为响应“双碳”战略目标,阶梯式碳交易、绿证交易与需求响应的交互联动具有重要意义,其交互可减少园区的碳排放以及降低园区的运行成本。首先,构建绿证-阶梯式碳交易的数学计算模型;其次,引入需求响应机制,引导用户用电行为,促进新能源...为响应“双碳”战略目标,阶梯式碳交易、绿证交易与需求响应的交互联动具有重要意义,其交互可减少园区的碳排放以及降低园区的运行成本。首先,构建绿证-阶梯式碳交易的数学计算模型;其次,引入需求响应机制,引导用户用电行为,促进新能源的消纳,降低系统运行成本;然后,将系统运行总成本与总碳排放作为多目标优化调度的目标函数,求解模型获得帕累托解集,采用逼近理想解排序法(technique for order preference by similarity to ideal solution,TOPSIS)-灰色关联分析法来获取帕累托解集的理想解;最后,设置多个场景进行对比分析,验证了所提模型的实用性与有效性。展开更多
The heat transfer of a magnetohydrodynamics nanofluid inside an annulus considering the second-order slip condition and nanoparticle migration is theoret-ically investigated. A second-order slip condition, which appro...The heat transfer of a magnetohydrodynamics nanofluid inside an annulus considering the second-order slip condition and nanoparticle migration is theoret-ically investigated. A second-order slip condition, which appropriately represents the non-equilibrium region near the interface, is prescribed rather than the no-slip condition and the linear Navier slip condition. To impose different temperature gradients, the outer wall is subjected to q2, the inner wall is subjected to q1, and q1 〉 q2. A modified two-component four-equation non-homogeneous equilibrium model is employed for the nanofiuid, which have been reduced to two-point ordinary boundary value differential equations in the consideration of the thermally and hydrodynamically fully developed flow. The homotopy analysis method （HAM） is employed to solve the equations, and the h-curves are plotted to verify the accuracy and efficiency of the solutions. Moreover, the effects of the physical factors on the flow and heat transfer are discussed in detail, and the semi-analytical relation between NUB and NBT is obtained.展开更多
文摘为响应“双碳”战略目标,阶梯式碳交易、绿证交易与需求响应的交互联动具有重要意义,其交互可减少园区的碳排放以及降低园区的运行成本。首先,构建绿证-阶梯式碳交易的数学计算模型;其次,引入需求响应机制,引导用户用电行为,促进新能源的消纳,降低系统运行成本;然后,将系统运行总成本与总碳排放作为多目标优化调度的目标函数,求解模型获得帕累托解集,采用逼近理想解排序法(technique for order preference by similarity to ideal solution,TOPSIS)-灰色关联分析法来获取帕累托解集的理想解;最后,设置多个场景进行对比分析,验证了所提模型的实用性与有效性。
基金Project supported by the National Natural Science Foundation of China(Nos.51476191 and51406008)
文摘The heat transfer of a magnetohydrodynamics nanofluid inside an annulus considering the second-order slip condition and nanoparticle migration is theoret-ically investigated. A second-order slip condition, which appropriately represents the non-equilibrium region near the interface, is prescribed rather than the no-slip condition and the linear Navier slip condition. To impose different temperature gradients, the outer wall is subjected to q2, the inner wall is subjected to q1, and q1 〉 q2. A modified two-component four-equation non-homogeneous equilibrium model is employed for the nanofiuid, which have been reduced to two-point ordinary boundary value differential equations in the consideration of the thermally and hydrodynamically fully developed flow. The homotopy analysis method （HAM） is employed to solve the equations, and the h-curves are plotted to verify the accuracy and efficiency of the solutions. Moreover, the effects of the physical factors on the flow and heat transfer are discussed in detail, and the semi-analytical relation between NUB and NBT is obtained.
