Energy Systems for Multigeneration Purposes

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

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Here, m g is the gas turbine mass flow rate, which is calculated as ̇ ̇ ̇ The net output power can be expressed as ̇̇̇ where Cpg is taken to be a function of temperature as follows: () ()()() 5.5.1.2 Bottoming cycle (5.31) (5.32) (5.33) Energy balances and governing equations for the components of the bottoming cycle (steam turbine cycle and HRSG) are provided here.  Dual pressure HRSG A dual-pressure HRSG with two economizers (LP and HP) and two evaporators (LP and HP) is used in the multigeneration cycle to provide both low- and high-pressure steam. The LP steam is used to drive the absorption chiller and the HP steam to generate electricity. The temperature profile in the HRSG is shown in Fig. 5.3, where the pinch-point is defined as the difference between the temperature of the gas at the entrance of the evaporator (economizer side) and the saturation temperature. The dual-pressure HRSG has two pinch points (PPHP and PPLP). The temperature differences between the water leaving the economizers (T20 and T22) and the saturation temperature (T5 and T17) are the approach points (APHP and APLP), which depend on the economizer’s tube layout. Note that the pinch point and approach temperatures are considered constant here. Energy balances for each element of the HRSG are expressed as follows: ̇()̇() ̇()̇() ̇()̇() ̇()̇() (5.34) (5.35) (5.36) (5.37) 70

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Energy Systems for Multigeneration Purposes

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