The University of Brighton in the United Kingdom recently conducted a test on the Automotive Organic Rankine Cycle (ORC) waste heat recovery system. In this test, the researchers used a new type of linear free piston expander and overcome multiple technical obstacles. A big breakthrough.
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In the initial simulation test, the electrical power of the ORC system could be scaled down from 20 kW (heavy trucks) to 3 kW (light trucks and passenger cars), and the researchers concluded that the ORC system can be used in the exhaust Waste heat is converted into electrical power, which has an effect on the powertrain or auxiliary load.
After the above physical tests, the researchers can verify the simulation tools and finally obtain the data, which will enable the researchers to enhance their confidence in future customized services.
The University of Brighton project is funded by the UK government, which extracts energy from a hot gas source by using a linear free piston expander in the ethanol Rankine cycle.
The researchers say that the free piston expander system has more advantages than the turbine generator system, and its operation is more flexible, while the two-phase flow tolerance also makes the power output more efficient under partial load and transient conditions. In addition, the free piston expander system provides a greater expansion ratio to accommodate the ethanol/water Rankine cycle.
It is reported that the researchers integrated the piston geometry, generator design and cylinder structure during the test. This novel structure reduces the translational quality of the piston relative to the generator, thus controlling piston movement more efficiently and accurately.
The linear free-piston expander also uses a novel delivery valve layout to measure the high-pressure feed fluid entering the expansion chamber, which also eliminates the need for active intake valve control, making the industry easier and more efficient. s solution.
The initial test results will be announced in the third quarter of this year, and the entire test is expected to be completed by the end of this year.
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