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THERMODYNAMICS - CASE STUDY

    Introduction


Robert's Pond
 

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