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BETWEEN 60 % AND 80 % OF THE APPLIED FUEL ENERGY IN HEAT ENGINES IS LOST TO THE AMBIENT ENVIRONMENT AS WASTE EXHAUST HEAT. SUITABLE EQUIPMENT COULD TURN SOME OF THAT HEAT INTO USEFUL MECHANICAL ENERGY, E.G. AN EXHAUST GAS TURBINE, A STIRLING ENGINE OR A STEAM-DRIVEN SYSTEM.
DAIMLER-BENZ AG CARRIED OUT A FEASIBILITY STUDY OF THE POSSIBLE APPLICATION OF A DIESEL ENGINE COUPLED WITH A RANKINE BOTTOMING CYCLE. IT IS SHOWN THAT A 38 T HEAVY-DUTY TRUCK OF 206 KW ON A LONG HAUL (ROTTERDAM-VERONA) CAN REDUCE ITS FUEL CONSUMPTION FOR THE SAME OUTPUT BY 10.5 % (USING THE WORKING FLUID FLUORINOL-50). ACCORDING TO ROUGH ESTIMATES THIS CORRESPONDS TO APPROX. 90,000 T OF DIESEL FUEL PER YEAR ON FUEL SAVINGS IN THE FEDERAL REPUBLIC OF GERMANY (BASED ON THE FIGURES FOR 1980). THE PAYBACK TIME OF THIS SYSTEM IS HOWEVER TOO LONG UNDER THE PRESENT TECHNICAL AND ECONOMIC CONDITIONS.
THE UNREALISTIC LIMIT CASE OF THE ADIABATIC DIESEL ENGINE (NO HEAT EXCHANGE BETWEEN GAS AND WALL) WITH BOTTOMING CYCLE WAS ALSO INCLUDED IN THE CALCULATIONS AS THE THEORETICAL LIMIT AND THE RESULTS INDICATED FUEL SAVINGS OF 25 %. IF WE CONSIDER A TREND TO HIGHER ENERGY PRICES, THE INSULATED DIESEL ENGINE (REDUCED HEAT EXCHANGE BETWEEEN GAS AND WALL) OPERATING AT HIGHER TEMPERATURES AND EFFICIENCY TOGETHER WITH A RANKINE BOTTOMING CYCLE MAY HAVE A CHANCE IN FUTURE EVEN FROM AN ECONOMIC POINT OF VIEW.
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70327 Stuttgart
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