ClueLuma

Hot-water sensible energy calculator

Water specific heat is approximately one Btu per pound-degree Fahrenheit in this sensible-storage estimate.

Units
E=m×dTE = m \times \mathit{dT}

Calculator

Enter the values you know and leave one box empty. Calculate finds the empty one, the result or any input.

lb
Δ°F
Btu

Worked example

Given

  • mm = 25,000 lb
  • dT\mathit{dT} = 30 Δ°F
E=25,000×30=750,000E = 25{,}000 \times 30 = 750{,}000

Symbols and units

SymbolMeaningUnit
EEstored useful heatBtu
mmwater masslb
dT\mathit{dT}usable cooling of hot waterΔ°F

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Results are estimates for study and screening. Check the inputs, units and assumptions before you use them for design, billing or contract decisions.