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209 7.4 Results and Discussion Steady-state testing was performed at 40% of the maximum engine power owingto the limitations of the dynamometer. This pointcorresponds to 1790 rpm, 450 N.m and 81 kW as represented in Figure 7-4 (red dot). 7.4.1 Overview of the Results The recording of test data was initiated once the thermal equilibrium (steady state) was achieved. Therefore, the time (x-axis) shown in latter figures in this section is the time after recording and not the time from the beginning of the test. The temperature of the exhaust gas is the main external factor that affects cycle performance. Figure 7-10 and Figure 7-11 present the effect of the exhaust gas temperature on the temperature and pressure of both the oil through the evaporator and the working fluid through the turbine at constant working fluid mass flow rate (0.33 Kg/s). Figure 7-10shows that the oil temperature increases at a constant rate with the exhaust gas temperature. Consequently, the temperature of the working fluid at the turbine inlet increases proportionately. Furthermore, the temperature at the turbine exit increases proportionately with the temperature of the exhaust gas. The temperature drop between the inlet and exit of the turbine is a result of the expansion process within the turbine. The maximum difference in the temperature of the oil between the inlet and exit of the evaporator is 14.4°C, whereas it is 12.3°C forthe organic fluid between turbine inlet and exit at the maximum exhaust gas temperature. Figure 7-11 presents the effect of the exhaust gas temperature on the pressure of oil and working fluid. As can be seen in the figure, the increase of the oil pressure at the inlet and exit of the main heat exchanger is negligible,indicating a steady-state condition. The pressure of the turbine inlet increases by 0.4 bar with the temperature of exhaust gas. However, the turbine exit pressure is almost constant during the process because the exit pressure is not directly related to the evaporator exit. As previously mentioned, these resultsamples are taken at a constant working fluid massPDF Image | Automotive Radial Turbine Expander Design WHR
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