For energy engineers, unit conversion is the most basic of basics. In the field, there are gauge units and absolute units, so minor mistakes can lead to very different calculation results. Also, there are times when you want to verify your unit conversion.
Python code of unit converter
The Python code below is an example of temperature and pressure engineering unit conversion.
dbUnit = [
['C', 'Temperature', 1.0, 0.0],
['K', 'Temperature', 1.0, 273.15],
['F', 'Temperature', 1.8, 32.0],
['R', 'Temperature', 1.8, 491.67],
['kPa', 'Pressure', 1.0, 0.0],
['MPa', 'Pressure', 0.001, 0.0],
['bar', 'Pressure', 0.01, 0.0],
['N/m2', 'Pressure', 1000.0, 0.0],
['atm', 'Pressure', 0.009869233, 0.0],
['at', 'Pressure', 0.01019716, 0.0],
['kg/cm2', 'Pressure', 0.01019716, 0.0],
['psia', 'Pressure', 0.1450377, 0.0],
['lbf/ft2', 'Pressure', 20.88543, 0.0],
['torr', 'Pressure', 7.500615, 0.0],
['kPag', 'Pressure', 1.0, -101.325],
['MPag', 'Pressure', 0.001, -0.101325],
['bar_g', 'Pressure', 0.01, -1.01325],
['N/m2_g', 'Pressure', 1000.0, -101325.0],
['atm_g', 'Pressure', 0.009869, -1.0],
['ate', 'Pressure', 0.01019716, -1.033227],
['kg/cm2_g', 'Pressure', 0.01019716, -1.033227],
['psig', 'Pressure', 0.1450377, -14.696],
['lbf/ft2_g', 'Pressure', 20.88543, -2116.216],
['torr_g', 'Pressure', 7.500615, -760.0],
]
Run Python code below : https://www.mycompiler.io/view/8cFCBv5qrIk
def loadUnit(search):
for i in range(len(dbUnit)):
if dbUnit[i][0] == search:
UnitGroup = dbUnit[i][1]
UnitScale = float(dbUnit[i][2])
UnitOffset = float(dbUnit[i][3])
return UnitGroup, UnitScale , UnitOffset
def unitconv(number, Unit_old, Unit_new):
Group_old, Scale_old, Offset_old = loadUnit(Unit_old)
Group_new, Scale_new, Offset_new = loadUnit(Unit_new)
if Scale_old == 0 or Group_old != Group_new:
return None
return ((number - Offset_old) / Scale_old) * Scale_new + Offset_new
print(unitconv(50, "C", "R")) # 50 C = 581.67 R
print(unitconv(10, "bar_g", "kPa")) # 10 bar_g = 1101.325 kPA
