Introduction to Interference By: Nickolay Dovgolevsky Itai Sharon 29/05/03.
CONSTANT TEMPERATURE AIR BATH Team Members: Mark Campbell Peter Giles Andrew Smith Tom Strapps...
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Transcript of CONSTANT TEMPERATURE AIR BATH Team Members: Mark Campbell Peter Giles Andrew Smith Tom Strapps...
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CONSTANT TEMPERATURE CONSTANT TEMPERATURE AIR BATHAIR BATH
Team Members:•Mark Campbell•Peter Giles•Andrew Smith•Tom Strapps•Nickolay Suther
Team Supervisor:Dr. Prabir Basu
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Presentation OutlinePresentation Outline
•What are we doing?
•What are the options?
•How do thermoelectrics work?
•How are we going to solve the problem?
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What is an Air Bath?What is an Air Bath?
•Controlled Environment
•Liquid Baths
•Research and Calibration
http://www.guildline.ca/Datasheet/Guildline503XDatasheet.pdf
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Project RequirementsProject Requirements•Temperature Range
+5°C to +25°C
•Temperature Control +/- 0.2°C
•Noise <40 dB
•Minimize Vibration
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Design Features ConsideredDesign Features Considered
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Design SelectedDesign Selected
•Forced Convection
•Top Loading
•PID Control
•Thermistor Sensing
•Two Thermoelectrics
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Air Bath ConstructionAir Bath Construction•Frame
Welded Steel
•InteriorFibreglass (25cm)3
•CaseFolded Sheet Metal
•InsulationStyrofoam™ SM (5cm Thick)
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ThermoelectricsThermoelectrics•Pump heat•Small
40mm x 40mm x 4mm
•Efficiency COP Refrigerator ~ 4COP Thermoelectric < 1.5
•Reversible
http://www.electracool.com/
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Peltier EffectPeltier Effect
Source:http://jchemed.chem.wisc.edu/Journal/Issues/1996/Oct/abs940.html
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PeltierPeltier PerformancePerformance
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Heat DissipationHeat Dissipation
•Passive Heat Loadq=kA(T2-T1)/L
q ~ 10W
•Joule HeatP=IVq ~ 70W
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Heat Sink AssemblyHeat Sink Assembly
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Measurement SystemsMeasurement Systems
•Temperature SensorsRTDThermistorThermocouple
•Overheat ProtectionEmbedded Thermocouple
http://www.veriteq.com/images/thermocouple-thermistor.jpg
Thermocouple ThermistorRTD
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System ControlSystem Control•Requires sensing, analysis and power control
On/Off PID
•Lumped Parameter Model
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System ModelSystem Model
5
Thermostat
Tout
Temperatures
Relay
Time
Qm
Qf
Qc
Clock
Tm
Tc
Ti
Thermostat1s
Main
Qout
Heat Flow
Ks
Kf
Ks
Kf
1/Cc
1/Ci
Gain1
1/Cm
25
Constant1
Clock1
Clock
1s
Basement
1s
Attic
Add9
Add8
Add7
Add4
Add3
Add2
Add1
Add
Qm
Qm
Tm
Tm
Tm
To
To
To
Tc
Tc
Tc
Tc
Tc
Qf
Qf
Ti
Ti
Ti
Ti
Qi
Thermostat
Thermostat
Qc
Qc
Clock
Time
Lumped Parameter ON/OFF Control Model
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0 1 2 3 40
10
20
30T
em
p (
C)
TEMPERATURES
0 1 2 3 40
5
10
15
20
25
Time (hr)
Hea
t Flo
ws
(W)
HEAT FLOWS
CoolerInsulationSetpoint
To Cooler from Insulation
TEC Heat Removal
Simulink ResultsSimulink Results
25 minutes
On/Off Control 1°C Dead band
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Mock-up TestingMock-up Testing
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The Next Step…The Next Step…•Order necessary parts
•Start construction
•Continue Mock-up Testing
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Special Thanks ToSpecial Thanks To
•Greenfield Research
•Greg Jollimore
•Dr. Prabir Basu
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