Integrated Thermoelectric Photovoltaic Renewable Energy System

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24 Νοε 2013 (πριν από 3 χρόνια και 10 μήνες)

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Integrated Thermoelectric Photovoltaic
Renewable Energy System

Luocheng Wang, Jonathan Weiss, Antony Xenophontos



Advanced Power Electronics and Electric Drives Lab (APEDL)

ECE Department and Center for Clean Energy Engineering

Team 189

Adviser: Prof. Ali Bazzi


Senior Design Proposal Presentation

10/16/2013

Outline


Project Overview & Statement of Need


Applications & System Description


Overview of Photovoltaics
&
Thermoelectrics


Physical Configurations & Limitations


Execution Plan & Service Learning


Questions

Project Overview


Currently, a major concern with sustainable energy
sources is their low efficiencies


Photovoltaic Solar Panel n ~ 15
-
20%


Thermoelectric Generator n ~ 5
-
10%



Solar and thermal energy sources are usually available
simultaneously.



The goal is to develop a more efficient system by
harvesting both of these energy sources.


Statement of Need


The main objective of our project is to analyze, model and
evaluate a hybrid PV & TEG system.



We plan on doing this by:


Testing and comparing TEGs and solar panels individually,
then as various configurations


Series


Parallel


Individual


Develop mathematical models for each configuration


Finally, determine and build the most efficient integrated
system



Outline


Project Overview & Statement of Need


Applications & System Description


Overview of Photovoltaics
&
Thermoelectrics


Physical Configurations & Limitations


Execution Plan & Service Learning


Questions

Applications


Vehicles


Solar cells on roof


TEGs under the hood/near exhaust



House


Solar Panels on roof


Indoor/Outdoor temperature difference



Naval Vessels


A lot of space for Photovoltaic arrays as auxiliary power supply


TEGs on hull for exterior/interior temperature difference



System Description

Outline


Project Overview & Statement of Need


Applications & System Description


Overview of Photovoltaics
&
Thermoelectric


Physical Configurations & Limitations


Execution Plan & Service Learning


Questions

Photovoltaics


Solar cells convert solar
energy to electrical
energy using the
photoelectric effect.


Sh
S
AKT
IR
V
q
O
L
R
IR
V
e
I
I
I
S






)
1
(
)
(
UCONN APDL Lab

Photovoltaics


Cont.

IV curve (black) and Power Voltage curve (green) for
photovoltaics


from
Solartech

Power Inc. SPM030P Specification.


The power curve from
the solar cell has a
maximum point at which
the cell is most efficient.



Maximum Power Point
Tracking (MPPT) is the
method to detect this
point.

Thermoelectrics


TEGs draw energy from the
heat difference between the
two
plates, using the
Seebeck

effect.


T
G
V
I
G
r
G
V
V





“Thermoelectric
Develoments

for Vehicular
Applications”


John W. Fairbanks

Thermoelectrics


Cont.

IV curve (black) and Power Voltage curve (blue) for TEG from
Solidate

Power Generator TEG1
-
12611
-
6.0 Specification.


Thermoelectric
modelling also
includes a
maximum power
point



MPPT is much
easier for TEGs
based on the
shape of the power
curve.

Outline


Project Overview & Statement of Need


Applications & System Description


Overview of Photovoltaics
&
Thermoelectric


Physical Configurations & Limitations


Execution Plan & Service Learning


Question

System Configuration


We will have to determine a way to mount the TEGs
onto the Solar Panels to take advantage of the
excess heat.



Integrated configuration
-


TEG on back of solar panel


TEG under partial shading


TEG under focused light

System Configuration

TEGs on a Solar Panel


Due to solar panels low efficiency, a lot of energy is
wasted as either reflected light or heat.



Placing TEGs on the back of the solar panel can take
advantage of this waste heat, but the panel
temperature rise is very limited (~3
o
C
)



Possible solutions:


Use heat absorbent material between the solar cells to
increase power from the TEGs


Set requirements for new TEG designs


Have separate heat and light sources

System Configuration

Hot Spots


Solar Panels are solar cells in series, so they all share
current under normal conditions.



An area of shading over a solar panel results in current
dropping in the shading area.



This causes voltage to rise in the unshaded area.



Voltage rising leads to reverse bias in the same area,
known as a ‘Hot Spot’.







System Configuration

Focusing Sunlight


Focusing sunlight is a way to increase incoming
solar energy.



This will increase the temperature difference on the
TEG.



Thus, the total power will be increased under this
configuration.

System Limitations


This system is entirely reliant on environmental factors.


Night, Clouds, etc.


Seasonal/Topographical temperatures



The system must remain affordable


Extra power afforded by the system must outweigh extra cost of
construction.



Efficiency advantage of the integrated system


The configuration must lead to a higher efficiency than either of
the individual components.

Outline


Project Overview & Statement of Need


Applications & System Description


Overview of Photovoltaics
&
Thermoelectric


Physical Configurations & Limitations


Execution Plan & Service Learning


Questions


Timeline

09/30/13
-

10/12/13

Literature
Review

Modelling

10/13/13
-

10/27/13

10/27/13
-

11/10/13

11/11/13
-

11/25/13

11/26/13

-


12/09/13

12/10/13
-

12/17/13

Individual
Configuration
Testing

Begin Physical
Configuration
Design

Component
Selection

Service Learning


As part of our Senior Design Project we also plan to
take part in Service Learning.


We will present our completed project and related
energy efficiency concepts to one or more local high
schools.


This will raise awareness on the subject of
sustainable energy, as well as the value of this
research.


Will add a new dimension of public outreach to our
project.

Outline


Project Overview & Statement of Need


Applications & System Description


Overview of Photovoltaics
&
Thermoelectric


Physical Configurations & Limitations


Execution
Plan & Service Learning


Questions

Questions?