Angel Oral Presentation HE 10'03 (1)
-
Upload
raspera9602 -
Category
Documents
-
view
219 -
download
0
Transcript of Angel Oral Presentation HE 10'03 (1)
-
7/31/2019 Angel Oral Presentation HE 10'03 (1)
1/27
Shell and Tube Heat ExchangerOctober 7, 2003
Cycle 2
Group 1AFrank Fadenholz
Jennifer FadenholzChristian Woods
Angel Taylor
-
7/31/2019 Angel Oral Presentation HE 10'03 (1)
2/27
Outline
Objectives
Background
Experimental Strategy Results
Error Analysis
Conclusions Recommendations
References
-
7/31/2019 Angel Oral Presentation HE 10'03 (1)
3/27
Objectives and Background
-
7/31/2019 Angel Oral Presentation HE 10'03 (1)
4/27
Objectives
Operate shell and tube heat exchanger varyingsteam flow
Determine the outside overall heat transfercoefficient (Uo)
Determine shellside heat transfer (QSS)
Determine tubeside heat transfer (QTS)
-
7/31/2019 Angel Oral Presentation HE 10'03 (1)
5/27
Heat Exchanger Background
Exchange heat between fluids
Latent heat and sensible heat transfer
Common to chemical process industry
Types of heat exchangersAir Cooled
Double Pipe
Spiral Plate and Tube
Shell and Tube
-
7/31/2019 Angel Oral Presentation HE 10'03 (1)
6/27
Heat Exchanger Background
Shell and Tube Heat Exchangers
Account for 60% of heat exchangers in use today
Can handle large flows, low temperatures and pressures,high temperatures and pressures
Our shell and tube heat exchanger
Basco Type 500 U-tube Water Heater 1 Shell Pass 16 Tubes
-
7/31/2019 Angel Oral Presentation HE 10'03 (1)
7/27
Experimental Strategy
-
7/31/2019 Angel Oral Presentation HE 10'03 (1)
8/27
ST-V1
FT-01
EmergencyShutdown
Vavle
CompressedAir Steam
Hot Water Outlet
TT-04
TT-03
PG-07
Condensate
ColdWaterInlet
EmergencyShutdown
Valve ST-V3
PRV-05
PG-06 FT-02
E-01
Figure 1. Unit Operations Lab: Shell and Tube Heat Exchanger(Group 1A)
ST-V4
ST-V2
ST-V5
FV-02
TV-04
T
Should make Labels Larger
-
7/31/2019 Angel Oral Presentation HE 10'03 (1)
9/27
Experimental Strategy
5 Runs TotalVaried Steam Valve (TV-04) Position
105% open 75% open
65% open
60% open
52% open
Cooling water flow rate constant
-
7/31/2019 Angel Oral Presentation HE 10'03 (1)
10/27
Experimental Strategy
Measured Variables Condensate flow
Condensate temperature Cooling water flow
Cooling water inlet temperature
Cooling water outlet temperature
-
7/31/2019 Angel Oral Presentation HE 10'03 (1)
11/27
Heat Exchanger Calculations
Heat transfer rate QTS = mCpDT
QSS = mDH + mCpDT
Overall heat transfer coefficient Uo = QSS/(Ao*DTLM)
Log mean temperature DTLM = ((Thi-Tco) (Tho Tci)) / ln[(Thi Tco) (Tho Tci)]
-
7/31/2019 Angel Oral Presentation HE 10'03 (1)
12/27
Simplified Process Flow Diagram
Thi
Tho
Tci TcoQout, TSQin, TS
Qin, SS
Qout, SS
-
7/31/2019 Angel Oral Presentation HE 10'03 (1)
13/27
Results
-
7/31/2019 Angel Oral Presentation HE 10'03 (1)
14/27
Experimental Results
Steam Valve% Open
Heat Transfer
Rate (QTS)(btu/hr)
Heat Transfer
Rate (QSS)(btu/hr)
Overall HeatTransfer
Coefficient
(Uo)(btu/lb*F*hr)
105% 276489 275350 211
75% 250275 254588 201
65% 183357 181872 148
60% 134200 133777 112
52% 98289 93757 78
-
7/31/2019 Angel Oral Presentation HE 10'03 (1)
15/27
90000
140000
190000
240000
290000
75 125 175 225 275
Condensate Mass Out(lb/hr)
HateTra
nsferRate
(btu/hr)
Q-Shellside Q-Tubeside
Steam vs. Heat Transfer Rate (QTS, QSS)
-
7/31/2019 Angel Oral Presentation HE 10'03 (1)
16/27
Steam vs. Overall Heat Transfer Coefficient
50
100
150
200
250
300
50 100 150 200 250 300Condensate Mass Out (lb/hr)
HeatT
ransfer
Coefficient
(btu/lb
*F*hr)
U inside U outside
-
7/31/2019 Angel Oral Presentation HE 10'03 (1)
17/27
Error Analysis
-
7/31/2019 Angel Oral Presentation HE 10'03 (1)
18/27
Propagation of Error
Determine the accuracy of measured variables
Apply the propagation of error equation to each
function
21
1
2
DD
k
i
i
i
xxyy
-
7/31/2019 Angel Oral Presentation HE 10'03 (1)
19/27
Variable Measurement Accuracy
Flow rate of the steam +/- 5 lb/hr
Flow rate of the cooling water +/- 50 lb/hr
Temperature readings +/- 2F
Largest sources of error Mass flow rate of the steam
Mass flow rate of the cooling water
-
7/31/2019 Angel Oral Presentation HE 10'03 (1)
20/27
Calculated Error Values
QTS +/- 1,000 btu/hr
QSS +/- 50,000 btu/hr
Uo +/- 4 btu/lb F hr Ui +/- 4 to +/- 1.6 btu/lb F hr
-
7/31/2019 Angel Oral Presentation HE 10'03 (1)
21/27
Propagation of Error Heat Transfer
90000
140000190000
240000
290000
340000
75 125 175 225 275Condensate Mass Out (lb/hr)
HeatTra
nsferRate
(btu/hr)
Q-tubeside Q-shellside
-
7/31/2019 Angel Oral Presentation HE 10'03 (1)
22/27
Propagation of Error Heat TransferCoefficient
50
100
150
200
250
300
50 100 150 200 250 300Condensate Mass Out (lb/hr)
HeatT
ransfer
Coefficient
(btu/lb
*F*hr)
U inside U outside
-
7/31/2019 Angel Oral Presentation HE 10'03 (1)
23/27
Conclusionsand
Recommendations
-
7/31/2019 Angel Oral Presentation HE 10'03 (1)
24/27
Conclusions
QTS, QSS, Uo all increase as the steam flowrate increases
QTS, QSS, Uo all have a linear relationshipwith the mass flow rate of the steam
Heat transfer rate of the tube side is equalto the heat transfer rate of the shell side
-
7/31/2019 Angel Oral Presentation HE 10'03 (1)
25/27
Recommendations
Operation Recommendation Operate the shell and tube heat exchanger at
approximately 75% for sufficient heat transferand economic efficiency
Experiment Recommendations Monitor pressure gauge (PG-07) at low steamrates to prevent a vacuum
-
7/31/2019 Angel Oral Presentation HE 10'03 (1)
26/27
References
API Heat Transfer. Shell and Tube Heat Exchanger Picturewww.apiheattransfer.com/en/Products/HeatExchangers/ShellAndTube/
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.
Heald, C. C. Cameron Hydraulic Data. Liberty Corner, NJ. Ingersoll-Dresser Pump Co. 1998.
Peters, Timmerhaus, West. Plant Design and Economics forChemical Engineers, 5th ed. New York, NY. McGaw-Hill Co. Inc.,2003.
-
7/31/2019 Angel Oral Presentation HE 10'03 (1)
27/27