WORKING FLUID SELECTION AND DESIGN OF SMALL-SCALE WASTE HEAT RECOVERY SYSTEMS BASED ON ORGANIC RANKINE CYCLES

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WORKING FLUID SELECTION AND DESIGN OF SMALL-SCALE WASTE HEAT RECOVERY SYSTEMS BASED ON ORGANIC RANKINE CYCLES ( working-fluid-selection-and-design-small-scale-waste-heat-re )

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104 7 Waste heat recovery of large scale reciprocating engine 40 30 20 10 0 toluene n−pentane R245fa cyclohexane 80 100 120 140 o T , [ C] CA,out toluene n−pentane R245fa cyclohexane 40 30 20 10 0 (a) 80 100 120 140 o T , [ C] CA,out (b) 40 30 20 10 0 toluene n−pentane R245fa cyclohexane 80 100 120 140 o T , [ C] CA,out (c) Figure 7.7: The effect of charge air temperature at the outlet of the evaporator on the ratio of theoretical heat transfer area to net power output for different organic working fluids with charge air inlet temperatures of (a) 180 ◦C, (b) 200 ◦C, and (c) 220 ◦C. case study was performed for a large industrial gas-fired diesel engine having an electric power output of 16.6 MW. The EG temperature after the turbocharger of the engine is 395 ◦C and the EG mass flow rate is 27.0 kg/s. The CA temperature after the turbocharger is 210 ◦C and the CA mass flow rate is 26.2 kg/s. The selected working fluids for the anal- ysis were toluene in EG heat recovery and R245fa in CA heat recovery. The main results are presented in Table 7.2. The results show that by utilizing the EG heat, a maximum increase of 11.4 % in the electric power output was obtained for the selected engine. The CA heat utilization increases the power output of the engine system by 2.4 %. 2 A /P , [m /kW] theo e,net 2 A /P , [m /kW] theo e,net 2 A /P , [m /kW] theo e,net

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