The Economic Impact of Privatization and Commercialization of Public Enterprises in Nigeria (a Case Study of Power Holding (Nepa) Plc
DESIGN ANALYSIS
A. Determination of the capacity of the Hopper
The hopper is a truncated square pyramid which serves as the input unit, so it was designed to provide smooth supply of moringa leaves into the pulverizing chamber.
Considering AMB,
EMAM=h260+h
30160=h260+h h=60mm therefore the total height H=60+260=320mm.
Volume of hopper=volume of large pyramid – volume of small pyramid Volume of pyramid=1/3[a2H- b2h]
Where a=320mm, b=60mm
Volume = 1/3[(3202x320)- (602)(60)] = 10850667mm3
B. Determination of pulley diameter
Using;
speed of the drivenspeed of the driver=diameter of driverdiameter of the driven
N1N2=D2D1
Where N1=Electric motor speed, N2=Machine speed D1= Diameter of driver pulley, D2= Diameter of driven pulley
For a horsepower of 1Hp which gives 1400rpm
Where N1 = 1400rpm, N2 = 650rpm, D1= 650mm, D2 =
D2=N1D1N2=140mm
Therefore , transmission ratio=D2/D1=140/65=2.15 Ratio=1:2
C. DETERMINATION OF BELT LENGTH
CENTRE DISTANCE OF THE PULLEY
Using, C=D1+D22+D1……..(Khurmi and Gypta,2005)
C=65+1402+65=167.5mm
Therefore the centre distance of the pulley is C=167.5mm.
DETERMINATION OF THE LENGTH OF BELT
Using , L=2C+1.57(D+ d)+(D-d)24C
Where L= length of the belt (to be determined) C=centre distance between the two pulley
L = 2(167.5) +1.57(65+140) + (65-140)24(167.5)
Therefore, Length of belt = 665.24mm=66.5cm
DETERMINATION OF BELT SPEED Using , V=ΠDN
Where V= speed of belt(ms-1) D= diameter of the driver pulley(mm) N= Number of revolution per minute(rpm)
(Assuming the machine was operated at 90% maximum speed)
Actual speed =1400x0.9=1260rpm
V=Πx0.65x126060= 4.28 ms-1
SELECTION OF BELT
1 horse power (Hp) =0.768Kw
Therefore for 1Hp =1×0.746= 0.746Kw
From the standard table, service factor =1.2
Design horsepower = rated power x service factor = 1 x 1.2 =1.2Hp
Actual design power rating = rated horse power x service factor x 0.746 = 1.2 x 0.746 =0.895Kw
Hence, for a 1Hp and
A. Determination of the capacity of the Hopper
The hopper is a truncated square pyramid which serves as the input unit, so it was designed to provide smooth supply of moringa leaves into the pulverizing chamber.
Considering AMB,
EMAM=h260+h
30160=h260+h h=60mm therefore the total height H=60+260=320mm.
Volume of hopper=volume of large pyramid – volume of small pyramid Volume of pyramid=1/3[a2H- b2h]
Where a=320mm, b=60mm
Volume = 1/3[(3202x320)- (602)(60)] = 10850667mm3
B. Determination of pulley diameter
Using;
speed of the drivenspeed of the driver=diameter of driverdiameter of the driven
N1N2=D2D1
Where N1=Electric motor speed, N2=Machine speed D1= Diameter of driver pulley, D2= Diameter of driven pulley
For a horsepower of 1Hp which gives 1400rpm
Where N1 = 1400rpm, N2 = 650rpm, D1= 650mm, D2 =
D2=N1D1N2=140mm
Therefore , transmission ratio=D2/D1=140/65=2.15 Ratio=1:2
C. DETERMINATION OF BELT LENGTH
CENTRE DISTANCE OF THE PULLEY
Using, C=D1+D22+D1……..(Khurmi and Gypta,2005)
C=65+1402+65=167.5mm
Therefore the centre distance of the pulley is C=167.5mm.
DETERMINATION OF THE LENGTH OF BELT
Using , L=2C+1.57(D+ d)+(D-d)24C
Where L= length of the belt (to be determined) C=centre distance between the two pulley
L = 2(167.5) +1.57(65+140) + (65-140)24(167.5)
Therefore, Length of belt = 665.24mm=66.5cm
DETERMINATION OF BELT SPEED Using , V=ΠDN
Where V= speed of belt(ms-1) D= diameter of the driver pulley(mm) N= Number of revolution per minute(rpm)
(Assuming the machine was operated at 90% maximum speed)
Actual speed =1400x0.9=1260rpm
V=Πx0.65x126060= 4.28 ms-1
SELECTION OF BELT
1 horse power (Hp) =0.768Kw
Therefore for 1Hp =1×0.746= 0.746Kw
From the standard table, service factor =1.2
Design horsepower = rated power x service factor = 1 x 1.2 =1.2Hp
Actual design power rating = rated horse power x service factor x 0.746 = 1.2 x 0.746 =0.895Kw
Hence, for a 1Hp and