Conversions and Formulas

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.

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Copyright ? 2017 American Industrial Heat Transfer, Inc. 355 American Industrial Drive LaCrosse, VA 23950 tel: 434-757-1800 fax: 434-757-1810 email: sales@

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