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Various units and their relationship used in power plant


Energy Conversion :    1HP(Horse power) = 746 Watts = 0.746 Kilo Watts

1 Joule = 1 watt-second

1 kWh = 1000 watts × 3600 seconds = 36 × 105 joules =3,412 Btu = 860 kcal = 1Unit of electricity

1 Watt = 3.412 Btu/hour

1 Calorie = 4.184 Joules

1 kcal/Kg = 1.8 Btu’s/lb.

1 Btu = 252 Calories = 1,055 Joules

1 Million Btu = 293.1 kWh

1 Btu/lb. = 2.3260000 kJ/kg = 0.5559 Kilocalories/kg

1Chu ( Centigrade Heat Unit)= 1.8Btu = 1899 joules

1 Therm = 10,54,80,400 joules  = 100,000 Btu (British Thermal Units)

 

Mass Conversion :        1 kgf (kilogram-force )= 9.8 N (Newtons)

1 lb = 0.45359237 kg

1 kg = 1000g = 2.20462262 lb

 

Pressure Conversion : 1 bar =  105 Pa(Pascal)  =  1.01 kg/cm2 =  14.50 psi(pounds per square)

1 kg/cm2  =  0.98 bar =  980.665 mbar (milli bar) =  98.06 kPa = 0.098 MPa

     =  10000 mmwc (mm of water column)

     =  735.56 mm-Hg  =  29 in-Hg

                          =  14.22 psi (lb/in2)

 1 atm(atmospheric pressure) =1.033kg/cm2 = 1.012bar

 

Temperature Conversion : Centigrade degrees = (5/9) X (Fahrenheit degrees - 32)

   Fahrenheit degrees = (9/5) X (Centigrade degrees) + 32

   Kelvin degrees = Centigrade degrees + 273

 

Volume Conversion : 1 gallon = 3.78541 litre

       1 m3  = 1000 litre

 

Length Conversion :    1 meter = 100 cm = 3.28084 feet = 1.09361 yard = 39.3701 inch

1 foot = 12 inch

1 yard = 36 inch = 3 feet

               1 inch = 2.54 cm 

1 mile = 1609.34 meter

 

Multipliers :    Mega = 106

Giga = 109

Tera = 1012

Centi = 10-2

Milli = 10-3

Micro =10-6

Nano = 10-9

Pico = 10-12

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