1. POWER SYSTEMS CONFERENCE POWER SYSTEMS CONFERENCE LTspice Model of a Solar Thermoelectric Generation System Presented by: Yacouba Moumouni Co-author: R. Jacob Baker

2. POWER SYSTEMS CONFERENCE POWER SYSTEMS CONFERENCE Outline ABSTRACT INTRODUCTION T HERMOELECTRIC G ENERATOR B ASIC P RINCIPLES S OLAR TEG S YSTEM M ODELING IN LT SPICE A N RC A NALOGY OF A TEG R ESULTS AND A NALYSIS C ONCLUSION Q UESTIONS AND A NSWERS R EFERENCES

3. POWER SYSTEMS CONFERENCE 1. ABSTRACT Analytical heat transfer analysis is cumbersome An LTspice model of a real-world STEG is proposed Thermal parameters were extracted from device geometries and properties Parameters were converted thru’ “thermal-to- electrical analogy” An RC analogy was derived from this model Temp variations on the cold side were 80% accurate

4. POWER SYSTEMS CONFERENCE 2. INTRODUCTION Energy is vital in the 21 st Century Fossil fuels (FF) based energy are 80-85% Energy from FF is less expensive to produce Solar energy is most abundant and cleanest Solar energy has two major disadvantages There is a great need for energy storage Few of TEG modeling considered the effects of internal parameters ( Seebeck coef, Parasitic L and C, and Internal R )

5. POWER SYSTEMS CONFERENCE 3. TEG B ASIC P RINCIPLES

6. POWER SYSTEMS CONFERENCE 4. STEG S YSTEM M ODELING IN LT SPICE Setup of the STEG System Parameters Extraction Electrical Analogy of Thermal System TEG Implementation in LTspice ( convenience in viewing and interpreting the interactions b/w ) 1) Seebeck; 2) Joule; 3) Peltier; and 4) Thomson. DesignationsThermal resistance (K/W) Thermal capacitance (J/K) TEG 0.64 23 Main heat sink 0.075 2694 Lateral sink 0.112 970 Insulation foam 109 91

7. POWER SYSTEMS CONFERENCE 5. Proposed thermal model of the System

8. POWER SYSTEMS CONFERENCE 6. A N RC A NALOGY OF A TEG Direct Normal Irradiance (DNI) An impulse of light organized in a lookup Built-in LTspice piece wise linear command Internal parasitic (C) and Internal (R) were used The input wave transitions from 0C to 100 C (T pulse )

9. POWER SYSTEMS CONFERENCE 7. R ESULTS AND A NALYSIS Temperature variations across the STEG system: a) Experiment, b) Sim

10. POWER SYSTEMS CONFERENCE 8. C ONCLUSION Electrical analogy of thermal system to simulate STEG is presented A novel RC analogy to estimate the cold side temp is also presented The study reveals the challenges to accurately model the exact behavior of all the physical parts that constitute a real-envt STEG Experimental and simulated results remain in good agreement STEG with Battery be used for all kinds of remote energy applications. Thank you,

11. POWER SYSTEMS CONFERENCE 9. R EFERENCES