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CHAPTER 7 Capstone PERFORMANCE Estimate Exhaust Characteristics The temperature and mass flow for the exhaust can now be estimated, using the information calculated above for net power plus the exhaust characteristics at sea level. The primary impacts to exhaust characteristics are ambient temperature (which impacts electrical efficiency) and net electrical output. A simple method to approximate the exhaust characteristics is to define the exhaust temperature as if the system were operating at sea level, and then make adjustments to the exhaust mass flow to reflect changes in the net electrical output due to elevation, inlet pressure loss, and exhaust backpressure. An additional reduction of 0.5 percent per 1,000 ft elevation should be added to the exhaust mass flow calculation. So, for a given ambient condition use the following equations: Exhaust Temp (elevation) = Exhaust Temp (sea level) kWe (elevation) 0.005 x Elevation [ft] Exhaust Flow (elevation) = Flow (sea level) X kWe (sea level) X [1 - 1,000 ] For the example above at 30 C (86 F) and 1,500 ft elevation, the exhaust temperature from Table 7-2 is 570 F and exhaust flow is 2.87 lbm/s. From Table 7-2 the electric power output at sea level is 187kW, and from Figure 7-2 the electric power output at 1,500ft elevation is 176kW. Using the equations above: Exhaust Temp (elevation) = 570 F Exhaust Flow (elevation) = 2.70 lbm/s 410066 Rev C (June 2009) 7-12 Capstone reserves the right to change or modify, without notice, the design, specifications, and/or contents of this document without incurring any obligation either with respect to equipment previously sold or in the process of construction.PDF Image | CAPSTONE C200 MICROTURBINE TECHNICAL REFERENCE
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