Conversions and Formulas
[Pages:1]Conversions and Formulas
To Convert
Cubic Feet (cu. ft.) Liters Per Minute (LPM) Gallons Per Minute (GPM) Kilowatts (Kw) Horse Power (HP) Joules Kilogram Calories Kilograms Degrees Celcius Tons of Cooling (chiller) Tons of Cooling (cooling tower) Gallons U.S. (water) Milimeters Centimeters
Bar Inches of Water Inches of Mercury (Hg)
Into
Gallons U.S. Liquid Gallons Per Minute (GPM) Cubic Inches Per Minute Btu / hr Btu / hr Btu Btu Pounds U.S. (lbs) Degrees Fahrenheit Btu / hr Btu / hr Pounds U.S. (lbs) Inches U.S. Inches U.S.
Pounds Per Square Inch (PSI) Pounds Per Square Inch (PSI) Pounds Per Square Inch (PSI)
Multiply By
7.48052 0.2642
231 3415 2545 .000948 3.968 2.205 (1.8) + 32 12000 18000 8.3453 25.4 2.54
14.5 .03613 .4912
Formula For
Reservoir Cooling Capacity
Heat In Hydraulic Oil (approx.) due to system inefficiencies (SG = .89 - .92) Heat In Fresh Water (approx.) Heat In 50% Ethylene Glycol and Water (approx.)
Heat In Dry Air (approx.)
Fluid Power In Horse Power
Velocity Through Piping (in feet / second velocity) Internal Area of a Pipe (square inches)
Specific Gravity of a Fluid
Convert ACFM to SCFM
Steam Required (lbs / hr)
Word Formula
Heat (Btu/hr) = 2 x Temperature Difference Between Reservoir Walls and Air (oF) x Area of Reservoir (Sq. ft.)
Letter Formula
Btu/hr = 2.0 x rT x A
Heat (Btu/hr) = Flow Rate (GPM) x 210 x Temperature Difference (oF) Btu/hr Q = GPM x 210 x rT
Heat (Btu/hr) = Flow Rate (GPM) x 500 x Temperature Difference (oF) Btu/hr Q = GPM x 500 x rT
Heat (Btu/hr) = Flow Rate (GPM) x 450 x Temperature Difference (oF) Btu/hr Q = GPM x 450 x rT
Standard Cubic Feet Per Minute x 1.13 x Temperature Difference (oF)
Horse Power =
Pressure (PSI) x Flow (GPM) 1714
.3208 x Flow Rate through I.D. (GPM) Velocity =
Internal Area (Square Inches)
SCFM x 1.13 x Temperature Difference (oF)
HP =
PQ 1714
.3208Q V =
A
Internal Area = Pipe I.D. squared x .7854
A = d2 x .7854
Weight of One Cubic Foot of a Fluid Specific Gravity =
Weight of One Cubic Foot of Water
ACFM x (Pounds Per Square Inch Gauge + Atmospheric Pressure) x 528
SCFM =
(Temperature of Air Inlet + 460) x Atmospheric Pressure
Btu per hour lbs / hr =
Enthalpy of Steam at Operating Pressure
W SG =
62.4283 ACFM x PSIG + 14.7 x 528
SCFM = T1 + 460 x 14.7
Btu/hr lbs/hr =
Btu/lb
Fs or Btu / lb oF
Horse Power to be Removed x 2545 x Correction Viscosity
Fs =
(Oil Leaving oF - Ambient Air Entering oF)
HP x 2545 x Cv
Fs =
T2 - ta
note: AIHTI reserves the right to make reasonable design changes without notice.
8
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