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condenser temperature of 90°C, the efficiency gain rose from 11.6% at 90°C to 24.2% at 200°C, or a 109% relative increase. Without the decrease in exhaust temperature seen at 175°C, it is possible the gains may have been even greater above 150°C. However, the ultimate effect of increased running temperatures on actual engine efficiency is also unknown and might offset some of these gains. Regardless, the results suggest that the efficiency gains from elevated coolant temperature are likely to be significant and the concept warrants further investigation. The next section will describe the results of the individual heat exchanger modeling and present the footprint differences between the WHR systems. 6.4.3 Heat Exchanger Footprint The performance of a WHR system is not the only consideration in deciding whether to adopt this technology for a given application. The space required to package the system is often of primary concern and the heat exchangers account for most of the required space of a WHR system. The heat exchanger models described in the previous chapter are meant to give estimates of the footprint of the four heat exchangers for the WHR systems (condenser, evaporator, superheater, and recuperator), plus the oil coolers that will likely be necessary to keep oil temperatures at reasonable levels. The height and width of each heat exchanger was fixed for all cases with the length as the only variable to make comparison simple. The heat exchangers were modeled in SolidWorks® to provide a visual representation of the footprint required for each heat exchanger in the different WHR systems. Drawings of the heat exchanger models are shown in Figures 6-36 through 6-43, including the major dimensions given in mm. As previously mentioned, each system was modeled with condenser temperatures of 60°C and 90°C. The lower condenser temperature proved to provide greater WHR output and increased overall efficiency. However, comparing the footprint of the 60°C condenser heat exchangers in 175PDF Image | WASTE HEAT RECOVERY FROM A HIGH TEMPERATURE DIESEL ENGINE
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