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limit environmental damage. In this way, society can reduce its use of limited resources and extend their lifetimes. Here, a sustainability index SI is used to relate exergy with environmental impact [47]: SI = 1/ DP (5.131) where DP is the depletion number, defined as the ratio of exergy destruction to input exergy. This relation demonstrates how reducing a system’s environmental impact can be achieved by reducing its exergy destruction. Also, the sustainability index is then determined as a measure of how the exergy efficiency affects sustainable development as follows: (5.132) 5.6 Analyses of system II The analyses of system II is thermodynamic analysis, exergy and exergoeconomic analysis described as follows: 5.6.1 Thermodynamic analysis The thermodynamic modeling of the multigeneration system considered in chapter 4 (Fig. 4.2) is divided into four sub-systems: 1) biomass combustor, 2) organic Rankine cycle and domestic water heater, and 3) double-effect absorption chiller and proton exchange membrane (PEM) electrolyzer 4) reverse osmosis desalination unit. We determine the temperature profile in the multigeneration plant, input and output enthalpies, exergy flows, environmental impacts, exergy destructions and exergy efficiencies. The relevant energy balances and governing equations for the main sections of the multi-generation plant shown in Fig. 4.2 are described in the following subsections. 5.6.1.1 Biomass combustion As shown in Fig. 4.2, biomass enters the combustor at point 30 and air enters at point 29. The composition of the biomass considered in this study (pine sawdust) is described in Table 5.5. The chemical equation of biomass combustion with air assuming complete combustion is: ( ) (5.133) 93PDF Image | Energy Systems for Multigeneration Purposes
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