2. DAQ Calibration for Heat Exchanger Calibration of Cold/Hot Flow Rate and Temperature UTC ENCH/ENEV 435 11/25/03 Greg Kirton Kevin Zitzow Phuong Mai

3. Objectives  Calibrate Cold Water Flow Rates from DAQ with Measured Flow Rates  Calibrate Hot Water Flow Rates from DAQ with Measured Flow Rates  Calibrate Temperatures from DAQ with Measured Temperatures

4. Heat Exchanger in UTC Lab

5. FT=Flow Transmitter S=Solenoid TT= Temp Transmitter CW=Cold Water W/H=Water Heater CWS=Cold Water Supply CWR=Cold Water Return Schematic of Heat Exchanger

6. Procedure for Measurements  A stopwatch was used to keep time  A 1000 ml graduated cylinder was used to measure volume  Measured volume of water obtained in 10 seconds.  Varied % Opening of Cooling Water Valve % Hot Water Pump Speed  4 measurements were made for each setting

7. Data Analysis  Measurements were averaged and error was calculated using student’s T equation. http://chem.engr.utc.edu/engr329/Lab-manual/Students-T.htm  Computer DAQ was averaged and standard deviation was calculated in Excel DAQ error was reported as 2xSTDEV

8. Cold Water Flow Calibration

9. Cold Water Flow Data

11. Hot Water Flow Calibration

12. Hot Water Flow Data

14. Temperature Calibration

15. Insulation

16. Tube Side Port B Tube Side Port A Shell Side Port B Shell Side Port A

17. Temperature Data

18. Overall Heat Transfer Coefficient of Heat Exchanger

19. Objectives  Compare total heat transfer rates of the hot and cold streams.  Determine the overall heat transfer coefficient.

20. Pictures of the Heat Exchanger Hot water in Cold water in Tube bundle

21. Heat Transfer Properties  55 tubes  Tube Volume = 143 cc  Tube Length = 506 mm  Total heat transfer area = 0.27 m 2

22. Heat Transfer Diagram T hot,in T hot,out T cold,in T cold,out q

23. Log Mean Temperature

24. Heat Transfer Rate Equations

25. 1 st Run  Input = 75% Hot water mass flow rate (HWS) of 0.4124kg/s  CW valve open = 60 % Cold Water mass flow rate (CWS) of 0.080kg/s

26. q and U Results of 1 st Run  q c =5.76 kW  q h = 3.37 kW  U c = 1352 W/m 2 K  U h = 792 W/m 2 K

27. 2 nd Run  Input = 40% Hot water mass flow rate (HWS) of 0.0258 kg/s  CW valve open = 40 % Cold water mass flow rate (HWS) of 0.0505 kg/s

28. q and U Results of 2 nd Run  q c =2.33 kW  q h = 2.25 kW  U c = 532 W/m 2 K  U h = 514 W/m 2 K

29. 1). HWS = 0.04124kg/s and CWS = 0.080 kg/s 2). HWS = 0.0258 kg/s and CWS = 0.0505 kg/s 1st 2nd 1st 2nd Hot Flow Cold Flow

30. Hot Flow Cold Flow 1st 2nd 1st 1). HWS = 0.04124kg/s and CWS = 0.080 kg/s 2). HWS = 0.0258 kg/s and CWS = 0.0505 kg/s

31. Conclusions  1 st run: q c and q h are not closed.  2 nd run: q c and q h are closed.  1 st run: U c and U h are not closed.  1 st run: U c and U h are closed.  U increases as HWS and CWS increase. 1). HWS = 0.04124kg/s and CWS = 0.080 kg/s 2). HWS = 0.0258 kg/s and CWS = 0.0505 kg/s

32. Questions ?????