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2014•Advanced materials researchOpen access

Research of Diesel Engine Waste Heat Organic Rankine System

Jun Qi Dong, Xian Hui Zhang, Jian Zhang Wang, Bin Wang

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Abstract

Organic Rankine Cycle (ORC) is an attractive technology solution in waste heat recovery. There is about 60% energy of fuel as waste heat is discharged to atmosphere in the diesel engine. The 15kw ORC plant had been developed using the diesel engine waste heat, which including the jacket coolant and exhaust gas. The working fluid is the R245fa, the plate type heat exchangers were used as the condenser and evaporator in the ORC systems, the twine screw expander as the working machine. The performance of condenser and evaporator had been simulated and developed using the distributed parameters calculations methods according to the effective-NTU. The ORC system and engine can stable run for a long time without frequently control acting. The ORC systems can bring 15.4 kW electric energy in the stable condition. The efficiency based on the first law of thermodynamics is 7.7%; completely generating efficiency is 6.8%.

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What this paper is about

Organic Rankine Cycle (ORC) is an attractive technology solution in waste heat recovery. There is about 60% energy of fuel as waste heat is discharged to atmosphere in the diesel engine. The 15kw ORC plant had been developed using the diesel engine waste heat, which including the jacket coolant and exhaust gas. The working fluid is the R245fa, the plate type heat exchangers were used as the condenser and evaporator in the ORC systems, the twine screw expander as the working machine. The performance of condenser and evaporator had been simulated and developed using the distributed parameters calculations methods according to the effective-NTU. The ORC system and engine can stable run for a long time without frequently control acting. The ORC systems can bring 15.4 kW electric energy in the stable condition. The efficiency based on the first law of thermodynamics is 7.7%; completely generating efficiency is 6.8%.

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Available abstract

Organic Rankine Cycle (ORC) is an attractive technology solution in waste heat recovery. There is about 60% energy of fuel as waste heat is discharged to atmosphere in the diesel engine. The 15kw ORC plant had been developed using the diesel engine waste heat, which including the jacket coolant and exhaust gas. The working fluid is the R245fa, the plate type heat exchangers were used as the condenser and evaporator in the ORC systems, the twine screw expander as the working machine. The performance of condenser and evaporator had been simulated and developed using the distributed parameters calculations methods according to the effective-NTU. The ORC system and engine can stable run for a long time without frequently control acting. The ORC systems can bring 15.4 kW electric energy in the stable condition. The efficiency based on the first law of thermodynamics is 7.7%; completely generating efficiency is 6.8%.

Key concepts: Organic Rankine cycle, Evaporator, Condenser (optics), Waste heat, Waste heat recovery unit, Waste management, Working fluid, Diesel engine

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