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Homework Help: Thermodynamics swimming pool question

  1. May 1, 2010 #1
    1. The problem statement, all variables and given/known data

    You are asked to design a heating system for a swimming
    pool that is 2 m deep, 25 m long, and 25 m wide. Your
    client desires that the heating system be large enough to raise
    the water temperature from 20°C to 30°C in 3 h. The rate of
    heat loss from the water to the air at the outdoor design conditions
    is determined to be 960 W/m2, and the heater must also
    be able to maintain the pool at 30°C at those conditions. Heat
    losses to the ground are expected to be small and can be disregarded.
    The heater considered is a natural gas furnace whose
    efficiency is 80 percent. What heater size (in Btu/h input)
    would you recommend to your client?


    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. May 1, 2010 #2

    jack action

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    Gold Member

    Ewater = m * cp * T

    P = E / t

    Pneeded = Pheated + Plosses
     
  4. May 2, 2010 #3
    Do i calculate the Energy at each temperature then take the difference?
     
  5. May 2, 2010 #4

    jack action

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    Science Advisor
    Gold Member

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