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In this exergy analysis, the dead state is defined to have a pressure of P0 = 1.01 bar and a temperature of T0 = 293.15 K. Energy and exergy balances are used to model the system, while invoking reasonable assumptions. In order to model the integrated OTEC system, a simulation code using Matlab software is developed. Five main parts are first individually modelled, including individual exergy flow rates. Engineering equation solver (EES) is linked to Matlab to calculate the properties of the different working fluids (i.e., water and ammonia) such as pressure, temperature, enthalpy and entropy. Several simplifying assumptions are made here to render the analysis more tractable, while retaining adequate accuracy to illustrate the principal points of the study: All processes operate at steady state. The thermodynamic cycle of the integrated system in Fig. 4.3 is an ideal saturated Rankine cycle using pure ammonia as the working fluid. All the components are adiabatic. Pressure drops in ORC cycle are negligible. State 5 is saturated vapour. Heat losses from piping and other auxiliary components are negligible. In order to conduct the simulation, input data are required. For each subsystem certain reliable data are inputted to the simulation code in order to determine the outputs. Table 6.12 lists the input parameters for the OTEC system simulation. In addition, Table 6.13 lists the parameter used to simulate the PEM electrolyzer. Table 6.14 lists the thermodynamic specifications of the multigeneration system, including cooling load, the electricity generated by the turbines, the COP of the absorption chiller, and the mass flow rates of biomass, hydrogen, hot water and fresh water production. 6.4. 2 Exergy and economic analyses results The exergy analysis results are summarized in Fig. 6.78, and show that the highest exergy destruction occurs in the solar collectors, mainly due to the irreversibilities associated with the high temperature of sun which creates high exergy input. Moreover, the temperature difference between the solar cell and inlet air temperature results in a significant entropy generation. The OTEC Rankine cycle exhibits the next largest exergy destruction, mainly due to the temperature 188PDF Image | Energy Systems for Multigeneration Purposes
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