Steady-State and Dynamic Characteristics of Secondary Loop CO <sub>2</sub> Thermal System for Electric Vehicles
SAE technical papers on CD-ROM/SAE technical paper series,
Год журнала:
2025,
Номер
1
Опубликована: Янв. 31, 2025
<div
class="section
abstract"><div
class="htmlview
paragraph">With
the
rapid
adoption
of
new
energy
vehicles
(NEVs),
effective
thermal
management
has
become
a
crucial
factor
for
enhancing
performance,
safety,
and
efficiency.
This
study
investigates
steady-state
dynamic
characteristics
secondary
loop
CO₂
(R744)
system
designed
electric
vehicles.
The
presents
several
benefits,
such
as
improved
safety
through
reduced
refrigerant
leakage
enhanced
integration
capabilities
with
existing
vehicle
subsystems.
However,
these
advantages
often
come
at
cost
decreased
thermodynamic
efficiency
compared
to
direct
systems.
Experimental
evaluations
were
conducted
understand
effects
varying
coolant
flow
rates,
discharge
pressure,
startup
behaviors.
Results
indicate
that
while
indirect
generally
shows
lower
coefficient
performance
(COP)
than
systems,
optimization
key
parameters
like
rate
pressure
can
significantly
enhance
performance.
Specifically,
optimizing
resulted
in
COP
increase
up
92.6%
under
certain
conditions,
proper
heating
capacity
Additionally,
analysis
behaviors
revealed
importance
effectively
managing
distribution
achieve
stable
operation
minimize
losses.
These
findings
provide
valuable
insights
into
engineering
feasibility
potential
improvements
By
focusing
on
rate,
management,
control,
this
supports
development
more
sustainable
energy-efficient
solutions
NEVs,
ultimately
contributing
wider
environmentally
friendly
transportation
technologies.</div></div>
Язык: Английский
Performance Investigation of a Cabin Thermal Management System for Electric Vehicles Based on R290 Refrigerant
International Journal of Energy Research,
Год журнала:
2025,
Номер
2025(1)
Опубликована: Янв. 1, 2025
Electric
vehicle
(EV)
thermal
management
systems
(TMSs)
face
a
critical
challenge
in
adopting
environmentally
friendly
refrigerants,
essential
for
adaptability,
safety,
driving
range
optimization,
and
passenger
comfort
across
wide
temperature
ranges.
This
study
investigates
the
use
of
R290,
low‐cost
refrigerant,
secondary‐loop‐based
TMS.
A
system
test
bench
was
established
to
validate
performance
experimentally,
comparison
made
with
using
R134a.
The
experimental
results
show
that
R290
charge
amount
is
approximately
50%
Under
low‐temperature
heating
condition
(0°C),
demonstrates
significant
advantages,
capacity
coefficient
(COP)
increasing
by
up
67.6%
36%,
respectively,
compared
At
extremely
low
temperatures
(−20°C),
achieves
COP
1.24,
further
showcasing
its
superior
performance.
high‐temperature
cooling
conditions
(35
43°C),
exhibits
slightly
lower
R134a;
however,
remains
sufficient
meet
operational
requirements
In
summary,
proposed
TMS
as
refrigerant
excellent
promising
potential
application
EVs
operating
conditions.
Язык: Английский