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5.6.3.1 Investment cost of a biomass based multigeneration system Biomass based multigeneration system shown in Fig 4.2 has some similar parts as the first multigeneration system. Here, the cost functions of the ones that differ from the first system are provided. 5.6.3.1.1 Biomass combustor and evaporator The cost function of biomass combustor and evaporator is a function of flue gas energy leaving the combustor, main pressure and temperature of the ORC cycle. The purchase cost function can be expressed as follows [79]: where Here, ̇ ̇ () () ( )( ) (5.213) (5.214) is the flue gas mass flow rate in kg/s. 5.6.3.1.2 Heating process unit Several cost functions are available for the heating process considered for this biomass based multigeneration system. The cost function of heating process here is defined as [103]: () ̇ (5.215) 5.6.3.1.3 Reverse osmosis (RO) desalination unit In this biomass based multigeneration, a RO desalination unit is considered as already discussed. The cost of RO desalination unit can be expressed as follows [108]: ( ) (5.216) where m is the fresh water mass in kg. 5.7 Analyses of system III 5.7.1 Thermodynamic analyses An OTEC system utilizes low-grade energy and has low energy efficiency (about 3–5%). Therefore, achieving a high electricity generating capacity with OTEC requires the use of large quantities of seawater and a correspondingly large amount of pumping energy. For thermodynamic modeling purposes, the integrated OTEC system for hydrogen production 104PDF Image | Energy Systems for Multigeneration Purposes
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