1 SYSTEM SIMULATION SYSTEM SIMULATION System simulation is a calculation System simulation is a calculation step for finding out the output when step for finding out the output when the input parameters are changed. the input parameters are changed. With the results the designer could With the results the designer could make a decision on the appropriate make a decision on the appropriate size or design before making a size or design before making a prototype or real systems. prototype or real systems.
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SYSTEM SIMULATIONSYSTEM SIMULATION
System simulation is a calculation step for finding System simulation is a calculation step for finding out the output when the input parameters are out the output when the input parameters are changed. With the results the designer could make changed. With the results the designer could make a decision on the appropriate size or design before a decision on the appropriate size or design before making a prototype or real systems. making a prototype or real systems.
ff66(W(W11 , P , P11 ,P ,P2 2 )) ff33(W(W11 , P , P11 ))
ff44(W(W11 , P , P22 ,P ,P3 3 ))
ff55(W(W22 , P , P33 ,P ,P4 4 ))
ff11(W(WAA , P , P33 ))
ff22(W(WBB , P , P44 ))
ff77(W(W11 ,W ,WAA ,W ,W22 ))
ff88(W(W22 ,W ,W3 3 ))
TRIAL WTRIAL W11
TRIAL WTRIAL W22
PP33
PP44WWBB
WW22
WW11PP11WW11
WW11
WWAA
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Sequential SimulationSequential Simulation When we start with the information input of a component
in a whole system, the an output from this first component will be the input needed to calculate the output of the next component and go on to the last component.
When we start with the information input of a component in a whole system, the an output from this first component will be the input needed to calculate the output of the next component and go on to the last component.
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Simultaneous SimulationSimultaneous Simulation
The calculation is not straightforward. Two methods normally used are Successive substitution
A value or more input variables are assumed to begin to the calculation and the process is continued till the originally-assumed variable are recalculated. The iteration is finished when the convergence of the of the variable is obtained.
Newton-Raphson method.
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Example Example Cooling Tower-CondenserCooling Tower-Condenser
Q = 293.1 Q = 293.1 XX 10 1033 kW , W = 9146.6 kg/s , T kW , W = 9146.6 kg/s , Twbwb = 20 ,25 C = 20 ,25 C
Condenser :Condenser : Pc = 1.0055 x 10-5 Q + 0.34398Tcw - 5.4006 kN/m2