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Key Words: AMTEC(금속유체열변환기), Capillary Wick(모세관윅), Porosity(기공률), Pressure Drop(압력손실), Evaporator Wick(증발부윅), Artery Wick(순환윅), Particle Size(입자크기)초록: AMTEC기술은열을직접전기로변환시키는기술로서소디움을작동유체로사용하고있으며, 작동유체의순환은모세관윅을사용한다. 순환계통에는증발부윅, 순환윅및응축부윅으로구성되고, 각각의윅은소디움의액체또는증기가순환하면서압력손실이발생하므로소디움의순환을위해서는증발부윅의모세관압력이윅내의총압력손실보다커야만한다. 본연구에서는100 watt급의AMTEC시제품설계을위해소디움의순환계통으로구성되는증발부윅, 순환윅및응축부윅에서의압력손실과증발부에서응축부로의열손실을순환윅의직경과길이에대해분석하여증발부윅의소결입자직경과순환윅의설계에활용하코저하였으며, 분석결과에서순환계통의총압력손실보다큰모세관압력을위해서는증발부윅의소결입자크기는10 μm이적합한결과를얻었다.Abstract: An AMTEC (alkali metal thermal electric converter) is a device that is used for the directconversion of heat to electricity. Sodium is used as the working fluid, and its circulation is driven by acapillary wick. The wicks used for circulation include an evaporator wick, artery wick, and condenser wick,and each wick has a pressure drop because of the circulation of liquid and vapor. For the circulation ofsodium, the capillary pressure of the evaporator wick must be greater than the total pressure drop in thewicks. In this study, the pressure drop in the evaporator wick, artery wick, and condenser wick and the heatloss from the evaporator to the condenser through the artery wick were analyzed for the design of a 100 WAMTEC prototype. It was found that a particle diameter of 10 μm is suitable for the evaporator wick tomaintain a capillary pressure greater than total pressure drop in the circulation loop. |
