Units of Energy

Use for any unit conversions that may be necessary for utility comparisons or economic calculations

• 1 Btu/h = 0.2931 watt
• 1 gallon = 8.346 lb of water (680 F.)
• 1 horsepower = 0.7457 kilowatt = 42.41 Btu/min
• 1 Kilowatt-hour = 3413 Btu = 1,000 watt-hours
• 1 Ton = 12,000 Btu/hr
• 1 watt = 3.412 Btu/hr

Energy Formulas

• Tons = GPM (water) x Δt / 24
• Tons = CFM (air) x Δh / 2700
• Total Heat (Btu/hr) = 500 x GPM (water) x Δt
• Total Heat (Btu/hr) = 4.5 x CFM (air) x Δh
• Sensible Heat (Btu/hr) = 1.08 x CFM (air) x Δt
• Latent Heat (Btu/hr) = 0.68 x CFM (air) x Δw

source: Harvard School of Publich Health

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