TY - JOUR ID - 155110 TI - Investigation of the enhancement of thermophysical properties of new combinations of MWCNTs with several PCMs consisting of a type of paraffin in comparison with some mineral compounds (AN-MN-6H2O) JO - Journal of Renewable Energy and Environment JA - JREE LA - en SN - 2423-5547 AU - Bathaei, Seyed Amir Hassan AU - Iranmanesh, Masoud AU - Amiri, Hossein AU - Kourki, Hajir AD - Department of Energy, Institute of Science and High Technology and Environmental Sciences, Graduate University of Advanced Technology, Kerman, Iran. AD - Chemical Engineering Department, Polymer Engineering Group Institute of Science and High Technology and Environmental Sciences, Graduate University of Advanced Technology, Kerman, Iran. Y1 - 2023 PY - 2023 VL - 10 IS - 2 SP - 45 EP - 55 KW - Solar thermal energy storage KW - phase change materials KW - Paraffin KW - MWCNTs KW - Thermo-Physical Properties DO - 10.30501/jree.2022.339549.1363 N2 - Thermal Energy Storage (TES) for solar thermal systems has attracted great attention because of the intermittent availability of solar energy. In the current paper, new combinations of several Phase Change Materials (PCMs) including a type of paraffin and some mineral compounds like ammonium nitrate and magnesium nitrate hexahydrate were exanimated and their thermo-physical properties were compared. This study targets solar heating systems at different temperature intervals for the TES. Another new approach of this study is to determine the effect of Multi-Wall Carbon Nanotubes (MWCNTs) with two diameters (D) of 8 and 10-20 nm on paraffin's thermophysical property to improve these properties. An innovative method was used to measure Electrical Conductivity (EC) as it is easier to measure than thermal conductivity (K) to study the effect of nanoparticles on PCM behavior. The results showed that the highest values of improvement over paraffin properties were related to 5% nanoparticle additive for both nanoparticle diameters among the percentages studied. The addition of 5 % nanoparticles with 10-20 nm and 8 nm to paraffin at 25 ° C increased heat conductivity by 142% and 156%, respectively. The addition of nanoparticles to paraffin improved EC several times such that a diameter of 8 nm made a 300% increase in EC compared to 10-20 nm.  UR - https://www.jree.ir/article_155110.html L1 - https://www.jree.ir/article_155110_52a3a712d7b2f238399571b1c57f4476.pdf ER -