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Energy Conversion Systems

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Energy Conversion Systems ( energy-conversion-systems )

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Chapter 7 Energy Conversion Systems – Options and Issues Table 7.14 Average power needs for MIT­COGEN system, June 2004­May 2005. 7­26 Electricity demand, kW 22,900 Steam production, lbm/h 167,000 Steam production, kg/s 21 Chiller cooling, ton 5,000 Chiller cooling, Btu/h 60,000,000 Chiller cooling, kWth 17,500 Item Amount Figure 7.19 is a flow diagram in which an EGS wellfield replaces the fossil energy input to the existing MIT­COGEN plant and supplies all of the current energy requirements. The current gas turbine generator set is rated at 20 MW but usually puts out more than that, typically 22 MW; the remainder of the electrical load must be supplied by the local utility. The power requirements will have to be produced by a new steam turbine driven by EGS­produced steam. We have selected a single­flash system with a back­pressure steam turbine. The exhaust steam from the turbine will be condensed against part of the heating load, thereby providing a portion of the total load for the moderate­ to lower­temperature applications. The separated liquid from the cyclone separators may also be used to supply some of the needs of the heating system. If the EGS system were to replicate the existing chiller plant, a side stream of the separated steam generated in the cyclone separator would be needed to drive the steam turbine­compressor sets. However, we think it is more practical for the EGS system to provide sufficient electricity from its steam turbine­generator to supply electric motors to power the chiller compressors. Another innovation that fits the new EGS system is to retrofit the campus to meet the heating and space cooling needs with ground­source heat pumps (GSHP). In the long­range view of this assessment, it will be beneficial to use GSHPs for space conditioning and to use electricity to drive the compressors.

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