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35 34 33 32 31 30 29 28 27 26 25 20 30 40 50 60 Ambient Temp. (F) 90 100 110 120 34 33 32 31 30 29 28 -4 -2 0 2 4 6 8 BackPressure(inH O) New data w/ f P ositive ixed flow meter back pressure Negative back pressu re Capstone Design Review (10/03) Capstone Design Review Figure 3.2.1 C200 electrical efficiency 70 80 Although the efficiency of the C200 was accurately predicted, the parasitic losses were grossly underestimated, resulting in an over-prediction of the available exhaust energy. As stated above, the turbine enclosure has two major chambers that require adequate ventilation - the engine and the electronics. External air is sucked through the louvers and circulated through these chambers and blown out through the cooling vents. Measurements were conducted on two different days to survey the amount of heat rejected through these vents. A systematic grid was laid out defining a control surface. At each grid point, the temperature and the air velocity was measured and the heat flux through the control surface was then calculated. These surveys indicated that 52kW of energy was lost from microturbine # 4 and 57 kW was lost from microturbine #3 for a total loss of 109 kW. Table 3.2.1 and Table 3.2.2 below show sample data and the corresponding calculation used to determine the heat loss through the cooling vents. In addition thermal energy was lost through natural convection from the enclosure surfaces. The surface temperature was measured to estimate the lost heat by natural convection. It was determined that each unit lost 17 kW by this process. Therefore the total heat loss from both mechanisms was 143 kW. 74 Efficiency EfficiencyPDF Image | ADVANCED MICROTURBINE SYSTEMS Final Report for Tasks 1 Through 4 and Task 6
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