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Energy Systems for Multigeneration Purposes

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Energy Systems for Multigeneration Purposes ( energy-systems-multigeneration-purposes )

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Chapter 4: Descriptions of Systems In this PhD thesis three different multigeneration energy systems are modeled, analyzed and optimized. It is aimed to select three novel multigeneration energy systems to produce electricity, heating, cooling, hot water, fresh water and hydrogen. It is tried to use different sources of energies as a heat source from conventional to renewable energy sources. This chapter is categorized in there subsections to describe each system. 4.1 System I: Multigeneration system based on gas turbine prime mover As it was completely discussed in literature, gas turbine is one of the good candidates to be considered as a prime mover because of the reasons discussed earlier. Therefore, one of the multigeneration energy systems here is based on this prime mover. This system is composed of five different subsystems. As it is shown in Fig. 4.1, electricity is produced by a gas turbine and a steam turbine while cooling is produce based on two different cycles, a single effect absorption chiller and an ejector refrigeration cycle. To produce hydrogen, a PEM electrolyzer working by electricity produced from ejector is used. Finlay a domestic water heater is used to make use of the energy from absorption generator. A complete explanation of each subsystem is given bellow. Fig. 4.1 illustrates an integrated multigeneration system containing a compressor, a combustion chamber (CC), a gas turbine, a double pressure heat recovery steam generator (HRSG) to produce superheated steam, a single effect absorption chiller, a heat recovery vapor generator (HRVG) to produce ORC vapor that is driven by heat from flue gases from the HRSG, an organic Rankine cycle (ORC) ejector refrigeration system, a PEM electrolyzer for hydrogen production and a domestic water heater for hot water production. Air at ambient conditions enters the air compressor at point 1 and exits after compression (point 2). The hot air enters the combustion chamber (CC) into which fuel is injected, and hot combustion gases exit (point 3) and pass through a gas turbine to produce shaft power. The hot gas expands in the gas turbine to point 4. Hot flue gases enter the double pressure HRSG to provide high and low pressure steam at points 5 and 14. High pressure steam enters the steam turbine to generate shaft power while the low pressure steam enters the generator of the absorption system to provide the cooling load 49

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