Presenting Author G.Muthu Research scholar Department of Mechanical Engineering National Institute of Technology Tiruchirappalli Tamil Nadu Co Authors Prof. S.Shanmugam Prof. AR.Veerappan 18/06/22 1 National Institute of Technology Tiruchirappalli, India
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Presenting Author
G.MuthuResearch scholar
Department of Mechanical Engineering
National Institute of Technology
Tiruchirappalli
Tamil Nadu
Co Authors
Prof. S.Shanmugam
Prof. AR.Veerappan
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Solar Parabolic Dish Thermoelectric Generator with Acrylic Cover
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Introduction
Concentrating solar power (CSP) systems namely parabolic trough, linear Fresnel reflector, power tower and parabolic dish can be used effectively to convert solar energy into heat.
Solar thermal thermoelectric generator is the most promising option.
Working principle - Seebeck effect.
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Seebeck Effect
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National Institute of Technology Tiruchirappalli, India
Thermoelectric properties are computed from the following expression (Melcor, 2009).
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Electric output & TEG Efficiency
The output (Pteg) from TEG is estimated from the relation
The efficiency of TEG
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Overall efficiency
Overall system efficiency (ηoverall ) is computed from the relations
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Receiver plate temperature with solar beam radiation
Results
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500 600 700 800 900 1000 1100250
270
290
310
330
350
370
390
With cover
Without cover
Solar beam radiation (W/m2)
Rec
eive
r pl
ate
tem
pera
ture
(K
)
Instantaneous thermal efficiency of collector with solar beam radiation
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500 600 700 800 900 1000 110062.0
63.0
64.0
65.0
66.0
67.0
68.0
With cover
Without cover
Solar beam radiation (W/m2)
Inst
anta
neou
s th
erm
al e
ffic
ienc
y o
f pa
rabo
lic
dish
col
lect
or (
%)
The output voltage for various solar beam radiations
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500 600 700 800 900 1000 11000
0.5
1
1.5
2
2.5
3
3.5
4
4.5
With cover
Without cover
Solar beam radiation (W/m2)
Out
put
volt
age
of th
e sy
stem
(V
olts
)
Output power with solar beam radiation
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500 600 700 800 900 1000 11000
0.5
1
1.5
2
2.5
3
3.5
4
With cover
Without cover
Solar beam radiation (W/m2)
Ele
ctri
cal p
ower
out
put (
w)
Overall efficiency of the System with solar beam radiation
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500 600 700 800 900 1000 11000
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
With cover
Without cover
Solar beam radiation (W/m2)
Ove
rall
eff
icie
ncy
of th
e sy
stem
(%
)
Conclusions
A maximum of 383 K receiver plate temperature was obtained for TEG with cover at solar beam radiation of 1050 W/m2. It is 1.56% higher than in TEG without cover for the same solar beam radiation.
There is 2.11% improvement in overall efficiency for TEG with
cover as compared to that without cover.
The maximum voltage of the thermoelectric module achieved was 4 volts, which is 10.75% higher than TEG without cover for same solar beam radiation.
The electrical power output for modified TEG was 2.51% higher than that of the TEG without cover.
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Photographic view - TEG with solar dish
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References
[1] Reddy, K.S. and Sendhil Kumar, N. (2008) Combined laminar natural convection and surface radiation heat transfer in a modified cavity receiver of solar parabolic dish, International Journal of Thermal Sciences, 47, pp.1647–1657.
[2] Sukhatme, S.P. and Nayak, J.K. (2012) Solar energy: principles of thermal collection and storage, Edition 2, Tata McGraw Hill Publishing Company limited, India.
[3] Shanmugam, S., Eswaramoorthy, M., and Veerappan, AR. (2011) Mathematical Modeling of Thermoelectric Generator Driven, Applied Solar Energy, 47(1), pp31–35.
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References
[4] Eswaramoorthy, M. and Shanmugam, S.(2012) Numerical Model to Compute Heat Loss in Focal Receiver of Solar Parabolic Dish Thermoelectric Generator, Energy Sources, Part A: Recovery, Utilization Environmental Effects, 34, pp 959-965.
[5] Eswaramoorthy, M. (2010) Studies on solar parabolic dish thermoelectric generator, Ph.D. Thesis, Department of Mechanical Engineering, National Institute of Technology, Tiruchirappalli, India.
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