Electrons can travel freely in the copper conductors but not so freely in the semiconductor. As the electrons leave the copper and enter the hot-side of the p-type, they must fill a "hole" in order to move through the p-type. When the electrons fill a hole, they drop down to a lower energy level and release heat in the process. Then, as the electrons move from the p-type into the copper conductor on the cold side, the electrons are bumped back to a higher energy level and absorb heat in the process. Next, the electrons move freely through the copper until they reach the cold side of the n-type semiconductor. When the electrons move into the n-type, they must bump up an energy level in order to move through the semiconductor. Heat is absorbed when this occurs. Finally, when the electrons leave the hot-side of the n-type, they can move freely in the copper. They drop down to a lower energy level and release heat in the process.

1. 11-Oct-16 1
Department of Electronics & Telecommunication Engineering
S. B. Jain Institute of Technology, Management and Research, Nagpur.
Session 2016-2017
Solar Based Smart Refrigerator
Presented by
Mitali Patle Radha Gulhane
Kshitij Rokade Tushar Kalamdar
Under the Guidance of
Prof. Rahul Hiware

2. Content
1. Introduction
2. Motive
3. Problem Solving
4. Block diagram
5. Equipments Used
6. Reference
11-Oct-16 2

3. Introduction
 Smart.
 Portable.
 Solar Based.
 Eco-friendly.
 Compact.
 Additional Features.
 LCD Display – 1. Temperature.
2. Free Slot Indicator.
3. Battery Indicator.
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4. Motivation
 Renewable source will be used so as to reduce the
alarming effect of global warming.
 Power crises can easily be minimised by this
technology.
 CFC gases , one of the main reason for depletion of
Ozone layer will not be a concern anymore.
11-Oct-16 4

5. Problem Solving
 Renewable resource which will be used is Solar
Energy.
 Our country is a tropical country and so we have
abundant amount of sunlight.
 Coolants will not be used in our project so there
will be no harm to the environment.
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6. Block Diagram
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7. Equipment's Used
 Micro-controller
 Peltier Plate
 Solar panel
 Battery
 LCD
 Relay
 Sensors
 Humidity
 IR
 Temperature
 Software tools
 Keil
 Proteus
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8. Reference
 http://www.kijiji.ca/v-electronics/kingston-
on/thermoelectric-peltier-module-12v-60w-tec1-2706-for-
experiments/1056587308
 http://www.electonicshub.org/temprature-sensors/
 http://www.engineersgarage.com/microcontroller/8051pro
jects
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9. Thank You
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