Ch 3. First Law of Thermodynamics th Multimedia Engineering Thermodynamics Conservationof Mass Conservationof Energy Solids andLiquids Ideal Gas
 Chapter 1. Basics 2. Pure Substances 3. First Law 4. Energy Analysis 5. Second Law 6. Entropy 7. Exergy Analysis 8. Gas Power Cyc 9. Brayton Cycle 10. Rankine Cycle Appendix Basic Math Units Thermo Tables Search eBooks Dynamics Statics Mechanics Fluids Thermodynamics Math Author(s): Meirong Huang Kurt Gramoll ©Kurt Gramoll

 THERMODYNAMICS - CASE STUDY Introduction Robert's Pond Click to View Movie (68 kB) 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