daq calibration for heat exchanger calibration of cold/hot flow rate and temperature
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
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DAQ Calibration for Heat Exchanger
Calibration of Cold/Hot Flow Rateand Temperature
UTCENCH/ENEV 435
11/25/03
Greg KirtonKevin ZitzowPhuong Mai
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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
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Heat Exchanger in UTC Lab
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FT=Flow Transmitter S=SolenoidTT= Temp TransmitterCW=Cold WaterW/H=Water HeaterCWS=Cold Water SupplyCWR=Cold Water Return
Schematic of Heat Exchanger
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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
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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
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Cold Water Flow Calibration
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Cold Water Flow Data
0
2
4
6
8
10
12
14
0 20 40 60 80 100
% Valve Open
Flow
Rat
e (lb
/min
)
Data from DAQ
Measured Data
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Cold Water Flow Rate Calibration
y = 1.4981x + 0.1922R2 = 0.9944
0
2
4
6
8
10
12
0 2 4 6 8 10 12
DAQ Flow rate (lb/min)
Mea
sure
d Fl
ow R
ate
(lb/m
in)
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Hot Water Flow Calibration
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Hot Water Flow Data
0
2
4
6
8
10
0 20 40 60 80 100
% Pump Speed
Flow
rate
(lb/
min
)
Measured Data
DAQ
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Hot Water Flow Rate Calibration
y = 0.0255x2 + 1.2302x - 2.2253R2 = 0.9942
0
2
4
6
8
10
0 2 4 6 8 10DAQ (lb/min)
Mea
sure
d (lb
/min
)
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Temperature Calibration
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Insulation
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Tube Side Port B
Tube Side Port A
Shell Side Port B
Shell Side Port A
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Temperature Data
Location Measured (oC) DAQ (oC)CWS From Lab Sink 22.5 21RTD Shell Side Port A 46 47RTD Shell Side Port B 31.5 31RTD Tube Side Port A 30.8 31.7RTD Tube Side Port B 17.7 16.7
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Overall Heat Transfer Coefficient of Heat Exchanger
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Objectives
Compare total heat transfer rates of the hot and cold streams.
Determine the overall heat transfer coefficient.
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Pictures of the Heat Exchanger
Hot water in
Cold water in
Tube bundle
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Heat Transfer Properties
55 tubes Tube Volume = 143 cc Tube Length = 506 mm Total heat transfer area = 0.27 m2
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Heat Transfer Diagram
Thot,inThot,out
Tcold,in Tcold,out
q
lmTUAq
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Log Mean Temperature
))()(
ln(
)()()/ln(
,,
,,
,,,,
12
12
ocih
icoh
ocihicohlm
TTTT
TTTTTTTT
T
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Heat Transfer Rate Equations
)(
)(
,,,
,,,
ihohchhh
icoccpcc
TTcmq
TTcmq
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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
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q and U Results of 1st Run
qc =5.76 kW qh = 3.37 kW Uc = 1352 W/m2K Uh= 792 W/m2K
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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
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q and U Results of 2nd Run
qc =2.33 kW qh = 2.25 kW Uc = 532 W/m2K Uh= 514 W/m2K
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Overall Heat Transfer Coefficient (U)
0
200
400
600
800
1000
1200
1400
1
U (W
/m2K)
1). HWS = 0.04124kg/s and CWS = 0.080 kg/s2). HWS = 0.0258 kg/s and CWS = 0.0505 kg/s
1st
2nd
1st
2nd
Hot FlowCold Flow
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Total Heat Transfer Rate (q)
0
1
2
3
4
5
6
7
1
q(kW
) Hot Flow Cold Flow
1st2nd 2nd
1st
1). HWS = 0.04124kg/s and CWS = 0.080 kg/s2). HWS = 0.0258 kg/s and CWS = 0.0505 kg/s
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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/s2). HWS = 0.0258 kg/s and CWS = 0.0505 kg/s
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Questions
?????