Abstract
The thermo-emf ΔV and thermoelectric current ΔI generated by imposing a temperature gradient alternating at a period of T on a thermoelectric (TE) generator were measured as a function of t, where t is the lapsed time and 1/T was varied from 0 to 1/30 s-1. A TE generator was sandwiched between two Peltier modules connected in series. The alternating temperature gradients were produced by imposing an alternating voltage V on two Peltier modules, where V was varied from 1.0 to 3.7 V. Both ΔV and ΔI generated by the TE generator oscillate at a period of T but their amplitudes tend to increase monotonically with an increase of V. The effective thermo-emf ΔVeff and current ΔIeff calculated from ΔV and ΔI increase abruptly with an increase of 1/T and have a local maximum at 1/T=1/120 or 1/240 s-1. The generating power ΔWeff(=ΔVeffΔIeff) tends to increase proportionally with an increase of input power Winput, owing to the increase in the temperature difference. The rate of ΔWeff to Winput at 1/T=1/240 s-1 reached approximately 3.2 times as large as that obtained for the steady temperature gradient corresponding to 1/T=0 s-1. It was thus found that the generating power of the TE generator operating under the temperature gradient alternating at an optimum period is remarkably increased compared to that of a TE generator working under a conventional steady temperature gradient.
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72.15.Jf; 84.60.Rb; 85.30De
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Yamashita, O., Odahara, H. Generating power of a thermoelectric generator under periodically alternating temperature gradients. Appl. Phys. A 85, 45–51 (2006). https://doi.org/10.1007/s00339-006-3650-9
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DOI: https://doi.org/10.1007/s00339-006-3650-9