SAMPLE OF CALCULATION

 

At test 1:          Water Height = 0.053 mm

Pump Speed = 50 %

RPM = 1400 = 146.61 rad/s

 

 

Pump Head:

 

hp = (p2 – p1)/ρg

                 = [48.28×10³-519.93] / (1000) (9.81)

                 = 4.87m

 

Brake Horsepower:

 

Wshaft = Tω

              = 0.9 × 146.61

              = 131.95 hp

 

Power:

 

Pf = ρgQhp

                  = (1000) (9.81) (0.92 ×10ֿ³) (4.87)

                = 43.95 watt

 

Pump Overall Efficiency:

 

       η   = Pf / Wshaft      x 100

                        = (43.95 / 131.95) x 100

                                    = 33.31 %