Conversions and Formulas
To Convert
Into
Multiply By
Cubic Feet (cu. ft.)
Gallons U.S. Liquid
7.48052 0.2642
Liters Per Minute (LPM) Gallons Per Minute (GPM)
Gallons Per Minute (GPM) Cubic Inches Per Minute
231
Kilowatts (Kw)
Btu / hr Btu / hr
3415 2545
Horse Power (HP)
Joules
Btu
.000948
Kilogram Calories
Btu
3.968
Kilograms
Pounds U.S. (lbs)
2.205
Degrees Celcius
Degrees Fahrenheit
(1.8) + 32
Tons of Cooling (chiller)
Btu / hr
12000
Tons of Cooling (cooling tower)
Btu / hr
18000
Gallons U.S. (water)
Pounds U.S. (lbs)
8.3453
Milimeters
Inches U.S.
25.4
Centimeters
Inches U.S.
2.54
Bar
Pounds Per Square Inch (PSI)
14.5
Inches of Water
Pounds Per Square Inch (PSI)
.03613
Inches of Mercury (Hg)
Pounds Per Square Inch (PSI)
.4912
Formula For
Word Formula
Letter Formula
Heat (Btu/hr) = 2 x Temperature Difference Between Reservoir Walls and Air ( o F) x Area of Reservoir (Sq. ft.)
Reservoir Cooling Capacity
Btu/hr = 2.0 x r T x A
Heat In Hydraulic Oil (approx.) due to system inefficiencies (SG = .89 - .92) Heat (Btu/hr) = Flow Rate (GPM) x 210 x Temperature Difference (
o F) Btu/hr Q = GPM x 210 x r T
Heat In Fresh Water (approx.) Heat In 50% Ethylene Glycol and Water (approx.)
Heat (Btu/hr) = Flow Rate (GPM) x 500 x Temperature Difference ( o F) Btu/hr Q = GPM x 500 x r T
Heat (Btu/hr) = Flow Rate (GPM) x 450 x Temperature Difference (
o F) Btu/hr Q = GPM x 450 x r T
SCFM x 1.13 x Temperature Differ- ence ( o F)
Heat In Dry Air (approx.)
Standard Cubic Feet Per Minute x 1.13 x Temperature Difference ( o F)
Pressure (PSI) x Flow (GPM) 1714
PQ 1714
Fluid Power In Horse Power
Horse Power =
HP =
.3208 x Flow Rate through I.D. (GPM) Internal Area (Square Inches)
.3208Q A
Velocity Through Piping (in feet / second velocity) Internal Area of a Pipe (square inches)
Velocity =
V =
Internal Area = Pipe I.D. squared x .7854
A = d
2 x .7854
Weight of One Cubic Foot of a Fluid Weight of One Cubic Foot of Water
W 62.4283
Specific Gravity of a Fluid
Specific Gravity =
SG =
ACFM x PSIG + 14.7 x 528 T 1 + 460 x 14.7
ACFM x (Pounds Per Square Inch Gauge + Atmospheric Pressure) x 528 (Temperature of Air Inlet + 460) x Atmospheric Pressure
Convert ACFM to SCFM
SCFM =
SCFM =
Btu per hour Enthalpy of Steam at Operating Pressure
Btu/hr Btu/lb
Steam Required (lbs / hr)
lbs / hr =
lbs/hr =
s = Horse Power to be Removed x 2545 x Correction Viscosity (Oil Leaving o F - Ambient Air Entering o F)
HP x 2545 x Cv T 2 - t a
F s or Btu / lb
o F
F
F s =
note: AIHTI reserves the right to make reasonable design changes without notice.
8
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355 American Industrial Drive LaCrosse, VA 23950
tel: 434-757-1800
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email: sales@aihti.com
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