SAMPLE OF CALCULATION :

 

a) Sample calculation for engine torque

 

Engine Torque, T = ( F₁ + F₂ )R

 

T₁ = (1.0) (0.056)

  = 0.056 Nm

 

T₂ = (2.0) (0.056)

     = 0.112 Nm

 

T₃ = (3.0) (0.056)

                 = 0.168 Nm

 

T₄ = (4.0) (0.056)

                 = 0.224 Nm

 

T₅ = (5.0) (0.056)

                 = 0.28 Nm

 

 

 

b) Sample calculation for engine break power

 

Engine Break Power, Bp = 2πNT

   60

 

Bp₁ =

                    

                   = 8.7965 KW

 

 

 

 

 

Bp₂ =

                   = 17.5929 KW

 

 

Bp₃ =

                   = 26.3894 KW

 

 

Bp₄ =

                   = 35.1858 KW

 

 

Bp₅ =

                   = 43.9823 KW

 

 

 

c) Sample calculation for steam flow rate

Steam Flow Rate (Steam Consumption Rate), m_f = flow rate x r

 

m_f1 = flow rate(condensation rate) x r

       = 100 x 10^-3 x (0.001 x 60) m³ x 1000 kg

                                                              h               m³

                  = 6.0 kg/h

 

 

 

m_f2  = 135 x 10^-3 x (0.001 x 60) m³ x 1000 kg

    h               m³

        = 8.1 kg/h

 

 

 

m_f3   = 135 x 10^-3 x (0.001 x 60) m³ x 1000 kg

                h               m³

                    = 8.1 kg/h

 

 

m_f4  = 150 x 10^-3 x (0.001 x 60) m³ x 1000 kg

                                                    h               m³

                    =  9 kg/h

 

 

m_f5  = 140 x 10^-3 x (0.001 x 60) m³ x 1000 kg

                            h               m³

                    = 8.4 kg/h

 

 

d) Sample calculation for specific steam consumption

 

Specific Steam Consumption, SSC =  m_f

                                                                  Bp

 

SSC₁ = m_f1

                        Bp₁

         =   6.0       

            8.7965

                     = 0.682 Kg/KW.h

 

 

SSC₂ = m_f2

                         Bp₂

         =    8.1

            17.5929

                     = 0.4604 Kg/KW.h

 

 

 

 

SSC₃ = m_f3

                        Bp₃

         =    8.1

            26.3894

         = 0.3069 Kg/KW.h

 

 

SSC₄ = m_f4

                        Bp₄

         =   9

            35.1858

         = 0.2558 Kg/KW.h

 

 

SSC₅ = m_f5

                        Bp₅

         =    8.4

                        43.9823

         = 0.191 Kg/KW.h