Thermochemical heat storage is a promising technology for improving energy efficiency through the utilization of low-grade waste heat. The formation of a SrCl<sub>2</sub> ammine complex was selected as the...Thermochemical heat storage is a promising technology for improving energy efficiency through the utilization of low-grade waste heat. The formation of a SrCl<sub>2</sub> ammine complex was selected as the reaction system for the purpose of this study. Discharge characteristics were evaluated in a packed bed reactor for both the gas-solid reaction and the liquid-solid reaction. The average power of the gas-solid reaction was influenced by the pressure of the supplied ammonia gas, with greater powers being recorded at higher ammonia pressure. For the liquid-solid reaction, the obtained average power was comparable to that obtained for the gas-solid reaction at 0.2 MPa. Moreover, the lower heat transfer resistance in the reactor was observed, which was likely caused by the presence of liquid ammonia in the system. Finally, the short-term durability of the liquid-solid reaction system was demonstrated over 10 stable charge/discharge cycles.展开更多
Thermochemical heat storage(THS)systems have recently attracted a lot of attention in research and development.In this study,an anodic aluminum oxide(AAO)template,fabricated by a two-step anodization method,was used f...Thermochemical heat storage(THS)systems have recently attracted a lot of attention in research and development.In this study,an anodic aluminum oxide(AAO)template,fabricated by a two-step anodization method,was used for the first time as the matrix material for a THS system.Different salts were studied as thermochemical materials for their suitability in low-grade heat storage application driven by solar energy for an open system.Compositions were prepared by absorbing CaCl2,MgCl2,LiCl,LiNO3 and mixtures of these salts under a vacuum in an AAO matrix.Field Emission Scanning Electron Microscopy was used to examine the morphology of the produced AAO composites.Thermal energy storage capacities of the composites were characterized using a differential scanning calorimeter.Characterization analysis showed that anodized Al plates were suitable matrix materials for THS systems,and composite sorbent prepared with a 1:1 ratio LiCl/LiNO3 salt mixture had the highest energy value among all composites,with an energy density of 468.1 k J·kg-1.展开更多
文摘Thermochemical heat storage is a promising technology for improving energy efficiency through the utilization of low-grade waste heat. The formation of a SrCl<sub>2</sub> ammine complex was selected as the reaction system for the purpose of this study. Discharge characteristics were evaluated in a packed bed reactor for both the gas-solid reaction and the liquid-solid reaction. The average power of the gas-solid reaction was influenced by the pressure of the supplied ammonia gas, with greater powers being recorded at higher ammonia pressure. For the liquid-solid reaction, the obtained average power was comparable to that obtained for the gas-solid reaction at 0.2 MPa. Moreover, the lower heat transfer resistance in the reactor was observed, which was likely caused by the presence of liquid ammonia in the system. Finally, the short-term durability of the liquid-solid reaction system was demonstrated over 10 stable charge/discharge cycles.
基金supported by the Scientific and Technological Research Council of Turkey (TUBITAK) (Project No. 315M524)the Scientific Research Projects Coordination Unit of Istanbul University (Project No. 25427)
文摘Thermochemical heat storage(THS)systems have recently attracted a lot of attention in research and development.In this study,an anodic aluminum oxide(AAO)template,fabricated by a two-step anodization method,was used for the first time as the matrix material for a THS system.Different salts were studied as thermochemical materials for their suitability in low-grade heat storage application driven by solar energy for an open system.Compositions were prepared by absorbing CaCl2,MgCl2,LiCl,LiNO3 and mixtures of these salts under a vacuum in an AAO matrix.Field Emission Scanning Electron Microscopy was used to examine the morphology of the produced AAO composites.Thermal energy storage capacities of the composites were characterized using a differential scanning calorimeter.Characterization analysis showed that anodized Al plates were suitable matrix materials for THS systems,and composite sorbent prepared with a 1:1 ratio LiCl/LiNO3 salt mixture had the highest energy value among all composites,with an energy density of 468.1 k J·kg-1.
