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Fluid Power Information Center
Hydraulic Thermal Formulas
Formula For: Word Formula: Letter Formula:
NOTE: One British Thermal Unit (BTU) Is The Amount Of Heat Required To Raise The Temperature Of One Pound Of Water One Degree Fahrenheit. One Horsepower = 2545 BTU/HR.
RESERVOIR COOLING CAPACITY
BASED ON ADEQUATE AIR CIRCULATION
HEAT(BTU/HR) = 2 x TEMPERATURE DIFFERENCE BETWEEN RESERVOIR WALLS AND AIR(oF) x AREA OF RESERVOIR(SQ. FT.)
BTU/HR = 2.0 x (DELTA)T x A
HEAT IN HYDRAULIC OIL(approx.)
DUE TO SYSTEM INEFFICIENCY(SG=0.89-0.092)
HEAT(BTU/HR) = FLOW RATE(GPM) x 210 x TEMPERATURE DIFFERENCE(oF)
BTU/HR = Q x 210 x (DELTA)T
HEAT IN FRESH WATER(approx.)
HEAT(BTU/HR) = FLOW RATE(GPM) x 500 x TEMPERATURE DIFFERENCE(oF)
BTU/HR = Q x 500 x (DELTA)T
HEAT IN HYDRAULIC SYSTEM DUE TO UNUSED FLOW/PRESSURE
HEAT(BTU/HR) = FLOW RATE(GPM) x 1.485 x PRESSURE DROP(PSIG)
BTU/HR = Q x 1.485 x PSIG
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