0.001 x Surface Area x Difference between oil and air temperature
Example: If the oil temperature is 140 degrees fahrenheit, and the air temperature is 75 degrees fahrenheit, how much heat will a reservoir with 20 square feet of surface area dissipate?
Surface Area = 20 square feet
Temperature Difference = 140ºF - 75ºF = 65ºF
0.001 x Surface Area x Temperature Difference = 0.001 x 20 x 65 = 1.3 horsepower
Heating Hydraulic Fluid Notes:
• 1 HP = 2,544 BTU per Hour
• 1 watt will raise the temperature of 1 gallon by 1ºF per hour
• Horsepower x 745.7 = watts
• Watts ÷ 1000 = kilowatts
Related information: cooling an overheated hydraulic system
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