Tech Tools
Calculate Temperature Change
RECIRCULATING SYSTEM DELTA T in °C GIVEN GALLONS OF WATER, POWER AVAILABLE, & TIME IN MINUTES This calculates the temperature change (in degrees centigrade), given the power available (in kilowatts), the heat up time (in minutes), and a given volume of water (in gallons).
RECIRCULATING SYSTEM TIME GIVEN GALLONS OF WATER, POWER AVAILABLE, & DELTA T in °F This calculates the heat up time (in minutes), given the volume of water (in gallons), the temperature change required (in degrees Fahrenheit), and the power available (in kilowatts).
Definitions
Common Abbreviations
- KW = Killowatts
- Gal = Gallons
- in = Inches
- SpH = Specific Heat of Solution
(Water = 1 calorie/gram) - SpW = Specific Weight of solution
(Water = 8.337 lbs/gal) - T°F = Change in temperature, degrees Fahrenheit
- T°C = Change in temperature, degrees Centigrade
- Min = Heatup time in minutes
Common Equivalents
- 1 in = 2.54 cm = 25.4 mm = 0.083ft
- 1 cm = 0.3937 in = 0.0328 ft.
- 1 in³= 16.39 cm³
- 1 BTU = 0.2933 watt-hrs
- 1 KW-Hr = 3412 BTU
Properties Of Water
- 1 gallon = 231 in³ = 0.1337 ft³ = 3.785L
- 1 gallon = 8.337 lbs.
- 1 ft³ = 62.4 lbs. (at 20°C)
- specific heat = 1 calorie/gram-°C (at 15°C)
- specific heat = 1 BTU/lb.-°F (at 15°C)
- specific weight = 8.337 lbs./gallon heat of vaporization = 965 BTU/lb.
Ohm's Laws
- Volts = Amperes x Ohms
- Watts = (Amperes)² x Ohms
- Amperes = Watts / Volts
- Amperes/Phase = (Watts / Volts) x 0.578 (Assuming Balanced 3-Phase Load)
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