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5.5 Analyses of System I For the analysis of system one thermodynamic analysis, exergy and exergoeconomic analyses are conducted as follows: 5.5.1 Thermodynamic analysis For thermodynamic modeling, the multigeneration system considered in Fig. 4.1 is divided into six main parts: gas turbine (Brayton) cycle, Rankine cycle with double pressure HRSG, a single effect absorption chiller, organic Rankine cycle (ORC), domestic water heater and PEM electrolyzer. The fuel injected to the combustion chamber is natural gas. We determine the temperature profile in the plant, input and output enthalpy and exergy flow rates, exergy destructions rates, and energy and exergy efficiencies. The energy balances and governing equations for various multigeneration components (see Fig. 4.1) are written as follows: 5.5.1.1 Brayton cycle Brayton cycle is composed of 4 major components as Air compressor Air at ambient pressure and temperature T1 enters the compressor. The compressor outlet temperature is a function of compressor isentropic efficiency (AC ), compressor pressure ratio (rAC) and specific heat ratio, as follows: a 1 T2T1(1 (rACa 1 1)) (5.23) The compressor work rate is a function of air mass flow rate ( m a ), air specific heat and temperature difference, and can be expressed as follows: ̇ AC ̇ ( ) (5.24) where γa is the air specific heat ratio, and Cpa is treated as a function of temperature as follows [75]: () ( )( )( )( ) (5.25) 68PDF Image | Energy Systems for Multigeneration Purposes
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