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International Journal of Advanced Research in Engineering and Technology (IJARET)
Volume 7, Issue 4, July-August 2016, pp. 37–42, Article ID: IJARET_07_04_005 Available online at
http://iaeme.com/Home/issue/IJARET?Volume=7&Issue=4 ISSN Print: 0976-6480 and ISSN Online: 0976-6499
© IAEME Publication
STUDY OF BOX TYPE SOLAR COOKER
WITH ENERGY STORAGE MEDIUM
Shaili Sharma and Dr. Ajeet Kumar Rai
Mechanical Engineering Department,
SSET, SHIATS Allahabad, U.P. India
ABSTRACT
In the present work experiment were performed and the two different
Models (Model I and Model II) of the box type solar cooker. Model I is simple
one whereas fins are attached at the base of the Model II. Magnesium nitrate
hexahydrate, a energy storage medium is used in the cooking pots for off
sunshine hour cooking. Experiments were conducted in the premises of
SHIATS, Allahabad in the month of June 2016. Two figures of merit F1 and F2
were obtained for the both models with simple cooking pot in Model I and
PCM assisted cooking pot in the Model II. It is observed that maximum
stagnation temperature inside the cooking chamber of Model II was more as
compared to that of Model I. Exergy efficiency was also calculated for both
the systems and found that the efficiency of Model II is more than Model I.
Key words: Energy Storage Medium, Solar Cooking.
Cite this article: Shaili Sharma and Dr. Ajeet Kumar Rai, Study of Box Type
Solar Cooker with Energy Storage Medium. International Journal of
Advanced Research in Engineering and Technology, 7(4), 2016, pp 37–42. http://iaeme.com/Home/issue/IJARET?Volume=7&Issue=4
1. INTRODUCTION
Solar energy is the renewable energy which is free and abundant in nature. Solar box cooker is a device which uses heat of sunlight to cook food. In India energy consumed
for various sectors, such as industrial, agricultural, transport, households and others, about 50% is used for cooking alone[1]. Cooking with the solar has to turn out to be a
probably feasible replacement for wood and fuel in preparing food. A large number of solar cooker have been developed, designed and tested in many countries. In 1767,
Horace-de –Saussure was the first in the world to use the sun energy for cooking more than 200 years ago. In 1876 Asia first the experiment was conducted by Adams, an
army officer [2]. In 1930, India to avoid deforestation began to investigate solar energy and M K gosh design first commercial solar box cooker in 1945. Since then,
numerous effort has been made to build a suitable solar cooker. The reflector type solar cooker was developed in early 1950 [3] and attempts were also made in 1960 to
1970 [4]. However a reflector type solar cooker did not get to be popular as it
Shaili Sharma and Dr. Ajeet Kumar Rai
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required tracking towards the sun, cooking could be done only during daytime in
direct sunlight, its performance was greatly influenced by dust and the wind, there
was a risk of the cook being burned as it was important to stand near the cooker when cooking and the design was complicated. These deformities were removed in the hot
box type solar cooker [5-7]. Solar box cooker is found to be the best because of its simple, easy design and relatively low cost. Thus, the box type solar cooker with a
single reflector [8] has been promoted by the Ministry of Non-Conventional Energy Sources, Government of India.
A box type solar cooker can be used only during the daytime. One has to load the
cooker for the evening meal at 2:00 PM. Also, its performance is highly influenced by low solar radiation during cloud or winter season as it can't prepare meals under low
radiation situation. Thus, there is a need to build a box type solar cooker with an energy storage medium. PCM is the used for storing the solar energy during sunshine
hours so that cooking in the evening time can be done. In the present study a box type solar cooker with magnesium nitrate hexahydrate as a energy storage medium with
melting point 89oC was designed, fabricated and tested so that cooking can be done at
evening and its performance is compared with solar box cooker without storage.
2. EXPERIMENTAL SETUP
The experimental work is performed in Solar Laboratory of Mechanical Engineering
department in SHIATS, Allahabad. The experimental test on box type solar cooker was performed during June 2016. Two similar solar box cooker was designed and
fabricated. Both boxes are made up of galvanized iron sheet. Model I and Model II has similar absorber plate consists of GI sheet painted black thus, increasing its
capability of absorbing incident solar radiation of surface area ( 0.75 m × 0.75 m) and only difference between them is that Model (II) absorber plate basin surface is
provided with fins made of GI painted black. Fins are of rectangular cross section (0.75 m by 0.01 m) and have a length of 0.020 m [9]. The top of the box is covered
with a clear window glass. Glass wool is used as an insulation material for delay of heat loss. The outer surface of the box and bottom surface of the boxes are insulated
by 5mm thickness glass wool insulation. The space between the inner and outer
surface of the concentric vessel is filled with PCM and is completely sealed. Both the solar box cookers were kept facing south direction. Figure 1 shows the photographic
view of box type solar cooker used in experiments.
Figure 1 Photographic view of box type solar cooker with glasswool insulation
Study of Box
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During all the experim temperature at different l
temperature, ambient temrecorded by Solarimeter a
efficiency. Stagnation tem vessel and with load. He
hexahydrate is used as phprovided in the middle of
water are kept in Model (I
(a)
Figure 2 (a) Photographi
2.1. Performance of sol
The figure of merit F1andFigure of merit F1 (
oC m2/W
F1=
Where Tp , Ta , Is are a
intensity on a horizontarespectively.
Figure of merit F2 or water
Where t1 and t2 is the
(m Cp)w is the product of tis given by Ademola K. e
exergy input.
!"!#$"! %
&
Cpw is specific heat of water
x Type Solar Cooker with Energy Storage Medium
rnal/IJARET 39 ed
ment on the both system thermocouple were u location such as absorber plate, water tem
mperature and solar intensity on a horizonta and these values are required to calculate F1
mperature is measured without load i.e. with ere two concentric vessel is taken and mag
hase change material which is filled at the f the two vessels and kept in Model II and n
).
(b)
hic view of concentric vessel with PCM (b) Systemconcentric vessel with PCM.
lar cooker:
F2 is given for box type solar cooker by MuW) or stagnation test is defined as
absorber plate temperature, ambient temper
al surface at a time stagnation temperatu
r heating test is defined as
'
time when water temperature reached Tw1 an
the mass of water and specific heat (J/oC). Ex
et al. [11] and it is calculated by dividing Ex
()*+&, -./0+0&
1
2345600789
56007:;
<=> (3) where mw is
, Twf is final temperature of water, Twi is initial t
m
used to measure
mperature, PCM
al surface were
1, F2 and exergy
empty cooking gnesium nitrate
base and space normal pot with
matic view of
ullick et al. [10]
(1)
rature and solar
ure is reached
(2)
and Tw2 in (oC),
xergy efficiency xergy output by
s mass of water,
temperature of
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water, t is time difference, TΔ a is the ambient temperature (K), Ts is the sun temperature (5800 K), Is is the solar radiation (W/m
2) and Asc is area of aperture of solar cookers.
3. RESULTS AND DISCUSSION The fig.3 shows the variation of solar intensity with respect to time on a particular day
during PCM test. It can be seen from the graph that maximum solar intensity is
received 1200 W/m2 at 10:30 and at 12:00 pm to 2:00 pm which is peak time for high
solar intensity.
Figure 3 Variation of solar intensity with respect to time on a particular day
0
20
40
60
80
100
120
Tem
per
atu
re (
oC
)
Time (hr)
Tw(pcm) T(pcm)
Tw(without pcm) Tp(pcm)
Tp(without pcm)
Figure 4 Variation of water temperature and plate temperature with and without PCM with
respect to time on a particular day
While doing energy storage medium test Model II has higher plate temperature
than the other Model I and during both days reading it is found that temperature increases during whole day and start decreasing from 1:30 pm for Model I and from
4:30 pm in Model II. Hence working time of Model II is more than Model I.
0
200
400
600
800
1000
1200
1400
Sola
r In
ten
sity
(W
/m2)
Time (hr)
Study of Box Type Solar Cooker with Energy Storage Medium
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Figure 4 Variation of exergy efficiency with respect to time with and without PCM on a
particular day
Fig. 4 shows the curve of exergy efficiency and time of Model II (with PCM) and Model II (without PCM) on a particular day. It is observed from the graph that
maximum value of efficiency is 0.7 which is found at 12:30 for Model II. Exergy efficiency of Model II (with energy storage medium) is found 439 % more than
Model I (simple cooking pot). This is due to two reasons - empty space minimization and due to thermal inertial effect.
4. CONCLUSION
In this paper, study of a solar box cooker is done and performance is compared
between MODEL I (simple cooking pots without energy storage medium) and MODEL II (with energy storage medium). For both systems, the figure of merits were
obtained. Exergy efficiency of MODEL II is found to be 439 % more than that of the MODEL I.
REFERENCES
[1] N.M. Nahar, Performance and testing of a hot box storage solar cooker. Energy conversion and management 44 (2003) 1323–1331.
[2] Adams W. Cooking by solar heat. Sci Am 1878; 38:376. [3] Ghai ML, Design of reflector type direct solar cooker. J Sci Ind Res 1953;1
2A:165–75.
[4] Ghai ML, Pandhar BS, Dass H. Manufacture of reflector type direct solar cooker. J Sci Ind 1953;12A:212–6
[5] Nahar NM. Performance and testing of an improved hot box solar cooker. ECM1990.
[6] Nahar NM, Marshall RH, Brinkworth BJ. Studies on a hot box solar cooker with transparent insulating materials. Energy Convers Manage 1994; 35:
784–91.
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8E
xer
gy e
ffic
ien
cy
Time (hr)
Exergy efficiency (PCM) Exergy efficiency(without PCM)
Shaili Sharma and Dr. Ajeet Kumar Rai
http://iaeme.com/Home/journal/IJARET 42 [email protected]
[7] Nahar NM. Design, development and testing of a double reflector hot box solar cooker with a transparent insulation material. Renew Energy 2001; 23:
167–79.
[8] Parikh M, Parikh R. Design of flat plate solar cooker for rural applications. In: Proceedings of the National Solar Energy Convention of India,
Bhavnagar, Central Salts and Marine Chemical Research Institute,
Bhavnagar, India, 1978. p. 257–61.
[9] Sonali Kesarwani, Ajeet Kumar Rai and Vivek Sachan, An Experimental Study On Box-Type Solar Cooker, International Journal of Advanced
Research in Engineering and Technology 6(7), Jul 2015, pp. 01–06,
[10] Mullick, S. C., Kandpal, T. C. and Saxena A. K. Thermal test procedure for box type solar cooker. Solar Energy, , 1987, pp. 353–360. 39
[11] Ademola K. Aremu, Joseph. C. Igbeka, Energetic and Exergetic Evaluation of Box-Type Solar Cookers Using Different Insulation Materials. ISASRI
9(5) 2015. P: 440-446
[12] Ajeet Kumar Rai, Nirish Ningh, Vivek sachan (2013)Experimental Study of a Single Basin Solar Still with Water Cooling of the Glass Cover, International
Journalof Mechanical Engineering and Technology 4 (6) 1-7.
[13] Ajeet Kumar Rai, Vivek Sachan and Bhawani Nandan. (2013), Experimental
study of evaporation in a Tubular solar still, International Journal of
Mechanical Engineering and Technology: 4 (2) 1-9.
[14] Ashish Kumar and Ajeet Kumar Rai, Comparative Study of Open Sun Drying & Solar Cabinet Drying Techniques for Drying of Green Chilies,
International Journal of Production Technology and Management (IJPTM),
7(1), 2016, pp. 18–26.
[15] Devashish Tiwari and Dr. Ajeet Kumar Rai, Effect of Sensible Energy Storage Medium on The Productivity of Solar Still. International Journal of
Mechanical Engineering and Technology, 7(4), 2016, pp. 1–7.
[16] Vivek Sachan and Ajeet Kumar Rai, Studies on Finned Basin Solar Still.
International Journal of Mechanical Engineering and Technology, 7(3), 2016,
pp. 119–124.
[17] Talal K. Kassem, Investigation of Solar Cooker with PCM Heat Storage For High Altitude Places (TAIF CITY), International Journal of Mechanical
Engineering and Technology, 3(3), 2012, pp. 555–564.
[18] Vivek Sachan and Ajeet Kumar Rai, Theoretical and Experimental Studies on Stepped Solar Still, International Journal of Mechanical Engineering and
Technology, 7(2), 2016, pp. 39-44
[19] S. Mathana Krishnan and V. Srinivasan, Modified Solar Collector Annexed with Residential Solar Cooker, International Journal of Mechanical
Engineering and Technology, 4(4), 2013, pp. 62–70.