IMPLEMENTATION OF SOLAR FRIDGE WITH FAST CHILLING APPLICATIONS WITH TEMPERATURE MONITORING

1
IMPLEMENTATION OF SOLAR FRIDGE WITH FAST
CHILLING APPLICATIONS WITH TEMPERATURE MONITORING

• Using the sun to generate electricity

2
INRODUCTION

• In Todays world global warming is being
  increasing year by year. There are many reasons
  like pollution, deforestation, water
  contamination, etc...In coming years the major
  problem before us is depletion of ozone layer
  which is caused by the release of CFCs.
• Some of the equipments which cause this effect
  are refrigerators, ACs. In this project we are
  mainly focusing on a solution to control this
  problem we have focused on refrigerators which
  releases CFCs.
• Here we are designing a mini solar based
  refrigerator which is cheaper as well as
  eco-friendly.

3
BLOCK DIAGRAM-
4

WORKING -

• Here we are using Micro controller
  (AT89S52) allows dynamic and faster control.
  Liquid crystal display (LCD) makes the system
  user-friendly. The sensed and set temperature
  values are simultaneously displayed on the LCD
  panel.
• In this project we are using solar panels
  for charging a Lead Acid Battery (12V, 1.2 Amp
  hrs), a pelteir thermoelectric device which when
  connected to battery generates cooling effect on
  one side and heat is dissipated on other side
  through heat sink, a cooling fan is used for
  dissipating the heat from the heat sink. A
  regulator 7803 is used to drive the internal
  cooling fan and LED.
• The temperature sensor LM35 senses the
  temperature and converts it into an electrical
  signal, which is applied to the micro controller
  through ADC. The analog signal is converted into
  digital format by the analog-to-digital converter
  (ADC). The sensed values of the temperature are
  displayed on the 16x2-line LCD. The temperature
  range of the sensor is 10C to 2550C.

5
The main task has been to develop a new cooler,
which fulfill the current WHO requirements for
vaccine coolers with battery back up, as no
standard exist for the battery less type.
According to these guidelines the design
temperature interval is 0 ºC to 8 ºC. The
vaccine must also be kept cool for four days
without power, and this is the sizing criteria
for the ice storage in the cooler.
6
(No Transcript)
7
The reason for choosing energy storage in ice was
to avoid a lead battery for energy storage. Lead
batteries tend to deteriorate, especially in hot
climates, or they are misused for other
purposes. This makes it necessary to install a
new battery after a couple of years, and has in
practise been an obstacle for the use of solar
powered refrigerators.
8
SOLAR CELL DESCRIPTION
9

• The solar cell is composed of the semiconductors
  of the P-N junctions.
• It can convert light into electric energy.
  Therefore we can assume that electricity produced
  using sunlight shining on the solar cell can be
  used like common electricity.

10
Lead Acid Battery
Specifications 12V 1.3Ah sealed lead acid
battery 1. CE and RoHs 2. high quality and
relaibility 3. miantenance free 4. long life
cycle 12V 1.3Ah sealed lead acid battery General
Features Sealed and maintenance free
operation. Non-Spillable construction design. ABS
containers and covers(UL94HB, UL94-0)optional. Saf
ety valve installation for explosion proof. High
quality and high reliability. Exceptional deep
discharge recovery performance. Low self
discharge characteristic. Flexibility design for
multiple install positions.  
11
Fridge

• Features
• Cools a beverage from 5V USB Power
• Stylized as a mini fridge
• Holds one can
• Internal LED light
• USB powered
• No batteries required

12

• Plug and play
• Temperature of cooling pad decreases to 8.5
  degrees after 5 mins
• Dimension 19.4x9x9cm
• Weight 362g

13
(Fire Detector)TEMPERATURE SENSOR

• Features
• Calibrated directly in Celsius
  (Centigrade)
• Linear 10.0 mV/C scale factor
• 0.5C accuracy guaranteeable (at 25C)
• Rated for full -55 to 150C range
• Suitable for remote applications
• Low cost due to wafer-level trimming
• Operates from 4 to 30 volts
• Less than 60 µA current drain
• Low self-heating, 0.08C in still air
• Nonlinearity only 1/4C typical
• Low impedance output, 0.1 W for 1 mA load

14

• Absorption coolers are used for both vaccine
  storage and for household applications and
  obviously needs regular supply of fuel.
  Furthermore, they are difficult to adjust, which
  does often result in destructive freezing of the
  medicine.
• So far, two generations of prototypes have
  been build and tested in climate chamber at the
  DTI and an advanced control were build with the
  purpose to control the temperature in the cooler
  and the speed of the DC-compressor in order to
  exploit maximum power from the solar panels.

15
Highlights
Unit runs on a single 70 Watt/Ref 1.5 KW/AC
module in most climates Fast cooling due to
compressor speed control Low maintenance and
easy to clean
16
Features A cooling technology Lockable
lid Compressor speed control Automatic
selection of 12V / 24V Temperature fully
programmable Fridge or Freezer in one cabinet
Applicable for all DC applications
17

10 WAYS TO USE SOLAR ENERGY AROUND YOUR HOME

Your outdoor lights Your pool and hot tub Use a
solar oven Use passive heat storage tubes to
increase and store solar energy  Use solar
chargers to charge your MP3 player Use solar
powered appliances Heat your water with solar
power Use solar indoor lights Try using solar
powered electronics A solar power generator
18
Advantages

•  
• Portable solar fridges
• Ease of installation to save time and money
• Included mounting back plate
• Included communication ports
• Included LCD display with back-light for 24 hour
  display viewing
• High efficiency and outstanding energy harvest in
  a small modular design
• Fast cooling due to compressor speed control
• Low maintenance and easy to clean

19
Applications

• Chilling cold drink cans
• For household applications
• For medical applications
• Can be used for instant heating applications

20
Conclusion

• The project is useful for the instant
  chilling/hot applications. Experimental work has
  been carried out carefully. The result shows that
  higher efficiency is indeed achieved using the
  embedded system according to requirement of the
  user.