Discover The Power Within
The draw back to the TEG POWER technology is also it’s strength. Because the power densities are very large, small units can be manufactured. For example a 300 watt TEG assembly can fit in an about a twentieth of the space required for an equivalent solar array. As well, the output is 24 hours per day as long as there is a heat source and a cold removal side. So, actual power output could be 6 -7 times what a 300 watt solar array could produce. What is needed to make the technology cheap to operate is waste heat, which by the definition is free. The key words being “WASTE HEAT”. To extract the most efficiency and thermoelectric power from the present state of the art semiconductor materials. It is advisable to have a temperature of 150 to 250°C (302-482°F) hot side, with a Delta Temperature (DT) of at least 100°C. Some applications can work on low grade heat in the 100°C (212°F) range, if the volume of waste heat is high and ample cold side water or air is available.
Hybrid Thermoelectric Module
Presently, Bi2Te3 is the most efficient at room temperature. Material such as PbTe, and CMO’s have also been used in temperatures of 350 to 600° C (702-1112°F). Both Bi2Te3 and PbTe are mature material.Their characteristics and performance are well documented and have been used extensively in commercial application. PbTe however, is almost impossible to purchase commercially by itself in module form until now. Starting June 1st, 2014 PbTe will be offered as a Hybrid Thermoelectric module combining the best in class BiTe P-type with the best in Class PbTe N-Type material to form the first Hybrid TEG modules classed as a TEG1-PB series module. PbTe properties are better suited to temperatures above 300°C so the combination works well in the 300°C to 360°C range. We also carry CMO’s which work at very high temperatures 500°C to 800°C and come in both single module construction and also Cascaded (stacked) with Bi2Te3 on the cold side to take advantage of lower temperatures ranges after the higher heat has passed through the CMO material. These Cascades result in an overall efficiency of ~6 to 7 %.