1. Double Pipe Heat Exchanger Jan. 22, 2003

2. Today’s Lecture Lab Teams and Schedules Double Pipe Heat Exchanger

3. Lab Teams and Schedules

4. Heat Exchanger Double Pipe Heat Exchanger Hot Cold

5. Two Types of Flow Counter-Current Hot stream enters near cold stream exit Co-Current or Parallel Hot stream and cold stream enter near each other, and exit near each other.

6. Counter-Current Flow T H,in T C,out T H,out T C,in T2T2 T1T1

7. Parallel Flow T H,in T C,in T H,out T C,out T2T2 T1T1

8. Heat Balance Cold Balance Hot Balance

9. Heat Balance Overall Heat Transfer

10. Experimental Plan Hot water in center, opposite of lecture schematic Cold water in annular region Set hot water for parallel or countercurrent flow Read temperatures and flow rates Three readings per rate Five flows for each configuration

11. Data Analysis Calculate q c and q h. Compare. Calculate U. Calculate Error in U. Plot U vs. Re

12. Questions to Address: Which configuration was more efficient? How do these results compare with literature? Compare thermometer readings to thermocouple readings, and their effect on the error in U.