Energy Systems for Multigeneration Purposes

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Energy Systems for Multigeneration Purposes ( energy-systems-multigeneration-purposes )

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̇ The hot gases leaving the evaporator enter the water heater and heat domestic hot water to 60 0C. Water enters this heater at a pressure and a temperature of 2 bar and 20 0C, respectively. An energy balance for this component follows: ̇( )̇( ) (5.149) 5.6.1.4 Double-effect absorption chiller Absorption chillers can be used for air conditioning and cooling purposes. Compared to the more conventional vapor-compression refrigeration systems, absorption refrigeration systems replace the electricity consumption associated with vapor compression by a thermally driven system. This is accomplished by making use of absorption and desorption processes that employ a suitable working pair (a refrigerant and an absorbent). LiBr-water is a common working fluid for absorption systems in various cooling applications, including use in multi-generation systems. The LiBr-water mixture is heated in the generator as shown in Fig. 4.2. Heat provided by saturated water vapor via the heating process unit (point 24 in Fig. 4.2) allows separation of the refrigerant (H2O) from the absorbent (LiBr solution).To model the LiBr-water absorption system used in this multigeneration system, the principle of mass conservation and the first and second laws of thermodynamics are applied to each component of the single-effect LiBr-water absorption chiller. In our analysis, each component is considered as a control volume with inlet and outlet streams, and heat and work interactions are considered. Mass balances are applied for the total mass and each material of the working fluid solution. ̇( ) (5.148) 5.6.1.3 Domestic Water Heater  For absorber Mass balance equation for absorber can be written as ̇ ̇ ̇ Concentration balance equation for absorber is as ̇ ̇ Energy balance equation for absorber is expressed as ̇ ̇ ̇ ̇ (5.150) (5.151) (5.152) 96

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Energy Systems for Multigeneration Purposes

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