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DAQ Calibration for Heat Exchanger Calibration of Cold/Hot Flow Rate and Temperature

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. Objectives. Calibrate Cold Water Flow Rates from DAQ with Measured Flow Rates

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DAQ Calibration for Heat Exchanger Calibration of Cold/Hot Flow Rate and Temperature

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  1. DAQ Calibration for Heat ExchangerCalibration of Cold/Hot Flow Rateand Temperature UTCENCH/ENEV 43511/25/03 Greg Kirton Kevin Zitzow Phuong Mai

  2. 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

  3. Heat Exchanger in UTC Lab

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

  5. 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

  6. 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

  7. Cold Water Flow Calibration

  8. Cold Water Flow Data

  9. Hot Water Flow Calibration

  10. Hot Water Flow Data

  11. Temperature Calibration

  12. Insulation

  13. Tube Side Port A Shell Side Port A Shell Side Port B Tube Side Port B

  14. Temperature Data

  15. Overall Heat Transfer Coefficient of Heat Exchanger

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

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

  18. Heat Transfer Properties • 55 tubes • Tube Volume = 143 cc • Tube Length = 506 mm • Total heat transfer area = 0.27 m2

  19. Heat Transfer Diagram Thot,out Thot,in q Tcold,in Tcold,out

  20. Log Mean Temperature

  21. Heat Transfer Rate Equations

  22. 1st 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

  23. q and U Results of 1st Run • qc =5.76 kW • qh = 3.37 kW • Uc = 1352 W/m2K • Uh= 792 W/m2K

  24. 2nd 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

  25. q and U Results of 2nd Run • qc =2.33 kW • qh = 2.25 kW • Uc = 532 W/m2K • Uh= 514 W/m2K

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

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

  28. Conclusions • 1st run: qc and qh are not closed. • 2nd run: qc and qh are closed. • 1st run: Uc and Uh are not closed. • 1st run: Uc and Uh 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

  29. Questions ?????

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