Problemas de control de procesos
Universidad Autónoma de Nuevo León
Departamento de Ingeniería Química
Ejemplos de Sistemas de Primer Orden
Dr. Salvador Tututi Avila
Departamento de Ingeniería Química Universidad Autónoma de Nuevo León
Problema1
Asaprocessengineer,youdecidetodevelopafirst-order+timedelaymodelofaprocessusingasteptest.Theprocessisinitiallyatsteadystate,withaninputflowrateof5
andanoutputof0.75
/
.Youmakeastepincreaseof0.5gpmat3:00p.m.anddonotobserveanychangesuntil3:07p.m.At3:20p.m.,thevalueoftheoutputis0.8
/
.Youbecomedistractedanddonothaveachancetolookattheoutputvariableagain,untilyouleaveforhappyhouratalocalwateringholeat6:30p.m.Younotethattheoutputhasceasedtochangeandhasachievedanewsteady-statevalueof0.85
/
.Whatarethevaluesoftheprocessparameters,withunits?Showyourwork.
2
Departamento de Ingeniería Química Universidad Autónoma de Nuevo León
Problema2
The level in a tank responds as a first-order system with changes in the inlet flow. Given the following level versus time data that were gathered (Fig. P4–16) after the inlet flow was increased quickly from 1.5 to 4.8 gal/min,
3
Departamento de Ingeniería Química Universidad Autónoma de Nuevo León
Problema2
4