... pp. 18- 27. Penn A. (1 974 ). Small electrical power sources, Phys. Technol, 5, 114,1 974 . Priya S., Inman D. J. (2009). Energy Harvesting Technologies, Springer, 2009, ISBN 978 -0-3 87- 76 463-4. ... 1995, pp. 6 47- 655. Wey T. (2006). On the Behavioral Modeling of a Thermoelectric Cooler and Mechanical Assembly, IEEE North-East Workshop on Circuit and Systems, 2006, pp. 277 -280. Sustainable ... heat conduction (7) , while the active parts will be modeled according to the constant parameters theory (Buist, 1995). ()()(),,,,,, ,,,TxyztTxyzt wxyzt Ctϑ∂λ∂∇+ = (7) Fig....