WASTE HEAT RECOVERY FROM A HIGH TEMPERATURE DIESEL ENGINE

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WASTE HEAT RECOVERY FROM A HIGH TEMPERATURE DIESEL ENGINE ( waste-heat-recovery-from-high-temperature-diesel-engine )

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Like the previous chapter describing the data analysis from the experimental results, this chapter will use a representative point to provide sample results for the heat exchanger model calculations. The representative data points for each heat exchanger will be based on the 3100 rpm, 24 N-m, 150°C coolant temperature engine operating point, modeled with a 90°C condenser temperature. The heat exchanger model equations were solved simultaneously, so some of the values for the representative point that are necessary to complete the sample calculations were outputs of the iterative solver in EES. 5.3.1 Condenser Model The WHR system condensers were modeled as compact aluminum cross-flow heat exchangers with micro channels and louvered fins (Figure 5-5). This design results in maximum heat transfer with minimal air-side pressure drop in a relatively small package despite the small temperature difference between the ethanol and ambient air. The ethanol vapor enters and undergoes a temperature drop in the single-phase section of the condenser. The ethanol begins to condense in the two-phase section and becomes 100% ethanol vapor at the exit of the condenser. The configuration of microchannel tubes and louvered fins is shown in detail in Figure 5-6. The Figure 5-5. Diagram showing the cross-flow condenser configuration as well as single-phase and two-phase sections. 86

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