Cover Your A$$ets Solar Panel Protection Project Team: Krista Miller Sohaib Hasan John Helme.
-
date post
22-Dec-2015 -
Category
Documents
-
view
217 -
download
0
Transcript of Cover Your A$$ets Solar Panel Protection Project Team: Krista Miller Sohaib Hasan John Helme.
Cover Your A$$etsSolar Panel Protection
Project Team:Krista MillerSohaib HasanJohn Helme
What is the problem? Passive solar panels
collect energy in the form of heat. It is possible for the temperature of these panels to exceed a desirable limit.
One solution is to “dump” hot
water and add cold water.
Normal Solutions
Another solution is to use a “large” thermal like a swimming pool or the earth.
These options are not always viable.
Problem Statement The maximum temperature that a passive solar
panel can reach must be controlled. The temperature control system must work without using additional water. When not active, the control system shall not interfere in the efficiency of the solar panels.
Solution Constraints:The solution must: Work on any number of panels. Have both an automatic and manual control. Have user adjustable temperature setting. Have a maximum cost of $200 per panel.
Summary of SolutionsSolution Resolves
ProblemEconomically Feasible
Conserves Energy
Uses Electro-mechanical systems
Dump heat into ground
Yes No No No
Sterling Engine
No – limited heat dissipation
Unknown Yes Yes
Seebeck Device
No – limited heat dissipation
No Yes Yes
Energy Blocking
Yes Yes No Yes
Solution Statement Blinds will be automatically positioned to
cover a solar panel before the panel temperature reaches a critical level.
Each solar panel will:
Have a complete and independent blind system.
Have adjustable temperature controls.Be controlled by a single override control.
Microcontroller
Position Sensors 1-3
Temp Sensor
M
Increment
Motors
Manual Override
Power
Motor Controller
System Diagram
Above is a picture of how the solar panel cover will be mounted on the existing panels.
Mechanical System Diagrams
Cover
Heavy Duty Premium White Tarp
6 oz per Square Yard 1200 Denier UV Treated For Longer Protection 12 Mil Thickness 14x14 Weave Count Water-resistant Rot-proof Dust-proof.
DC Motors & Motor Driver:
Motor Denso 730557-7030 12V, 3.3A 163 RPM 100 oz in torque
Motor Driver H Bridge
Temperature Sensing Diagram Type K Thermocouple
Self Powered Simple Rugged Inexpensive Wide Temperature Range
Thermocouple Processing/Conditioning
Electronics Overview
Open Limit Switch (in back)Covered Limit Switch
Mid Position Limit Switch
Microcontroller Freescale HCS08
10bit A2D converter Ease of use Inexpensive Available Code
Position Switches SPST Momentary Roller Switch
State Diagram
Start0 0
Open00 1
Idle10 0
Idle 00 0
Idle½0 0
Open½0 1
Close1 0
Start0 0
Close½1 0
Motor close Motor openp.open<>1
elsep.open=1
else
elseelse
pos.hw=1
else
or.open=1 or
temp<s.open.ref
or.clsd
=1
pos.
clsd
=1
temp>s.clos.ref ortemp>c.clos.ref or
or.clsd=1
pos.hw = 0
temp<s.open.ref
or.o
pen=
1
Reference Variables
Standard close temperature s.close.refCritical close temperature c.close.refStandard open temperature s.open.ref
These values will be set usingpotentiometers on the controller circuit.
Sensors
Sensor VariablePanel open pos.openPanel 1/2 open pos.hwPanel closed pos.clsdTemperature temp
Override ControlsControl VariableOpen or.openClose or.clsd
temp>s.close.ref
Budget for Major and Minor Components Demonstration
UnitProduction
UnitMechanical System $75.00 $120.00includes- gears, belts, chains, bearings, bearing blocks and mounting hardware
Electronic System 35.00 35.00includes- microprocessor, sensors, switches, circuit boards and other support circuitry
Motor Donated 25.00
Enclosures 20.00 25.00includes enclosures for motor, electronics, over ride controls
Power Supply N/A 50.00
Cable and connectors $10.00 $10.00
Cover Material $10.00 $30.00
PVC Demonstration frame $35.00 N/A
Total $185.00 $295.00
Informative Schedule, Balanced Personnel Assignments, Milestones
TasksCompletion Date Assigned To
Milestone Completed
I: Problem Definition and Solution Identification 12/5/2006
II: Research 1/20/2007
III: Physical Modeling and Feasibility Tests 2/6/2007
Mechanism Concepts – interference, linkages 1/16/2007 Krista
Circuit simulation 1/23/2007 Sohaib
Sensors – output and amplification 1/31/2007 Sohaib
Component coupling 1/31/2007 Krista and John
Power and torque perfomance – manual torque tests 1/31/2007 John
Heat transfer, temperature control 2/29/2007 Krista
IV: Design 2/13/2007
Material selection, justification 1/31/2007 John
Mechanical drawings – brackets 2/6/2007 Krista
Electrical Diagrams – circuit boards, power distribution 2/6/2007 Sohaib
State diagrams and flow charts 2/6/2007 John
System diagram with components and interface signal details 2/20/2007 All
V: Build 3/6/2007 All
VI: Subsystem Test 3/14/2007 All
VII: System Integration 4/3/2007 All
VIII: Functionality test and Demonstration All
Summary Problem: The temperature of the
solar panels must not exceed a maximum temperature.
Solution Constraints: Must work on any
number of panels. Must have both an
automatic and manual control.
Must have a maximum cost of $200 per panel.
Solution: Solar panels will be
automatically covered when they reach a set temperature.
Solution Constraints: Controller and motor for
each panel. Open, close and power
off override controls. Demonstration system
estimated cost of $185.