Experimental study on thermal behavior of new mixed medium phase change material for improving productivity on salt gradient solar pond
| Autor: | Mohammad Hossein Tahan, Mohammad Reza Assari, Hassan Basirat Tabrizi, Alireza Jafar Gholi Beik |
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| Rok vydání: | 2020 |
| Předmět: |
Convection
Materials science fungi Extraction (chemistry) Environmental engineering 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Phase-change material Energy storage 010406 physical chemistry 0104 chemical sciences Solar pond Salinity parasitic diseases Thermal Physical and Theoretical Chemistry 0210 nano-technology Internal heating |
| Zdroj: | Journal of Thermal Analysis and Calorimetry. 147:971-985 |
| ISSN: | 1588-2926 1388-6150 |
| DOI: | 10.1007/s10973-020-10317-6 |
| Popis: | Five identical cylindrical salinity-gradient solar ponds (SGSPs) with internal heat exchanger were constructed and operated. In order to optimize the performance of the SGSPs, mixtures of NaCl and Na2SO4 were used. Radiation flux, temperature of the zones, ambient temperature, inlet, and outlet temperature of the internal heat exchangers were measured. It was shown a controlled amount of Na2SO4 improves the thermal and salinity stability of the pond in the normal operation and heat extraction and lowers the pond temperature drop ratio to the water outlet temperature drop during the heat extraction, which means an improvement in the energy storage capacity. The pond with higher percentage of Na2SO4 requires less time to stabilize. Higher percentage Na2SO4 reduces the density gradient between the upper and lower convective zones of the pond and leads to rapid destruction of the upper layer. Maximum ability of heat extraction corresponds to the pond with 0.75% Na2SO4. In addition, to prevent the algae growth at higher percentage Na2SO4, spraying of HCl on the pond surface was used. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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