The refrigeration system of thermoelectric refrigerator (TER; 25 × 25 × 35 cm3) was fabricated by using a thermoelectric cooler
(TEC; 4 × 4 cm2) and applied electrical power of 40 W. The TER has not cooling fan for the coldness circulates in the
refrigerator. The temperature of TER was measured at ten points to check the cooling system. The current, differential
temperature, time, and coefficient of performance (COP) were analyzed. TEC cold plate temperature (Tc) was decreased from 30 ºC
to –4.2 ºC for 1 hr and continuously decreasing to –7.4 ºC for 24 hrs and 50 ºC for hot plate temperature (Th). The TER
temperature was decreased from 30 ºC to 20 ºC in 1 hr and slowly decreasing temperature for 24 hrs. The maximum COP of TEC
and TER were 3.0 and 0.65, respectively