A thermoelectric energy harvesting system may include a thermoelectric generator and an electronics module. The apparatus of the invention includes a transmitter, a receiver coupled to the transmitter and a test control system coupled to the transmitter and receiver for measuring a data error rate of the data communications system. Two elongated extension bars, e. The method also includes calculating Scores from the mean-scaled values for the collected data using at most first, second, third and fourth Principal Components derived from a model using archived data sets and saving the Scores and the mean values. The heat is then re-radiated in an unfocused fashion with only a small portion of it redirected to the seal area.