Relative centrifugal force
rcf = (11.18 x 10-6) RN
R = rotating radius in cm
N = rotation speed in rpm
| Molar (M) = | Moles of solute
Liters of solution |
| Weight % = | Grams of solute x 100%
Grams of solute + grams of solvent |
| Volume % = | Liters of solute x 100%
Liters of solution |
| ppm = | mg of solute
kg of solution | = | mg
Liters of water |
CV factor
Q = flow rate (GPM)
CV = flow coefficient
G = specific gravity
ΔP = pressure drop (psi)
Cooling capacity of chillers
| Btu/hr = | ΔT (°F) x Specific heat of fluid
flow rate (GPM) |
Specific heat of water = 500 Btu/hr/GPM/°F
Specific heat of oil = 350 Btu/hr/GPM/°F
Heating water in tanks
| kW = | Volume (gallons) x ΔT (°F)
325 x Heat-up time (hours) |
Heating oil in tanks
| kW = | Volume (gallons) x ΔT (°F)
800 x Heat-up time (hours) |
Heating flowing water
kW = Flow (GPM) x ΔT (°F) x 0.16
Absolute humidity (as g/m3)
| D = | 804
1 + 0.00633t | x | e
PO |
| D = | H
100 | x | 804
1 + 0.00633t | x | e
PO |
Dew point temperature (as °C)
| T = | 237.3/7.5 - 1
log e - 0.786 |
| eS = 6.1078 x 107.5t/(237.3 + t) |
Relative humidity (as % RH)
| RH = | e
eS | x 100 = | D
DS | x 100 |
H = relative humidity (% RH)
PO = standard air pressure (mm Hg)
D = absolute humidity (g/m3)
e = water steam pressure (mm Hg)
DS = absolute humidity in saturation (g/m3)
eS = saturated water steam pressure (mm Hg)
t = temperature (°C)
T = dew point temperature
Absolute viscosity = kinematic viscosity x density
density = units of specific gravity or g/mL
(eg. poise = stokes x g/mL)
Volts
| Volts = √Watts x Ohms = | Watts
Amperes | = Amperes x Ohms |
Amperes
| Amperes = | Volts
Ohms | = | Watts
Volts | = √ | Watts
Ohms |
Ohms
| Ohms = | Volts
Amperes | = | Volts2
Watts | = | Watts
Amperes2 |
Watts
| Watts = Volts x Amperes = Amperes2 x Ohms = | Volts2
Ohms |
