18-10-2014, 10:47 PM
Abstract
Automotive engines reject a considerable amount of
energy to the ambience through the exhaust gas. Significant
reduction of engine fuel consumption could be attained by
recovering of exhaust heat by using thermoelectric
generators. One of the most important issues is to develop an
efficient heat exchanger which provides optimal recovery of
heat from exhaust gases.
The work presents a design and performance
measurements of a prototype thermoelectric generator
mounted on self-ignition (Diesel) engine. Using the
prototype generator as a tool, benchmark studies were
performed for improvements in the heat exchanger including
determination of temperature distribution and heat flux
density.
Introduction
Contemporary car engines exchange app. 30-40% of heat
generated in the process of fuel combustion into useful
mechanical work. The remaining heat is emitted to the
environment through the exhaust gases and the engine
cooling systems. Therefore, even partial use of the wasted
heat would allow a significant increase of the overall
combustion engine performance. Changing the heat energy
of the exhaust gases into electric power would bring
measurable advantages. Modern cars equipped with
combustion engines tend to have large numbers of
electronically controlled components. The observed
tendency is to replace mechanical components with the
electronic ones. This increases the demand for electric
power received through the power supply systems of the
vehicle. This tendency will undoubtedly remain at least due
to the legal regulations connected with the on-board
diagnostic systems, which force a more comprehensive
control of operation of the vehicle components in the respect
of safety improvement and emission control. This leads to
the significant increase of demand for electric power in the
vehicle which has to be generated by the alternator. It is
predicted that if only 6% of the heat contained in the exhaust
gases was changed into electric power, it would allow to
lower fuel consumption by 10% due to the decreased waste
resulting from the resistance of the alternator drive [1].
Power generation system using the thermoelectric
generator should generally consist of the following
components: heat exchanger, thermoelectric module, cooling
system and DC/DC voltage converter. One of the most
important design issues related to the construction of the
thermoelectric generator TEG is to develop an efficient heat
exchanger, which should provide optimal recovery of heat
from exhaust gases.
fore more:
http://docs.googleviewer?a=v&q=cach...4Cig3z9Nrw
Automotive engines reject a considerable amount of
energy to the ambience through the exhaust gas. Significant
reduction of engine fuel consumption could be attained by
recovering of exhaust heat by using thermoelectric
generators. One of the most important issues is to develop an
efficient heat exchanger which provides optimal recovery of
heat from exhaust gases.
The work presents a design and performance
measurements of a prototype thermoelectric generator
mounted on self-ignition (Diesel) engine. Using the
prototype generator as a tool, benchmark studies were
performed for improvements in the heat exchanger including
determination of temperature distribution and heat flux
density.
Introduction
Contemporary car engines exchange app. 30-40% of heat
generated in the process of fuel combustion into useful
mechanical work. The remaining heat is emitted to the
environment through the exhaust gases and the engine
cooling systems. Therefore, even partial use of the wasted
heat would allow a significant increase of the overall
combustion engine performance. Changing the heat energy
of the exhaust gases into electric power would bring
measurable advantages. Modern cars equipped with
combustion engines tend to have large numbers of
electronically controlled components. The observed
tendency is to replace mechanical components with the
electronic ones. This increases the demand for electric
power received through the power supply systems of the
vehicle. This tendency will undoubtedly remain at least due
to the legal regulations connected with the on-board
diagnostic systems, which force a more comprehensive
control of operation of the vehicle components in the respect
of safety improvement and emission control. This leads to
the significant increase of demand for electric power in the
vehicle which has to be generated by the alternator. It is
predicted that if only 6% of the heat contained in the exhaust
gases was changed into electric power, it would allow to
lower fuel consumption by 10% due to the decreased waste
resulting from the resistance of the alternator drive [1].
Power generation system using the thermoelectric
generator should generally consist of the following
components: heat exchanger, thermoelectric module, cooling
system and DC/DC voltage converter. One of the most
important design issues related to the construction of the
thermoelectric generator TEG is to develop an efficient heat
exchanger, which should provide optimal recovery of heat
from exhaust gases.
fore more:
http://docs.googleviewer?a=v&q=cach...4Cig3z9Nrw
