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B1 1 T/G Energy Conversion Systems – Options and Issues E CSV CT A1 SR P PH 2C 3 CWP B2 4 M PW IP CPFF IW Figure 7.1 Basic binary power plant in simplified schematic form (DiPippo, 2005). 75 Chapter 7 For this study, we examined this resource, beginning with a survey of current binary power plant performance, to determine the effect that geofluid temperature has on the cycle thermal efficiency. Once we found this dependency, we applied it parametrically to the known coproduced fluids in the seven Gulf Coast states included in McKenna et al. (2005), plus California. The results are presented as a function of fluid temperature because the coproduced fluids vary in temperature from field to field. Once the flow rate and the temperature are known for any site, our analysis allows an easy calculation of the electric power that can be installed. Thus, for each state, we have calculated the expected total power potential, in MW, as a function of the fluid temperature. This analysis is based on a correlation for the thermal efficiency derived from several actual binary plants. The thermal efficiency is defined in the standard way as the ratio of the net power output to the rate of heat input, i.e., input thermal power (Moran and Shapiro, 2004). The plants used in the correlation are shown in Table 7.2, and the data are plotted in Figure 7.2 with the correlation equation for thermal efficiency as a function of geofluid temperature. All of the plants are organic Rankine cycles (ORCs), with the Húsavík plant being a Kalinatype plant using a waterammonia mixture as the working fluid. The data used for the efficiencies come from various sources and may be found in DiPippo (2004). There is considerable scatter in the efficiency data because of the variety of plant configurations represented by the data. The pinchpoint temperature difference in the brineworking fluid heat exchangers is an important factor in determining the plant thermal efficiency, and this value is not reported in the literature. However, for the purposes of this study, the efficiency correlation is considered accurate enough to show the dependence of binary plant efficiency on the geofluid temperature.PDF Image | Energy Conversion Systems
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