Novel heat exchanger for cold air intake on spark ignition engine performance
The engine intake charge air (EICA) system enhancement technology plays an essential part in vehicle engine performance developments and pollution reduction. The increase in ambient temperature due to global warming and climate change introduced a significant influence on vehicle performance. Sam...
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| Main Author: | |
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| Format: | Thesis |
| Language: | English |
| Published: |
2021
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/97838/1/FK%202021%2085%20-%20IR.1.pdf |
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| Summary: | The engine intake charge air (EICA) system enhancement technology plays an essential
part in vehicle engine performance developments and pollution reduction.
The increase in ambient temperature due to global warming and climate change
introduced a significant influence on vehicle performance. Same while, EICA
temperature increasing affects the engine complete combustion due to the oxygen
density per volume reduction in air. Thus, EICA cooling technology becomes one of the
best solutions for temperature reduction through intercooler units. This research
introduces the influence of direct combustion volumetric effect using a new designed
evaporative intercooler heat exchanger (EIHE), direct intercooler device used for engine
intake charge air cooling (EICAC) in non-turbocharged vehicles spark-Ignition
engines (SI-engines), contributing a new technique method in heat-exchanger
designing.
Most of the previous studies of conventional intercoolers heat-exchangers (IHE)
devices demonstrated a significant influence of EICAC on engine performance.
However, it presented low efficient or non-operational in vehicle slow driving speed
or stand-still operation. Furthermore, the designs showed non-flexibility in size
and low cooling capacity. Therefore, there is a need for a better IHE design with
flexibility in size designing suitable for most vehicles, able to function in all
environments and weather conditions, with the ability of vehicle performance
enhanced. The new design should be functional in both vehicle low-speed driving or
stand-still parking operation.
Refrigerant medium system technology becomes significant in heat transfer
property which helps to design subcooling heat-exchanger. The new EIHE device
utilizing the refrigerant medium which presented a better performance than the
water cooled IHE reaching lower cooling range temperature and functional in all
vehicle condition. The Computational Fluid Dynamics (CFD) simulation was used using ANSYS FLUENT
to simulate various EIHE models performance with different air flow rate and
temperatures. The EIHE geometry shell-and-tube was designed from steel metal, based
on criteria of space available inside the vehicle engine bay. The simulation results
presented a significant improvement in cooling performance with temperature reduction
lower than the inlet temperatures, offering a very low-pressure drop coefficient. The
EIHE design was experimentally validated. For the experimental part, the EIHE device
was tested both in the laboratory and real-world. The EIHE operation and performance
evaluation investigated in real-world tests. The tests result generally presented a
significant cooling performance capability by the developed EIHE almost efficient of
49% - 50% reduction in temperature. The applied vehicle test results presented a
significant enhanced improvement in the max power wheel and max torque
increasement, and test results of real-world test utilizing the EIHE presented a significant
emission reduction of 12.86% of CO, 29.32% CO2, and 29.41% HC. In conclusion, the
new designed EIHE successfully meet the required objectives. |
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