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6.2 Results of system I For thermodynamic modeling, the multigeneration system considered here (Fig. 4.1) is divided into five 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. In order to model the system, energy balances are considered for each system component. The dead state is taken to be P0 = 1.01 bar and T0 = 293.15 K. 6.2. 1 Modeling results Several simplifying assumptions are made here to render the analysis more tractable, while retaining adequate accuracy and allowing the principal points of the article to be illustrated: All processes occur at steady state. Air and combustion products are ideal-gas mixtures as the temperature is high the pressure is low so the ideal gas assumption is reasonable. Heat loss from the combustion chamber is 2% of the fuel lower heating value, and all other components are adiabatic. Both HP and LP pinch temperatures are constant at 10oC. The flow across the throttle valve is isenthalpic. The ORC working fluid at the evaporator outlet is a saturated vapor. Pressure drops in ORC cycle are negligible. Heat losses from piping and other auxiliary components are negligible. To model the gas turbine based multigeneration system, some parameters are selected as input data for the simulation. The input data for the simulation are listed in Table 6.1. Also, Table 6.2 lists the parameters used to simulate the PEM electrolyzer. To ensure the accuracy and validity of the developed computer simulation code, the PEM electrolyzer simulation is validated with experimental data from the literature. 115PDF Image | Energy Systems for Multigeneration Purposes
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