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*10⁷ 

= 8.5*10⁷ KJ/hr

Energy Output:

Enthalpy of feed leaving                        = W_f C_p ΔT

Q_Feed                                                                      = [(497.4)(96.5) + (5968.8)(75.276)] * (195-25)

= 84542103 KJ

Energy output                                       = 8.5*10⁷ KJ/hr