Preparation of perlite based‑zinc nitrate hexahydrate composite for electric radiant floor heating in model building and numerical analysis
Zinc nitrate hexahydrate, an inorganic phase change material, can store high latent heat during its phase change, but it has significant phase transition defects, including form instability, a high degree of supercooling, and phase separation issues. Zinc nitrate hexahydrate/expanded perlite (EP) co...
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
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2022
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| Online Access: | https://hdl.handle.net/10356/161882 |
| _version_ | 1826115022774861824 |
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| author | Dixit, Prakhar Reddy, Vennapusa Jagadeeswara Dasari, Aravind Chattopadhyay, Sujay |
| author2 | School of Materials Science and Engineering |
| author_facet | School of Materials Science and Engineering Dixit, Prakhar Reddy, Vennapusa Jagadeeswara Dasari, Aravind Chattopadhyay, Sujay |
| author_sort | Dixit, Prakhar |
| collection | NTU |
| description | Zinc nitrate hexahydrate, an inorganic phase change material, can store high latent heat during its phase change, but it has significant phase transition defects, including form instability, a high degree of supercooling, and phase separation issues. Zinc nitrate hexahydrate/expanded perlite (EP) composite was fabricated by impregnating zinc nitrate hexahydrate into expanded perlite and further 65 wt% PCM-EP composite was coated with paraffin to reduce phase transition imperfections. Scanning electron microscope (SEM) results confirmed that the zinc nitrate hexahydrate could be impregnated into expanded perlite, and paraffin successfully formed a coating layer on the expanded perlite surface. Fourier transform infrared spectroscopy (ATR-IR) confirmed no chemical interactions between zinc nitrate hexahydrate and expanded perlite. The melting and crystallization enthalpies of paraffin-coated PCM composites are 82.24 ± 2.93 kJ kg−1 and 73.32 ± 1.97 kJ kg−1 respectively. The supercooling was reduced from 7 °C to 1 °C owing to numerous nucleation sites on the surface of expanded perlite and coating effect of the paraffin. After the 500 thermal cycles, melting and crystallization enthalpy of coated composite PCM is 78.24 kJ kg−1 and 68.32 kJ kg−1 respectively. Electric radiant floor heating application studies of the coated composite phase change material were performed by varying heat transfer area of building model and amount of composite used. COMSOL Multiphysics 5.6 was used to simulate the thermal buffering performance of the composite in floor heating application. The temperature profile predicted by the simulation was found to be quite close to the experimental data. |
| first_indexed | 2024-10-01T03:48:44Z |
| format | Journal Article |
| id | ntu-10356/161882 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T03:48:44Z |
| publishDate | 2022 |
| record_format | dspace |
| spelling | ntu-10356/1618822022-09-23T01:35:16Z Preparation of perlite based‑zinc nitrate hexahydrate composite for electric radiant floor heating in model building and numerical analysis Dixit, Prakhar Reddy, Vennapusa Jagadeeswara Dasari, Aravind Chattopadhyay, Sujay School of Materials Science and Engineering Engineering::Materials Shape Stabilized Composite Expanded Perlite Zinc nitrate hexahydrate, an inorganic phase change material, can store high latent heat during its phase change, but it has significant phase transition defects, including form instability, a high degree of supercooling, and phase separation issues. Zinc nitrate hexahydrate/expanded perlite (EP) composite was fabricated by impregnating zinc nitrate hexahydrate into expanded perlite and further 65 wt% PCM-EP composite was coated with paraffin to reduce phase transition imperfections. Scanning electron microscope (SEM) results confirmed that the zinc nitrate hexahydrate could be impregnated into expanded perlite, and paraffin successfully formed a coating layer on the expanded perlite surface. Fourier transform infrared spectroscopy (ATR-IR) confirmed no chemical interactions between zinc nitrate hexahydrate and expanded perlite. The melting and crystallization enthalpies of paraffin-coated PCM composites are 82.24 ± 2.93 kJ kg−1 and 73.32 ± 1.97 kJ kg−1 respectively. The supercooling was reduced from 7 °C to 1 °C owing to numerous nucleation sites on the surface of expanded perlite and coating effect of the paraffin. After the 500 thermal cycles, melting and crystallization enthalpy of coated composite PCM is 78.24 kJ kg−1 and 68.32 kJ kg−1 respectively. Electric radiant floor heating application studies of the coated composite phase change material were performed by varying heat transfer area of building model and amount of composite used. COMSOL Multiphysics 5.6 was used to simulate the thermal buffering performance of the composite in floor heating application. The temperature profile predicted by the simulation was found to be quite close to the experimental data. Financial support to execute the experimental work is gratefully acknowledged to MHRD (Ministry of Human Resources Development) Plan grant (2019-20) and IIT Roorkee (No. OH-35-71-142), IIT Roorkee, India. 2022-09-23T01:35:15Z 2022-09-23T01:35:15Z 2022 Journal Article Dixit, P., Reddy, V. J., Dasari, A. & Chattopadhyay, S. (2022). Preparation of perlite based‑zinc nitrate hexahydrate composite for electric radiant floor heating in model building and numerical analysis. Journal of Energy Storage, 52, 104804-. https://dx.doi.org/10.1016/j.est.2022.104804 2352-152X https://hdl.handle.net/10356/161882 10.1016/j.est.2022.104804 2-s2.0-85129995679 52 104804 en Journal of Energy Storage © 2022 Elsevier Ltd. All rights reserved. |
| spellingShingle | Engineering::Materials Shape Stabilized Composite Expanded Perlite Dixit, Prakhar Reddy, Vennapusa Jagadeeswara Dasari, Aravind Chattopadhyay, Sujay Preparation of perlite based‑zinc nitrate hexahydrate composite for electric radiant floor heating in model building and numerical analysis |
| title | Preparation of perlite based‑zinc nitrate hexahydrate composite for electric radiant floor heating in model building and numerical analysis |
| title_full | Preparation of perlite based‑zinc nitrate hexahydrate composite for electric radiant floor heating in model building and numerical analysis |
| title_fullStr | Preparation of perlite based‑zinc nitrate hexahydrate composite for electric radiant floor heating in model building and numerical analysis |
| title_full_unstemmed | Preparation of perlite based‑zinc nitrate hexahydrate composite for electric radiant floor heating in model building and numerical analysis |
| title_short | Preparation of perlite based‑zinc nitrate hexahydrate composite for electric radiant floor heating in model building and numerical analysis |
| title_sort | preparation of perlite based zinc nitrate hexahydrate composite for electric radiant floor heating in model building and numerical analysis |
| topic | Engineering::Materials Shape Stabilized Composite Expanded Perlite |
| url | https://hdl.handle.net/10356/161882 |
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