3. Results and Discussion
3.1 COP of TEC
The thermoelectric cooling was used electric power of 40 W. The TER without cooling fan for the coldness
circulates in a refrigerator. The relationship of temperature and time were measured for finding temperature
increases rate, difference temperature and calculation COP of TER. It results show that, the temperature inside
refrigerator was decreased with increasing time. The inside temperature of TER was decreased rate of 1.1 °C/min in
the time interval 0–20 minutes, the minimum temperature was -1.1 °C, COP about 0.6 for 2 hour as shown in Fig. 4.