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This paper comprises the Numerical study of various modules of first and second stage of peltier cooler to analyze that how the performance enhances when we shift from single stage to cascade thermoelectric peltier cooler. Multistage thermoelectric coolers have been used from long back as they offer a larger temperature difference than single-stage thermoelectric coolers. Apart from this multistage also helps in improving the COP and cooling load. The COP and heat load were analyzed for various temperature difference and it has been observed that they decrease with increase in temperature difference. For first stage COP ranges from 0.1 to 0.34 and cooling load maximum as 41.9 whereas for second stage COP maximizes to 0.56 and cooling load to 136.45. Nomenclature Q heat flow per unit time, heat power (W) COP coefficient of performance I electric current (A) Qh Peltier pellet hot side heat flow (W) Qc Peltier pellet cold side heat flow (W) Pin electric power supplied (W) RM thermal resistance (ohm) Vin voltage to the thermoelectric module (volt) SM Seeback coefficient (V/K) DT The temperature difference of cold and hot side Th hot side temperature (K) T12 Intermediate temperature between first and second stage in two stage cooler Tc cold side temperature (K) Ta ambient temperature (K) KM total thermal conductance (W/K) T module temperature for hot and cold side respectively (K) COPc coefficient of performance of thermoelectric cooling system Smth module Seebeck coefficient at the hot side temperature Th Smtc module Seebeck coefficient at the cold side temperature Tc S1 Seebeck coefficient of the 1st stage in volts/K S2 Seebeck coefficient of the 2nd stage in volts/K Rmth module resistance at the hot side temperature Th Rmtc module resistance at the cold side temperature Tc R1 resistance of the 1st stage in ohms R2 resistance of the 2nd stage in ohms Kmth thermal conductance at the hot side temperature Th Kmtc thermal conductance at the cold side temperature Tc K1 thermal conductance of the 1st stage in watts/K K2 thermal conductance of the 2nd stage in watts/K Snew Seebeck coefficient for the new module Rnew electrical resistance of the new module Knew thermal conductance of the new module Nnew number of couples in the new module International Journal for Research in Applied Science & Engineering Technology (IJRASET) ISSN: 2321-9653; IC Value: 45.98; SJ Impact Factor: 7.177 Volume 7 Issue V, May 2019Available at www.ijraset.com 2773 ©IJRASET: All Rights are Reserved 2773 Inew optimum or maximum current of the new module

Effect of Cascading the Thermoelectric Peltier Cooler on COP and Cooling Load