1. Problem Solving
An engineer wants to use a diesel engine to run a pump that pumps 18,000 gallons of water per hour into a tank that is 65 feet above the pump. How big an engine should the engineer specify?
Engr 0012 (04-1) LecNotes 02-01

2. Solution Structure » % solution to inclass lecture problem
» % determine power requirement (SI units)
» % for pump to lift 65,000 gal/h 65 ft
» % your name
» % class info (Engr0012, Fall Term, ...)
» % date
» % your address
» % conversion factors
» gal_to_m3 = % m^3/gal
» more conversion factors)
» % parameters (constant, in SI units)
» g = 9.8 % m/s^2
» (any additional parmameters)
Engr 0012 (04-1) LecNotes 02-02

3. Solution Structure » » % knowns (in SI units)
» vol_per_s = 65000*gal_to_m3/h_to_s % m/s^2
» (any additional knowns)
» % supporting calculations equations (in SI units)
» mass_per_s = density*vol_per_s % kg/s
» (any additional equations)
» % ANSWER: pump power requirement (in Watts)
» pump_power = force_per_s*distance % W
Engr 0012 (04-1) LecNotes 02-03

4. Problem Solving
1. Clearly identify what will result if you are successful
2. Identify a calculation route backward from the end product to the knowns
3. Identify needed (constant) parameters
4. Identify needed conversion factors
5. Determine solution by working backward: 4,3,2,1
Annotate your solution (use comments)
Engr 0012 (04-1) LecNotes 02-04

5. Turn in diary file showing solution to Exercise 1.
Class Activity
Workshop 02
Turn in diary file showing solution to
Exercise 1.
Workshop 03
Turn in diary file showing solutions to
Exercise 2a, b.
Engr 0012 (04-1) LecNotes 02-5