COOLING STORAGE FOR VEHICLES USING THERMOELECTRIC COOLER

The thermoelectric known as peltier uses the theory of peltier effect to produce
heat difference from an electrical voltage. Peltier is a semiconductor which consists of
two ceramic plates with p- and n-type semiconductor material (bismuth telluride)
between the plates. The project also uses a 28/40- Pin 8-bit microcontroller (PIC16F877)
to control the voltage controller and the LCD screen to display the temperature.
Experiment conducted on the pel tier shows that the surface temperature of the peltier can
reach a temperature of 14.4 °C by applying 8 volt to the peltier. After 500 seconds, the
temperature can reach a low temperature of 1 0.6°C. By implementing basic heat transfer
theory which includes conduction heat, convection heat and radiation heat to insulate the
heat; a working prototype was built. The inner box temperature dropped from 26°C to
13°C. Although the LCD screen displays a temperature of l3°C from the reading of the
temperature sensor (LM335DZ), it is important to take into consideration that the
efficiency of the temperature sensor is very low (15.8%) and the error rate is considerably
high (16.3%).