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International Journal of Mechanical Engineering and Technology (IJMET), ISSN 0976 –
6340(Print), ISSN 0976 – 6359(Online) Volume 4, Issue 4, July - August (2013) © IAEME
53
MODIFIED SOLAR COLLECTOR ANNEXED WITH RESIDENTIAL SOLAR
COOKER
S. Mathana Krishnan1, V. Srinivasan
2
1Mechanical Department, Thiagarajar college of Engineering, Madurai, Tamilnadu, India
2Mechanical Department, Thiagarajar college of Engineering, Madurai, Tamilnadu, India
ABSTRACT
In this modernized world, energy is the major prerequisite for the ballgame of equipments
without which man cannot survive. Solar energy is very abundant and everlasting comparable to all
other energies. Scientists and researchers are still being inquired to harness the full potential of the
solar radiation. By focusing sunrays to a point or line, lavish amount of heat energy is generated
which is used for the cooking purpose. The predicament of solar cooker is that cooking has to be
taken place under direct sunlight and absence of night time cooking. Recent developments are in
progress to make possibility of residential solar cooker. This paper eliminates the predicaments of
residential solar cooking in night time and also increases the efficiency of cooking by introducing
vacuum tubes for better heat absorption and insulation. Phase change materials (PCM) are used for
better heat storage medium as a backup for night time cooking. Factors like energy requirement,
processing time, design for heat ex-changers, volume of PCM required, mass flow rate of water etc.,
are considered to design the system for a domestic house. Finally, this solar cooker can be the
substitute for all other cooking systems and mainly reduces pollution because of LPG, kerosene,
wood etc., which is used as a cooking fuel.
Keywords: Solar energy, Vacuum tubes, Phase change materials, Reduces pollution, Night time
cooking, Designing the system.
I. INTRODUCTION
Energy is strewn all over the world whose ubiety is very immense. Man has perpetually
yearned to capture it and utilize it for humans. The necessity of energy escalates from day to day but
legion of the fossil fuels and conventional fuels fire up to extinct. Most of the relic fuels are
consumed for the cooking purpose. Cooking using solar energy is the peerless surrogate for tackling
LPG demand if its efficiency is aggrandized and it also has zero pollution. Its hefty advantage is that
the rays of sun are very intensive and it has the adequacy to do any work but it relies upon the way
INTERNATIONAL JOURNAL OF MECHANICAL ENGINEERING
AND TECHNOLOGY (IJMET)
ISSN 0976 – 6340 (Print)
ISSN 0976 – 6359 (Online)
Volume 4, Issue 4, July - August (2013), pp. 53-61 © IAEME: www.iaeme.com/ijmet.asp Journal Impact Factor (2013): 5.7731 (Calculated by GISI) www.jifactor.com
IJMET
© I A E M E
International Journal of Mechanical Engineering and Technology (IJMET), ISSN 0976
6340(Print), ISSN 0976 – 6359(Online) Volume 4, Issue 4, July
and effectiveness by which energy is extracted.
type of solar cookers are used, but these cookers are not successful. This is because of the
predicaments to cook under direct sunlight and also the absence of solar energy at night time which
made us to rely on other conventional cooking systems.
inputs heat energy but the major detriment is that it has only low efficiency and sluggish processing.
This paper primarily focuses on residential
tube crammed with phase change materials
that it absorbs heat energy by incident solar irradiation, that travels through
glass tube and it traps the infrared radiation in solar rays. These trapped radiations are converted to
heat energy. This heat energy does not travel through vacuum expect radiation losses. But this
radiation loss is negligible due to small temperature difference. Hence in vacuum tub
heat energy will not be transmitted to the atmosphere.
so heat storage medium is obligatory.
Phase change material is the
resources because it delivers the stored latent heat energy at a particular (constant) melting point
temperature. The efficiency of the solar cooker is
placement of vacuum tube along with phase change material. This d
efficiently but also stores the heat for the future usage.
water or steam is circulated for cooking the
condensation of wet mixture of water vapour
phases. The circulation of water procures higher temperature for the food to cook and phase change
materials stores the heat for the time in the absence
II. DESCRIPTION
International Journal of Mechanical Engineering and Technology (IJMET), ISSN 0976
6359(Online) Volume 4, Issue 4, July - August (2013) © IAEME
54
and effectiveness by which energy is extracted. At beginning box type, panel types, paraboloidal
type of solar cookers are used, but these cookers are not successful. This is because of the
predicaments to cook under direct sunlight and also the absence of solar energy at night time which
ly on other conventional cooking systems. There is also variety of appliances which
heat energy but the major detriment is that it has only low efficiency and sluggish processing.
focuses on residential solar cooker with night time backup by means of
with phase change materials. The intention for choosing black layered
incident solar irradiation, that travels through the vacuum jacketed
infrared radiation in solar rays. These trapped radiations are converted to
heat energy. This heat energy does not travel through vacuum expect radiation losses. But this
radiation loss is negligible due to small temperature difference. Hence in vacuum tub
heat energy will not be transmitted to the atmosphere. The entire heat cannot be utilized at once and
so heat storage medium is obligatory.
Phase change material is the most admirable heat storage medium compared to other
cause it delivers the stored latent heat energy at a particular (constant) melting point
. The efficiency of the solar cooker is significantly amplified by means of the design and
placement of vacuum tube along with phase change material. This design not only heats the cooker
the heat for the future usage. The cooker is enclosed by
cooking the food. The small tank is sited next to the cooker for the
mixture of water vapour because no pump will handle both liquid and vapour
The circulation of water procures higher temperature for the food to cook and phase change
es the heat for the time in the absence of solar irradiation.
International Journal of Mechanical Engineering and Technology (IJMET), ISSN 0976 –
August (2013) © IAEME
At beginning box type, panel types, paraboloidal
type of solar cookers are used, but these cookers are not successful. This is because of the
predicaments to cook under direct sunlight and also the absence of solar energy at night time which
also variety of appliances which
heat energy but the major detriment is that it has only low efficiency and sluggish processing.
by means of vacuum
layered vacuum tube is
the vacuum jacketed
infrared radiation in solar rays. These trapped radiations are converted to
heat energy. This heat energy does not travel through vacuum expect radiation losses. But this
radiation loss is negligible due to small temperature difference. Hence in vacuum tubes the absorbed
The entire heat cannot be utilized at once and
heat storage medium compared to other
cause it delivers the stored latent heat energy at a particular (constant) melting point
by means of the design and
esign not only heats the cooker
jacket where hot
next to the cooker for the
use no pump will handle both liquid and vapour
The circulation of water procures higher temperature for the food to cook and phase change
International Journal of Mechanical Engineering and Technology (IJMET), ISSN 0976
6340(Print), ISSN 0976 – 6359(Online) Volume 4, Issue 4, July
Cooking is vital and it has to
from either LPG or electricity. Troubles will be
The effective cooking is also done by the alternative resources like solar energy which is explained
below. The intact unit consists of vacuum tubes, phase change materials, cooker surrounded by the
jacket, small tank, insulated tubes
assumptions of 5 persons in a domestic house.
with phase change material within that copper tube
are positioned in either side with a centre cube of phase change materials.
PCM is that it has superior latent heat storage.
According to the pondered volume,
excess PCM is placed inside the insulated cubical box at
has lower value of surface area to volume (SA/V) ratio compared to other standard shapes. Hence
heat loss will be minimum at the night time.
which is bent for greater surface contact and to enhance the
promulgated inside the copper tube. This entire setup is
collector. The area of parabolic collector is calculated by
unit area and the energy required. Seven coils of copper tube are
contact in the cube of phase change material located in the centre.
cooker for condensation of the wet mixture.
completes one cycle. The temperature of water increases
cooker. If this system is erected in the universe
demand. By eliminating the usage of LPG
III. WORKING
The entire arrangement works by utilizing heat from the solar
relies upon the effective ways which harness the full potential of the sun. The parabolic collector is
selected for the rationale of obtaining line focus in it. The pa
converge it into a line where the vacuum tube
Copper tubes are mounted inside the phase change material
circulated inside the copper tube which absorbs the h
the vacuum tube, cube of PCM is located
International Journal of Mechanical Engineering and Technology (IJMET), ISSN 0976
6359(Online) Volume 4, Issue 4, July - August (2013) © IAEME
55
to be done in all places. Energy required for this operation is only
Troubles will be faced in the production of both LPG and electricity.
The effective cooking is also done by the alternative resources like solar energy which is explained
consists of vacuum tubes, phase change materials, cooker surrounded by the
insulated tubes and parabolic collector. The system is designed with the
assumptions of 5 persons in a domestic house. The vacuum tubes of size 124 mm diameter
with phase change material within that copper tube arrangements are made. The two
in either side with a centre cube of phase change materials. The intent
latent heat storage. The volume of phase change material is
phase change materials are crammed in two vacuum tube
excess PCM is placed inside the insulated cubical box at the centre. The cubical box is chosen as it
has lower value of surface area to volume (SA/V) ratio compared to other standard shapes. Hence
heat loss will be minimum at the night time. The copper tubes are placed inside the vacuum tube
which is bent for greater surface contact and to enhance the better heat transfer and
ed inside the copper tube. This entire setup is positioned in the line focus of the parabolic
The area of parabolic collector is calculated by considering available solar irradiation
. Seven coils of copper tube are to be found for better surface area
hase change material located in the centre. The small tank is
wet mixture. A pump is also built-in for the circulation of water and it
completes one cycle. The temperature of water increases aggressively and it cooks the food in the
cooker. If this system is erected in the universe, we can easily face the LPG and electrical power
eliminating the usage of LPG, we can control the carbon emissions in large quantity.
works by utilizing heat from the solar irradiation and the efficiency
ways which harness the full potential of the sun. The parabolic collector is
of obtaining line focus in it. The parabolic collector reflects sun rays and
converge it into a line where the vacuum tube packed with phase change material
mounted inside the phase change material. The water as a working substance is
which absorbs the heat extracted by the vacuum tube
located which is well insulated from the surroundings which also
International Journal of Mechanical Engineering and Technology (IJMET), ISSN 0976 –
August (2013) © IAEME
Energy required for this operation is only
in the production of both LPG and electricity.
The effective cooking is also done by the alternative resources like solar energy which is explained
consists of vacuum tubes, phase change materials, cooker surrounded by the
The system is designed with the
diameter are filled
two vacuum tubes
intent for choosing
volume of phase change material is calculated.
vacuum tubes and
The cubical box is chosen as it
has lower value of surface area to volume (SA/V) ratio compared to other standard shapes. Hence
The copper tubes are placed inside the vacuum tube
t transfer and water is
in the line focus of the parabolic
solar irradiation per
for better surface area
The small tank is sited next to the
for the circulation of water and it
aggressively and it cooks the food in the
and electrical power
, we can control the carbon emissions in large quantity.
radiation and the efficiency
ways which harness the full potential of the sun. The parabolic collector is
rabolic collector reflects sun rays and
with phase change material is positioned.
. The water as a working substance is
eat extracted by the vacuum tube. In between
which is well insulated from the surroundings which also
International Journal of Mechanical Engineering and Technology (IJMET), ISSN 0976 –
6340(Print), ISSN 0976 – 6359(Online) Volume 4, Issue 4, July - August (2013) © IAEME
56
plays an effective role in heat transfer. Hot water is transferred to the cooker by insulated pipes to
eliminate transmission heat loss. Due to the solar irradiation, water gets heated up in step by step
process. This hot water is made circulated through the jacket in the cooker. The small tank is sited
next to the cooker for the condensation of the wet mixture of water vapour. A pump is used to drive
the system of fluids. A valve is fitted for the adjusting of mass flow rate of water. This mass flow
rate will controls the cooking temperature. If the mass flow rate is higher, it obtains lower cooking
temperature and vice versa. This system surely meets the demand of LPG and power consumption
and it also reduces pollution.
IV. CALCULATION
Assumptions 1) It is assumed that 7L cooker is suited for 5 people in a house
2) The cooking food is considered to be water
3) The location for cooking is chosen to be Madurai, Tamilnadu, India
4) It is assumed that maximum final temperature of the food is 130-150oC
5) Parabolic collector to be designed for PCM to attain maximum temperature of 160oC
6) Optimum melting point of PCM is 120oC
7) Time required to cook food during night time is assumed to be 1½ hours
1. Energy required to cook food Volume of the Cooker V = 0.007 m
3
For water,
Density = 1000 kg/m3
Mass m = 7 kg
Specific heat (at constant pressure) Cp = 4.187 kJ/kg K
Initial temperature of food TA = 30oC (room temperature)
Maximum final temperature of food TB = 130oC
Temperature difference dT = 100oC
Required heat energy Q = m * Cp * dT
= 7 * 4.187 *100
Q = 2930.9 kJ
2. Time for backup Due to absence of sunlight during night time cooking,
let maximum time required to cook during night time = 1 ½ h
3. Temperatures
Maximum Cooking temperature T1 = 150oC
Maximum temperature of PCM T2 = 160oC
4. PCM selection Required melting point of PCM = 120
oC
Name = S117
Melting point = 117oC
Density � = 1450 kg/m3
Latent heat L = 160 kJ/kg
Specific heat capacity Cp = 2.61 kJ/kgK
Thermal conductivity k = 0.7 W/mK
International Journal of Mechanical Engineering and Technology (IJMET), ISSN 0976 –
6340(Print), ISSN 0976 – 6359(Online) Volume 4, Issue 4, July - August (2013) © IAEME
57
5. Mass of PCM Heat energy required to boil 1L q = 291.14kJ
By experiment,
Time taken to reach boiling point of water = 20 min
For 20 min energy supplied = 291.14 kJ
Let us assume backup time t = 1 ½ h
For 1 ½ h energy required Q = 1310.13 kJ/L
For 7 Litre,
Total energy required Q = 9170.91 kJ
Q = m * L
m = Q/L
m = 57 kg
6. Design Calculation
Available vacuum tubes diameter
S.No Diameter (mm) Volume occupied by
PCM (kg)
1 37 3
2 64 10
3 124 25
Mass of PCM occupied in single vacuum tube (124mm dia) m1 = 25 kg
Mass occupied by copper pipe in single vacuum tube m2 = 5 kg
Difference in the mass dm = 20 kg
Mass of PCM that can be filled in a single vacuum tube = 20 kg
By placing 2 vacuum tubes i.e., No. of vacuum tubes n = 2
Total mass of PCM that can be filled in vacuum tubes = 40 kg
Total mass of to be filled to get 1 ½ h backup = 57 kg
Remaining volume of PCM = 17 kg
17 kg of PCM can be filled in a cube of side 23 cm
Copper pipe is coiled in that cube of PCM
7. Design of coil
Assumptions � Copper pipe diameter d = 12 mm
� Coil diameter D = 150 mm
� Free gap G = 10 mm
� No. of turns n = 7
� Secondary Length of the coil l = 100 mm
• Total length of the coil,
L = n * ((2 * π * r) + G) + (2 * l)
L = 53 cm
International Journal of Mechanical Engineering and Technology (IJMET), ISSN 0976
6340(Print), ISSN 0976 – 6359(Online) Volume 4, Issue 4, July
8. Mass of CO2 emission by LPGLPG contains 70% propane and 30% butane.
The chemical reactions are
Propane:
C3H8+5O2 � 3CO2+4H2O
Butane:
2C4H10+13O2 � 8CO2+10H2
By atomic weight calculation,
It is found that 1 ton of LPG emits 3.04
RESULTS AND DISCUSSION
The above graphs shows the temperature readings in Madurai with average day time
temperature as maximum temperature and minimum temperature to be a night time temperature.
This graph shows that there will be enough solar irradiation in the tropical region
to implement the steam cooking which is more suitable for houses and also hotels.
International Journal of Mechanical Engineering and Technology (IJMET), ISSN 0976
6359(Online) Volume 4, Issue 4, July - August (2013) © IAEME
58
emission by LPG LPG contains 70% propane and 30% butane.
2O
atomic weight calculation,
und that 1 ton of LPG emits 3.04 ton (approx) of CO2
The above graphs shows the temperature readings in Madurai with average day time
temperature as maximum temperature and minimum temperature to be a night time temperature.
This graph shows that there will be enough solar irradiation in the tropical regions especially in India
to implement the steam cooking which is more suitable for houses and also hotels.
International Journal of Mechanical Engineering and Technology (IJMET), ISSN 0976 –
August (2013) © IAEME
The above graphs shows the temperature readings in Madurai with average day time
temperature as maximum temperature and minimum temperature to be a night time temperature.
s especially in India
International Journal of Mechanical Engineering and Technology (IJMET), ISSN 0976
6340(Print), ISSN 0976 – 6359(Online) Volume 4, Issue 4, July
The calculation is performed for above all assumptions and the total system is designed for
the domestic house. From the graph, it is foun
hence it meet the cooking requirements by adopting the above design
will be little more investment than other systems. But
which total cost of cooking will be only the maintenance cost of the system. By improving the design
of vacuum tubes, PCM selection, tracking mechanism collector shapes etc., will have a great scope
in the market. In future this would be a new backu
multi purposes.
V. CONCLUSION
As our demand for LPG and electrical energy are escalating day by day, the amount of fossil
fuel will become scarce on one day. By implementing this system, it eradicate
for cooking. The key behind this efficacious solution is the p
papers, the overall system will work only during the daytime
then it will not be compact and there will b
cooker in each and every house will replace LPG and electric stove. Installation of this system in
India reduces more than millions of
temperature can be greatly reduced in the future.
to this hectic world. The effects of thermo physical properties of PCM, installation methodology,
location of PCM are the scope for future work
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International Journal of Mechanical Engineering and Technology (IJMET), ISSN 0976
6359(Online) Volume 4, Issue 4, July - August (2013) © IAEME
59
The calculation is performed for above all assumptions and the total system is designed for
the domestic house. From the graph, it is found that the average day temperature of Madurai is
hence it meet the cooking requirements by adopting the above design. The drawbacks in this system
will be little more investment than other systems. But the payback period will be few years
which total cost of cooking will be only the maintenance cost of the system. By improving the design
of vacuum tubes, PCM selection, tracking mechanism collector shapes etc., will have a great scope
In future this would be a new backup storage collector which stores heat energy for the
As our demand for LPG and electrical energy are escalating day by day, the amount of fossil
fuel will become scarce on one day. By implementing this system, it eradicates power consumption
is efficacious solution is the phase change material. In previous
papers, the overall system will work only during the daytime and if PCM is kept inside the house
then it will not be compact and there will be many predicaments. By adopting this residential solar
cooker in each and every house will replace LPG and electric stove. Installation of this system in
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International Journal of Mechanical Engineering and Technology (IJMET), ISSN 0976 –
August (2013) © IAEME
The calculation is performed for above all assumptions and the total system is designed for
d that the average day temperature of Madurai is 35oC
. The drawbacks in this system
will be few years after
which total cost of cooking will be only the maintenance cost of the system. By improving the design
of vacuum tubes, PCM selection, tracking mechanism collector shapes etc., will have a great scope
p storage collector which stores heat energy for the
As our demand for LPG and electrical energy are escalating day by day, the amount of fossil
power consumption
aterial. In previous
and if PCM is kept inside the house
By adopting this residential solar
cooker in each and every house will replace LPG and electric stove. Installation of this system in
emissions. The rise in the rate of global warming
could bring extravagant changes
to this hectic world. The effects of thermo physical properties of PCM, installation methodology,
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International Journal of Mechanical Engineering and Technology (IJMET), ISSN 0976 –
6340(Print), ISSN 0976 – 6359(Online) Volume 4, Issue 4, July - August (2013) © IAEME
60
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