direct electric heating of domestic water
DESCRIPTION
Final Year Project PresentationTRANSCRIPT
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-SAMARTH PAWARDR. TADUESZ CZASZEJKO
DIRECT ELECTRIC HEATING OF DOMESTIC WATER
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INTRODUCTIONAIM
Heat Water by passing electric current directly through it.
Limit CurrentPrevent Electrolysis of Water
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INTRODUCTION
POWER SUPPLY UNITAC source / Rectified DC
sourceCONTROLLER UNIT
HEATThermocouple
CURRENTHall Effect sensor
ELECTRODESParallel plateR=ρ*length/surface area
POWER SUPPLY
CONTROLLER
COLD
HOT
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POWER SUPPLY
Low Peak to RMS ratio.Firing Angle control of thyristor.H-Bridge switching , emulating alternating
current.Low losses.
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CONTROLLER SOLUTIONCONTROL PARAMETERS
Reference Current(Ir)Reference Temperature(Tr)
WATER MODEL PARAMETERSLength, Width (gap between electrodes), Height,
Resistance, Flow Rate and Initial Temperature.
Tr PI(t) PI(i)PLANT1: POWER SUPPLY
PLANT2: ELECTRODES
-1
-1
Et Ir Ei α I T
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PSIM SIMULATIONS – (flow rate)
FLOW RATE = 9L/m, R=5 Ohms, Initial Temperature = 0 FLOW RATE = 7.8L/m, R=5 Ohms, Initial Temperature = 0
FLOW RATE = 6.6L/m, R=5 Ohms, Initial Temperature = 0 FLOW RATE = 0.5L/m, R=5 Ohms, Initial Temperature = 0
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PSIM SIMULATIONSFLOW RATE = 9L/m, R=4 Ohms, Initial Temperature = 0 FLOW RATE = 9L/m, R=1 Ohms, Initial Temperature = 0
FLOW RATE = 9L/m, R=5 Ohms, Initial Temperature = 10 FLOW RATE = 9L/m, R=5 Ohms, Initial Temperature = 20
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EXPERIMENTAL SET UP
Isolation Step Down TransformerDiode BridgeCapacitor-470uFResistor-112 Ohms Load bank setting.Dead time control
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MINIMUM DEAD TIME OF 4US CLOSER TO MAXIMUM DEAD TIME
MINIMUM DEAD TIME , SHOWS RECTIFIED VOLTAGE SWITCHING VOLTAGES ACROSS THE ELECTRODES
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CONCLUSIONSUniversal water heater – higher supply
voltages, support wide range of resistivity’s.
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CONCLUSIONSUse of Simulation Model
Better ElectrodesDifferent components
Alternate MethodsBuck/Boost Convertor topologiesDevelopment of better inductors
Experimental Set Up can be used with electrodes with isolation.
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ACKNOWLEDGMENTDr. Tadeusz CzaszejkoMr. Ian Reynolds, Mr Ray Chapman and Mr
Ray CooperSpecial thanks to David PetzerThank You Supervisors
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