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Editor: KeithLofstrom
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Size: 360
Editor: KeithLofstrom
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A Bathtub of Water

  • Bathtub holds 9 cubic feet, 0.25 cubic meters, 250 kilograms

  • person displaces 50 kg? -> 200 kg of heated water

  • Inlet water 10C, tub water 40C

  • 30C * 2e5 g * 4.184 J/calorie -> 25 MJ

  • Gas is $1 per therm, or $1 per 63 MJ at 60% heating efficiency
  • $0.40 per full bathtub, $160/year for a bath every night

Bathtub (last edited 2016-04-29 05:31:00 by KeithLofstrom)