根据储能元件Ragone曲线,提出了储能的设计方法。首先介绍了储能元件Ragone曲线的内涵,提出了基于储能元件数学模型的Ragone曲线绘制方法,推导并绘制了超级电容器的Ragone曲线。提出了基于Ragone曲线的储能元件的选择原则和容量计算方法...根据储能元件Ragone曲线,提出了储能的设计方法。首先介绍了储能元件Ragone曲线的内涵,提出了基于储能元件数学模型的Ragone曲线绘制方法,推导并绘制了超级电容器的Ragone曲线。提出了基于Ragone曲线的储能元件的选择原则和容量计算方法,以20k W 500k J储能系统为设计实例,进行了储能系统设计实例设计、仿真和实验证实了上述方法的有效性。展开更多
紧追 P ZERO 的升级新选择如果您的年纪够长,应该会记得市场在10年前,一般市售车的原厂轮胎规格几乎都只有13英寸,以 HONDA CIVIC(本田思域)为例,基本升级规格是185/60/14,就目前的水准看来真的是小得可怜,但在当时已经是非常不得了。...紧追 P ZERO 的升级新选择如果您的年纪够长,应该会记得市场在10年前,一般市售车的原厂轮胎规格几乎都只有13英寸,以 HONDA CIVIC(本田思域)为例,基本升级规格是185/60/14,就目前的水准看来真的是小得可怜,但在当时已经是非常不得了。时至今日,195/50/15已经成为 CIVIC 的基本规格,205/45/16才算是升级规格,这个演进的事实证实了过去 INCH UP"+1"的升级观念已经进化到"+2",而且已经不再局限在特定车款,举凡轿车、跑车、SUV,甚至是日系 K Car 的车主都大有人改。可是,升级轮毂不难。展开更多
Geothermal energy piles(GEPs)buried into the deep underground are typically integrated with the circulating pipe inside the piles,where the most common heat transfer fluid(HTF)is water.Liquified carbon dioxide(CO_(2))...Geothermal energy piles(GEPs)buried into the deep underground are typically integrated with the circulating pipe inside the piles,where the most common heat transfer fluid(HTF)is water.Liquified carbon dioxide(CO_(2)),as an alternative HTF to water,is more energy-saving by its density difference and circulation in exothermic and endothermic processes,and has a more extensive application for its usability below zero degrees Celsius.In this study,thermal performances of CO_(2)and H2O in 10-h-long daily operation time in the GEP system are modelled using a finite element method(FEM).Isolated influences of temperatures and pressures on HTF performances in a small-scale single-layer tube embedded in field-scale soils are investigated.The Ragone plot,with the Péclet number of HIF being the key indicator,is introduced to evaluate such performances.The results quantitatively show that CO_(2)and water in GEPs have a comparable heat extraction rate;although GEPs circulated with CO_(2)consume a lower average power,a higher accumulatively extracted energy than water is encountered when operated under a similar Péclet number.It is also found that,to acquire the same system power efficiency,CO_(2)-GEP could respectively reach up to 4 times the power efficiency and 10 times the energy density than those of water.展开更多
文摘根据储能元件Ragone曲线,提出了储能的设计方法。首先介绍了储能元件Ragone曲线的内涵,提出了基于储能元件数学模型的Ragone曲线绘制方法,推导并绘制了超级电容器的Ragone曲线。提出了基于Ragone曲线的储能元件的选择原则和容量计算方法,以20k W 500k J储能系统为设计实例,进行了储能系统设计实例设计、仿真和实验证实了上述方法的有效性。
文摘紧追 P ZERO 的升级新选择如果您的年纪够长,应该会记得市场在10年前,一般市售车的原厂轮胎规格几乎都只有13英寸,以 HONDA CIVIC(本田思域)为例,基本升级规格是185/60/14,就目前的水准看来真的是小得可怜,但在当时已经是非常不得了。时至今日,195/50/15已经成为 CIVIC 的基本规格,205/45/16才算是升级规格,这个演进的事实证实了过去 INCH UP"+1"的升级观念已经进化到"+2",而且已经不再局限在特定车款,举凡轿车、跑车、SUV,甚至是日系 K Car 的车主都大有人改。可是,升级轮毂不难。
文摘Geothermal energy piles(GEPs)buried into the deep underground are typically integrated with the circulating pipe inside the piles,where the most common heat transfer fluid(HTF)is water.Liquified carbon dioxide(CO_(2)),as an alternative HTF to water,is more energy-saving by its density difference and circulation in exothermic and endothermic processes,and has a more extensive application for its usability below zero degrees Celsius.In this study,thermal performances of CO_(2)and H2O in 10-h-long daily operation time in the GEP system are modelled using a finite element method(FEM).Isolated influences of temperatures and pressures on HTF performances in a small-scale single-layer tube embedded in field-scale soils are investigated.The Ragone plot,with the Péclet number of HIF being the key indicator,is introduced to evaluate such performances.The results quantitatively show that CO_(2)and water in GEPs have a comparable heat extraction rate;although GEPs circulated with CO_(2)consume a lower average power,a higher accumulatively extracted energy than water is encountered when operated under a similar Péclet number.It is also found that,to acquire the same system power efficiency,CO_(2)-GEP could respectively reach up to 4 times the power efficiency and 10 times the energy density than those of water.
