In order to measure the thermophysical properties of ammoniated salt (CaCl2.mNH3: m = 4, 8) as an energy storage system utilizing natural resources, the measurement unit was developed, and the thermophysical propertie...In order to measure the thermophysical properties of ammoniated salt (CaCl2.mNH3: m = 4, 8) as an energy storage system utilizing natural resources, the measurement unit was developed, and the thermophysical properties (effective thermal conductivity and thermal diffusivity) of CaCl2.mNH3 and CaCl2.mNH3 with heat transfer media (Ti: titanium) were measured by the any heating method. The effective thermal conductivities of CaCl2.4NH3 + Ti and CaCl2.8NH3 + Ti were 0.14 - 0.17 and 0.18 - 0.20 W/(m.K) in the measuring temperature range of 290 - 350 K, respectively, and these values were approximately 1.5 - 2.2 times larger than those of CaCl2.4NH3 and CaCl2.8NH3. The effective thermal diffusivities were 0.22 - 0.24 × 10-6 and 0.18 - 0.19 × 10-6 m2/sin the measuring temperature range of 290 - 350 K, respectively, and these values were approximately 1.3 - 1.5 times larger than those of CaCl2.4NH3 and CaCl2.8NH3. The obtained results show that the thermophysical properties have a dependence on the bulk densities and specific heats of CaCl2.mNH3 and CaCl2.mNH3 + Ti. It reveals that the thermophysical properties in this measurement would be the valuable design factors to develop energy and H2 storage systems utilizing natural resources such as solar energy.展开更多
The effects of heat treatment（at 1473 K for 2 h or 6 h） on the hydriding/dehydriding characteristics of Ti18Cr24V55Zr3 alloy were investigated.The microstructure analysis showed that the as-cast alloy consisted of a...The effects of heat treatment（at 1473 K for 2 h or 6 h） on the hydriding/dehydriding characteristics of Ti18Cr24V55Zr3 alloy were investigated.The microstructure analysis showed that the as-cast alloy consisted of a V-based solid solution main phase with BCC structure and a ZrCr2 secondary phase,and the alloys treated at 1473 K for 2 h and 6 h had a small amount of Ti-rich phase besides the V-based solid solution and ZrCr2 phase.It was found that the heat treatment led to an increase of the kinetics of the alloy and a slight decrease of the hydrogen absorption capacity at 20℃.However,the heat treatment increased the width and decreased the gradient of the plateau of the p-c isotherm.The result showed that the alloy treated at 1473 K for 2 h had good overall properties,such as activation behavior of 1 cycle,hydrogen absorption capacity of 394 ml·g-1 at 20℃ and effective desorption capacity of 232 ml·g-1 at 80℃.展开更多
文摘In order to measure the thermophysical properties of ammoniated salt (CaCl2.mNH3: m = 4, 8) as an energy storage system utilizing natural resources, the measurement unit was developed, and the thermophysical properties (effective thermal conductivity and thermal diffusivity) of CaCl2.mNH3 and CaCl2.mNH3 with heat transfer media (Ti: titanium) were measured by the any heating method. The effective thermal conductivities of CaCl2.4NH3 + Ti and CaCl2.8NH3 + Ti were 0.14 - 0.17 and 0.18 - 0.20 W/(m.K) in the measuring temperature range of 290 - 350 K, respectively, and these values were approximately 1.5 - 2.2 times larger than those of CaCl2.4NH3 and CaCl2.8NH3. The effective thermal diffusivities were 0.22 - 0.24 × 10-6 and 0.18 - 0.19 × 10-6 m2/sin the measuring temperature range of 290 - 350 K, respectively, and these values were approximately 1.3 - 1.5 times larger than those of CaCl2.4NH3 and CaCl2.8NH3. The obtained results show that the thermophysical properties have a dependence on the bulk densities and specific heats of CaCl2.mNH3 and CaCl2.mNH3 + Ti. It reveals that the thermophysical properties in this measurement would be the valuable design factors to develop energy and H2 storage systems utilizing natural resources such as solar energy.
文摘The effects of heat treatment（at 1473 K for 2 h or 6 h） on the hydriding/dehydriding characteristics of Ti18Cr24V55Zr3 alloy were investigated.The microstructure analysis showed that the as-cast alloy consisted of a V-based solid solution main phase with BCC structure and a ZrCr2 secondary phase,and the alloys treated at 1473 K for 2 h and 6 h had a small amount of Ti-rich phase besides the V-based solid solution and ZrCr2 phase.It was found that the heat treatment led to an increase of the kinetics of the alloy and a slight decrease of the hydrogen absorption capacity at 20℃.However,the heat treatment increased the width and decreased the gradient of the plateau of the p-c isotherm.The result showed that the alloy treated at 1473 K for 2 h had good overall properties,such as activation behavior of 1 cycle,hydrogen absorption capacity of 394 ml·g-1 at 20℃ and effective desorption capacity of 232 ml·g-1 at 80℃.
