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2 21st Aachen Colloquium Automobile and Engine Technology 2012 2 System In the following an introduction to the layout and the function of a waste heat recovery (WHR) system is given. In the steam power process, cf. Fig. 1, a working fluid is delivered by a fluid pump from a lower pressure to a higher pressure level and is conveyed through a distributor valve into the evaporators. These evaporate the working fluid with the heat from the exhaust gas. The expansion machine generates power. The steam from the outlet is re-liquefied in the condenser. There the residual heat is released to the cooling system. For conditions such as overrun mode, an operation without energy transformation is necessary. In this case the steam is released via a bypass valve directly to the condenser. A condensate pump delivers the working fluid to the vessel. After the vessel the liquid working fluid is again conveyed to the fluid pump. The system is controlled by a separate Control Unit, which can be realized as a separate component or the system functions can be integrated into an engine control unit. Different system layouts can be realized including different locations of actuators and sensors. The reasons for this are various customer needs, operating conditions or working fluids. Thus Fig. 1 shows an exemplary system layout. Fig. 1: Example layout for the WHR system The thermal power input to the WHR system ranges typically from 100 kW to 300 kW. A key component of the WHR system is the expansion machine. The BOSCH group is currently working on two pre-studies for the two concepts piston machine and turbine. These concepts are selected mainly by using the following criteria: thermal / mechanical efficiency, weight, packaging, influence on entire process efficiency, durability and vibrations.PDF Image | Waste Heat Recovery for Commercial Vehicles with a Rankine Process
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