This document summarizes a student project to design a solar-powered heating system for lunch boxes. It includes sections on the introduction, literature review, components of the system, how heating works, benefits of solar heating, and experimental results testing the heating of a nichrome coil. The project aims to create sustainable energy and a heating system using solar panels, batteries, a nichrome coil, and portable container to keep food warm for lunch hours later while maintaining food safety. Experimental results show the coil can reach over 150°C when half or less of its length is used and powered by 12-17 volts from the solar system.

1. Solar Operated Heating System of
lunchbox
GROUP MEMBERS
DSE-07 Aditya Sakpal
DSE-17 Prithviraj Dhuri
DSE-21 Rucha Bagade
DSE-33 Jay Bagwe
Guide:-Ms. Madhumita Dutta

2. INTRODUCTION
• Nowadays solar energy is good and clean source of energy
due to its high efficiency and safety.
• So using solar panel to create electric anergy.
• It's a simply Heating system by using nichrome wire as a
heating element.
• The main aim of the project is to create sustainable
energy and design and fabricate heating system.

3. Literature review :
Development and investigative studies on solar hot case food
warmer for food at offices/industrys
Sengar · Yogita Meena · Archana Singh Received: 12 May 2021 / Accepted: 31 January
2022 © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part
of Springer Nature 2022
Abstract : The paper presents the design, development and investigative studies into
the use of a solar hot case/food warmer. The solar hot case can prove to be highly
useful to the persons who carry hot food to their workplaces for lunch and eat it 4–5 h
later. It can help keep food warm and infection free, by maintaining the food at an
elevated temperature. The solar hot case has been developed with a total aperture area
of 0.673 m2. The energy requirements for food warming have been calculated and
found to be around 62 kJ in summer and 90 kJ in winter for an average lunch box of
mass 0.25 kg containing 0.4 kg of food. The design of the solar hot case has been
prepared on the basis of the food warming calculations to allow around ten lunch boxes
to be warmed simultaneously.

4. Different Parts of Solar Heating system
 Solar panel
 Battery.
 Nichrome coil.
 Portable container alloy.
 White Paraffin wax.

5.  Heat generation occurs inside the part.
 Method can provide very high power densities.
 Heating may be highly selective in the depth
and along the surface.
 Any processing atmosphere (air, vacuum).
 Very high temperature may be created.
 Stand-by losses of equipment are very low.
 Fast start-up.
 Heating may be easily programmed and
automated.
 No pollution of surrounding space.
 Compare to safe gas heating.
Specific Features of Heating

6. Benefits of solar heating
 Endless amounts of energy, free of charge
 No CO2 emissions during operation
 Cost savings: up to 60% less energy to heat water, up to
35% less energy for space heating
 Reduced consumption of fossil fuels
 Solar thermal systems can be integrated into existing
systems
 Modern systems work efficiently even in winter

7. Advantages of induction heating :-
 Solar heating is quick & clear.
 There is no wastage of heat in solar heating.
 Temperature control method is very easy.
 Good control and repeatability.
Disadvantages of Induction Heating :-
 Cost of the equipment and the cost of the process are very high.
 Efficiency of heating is poor being less than 50% in many cases.
 Heating will be more in regions of the work piece closer to heating coil.
 That means heating takes place in non uniform manner.

8. Nichrome coil
 The nichrome (also known as NiCr, nickel-
chromium or chromium-nickel) wire is
made up of alloy having the high resistivity,
So its having high resistance.
 Because of its low cost of manufacture,
strength, ductility, resistance to oxidation,
stability at high temperatures, nichrome is
widely used in electric heating elements in
applications such as hair dryers and heat
guns.
 High voltage flowing through it get
heated become bright red.
 It has a high Melting point of about
1,400°C.

9. Heat measurements readings
room temperature-30°c ,length of coil- 17inch
Length of coil Volts Ampere Temperature Time
Full 12.0 0.33 35°c 5min
Full 15.0 0.42 38°c 4min
Half 12.6 0.86 61°c 2min
Half 15.0 1.019 82°c 2min
Half 17.0 1.167 101°c 2min
Quarter 12.0 1.87 150°c 2min
Half Quarter 6.9 1.83 183°c 2min

10. Solar Heating System

11. Thank you………