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Received March 27, 2018
Accepted June 4, 2018
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수분이 NaKZn-Chloride의 녹는점과 고온안정성에 미치는 영향
Effect of Moisture on the Melting Point and High-Temperature Stability of NaKZn-Chloride
1과학기술연합대학원대학교 플랜트기계공학과, 34113 대전광역시 유성구 가정로 217 2한국기계연구원 열시스템연구실, 34103 대전광역시 유성구 가정북로 156
1Department of Plant System and Machinery, University of science and Technology, 217, Gajeong-ro, Yuseong-gu, Daejeon, 34113, Korea 2Department of Thermal Systems, Korea Institute of Machinery and Materials, 156, Gajeongbuk-ro, Yuseong-gu, Daejeon, 34103, Korea
Korean Chemical Engineering Research, August 2018, 56(4), 555-560(6), 10.9713/kcer.2018.56.4.555 Epub 3 August 2018
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Abstract
NaCl-KCl-ZnCl2 혼합물(NaKZn-Chloride)의 열물성을 조사하여 열저장 매체로서의 잠재성을 평가하였다. 고온용 축열물질로 이용하기 위해서는 축열온도 범위에서 안정된 열물성을 유지하여야 하는데, 사전실험 결과 해당 혼합물은 알려진 고온안정온도인 850 °C 보다 훨씬 낮은 온도에서 급격한 분해가 진행되었다. 이에 본 연구에서는, 흡수된 수분에 의해 축열물질의 열적 성질이 변화되는지 확인하고자 하였다. 혼합물의 수분함량에 따라 열물성이 변화되는 지를 열물성 장비로 측정하였으며, 가열-냉각 반복실험을 통해 다시 한 번 확인하였다. 그 결과 녹는 점의 경우 흡수된 수분에 관계없이 일정하지만, 고온 안정성의 경우 흡습한 샘플에서 다소 낮아지는 것을 알 수 있었다. 본 연구결과에 따라 흡습성을 가지는 고온 축열물질을 사용하는 시스템에서 수분과의 접촉을 줄임으로써 축열물질의 손실을 줄일 수 있다.
The high temperature stability of a chloride mixture, NaCl-KCl-ZnCl2 (NaKZn-Chloride), is investigated to evaluate its potential as a thermal storage material. A thermal storage media should maintain a stable thermal properties within the temperature range of heat storage. Results from an a priori experiment showed that the NaKZn-chloride is stable only up the much lower temperature, while its stability limit is reported to be 850 oC in the literature. This study aims to investigate if the thermal property is changed by the moisture absorbed in the heat storage material. The effect of moisture content on the thermal properties was measured. The results show that the melting point remains the same regardless of the amount of moisture absorbed. Meanwhile, the high temperature stability is lower for the moisture treated samples. The results of this work infer that the loss of a hygroscopic thermal storage media can be reduced by avoiding its contacts to moisture in designing high temperature thermal storage systems.
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