Monday, 11 April 2011

ENERGY BALANCE AROUND PREHEATER


Energy Input:
Enthalpy of feed entering Preheater       =5*107 KJ/hr
Enthalpy of steam entering                     =3.5*107 KJ/hr
Energy input                                         = Enthalpy of feed        +          Enthalpy of steam entering
                                                                entering Preheater
                                                            = 5*107                               +          3.5*10
= 8.5*107 KJ/hr
Energy Output:
Enthalpy of feed leaving                        = Wf Cp ΔT
QFeed                                                                      = [(497.4)(96.5) + (5968.8)(75.276)] * (195-25)
= 84542103 KJ
Energy output                                       = 8.5*107 KJ/hr

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