Download presentation

Presentation is loading. Please wait.

Published byJeanette Scotton Modified over 2 years ago

1
Shell and Tube Heat Exchanger October 7, 2003 Cycle 2 Group 1A Frank Fadenholz Jennifer Fadenholz Christian Woods Angel Taylor

2
Outline Objectives Objectives Background Background Experimental Strategy Experimental Strategy Results Results Error Analysis Error Analysis Conclusions Conclusions Recommendations Recommendations References References

3
Objectives and Background

4
Objectives Operate shell and tube heat exchanger varying steam flow Operate shell and tube heat exchanger varying steam flow Determine the outside overall heat transfer coefficient (U o ) Determine the outside overall heat transfer coefficient (U o ) Determine shellside heat transfer (Q SS ) Determine shellside heat transfer (Q SS ) Determine tubeside heat transfer (Q TS ) Determine tubeside heat transfer (Q TS )

5
Heat Exchanger Background Exchange heat between fluids Exchange heat between fluids Latent heat and sensible heat transfer Latent heat and sensible heat transfer Common to chemical process industry Common to chemical process industry Types of heat exchangers Types of heat exchangers –Air Cooled –Double Pipe –Spiral Plate and Tube –Shell and Tube

6
Heat Exchanger Background Shell and Tube Heat Exchangers Account for 60% of heat exchangers in use today Account for 60% of heat exchangers in use today Can handle large flows, low temperatures and pressures, high temperatures and pressures Can handle large flows, low temperatures and pressures, high temperatures and pressures Our shell and tube heat exchanger Our shell and tube heat exchanger –Basco Type 500 U-tube Water Heater –1 Shell Pass –16 Tubes

7
Experimental Strategy

8
Should make Labels Larger

9
Experimental Strategy 5 Runs Total 5 Runs Total Varied Steam Valve (TV-04) Position Varied Steam Valve (TV-04) Position –105% open –75% open –65% open –60% open –52% open Cooling water flow rate constant Cooling water flow rate constant

10
Experimental Strategy Measured Variables Measured Variables –Condensate flow –Condensate temperature –Cooling water flow –Cooling water inlet temperature –Cooling water outlet temperature

11
Heat Exchanger Calculations Heat transfer rate Heat transfer rate Q TS = mCp T Q SS = m H + mCp T Overall heat transfer coefficient Overall heat transfer coefficient U o = Q SS /(A o * T LM ) Log mean temperature T LM = ((T hi -T co ) – (T ho – T ci )) / ln[(T hi – T co ) – (T ho – T ci )]

12
Simplified Process Flow Diagram T hi T ho T ci T co Q out, TS Q in, TS Q in, SS Q out, SS

13
Results

14
Experimental Results Steam Valve % Open Heat Transfer Rate (Q TS ) (btu/hr) Heat Transfer Rate (Q SS ) (btu/hr) Overall Heat Transfer Coefficient (U o ) (btu/lb*F*hr) 105%276489275350211 75%250275254588201 65%183357181872148 60%134200133777112 52%982899375778

15
Shellside vs. Tubeside Heat Transfer

16
Steam vs. Heat Transfer Rate (Q TS, Q SS )

17
Steam vs. Overall Heat Transfer Coefficient

18
Error Analysis

19
Propagation of Error Determine the accuracy of measured variables Determine the accuracy of measured variables Apply the propagation of error equation to each function Apply the propagation of error equation to each function

20
Variable Measurement Accuracy Flow rate of the steam +/- 5 lb/hr Flow rate of the steam +/- 5 lb/hr Flow rate of the cooling water +/- 50 lb/hr Flow rate of the cooling water +/- 50 lb/hr Temperature readings +/- 2 °F Temperature readings +/- 2 °F Largest sources of error Largest sources of error –Mass flow rate of the steam –Mass flow rate of the cooling water

21
Calculated Error Values ∆Q TS ≈ +/- 1,000 btu/hr ∆Q TS ≈ +/- 1,000 btu/hr ∆Q SS ≈ +/- 50,000 btu/hr ∆Q SS ≈ +/- 50,000 btu/hr ∆U o ≈ +/- 4 btu/lb °F hr ∆U o ≈ +/- 4 btu/lb °F hr ∆U i ≈ +/- 4 to +/- 1.6 btu/lb °F hr ∆U i ≈ +/- 4 to +/- 1.6 btu/lb °F hr

22
Propagation of Error Heat Transfer

23
Propagation of Error Heat Transfer Coefficient

24
Conclusions and Recommendations

25
Conclusions Q TS, Q SS, U o all increase as the steam flow rate increases Q TS, Q SS, U o all increase as the steam flow rate increases Q TS, Q SS, U o all have a linear relationship with the mass flow rate of the steam Q TS, Q SS, U o all have a linear relationship with the mass flow rate of the steam Heat transfer rate of the tube side is equal to the heat transfer rate of the shell side Heat transfer rate of the tube side is equal to the heat transfer rate of the shell side

26
Recommendations Operation Recommendation Operation Recommendation –Operate the shell and tube heat exchanger at approximately 75% for sufficient heat transfer and economic efficiency Experiment Recommendations Experiment Recommendations –Monitor pressure gauge (PG-07) at low steam rates to prevent a vacuum

27
References API Heat Transfer. Shell and Tube Heat Exchanger Picture API Heat Transfer. Shell and Tube Heat Exchanger Picture www.apiheattransfer.com/en/Products/HeatExchangers/ShellAndTu be/ Georgia Tech. Propagation of Error. www.swiki.che.gatech.edu/CHE4200. August 2002. Georgia Tech. Propagation of Error. www.swiki.che.gatech.edu/CHE4200. August 2002. Geankoplis, Christie J. Transport Processes and Unit Operations, 3rd ed. Englewood Cliffs, NJ. Prentice-Hall Publishing, Inc. 1993. Geankoplis, Christie J. Transport Processes and Unit Operations, 3rd ed. Englewood Cliffs, NJ. Prentice-Hall Publishing, Inc. 1993. Heald, C. C. Cameron Hydraulic Data. Liberty Corner, NJ. Ingersoll- Dresser Pump Co. 1998. Heald, C. C. Cameron Hydraulic Data. Liberty Corner, NJ. Ingersoll- Dresser Pump Co. 1998. Peters, Timmerhaus, West. Plant Design and Economics for Chemical Engineers, 5th ed. New York, NY. McGaw-Hill Co. Inc., 2003. Peters, Timmerhaus, West. Plant Design and Economics for Chemical Engineers, 5th ed. New York, NY. McGaw-Hill Co. Inc., 2003.

Similar presentations

OK

Date of download: 6/23/2016 Copyright © ASME. All rights reserved. From: Heat Transfer and Pressure Drop Analysis of Chilled Water and Ice Slurry in a.

Date of download: 6/23/2016 Copyright © ASME. All rights reserved. From: Heat Transfer and Pressure Drop Analysis of Chilled Water and Ice Slurry in a.

© 2017 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Ppt on cell organelles and their functions Ppt on interest rate swaps Ppt on special types of chromosomes in the karyotype Ppt on index numbers line Ppt on all windows operating system Ppt on diode transistor logic circuits Ppt on viruses and bacteria youtube Ppt on save the tiger project Download ppt on transportation in human beings Ppt on plants and trees