Solar Concentrator Presentation
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Transcript of Solar Concentrator Presentation
7/18/2019 Solar Concentrator Presentation
http://slidepdf.com/reader/full/solar-concentrator-presentation 1/24
Peltier Solar Concentrator
By: Michael Forrest
Kyle Fifield
Evan White
7/18/2019 Solar Concentrator Presentation
http://slidepdf.com/reader/full/solar-concentrator-presentation 2/24
The Problem
• To demonstrate that a thermoelectric device
can efficiently converted solar energy into
electricity.
• The goal is to create a system equally efficient
to PV panels or even more efficient.
7/18/2019 Solar Concentrator Presentation
http://slidepdf.com/reader/full/solar-concentrator-presentation 3/24
The Solution
• Satellite Dish Sun Concentrator
• Collector Plate
•
Thermal Electric Peltier Device• Azimuth-Altitude Solar Tracking
• Battery Storage
7/18/2019 Solar Concentrator Presentation
http://slidepdf.com/reader/full/solar-concentrator-presentation 4/24
What is a Thermoelectric Device?
• A thermoelectric “Peltier” device uses a
seebeck effect to create power.
• The seebeck effect uses the temperature
differential to create a magnetic field which
current can flow through
7/18/2019 Solar Concentrator Presentation
http://slidepdf.com/reader/full/solar-concentrator-presentation 5/24
Solar Rays
Solar Concentrator
Sun
Peltier Device
Solar Collector
Azimuth Rotation
Horizontal Tilt
Dc/Dc
Step-up
Microcontroller
Motor ControllerMotor Controller
System Diagram
7/18/2019 Solar Concentrator Presentation
http://slidepdf.com/reader/full/solar-concentrator-presentation 6/24
Solar Tracking Subsystem
• Time of day tracks time
• User interface will include buttons and 7-
segment display
• Motor controllers
• 2 motors
•
Encoders will be used to keep track of howmany turns the motors rotate.
7/18/2019 Solar Concentrator Presentation
http://slidepdf.com/reader/full/solar-concentrator-presentation 7/24
Solar Tracking System Diagram
7/18/2019 Solar Concentrator Presentation
http://slidepdf.com/reader/full/solar-concentrator-presentation 8/24
Solar Tracking Positioning Equations
Elevation (zenith) Angle = Azimuth Angle =
Inputs• Date and Time
• Longitude and Latitude
7/18/2019 Solar Concentrator Presentation
http://slidepdf.com/reader/full/solar-concentrator-presentation 9/24
User Interface
Displays:• Time of Day
• Date
• Azimuth Angle
• Altitude Angle
Pushbuttons:• Up/Down
Selection Arrows
• Menu Option
• Enter Button
7/18/2019 Solar Concentrator Presentation
http://slidepdf.com/reader/full/solar-concentrator-presentation 10/24
1 7.5
Dish
E
Base
Encoder
-Encoder
16 pulses/rev360deg/16 pulses = 22.5degs/pulse
-Encoder with Sprockets
1 to 7.5 sprocket ratio
(22.5deg/pulse)*(1/7.5)= 3deg/pulse
Azimuth Motor Mechanism
7/18/2019 Solar Concentrator Presentation
http://slidepdf.com/reader/full/solar-concentrator-presentation 11/24
Thermoelectric Mounting Subsystem
• Purpose:
– Maximize Performance and Power Efficiency of HZ-20.
– HZ-20 Module Around 5% Efficient.
• Design Aspects: – Minimum Load of 200 psi on HZ-20.
– Thermal Expansion of HZ-20.
– Efficient Heat Transfer
– Keeping Cold Side of HZ-20 Cool.
7/18/2019 Solar Concentrator Presentation
http://slidepdf.com/reader/full/solar-concentrator-presentation 12/24
Subsystem Diagram of Thermoelectric Mount
7/18/2019 Solar Concentrator Presentation
http://slidepdf.com/reader/full/solar-concentrator-presentation 13/24
Loading on HZ-20 Module
• Ensures Module
Remains in
Compression to
Maximize Heat Transfer.• Solution:
– Belleville Springs.
– Apply Large Amount of
Force in Compact Area.
– Also Allows for Thermal
Expansion.
7/18/2019 Solar Concentrator Presentation
http://slidepdf.com/reader/full/solar-concentrator-presentation 14/24
Efficient Heat Transfer
• Thermal Grease:
– Ensures Efficient Heat Transfer from Mount to HZ-
20 and HZ-20 to Heat Sink.
• Overhang of 0.5 Inches and 0.25 Inches of
Thickness on Mount:
– Ensures Uniform Heating on HZ-20.
7/18/2019 Solar Concentrator Presentation
http://slidepdf.com/reader/full/solar-concentrator-presentation 15/24
7/18/2019 Solar Concentrator Presentation
http://slidepdf.com/reader/full/solar-concentrator-presentation 16/24
Thermal Diagram
TBar
TH
TC
THS
TA
∆T
Thermal Resistance
ofThermal Adhesive
Thermal Resistance
ofPeltier Junction
Thermal Resistance
of
Heat Sink
Temperature of Bar
Temperature of Hot Side
Temperature of Cold Side
Temperature of Heat Sink
Temperature of Ambient
7/18/2019 Solar Concentrator Presentation
http://slidepdf.com/reader/full/solar-concentrator-presentation 17/24
Energy Gain
B
A AreaEclipes = πAB
Area of Dish = 0.303077m²
Area of FP = 0.003488m²
Energy Gain = Area of Dish / Area of Focal Point
Energy Gain = 87
7/18/2019 Solar Concentrator Presentation
http://slidepdf.com/reader/full/solar-concentrator-presentation 18/24
Efficiency Strategies
85% ReflectivityDish Covered with Reflective Tape
Aluminum Collector Plate Painted Black
Absorbs 90% of light
7/18/2019 Solar Concentrator Presentation
http://slidepdf.com/reader/full/solar-concentrator-presentation 19/24
Efficiency Diagram
Reflective Tape 85%
Efficient
Sun
90% Absorption
Efficiency
5% Heat to
Electricity Efficiency
Wasted
Heat
Step-up Dc/Dc
Converter
95% Efficient 12v Lead
Acid
92% Storage
Efficiency
Total Efficiency = 3.34%
Sunlight to Usable Energy
7/18/2019 Solar Concentrator Presentation
http://slidepdf.com/reader/full/solar-concentrator-presentation 20/24
Power Diagram
1000W/m²
303.1W
Sun
Concentrator Collector
232W
8 mins to heat up
Peltier Device
220W
Heat Sink
3V, 6.67A, 20W
Dc/Dc
Step-up
12V, 800mA, 9.6W
7/18/2019 Solar Concentrator Presentation
http://slidepdf.com/reader/full/solar-concentrator-presentation 21/24
Dc/Dc Step-up Convertor
1.8V to 5.5V
7/18/2019 Solar Concentrator Presentation
http://slidepdf.com/reader/full/solar-concentrator-presentation 22/24
Areas of Responsibility
Evan
Kyle
Mike
Solid Modeling / Peltier Mounting / Temperature Sensing
Energy & Power Calculations/ Thermal Design/Dc-Dc Step-Up Circuit
Solar Tracking/ Time of Day Sensor Calculations & Programming/
Motor controllers
7/18/2019 Solar Concentrator Presentation
http://slidepdf.com/reader/full/solar-concentrator-presentation 23/24
Schedule
• Things to be done
– Design altitude motor mechanism
– Build azimuth and altitude motor mechanism
–
Get final dimensions and mount HZ-20 on heat sink – Order parts
– Troubleshoot TOD programming, finish coldfire calculation
programming, design user input program, add motor
driver program
7/18/2019 Solar Concentrator Presentation
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Questions?