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710 B1 (brine inlet) 100 88 B2 (brine outlet) 60 88 1 (turbine inlet) 71 77 2 (condenser outlet) 26 77 3 (cooling water outlet) 21 380 4 (cooling water inlet) 13 380 A1 (air wetbulb) 7.2 Chapter 7 Energy Conversion Systems – Options and Issues Table 7.4 Cycle parameters for 1 MW binary plant at NPR No. 3 (see Figure 7.1). Statepoint (description) Temperature, °C Mass flow rate, kg/s Design of 1 MW binary plants for lowtomoderate temperatures. The results of an engineering design exercise for a series of binary plants operating on low to moderatetemperature geofluids are presented in Figure 7.4. Shown are two curves as a function of the geofluid temperature: (1) the specific installed plant cost in $/kW and (2) the specific power output in kW/(kg/s). All the systems represented by the points on these curves have been designed as nominal 1 MW power plants, but we think that the results would apply reasonably well to units up to 5 MW in capacity. The working fluid is R134a for the three low temperatures, and they are subcritical cycles. Isobutane is the working fluid for the two highertemperature cases. The 150°C case is slightly subcritical, while the 200°C case is supercritical. The geofluid discharge temperature is 60°C for all the cases, except for the 200°C supercritical case. For the lowertemperature cases, 60°C is necessary to maintain reasonable pinch point temperature differences in the heat exchangers. The supercritical case does not experience a sharp pinch point between the preheater, and the vaporizer and the fluid can be cooled to 50°C. Notice that the specific plant cost approaches $1,500/kW at the highest temperatures considered, and that the specific power or utilization effectiveness increases dramatically as the geofluid temperature increases.PDF Image | Energy Conversion Systems
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