvement
efficiency
(η)
compared
smooth
duct.
These
findings
provide
key
insights
advancing
design
operational
SAH
systems.
A
field
evaluate
practical
applicability
this
modification
recommended
next
step
further
investigation.
Case Studies in Thermal Engineering,
Journal Year:
2024,
Volume and Issue:
59, P. 104570 - 104570
Published: May 21, 2024
In
this
current
experimental
study,
a
flat
absorber
plate
of
solar
air
heater
(SAH)
with
innovative
straight
interrupted
fins
arranged
in
V-shaped
pattern
is
analyzed
using
energy
and
exergy
approaches,
as
the
literature
clearly
shows
that
low
rate
heat
transfer
SAH
remains
source
concern
for
experts.
The
aluminum
finned
absorption
was
designed,
manufactured,
tested
during
summer
Saudi
Arabia,
examining
effect
changing
tilt
angle
θ=0º,
θ=10º,
θ=20º,
θ=30º.
study
found
tilting
at
θ=30º
increases
hot
exit
temperature
by
7.5%,
15.7%,
12.5%,
respectively,
compared
to
horizontal
position
θ=0º.
Tilting
θ=20º
increased
absorbed
radiation
draft,
resulting
38.2%
efficiency,
26.4%
1.36
sustainability
index
5.5%,
12.8%
3.8%
Abstract
This
study
presents
a
new
solar
receiver
that
incorporates
phase
change
material
(PCM)
and
water
flow
channel
to
maximize
the
efficiency
of
parabolic
dish
collectors.
Stagnation
heating
experiments
were
conducted
at
90–150
kg/h
rates.
The
stagnation
temperature
was
as
high
388°C,
total
heat
loss
coefficient
342
W/m
2
K.
primary
finned
PCM
channels
enhanced
energy
absorption
decreased
temperature.
spiral
coil
rectangular
fins
efficiently
transferred
incoming
water.
had
maximum
power
2.81
kW
150
kg/h,
32%
16%
greater
than
90
120
respectively.
Heat
higher
rates,
with
17.9%
lower
kg/h.
system
average
efficiencies
75.6%
50.7%,
respectively,
Exergy
reduced
rate,
peak
mean
values
9.4%
5%
Economically,
offers
low‐cost
clean
for
$0.11/kW,
CO₂
emission
is
by
14.7
tons.
Payback
time
estimated
1.1
years.
thermal,
economic,
environmental
performance
proposed
indicates
it
an
efficient
choice
industrial
commercial
applications.
