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 TH,in T1 TC,out TH,out T2 TC,in

7. Parallel Flow TH,in TH,out T1 T2 TC,out TC,in

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 qc and qh. 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.