Double Pipe Heat Exchanger Jan. 22, 2003

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

Lab Teams and Schedules

Heat Exchanger Double Pipe Heat Exchanger Hot Cold

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.

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

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

Heat Balance Cold Balance Hot Balance

Heat Balance Overall Heat Transfer

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

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

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.