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730 Chapter 7 Energy Conversion Systems – Options and Issues • Fluids derived from EGS reservoirs can be used in innovative cogeneration systems to provide electricity, heating, and cooling in conjunction with groundsource heat pumps. For example, the current MIT energy needs could be met with an EGS power plant with a 32 MW rating; this could be achieved with a flow rate of 1,760 kg/s from a 200°C EGS reservoir using a singleflash system – or a 470 kg/s flow rate from a 250°C EGS reservoir using a doubleflash system – and back pressure turbines. • The installed specific cost ($/kW) for either a conventional 1 or 2flash power plant at EGS reservoirs is inversely dependent on the fluid temperature and mass flow rate. Over the range from 150340°C: For a mass flow rate of 100 kg/s, the specific cost varies from $1,8941,773/kW (1flash) and from $1,8891,737/kW (2flash); for a flow rate of 1,000 kg/s, the cost varies from $1,7601,080/kW (1flash) and from $1,718981/kW (2flash). • The total plant cost, exclusive of wells, for a 2flash plant receiving 1,000 kg/s from an EGS reservoir would vary from $50 million to $260 million, with a fluid temperature ranging from 150340°C; the corresponding power rating would vary from about 30265 MW. If the reservoir were able to supply only 100 kg/s, the plant cost would vary from $5.6 million to $45.8 million over the same temperature range; the corresponding power rating would vary from 326.4 MW. It should be noted that the possibility of using supercriticalpressure carbon dioxide as the circulating fluid in the EGS reservoir, alluded to in other parts of this report, has not been analyzed in this chapter. The use of CO2 as the heattransfer medium raises a number of complex questions, the resolution of which lies beyond the scope of this report. The reader may consult Brown (2000) for an excellent discussion of this concept.PDF Image | Energy Conversion Systems
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