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Energy Conversion Systems – Options and Issues Chapter 7 (72) The results are presented in the form shown in Figure 7.3, where T2 is the geofluid temperature leaving the plant. If one knows the inlet (T ) and outlet (T ) geofluid temperatures, the power output 12 (73) (in kW) for a unit mass flow rate of one kg/s can be read from the graph. The total power output can then be obtained simply by multiplying this by the actual mass flow rate in kg/s. For example, a flow of 20 kg/s of a geofluid at 130°C that is discharged at 35°C can be estimated to yield a power output of 800 kW (i.e., 40 kW/(kg/s) times 20 kg/s). Finally, using the data from McKenna and Blackwell (2005) for the flow rates of waste water from petroleum production wells in the Gulf Coast states, plus the data for California (DOGGR, 2005), we can estimate the power that might be obtained if all the waste water were used in binary plants. The results are shown in Table 7.3 for an assumed outlet temperature of 40°C. To correct the power ( ) totals for an outlet temperature other than 40°C, one can use the following equation: 77 This equation was obtained from a simple fit to the calculated data and gives the change in the power output per degree Celsius change in outlet temperature as a function of the inlet temperature. Then the actual power output can be found from: As an example, let T1 = 100°C. From Table 7.3, the estimated power from Alabama’s waste water is 16.6 MW at T2 = 40°C. If T2 = 50°C, then from Eq. (72), the power gradient is negative 0.29775, and from Eq. (73), the actual power would be reduced to 13.6 MW. If the outlet temperature were 25°C, the power gradient would be the same, but the actual power would be increased to 21.1 MW.PDF Image | Energy Conversion Systems
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