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THERMODYNAMICS - CASE STUDY

    Introduction


Robert's Pond
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Robert has bought some land, and plans to plant vegetable which will need to be watered everyday in the summer. The water used to irrigate the land is from a well. A pond is needed to store the water. He has an old pump which has a volume flow rate of 20 L/s.

Known:

  • Robert will plant 45 acres of vegetables. It is estimated that each acre needs 2,000 liters of water per day.
   
    Questions


 
  • How big is the pond?
  • Determine how long the pump will be operated daily.
     
    Approach


Consider the Pond as a System

 
  • Consider the water in the pond as a system.
  • The water stored in the pond equals Δmsystem of the filling process.
  • At 30 oC and 1 atm, ρwater = 996 kg/m3