HIGH TEMPERATURE THERMOELECTRIC HEAT EXCHANGER AND...
Transcript of HIGH TEMPERATURE THERMOELECTRIC HEAT EXCHANGER AND...
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HIGH TEMPERATURE THERMOELECTRIC HEAT EXCHANGER AND OPTIMIZATION OF DISSIPATIVE SYSTEMS APPLIED IN AUTOMOTIVE
Pasadena CA3rd August 2017
Fabio PugliaC. Fanciulli, V. Ottolina, F. Riva and A. Mari
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Zeus: how it works
Truck: Boat:
To charge the batteries of camper, trucks and boats when they are exhausted
Camper:
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First Prototype : 6 modules
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First prototype: Results
150
175
200
225
250
275
0.00.00 0.08.38 0.17.17 0.25.55 0.34.34 0.43.12
T [°
C]
time [hh:mm:ss]
Hot side temperature (corner)
Temperature
Power increase
25
30
35
40
45
50
0.00.00 0.14.24 0.28.48 0.43.12
T [
°C]
time [hh:mm:ss]
Water temperature
Inletwatertemperature
40
50
60
70
0.15.50 0.23.02 0.30.14 0.37.26 0.44.38
Po
we
r [W
]
Time [hh:mm:ss]
Output Power
Power output
Power increase
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First Prototype: CFD + Heat Transfer Simulation
Combustion chamber: Cooling system:
CFD model was created and verified on experiment dataAt steady state
Temperature hot side TEG 231 °C Temperature cold side TEG 54 °C
Experiment Simulation
T gas outlet 280/300 °C 302 °C
T corner TEG
257 °C 252 °C
Experiment Simulation
T water outlet
45,3 °C 45,5 °C
T external 47,8 °C 48,4°C
Laminar flow
DeltaT=177°C
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First Prototype: Output Power and Electrical Consumption
Auxiliary devices Consumption [W]
Water pump 12,6
Airfan 18
Total 30,6
Maximum output power [W]
Prototype (6 TEGs) 64
Net power output: 33,4 W
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First Prototype: Conclusions
▪ Maximum Net Output Power < 55 W
Not enough for a commercial product
▪ Cannot be commercialized: weight, gas supply, dimensions…
Needs to be engineered
✓The Prototype produces electric power using LGP in a silent and reliable way
What needs to be improve?
What did we achieve?
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Second prototype
Specifications:
✓ Gasoline/Diesel supply (burner)
✓ Silent ( 32 dB)
✓ Net output power: 100/150 W
✓ Maximum height: 260 mm
✓ Maximum weight: 40 Kg
✓ Competitive price: <3.000,00 $
✓ Compatible for automotive application (vibrations…)
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Second prototype: geometry
• 12 TEG (modules with maximum output power 28W)
• Increased the inlet power: burner 5 kWCombustion chamber:
Inlet burner
Outlet burner
Water cooling system
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Second prototype: characteristics
Materials:• Combustion chamber: cast iron• Cooling system: aluminum
Dimensions: 450 x 390 x 260 mm
Weight: 40 kg
Pressing force: 1 MPa
Thermocouples to check temperatures
Power: 150 W
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Heat Exchanger Optimization
2 lines of thermoelectric modules: 6 each
Medium flux for first line: 16 W/cmq
Medium flux for second line: 11 W/cmq
24 We output
16 We output
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Second prototype: issues and challanges
• Combustion chamber cannot be made using shell molding technology
adapted the geometry
• Auxiliary device consumption
Auxiliary devices Consumption [W]
Burner eletronics 30
Water pump 12,6
Airfan 60
Total 102,6
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Optimization of the air fan
Fan shape opt.:
1 prototype: 85 W - 75 dB 1m
2 prototype: 50 W - 52 dB 1m
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Optimitazion of the cold side exchanger
0
5
10
15
20
25
10 15 20
W IN FUNZIONE DELLA PORTATA
Temperature opt. On the cold faceElectrical output vs. Water flux l/min
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Conclusions and Future Work
✓ Designed a silent prototype with diesel supply, compact, compatible to automotive application.
✓ Increase the net power output reduce the consumption of auxiliary devices
✓ Adapt the system to burners of different sizes (campers and trucks)✓ Adapt the system to work with sea water as cooling system (boats)
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THANK YOU FOR YOUR KIND ATTENTION
Pasadena CA3rd August 2017
Fabio PugliaC. Fanciulli, V. Ottolina, F. Riva and A. Mari