다이아몬드 나노분말을 적용한 상용 열교환 유체의 열전도도 특성
Thermal conductivity characteristics of commercial heat exchange fluids applying diamond nano-powder
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초록
기본유체에 나노분말을 분산시킨 나노유체는 기본유체보다 높은 열전도도를 보인다. 이러한 특성으로 인해, 에너지 효율을 향상시키기 위한 대안으로서 나노유체가 주목받고 있으며, 고효율을 필요로하는 열교환기의 작동유체로 적용하기 위한 많은 연구가 진행되고 있다. 본 연구에서는 상용 열교환기의 작동유체로서 많이 사용되고 있는 증류수, 에틸렌글리콜, 에틸알코올에 나노다이아몬드 분말을 적용한 나노유체의 열전도도를 측정하였다. 나노유체는 매트릭스 합성 분산법을 이용하여 제조하였으며, 나노다이아몬드의 혼합량은 0.1, 0.3, 0.5, 1vol%로 하였다. 측정결과 모든 기본유체 조건에서 나노유체의열전도도가 증가하였으며, 특히 증류수에 분산된 1vol%의 나노유체에서 23%의 높은 열전도도 향상 경향을 보였다.
Abstract
Nanofluids, suspending nano-particles of various materials, have a good heat transfer characteristicscompared with pure base fluids. For the reason, nanofluids have been considered as one of the measure toimprove energy efficiency, and studied to apply on a working fluid of a high performance heat exchanger. This study tested thermal conductivities of nanofluids applying diamond nano-powder on DI water, ethyleneglycol, and ethyl alcohol. Nanofluids are fabricated by matrix synthetic method, and the volume percent of diamondnano-powder contained in the base fluid are 0.1, 0.3, 0.5, and 1vol%. As a result, thermal conductivitiesare enhanced with applying diamond nano-power. Especially, the conductivity is highly increased upto 23% at 1vol% nanofluid applying diamond nano-powder on DI water.
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