L22-Energy_Balance_Without_Reaction - Energy Balancein...

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1 Energy Balance- in Non-Reactive System
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2 LEARNING OBJECTIVES By the end of this topic, you should be able to: Performed energy balance for non reactive system
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3 ENERGY BALANCE EQUATION Generally, the energy balance equation for any process unit is given as: Input + Generation - Output - Consumption = Accumulation Enters through system boundaries Produced within system only for reactive system Leaves through system boundaries Consumed within system only for reactive system Buildup within system only for transient operation
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4 ENERGY BALANCE FOR CLOSED SYSTEMS U + E k + E p = Q – W “first law statement for a closed system” ENERGY BALANCES
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5 ENERGY BALANCES s p k W Q E E H Δ + = + + ENERGY BALANCE FOR OPEN SYSTEMS where fl s W W W - = Shaft work-rate of work done by the process fluid on moving part within the system Work flow or rate of work done by the fluid at the system outlet minus the rate of work done on the fluid at the system inlet
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6 ENERGY BALANCE PROCEDURE 1. Performed mass balance and determine all the flow rates of all stream components. It is understood that you have to draw the flowchart, take the basis of calculation and perform all the necessary mass balance so that the quantity of flow rates can be determine for each stream. In some cases, not enough information requires us to solve the mass and energy balance simultaneously. Look at example 2.
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