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유나영(Na Young You),이민정(Min Jung Lee),신명재(Myeong Jae Shin),조홍현(Hong Hyun Cho) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6
In this study, the photothermal conversion characteristics of CNT, Fe₃O₄, and SiC nanofluids were ezperimetally investigated to select a heat transfer fluid for the direct absorption solar collecting method. The concentrations of CNT, Fe₃O₄, and SiC nanofluids used for the experiment were 0.002wt%, 0.075wt%, and 0.02wt%, ant which the optical absorption reached the critical point. The maximum absorption efficiency of 0.002wt% CNT, 0.075wt% Fe₃O₄ and 0.02wt% SiC nanofluids were measured to be 80.8%, 77.8%, and 72.3%. In addition, the photothermal conversion efficiency of 0.002wt% CNT, 0.075wt% Fe₃O₄, and 0.02wt% SiC nanofluids were measured to be 90.03%, 84.38%, and 93.26%. From these results, it is judged that the CNT nanofluid is economically advantageous compared to Fe₃O₄ and SiC nanofluids to improve photothermal conversion characteristics. However, when using CNT nanofluids for the direct absorption solar collection method, the long-term high-temperature dispersion stability is low and using the low concentration of CNT nanofluid is disadvantageous. Therefore, there is a need for future research to select a suitable nanofluid for the direct absorption solar collecting method by evaluating the light-to-heat conversion characteristics, economic feasibility, and dispersion stability.
유나영(Na Young You),이민정(Min Jung Lee),신명재(Myeong Jae Shin),조홍현(Hong Hyun Cho) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6
In this study, the photothermal conversion characteristics of CNT, Fe₃O₄, and SiC nanofluids were ezperimetally investigated to select a heat transfer fluid for the direct absorption solar collecting method. The concentrations of CNT, Fe₃O₄, and SiC nanofluids used for the experiment were 0.002wt%, 0.075wt%, and 0.02wt%, ant which the optical absorption reached the critical point. The maximum absorption efficiency of 0.002wt% CNT, 0.075wt% Fe₃O₄ and 0.02wt% SiC nanofluids were measured to be 80.8%, 77.8%, and 72.3%. In addition, the photothermal conversion efficiency of 0.002wt% CNT, 0.075wt% Fe₃O₄, and 0.02wt% SiC nanofluids were measured to be 90.03%, 84.38%, and 93.26%. From these results, it is judged that the CNT nanofluid is economically advantageous compared to Fe₃O₄ and SiC nanofluids to improve photothermal conversion characteristics. However, when using CNT nanofluids for the direct absorption solar collection method, the long-term high-temperature dispersion stability is low and using the low concentration of CNT nanofluid is disadvantageous. Therefore, there is a need for future research to select a suitable nanofluid for the direct absorption solar collecting method by evaluating the light-to-heat conversion characteristics, economic feasibility, and dispersion stability.