TU Berlin is currently developing a small-scale exhaust heat driven cooling system for turbocharged inlet air cooling of gasoline combustion engines below ambient temperature in order to increase the engine efficiency. Several thermally-driven cooling processes have been taken into consideration for the mobile application. The jet-ejector process has been identified as the most adequate one due to its flexibility, simplicity and high power density. The experimental investigations concentrate on the decisive components which must be developed to demonstrate the feasibility of the concept, namely the exhaust gas heat exchanger and the jet-ejector itself. The first results of the heat exchange experiments prove that the heat flow transferred from the exhaust gases is sufficient to drive the cooling system in most instances of the engine operation. Furthermore, the results of the jet-ejector indicate that target COPth of about COPth = 0,2...0,3 seem to be feasible at process temperature levels exploitable for the thermally-driven charge air cooling. The experimentally demonstrated cooling capacities of about Q0 = 2...6,5 kW show that the down-scaling of the system to a range appropriate for the mobile application of charge air cooling has been successful.
Cooling below ambient temperature by an exhaust heat driven jet ejector cooling system
2013
14 Seiten, 9 Bilder, 7 Quellen
Aufsatz (Konferenz)
Englisch
Exhaust ejector improves both turbo cooling and propulsion
Engineering Index Backfile | 1946
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|Heat2Cool - engine operation at charge air cooling below ambient temperature
Kraftfahrwesen | 2013
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