SOLAR SEMICONDUCTER REFRIGERATOR

GUIDED BYKAVYA. K

ASSISTANT PROFFESSOREEE DEPARTMENTN!CE CHALAKUDY

GROUP MEMBERSRAGIL K.G (NLAMEEE005)SEBIN.K.B (NLAMEEE006)VIJIL.K.V (NLAMEEE008)VINOD.P.B (NLAMEEE012)

Overview• Introduction• Aim of The Project• Block Diagram• Circuit Diagram• Working• Components• Pros and Cons• Future Scope of The Project• Conclusion• References

Introduction

• Refrigeration is a process in which work is done to move heat from one location to another.

•Conventional Refrigerator works on the principle of Cooling through Evaporation.

•A cooling liquid absorb heat from subject, By which it is cooled.

Aim of Our Project

•To achieve Refrigeration through Semiconductor Devices, which takes less electrical energy.

•With the use of Renewable energy sources, supply is given to the system.

Block Diagram

Solar Panel

Buck Convertor Battery

Microcontroller

Microcontroller

Solar Tracking System

Peltier Module

REFRIGERATO

R

Circuit Diagram

Working

• Part 1

1. Solar energy is converted to Electrical energy by Solar Panel.

2. 20v dc converted to 14v by means of Buck Convertor.

3. This will charge the Battery.

4. Microcontroller will work from Battery.

Working

• Part 2 (Temperature Control)

1. Set a Desired Temperature with Potentiometer.

2. Microcontroller will compare this temperature with the inside temperature.

3. If they are Equal the Peltier will OFF.

4. If they are not Equal Peltier will kept ON.

Components

• Solar Panel• Buck convertor• Battery• Microcontroller• Peltier Module• Solar Tracking

Components

1. Solar Panel-Solar Panel is a combination of large number of Solar Cells

-Energy from solar light is directly converted to electrical energy by Solar Photovoltaic Cell(PV Cell)

Components

1. Solar Panel

- Photovoltaic effect.- Three Steps 1. The absorption of light

2. Generating electron-hole pairs. 3. The separation of charge carriers of

opposite types.

Components

1. Solar Panel

- Peak Power(Pmax)=10w

- Max.Power Current=1.02A

- Max.Power Voltage=17.66v

- Dimension=335*255*8(in mm)

Components

2. Buck Convertor

- Simplest way to reduce the voltage of a DC supply.

- 20v to 14v convertor(here).

Components

2. Buck Convertor (Working)

Components

2. Buck Convertor

- Duty Ratio=0.7

- Switching Frequency=15kHz

- Inductor=1.5mH

- Capacitor=1000microFarad

Components

3. Battery

- The role of battery is storage energy, when solar cell converted and to keep power supply at any time to load

- 12v Battery

Components

3. Battery

- Lead Acid Rechargeable Battery

- 7Ah per 20hr

Components

4.Microcontroller

- ATMEGA328

- 8 Bit 32 kb microcontroller

- Operates between 1.8-5.5v

Components

4.Microcontroller

- 28 pin DIP

- 6 PWM Output Pins

- 16Mhz Crystal Oscillator

Components

4.Microcontroller (Pin Diagram)

Components

4.Microcontroller

-Two Type Control

1.Solar Tracking System

2.Cooling System

Components

5.Peltier Module -Peltier Effect

Components

5.Peltier Module

- TEC-12706

- Operating Voltage=12v

- Operating Power=90w

- Operating Range=-40 C to +90 C

Components

6.Solar Tracking

- To get Maximum efficiency we introduce Solar Tracking for the system.

- With 4 LDRs and 3 Servomotors

- Circuit Diagram

Pros and Cons

• Pros- High Power Consumption- Renewable Energy Source- Portable One- Pollution Free

• Cons-High Cost-Less Efficiency-Less Dependable

Future Scope

• With MPPT, we can improve Efficiency of Solar Panel.

• Large number of Peltier Modules leads to Better Cooling.

• Improvement in cooling system for Peltier, can improve its Efficiency.

Conclusion

• In Conventional Refrigerators, Pollution due to CFCs are more. With Semiconductor Refrigerator we can avoid that.

• energycrisis

References

[1] Jinfa Qian, Yaping wang and Huixiang Qian, “Analysis of PV industry development,” Electrical, pp: 1-4, January 2009. [2] RuiDuan, “The characteristics and the status quo on solar semiconductor refrigeration technology,” Journal of Shanghai Electric University, Vol. 25, no.1, pp. 75-78, February 2009. [3] W Stephen Woodward, North Carolina Chapel Hill, “Seebeck voltage by sampling to achieve temperature precision control,” EDN China, pp. 70, February 2009. [4] Hui Zhang, Meihong Wang, Hong Wu and Jianxin Li. “Discussion about Solar Semiconductor Refrigeration System,” Energy Research and Utilization, pp. 26-28, May 2008. [5] Feng Gao, “Decrypt the latest solar power generation,” Invention and Innovation, pp. 53, January 2009.

Thanks