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Chapter 7 PW GSHP (cooling) MIT Cooling Load Energy Conversion Systems – Options and Issues GSHP P P P T/G IW (heating) MIT Heating Load 728 Figure 7.20 EGS system to supply MITCOGEN energy requirements using groundsource heat pumps. The EGS version of the COGEN plant will be as flexible as possible to accommodate varying electrical, heating, and cooling loads. However, for this analysis, it is assumed that the electrical load is a nominal 22 MW – the total heating load requires 21 kg/s of steam at 1.48 MPa and 227°C, and the cooling load is 5,000 tons of refrigeration or 17,500 kWth. The steam condensate returns saturated at about 109°C; thus, the heating load is roughly 50,700 kWth. To find the electricity needed to drive the compressors of the GSHPs, we assumed that the COP is 5.0 in the heating mode and 7.3 in the cooling mode (U.S. DOE, 2005). Thus, on these bases, the electrical input would be 10,140 kWe to power the GSHP heating system, and 2,400 kWe to power the cooling plant. The base electric power requirement of 22 MW must be added to these, giving a total electrical output from the EGSdriven turbinegenerator of 32.1 MW. This would require a mass flow rate of about 470 kg/s from an EGS reservoir having a temperature of 250°C, assuming a back pressure turbine is used with a doubleflash system. The required fluid flow rate might be somewhat lower if a condensing, extraction turbine is used, but we did not perform the engineering analysis to assess this possibility. The type of system described here for the MIT situation can be used as a model for other similar applications. It can accommodate other directheat uses such as the processing of agricultural products such as foodstuffs and biomass, or in aquaculture, because only low to moderatetemperature fluids are needed. Applications of this kind are common at existing hydrothermal plants around the world (Lund, 2005), and would make sense for power plants operating on EGSderived fluids.PDF Image | Energy Conversion Systems
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