June 20, 2010
June 20, 2010
June 23, 2010
Electrical and Computer
15.1048.1 - 15.1048.14
The thermal diffusion of holes (positive carriers) creates the electric current directed down in Fig. 3-right. But the diffusion of electrons creates the electric current directed up in Fig. 3-left since the current direction is opposite to the direction of electron motion. Hence, the net current forms a closed loop through the thermoelectric engine as shown in Fig. 3. A load may be inserted in that current loop anywhere along the lower metal plate. To do so, we must break this plate, indeed. Thermoelectric engines currently are going down in price; they might perhaps become competitors to the solar cells in certain applications. Even though this subject may not be covered in a separate lecture, it is a viable subtopic of an inexpensive ($15 per bench) laboratory subproject.
Fig. 3. Concept of the thermoelectric engine or an inverse Peltier device. Electric current due to thermal diffusion of opposite charge carriers forms a closed loop.
The sketch of the corresponding laboratory project (solar cell + Peltier device) is given below: Introduction Part I Equivalent circuit of the solar cell 1. A very primitive photovoltaic source (a LED) 2. Equivalent circuit of the solar cell (measure LEDs in series/parallel with the DMM) Part II Single solar cell versus solar panel 1. Measuring solar cell geometry parameters - a 1-3W c-Si solar panel (~$25 per bench) 2. Solar cell performance at the laboratory bench a. Preparation of solar panel contacts b. Measuring open-circuit voltage and short-circuit current c. How much power do we really have? d. Using an electric energy storage element (capacitor) with the solar cell Part III Solar panel and its efficiency (using an artificial light source) 1. Load matching (maximum power output) 2. Motor load 3. Efficiency of your module and to date efficiency of a c-Si solar module Part IV Thermoelectric engine 1. Concept 2. Use 3. Effect of a higher temperature gradient
5. Laboratory materials
Class laboratory should be simple and practical. Under practical we imply that a laboratory project should have a clear, immediate relevance, at least by the end of the laboratory period.
Makarov, S., & Ludwig, R., & Bitar, S. (2010, June), Role And Place Of Interactive Learning Materials In An Undergraduate Introductory Ece Class For Non Majors Paper presented at 2010 Annual Conference & Exposition, Louisville, Kentucky. 10.18260/1-2--15796
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