1. Peltier Solar Concentrator
By: Michael Forrest
Kyle Fifield
Evan White

2. 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.

3. The Solution Satellite Dish Sun Concentrator Collector Plate
Thermal Electric Peltier Device
Azimuth-Altitude Solar Tracking
Battery Storage

4. 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

5. System Diagram Sun Solar Rays Dc/Dc Step-up Microcontroller
Solar Concentrator
Horizontal Tilt
Peltier Device
Solar Collector
Dc/Dc Step-up
Azimuth Rotation
Microcontroller
Motor Controller
Motor Controller

6. 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 how many turns the motors rotate.
Vertical and Horizontal Tracking using DC motors. One motor controls the horizontal rotation and the other controls the vertical rotation.

7. Solar Tracking System Diagram

8. Solar Tracking Positioning Equations
Elevation (zenith) Angle =
Azimuth Angle =
Inputs
Date and Time
Longitude and Latitude

9. User Interface Displays: Time of Day Date Azimuth Angle Altitude Angle
Pushbuttons:
Up/Down Selection Arrows
Menu Option
Enter Button

10. Azimuth Motor Mechanism
Dish
-Encoder
16 pulses/rev
360deg/16 pulses = 22.5degs/pulse
-Encoder with Sprockets
1 to 7.5 sprocket ratio
(22.5deg/pulse)*(1/7.5)= 3deg/pulse
Encoder E 1
7.5
Base

11. 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.

12. Subsystem Diagram of Thermoelectric Mount

13. 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.

14. 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.

16. Thermal Diagram TBar TH TC THS TA Thermal Resistance of
Temperature of Bar TH
Temperature of Hot Side
Thermal Resistance of
Thermal Adhesive
Thermal Resistance of
Peltier Junction ∆T TC
Temperature of Cold Side
Based on the HZ-20 Thermoelectric Module, we chose a ∆Temp of 200°C.
When receiving a reasonable ∆Temp of 200°C, we can properly size our Heat Sink (Degrees Celsius per Watt).
THS
Temperature of Heat Sink
Thermal Resistance of
Heat Sink TA
Temperature of Ambient

17. Energy Gain AreaEclipes = πAB Area of Dish = 0.303077m²
Area of FP = m²
Energy Gain = Area of Dish / Area of Focal Point
Energy Gain = 87

18. Efficiency Strategies
85% Reflectivity
Dish Covered with Reflective Tape
Absorbs 90% of light
Aluminum Collector Plate Painted Black

19. Efficiency Diagram Sun Sunlight to Usable Energy
Reflective Tape 85% Efficient
5% Heat to Electricity Efficiency
90% Absorption Efficiency
Wasted Heat
Step-up Dc/Dc
Converter
95% Efficient
12v Lead
Acid
Total Efficiency = 3.34%
92% Storage Efficiency

20. Power Diagram Sun Dc/Dc Step-up 8 mins to heat up Concentrator
1000W/m²
Concentrator
Collector
Peltier Device
Heat Sink
303.1W
232W
220W
3V, 6.67A, 20W
Dc/Dc Step-up
12V, 800mA, 9.6W

21. Dc/Dc Step-up Convertor
1.8V to 5.5V

22. 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

23. 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

24. Questions?