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