Fig. 4: Cooling and power-generation performances of Mg3Bi2-xSbx/Bi0.5Sb1.5Te3 (x = 0.5, 0.75) based TE modules.
From: Improved figure of merit (z) at low temperatures for superior thermoelectric cooling in Mg3(Bi,Sb)2
a The comparison of maximum cooling temperature differences between Mg3Bi2-xSbx/Bi0.5Sb1.5Te3 (x = 0.5, 0.75) TE modules and commercial Bi2Te3-based module with a variety of hot-side temperatures Th. b The cooling power density (qc) as a function of current for CGBi1.5/Bi0.5Sb1.5Te3 based modules, in comparison to the 7-pair SPS Mg3Bi1.5Sb0.5/Bi0.5Sb1.5Te3 cooling module with the normalized cross-section. c COP for CGBi1.5/Bi0.5Sb1.5Te3-based modules at temperature differences of 0 K, 5 K, and 10 K, respectively. All the dashed dot lines represent the theoretical prediction and the open circles indicate experimental data in b, c. d The distribution of industrial waste heat, where the waste heat at T < 473 K (mostly cooling medium and waste water and steam) takes up ~31%56. e The measured conversion efficiencies as a function of temperature difference for the Mg3Bi2-xSbx/Bi0.5Sb1.5Te3 (x = 0.5, 0.75) TE modules compared to that of commercial Bi2Te3 and results from literatures based on Bi2Te342,43,44, SnSe37 and Mg3(Bi,Sb)2 materials35, 36, 45,46,47. f Aging time dependent maximum cooling temperature differences of CGBi1.5/Bi0.5Sb1.5Te3 devices and electrical resistivity of CGBi1.5 samples.
