The high temperature and high pressure visualization pressure-volume-temperature(PVT)experiments of different gas media-crude oil were carried using the interface disappearance method.There are two miscible temperatur...The high temperature and high pressure visualization pressure-volume-temperature(PVT)experiments of different gas media-crude oil were carried using the interface disappearance method.There are two miscible temperature domains in the miscibility of CO_(2)-crude oil during heating process under constant pressure.Under the experiment pressure of 15 MPa,when the temperature is less than 140℃,the miscible zone shows liquid phase characteristics,and increasing the temperature inhibits the miscible process;when the temperature is greater than 230℃,the miscible zone tends to show gas phase characteristics,and increasing the temperature is conducive to the miscibility formation.Under a certain pressure,with the increase of temperature,the miscibility of flue gas,nitrogen and crude oil is realized.When the temperature is low,the effect of CO_(2) on promoting miscibility is obvious,and the order of miscible temperature of gas medium and crude oil is N_(2)>flue gas>CO_(2);however,when the temperature is high,the effect of CO_(2) on promoting miscibility gradually decreases,and the miscible temperature of N_(2) and crude oil is close to that of flue gas.The miscibility is dominated by the distillation and volatilization of light components of crude oil.There are many light hydrocarbon components in the gas phase at phase equilibrium,and the miscible zone is characterized by gas phase.展开更多
对一种中型直膨式太阳能PVT(光伏/光热)热泵热电联产系统进行了实验研究。通过对PV(光伏)组件与直膨式集热/蒸发器的合理耦合构建PVT热泵系统,直膨式背板可吸收太阳能电池废热,降低太阳能电池温度,有效提高光伏组件发电效率,同时提高了...对一种中型直膨式太阳能PVT(光伏/光热)热泵热电联产系统进行了实验研究。通过对PV(光伏)组件与直膨式集热/蒸发器的合理耦合构建PVT热泵系统,直膨式背板可吸收太阳能电池废热,降低太阳能电池温度,有效提高光伏组件发电效率,同时提高了热泵循环蒸发温度和蒸发压力,改善了热泵系统的运行性能。背板采用新型直膨式集热/蒸发器流道结构,结合PVT组件阵列管路设计,有效提升了冷媒分布均一性和PVT组件工作温度的均匀性。实验结果表明系统在热水模式下的平均COP(Coefficient of Performance)可达6.45,供暖模式的平均COP达4.24。系统所发电量可用于自身压缩机、水泵运行或并入电网,且提供55℃以上的热水,从而实现太阳能PVT热泵系统高效热电联产。展开更多
太阳能光伏光热一体化系统(hybrid photovoltaic-thermal solar system-PVT系统)作为一种利用太阳能同时获得电收益和热收益的新型能源利用方式,近年来受到学者的广泛关注。本文搭建了PVT系统电、热性能综合实验台,通过全天实验,分别研...太阳能光伏光热一体化系统(hybrid photovoltaic-thermal solar system-PVT系统)作为一种利用太阳能同时获得电收益和热收益的新型能源利用方式,近年来受到学者的广泛关注。本文搭建了PVT系统电、热性能综合实验台,通过全天实验,分别研究和分析了系统的温度特性与相对电效率的关系。结果表明,在日照条件较好,系统循环水温较低的情况下,PVT系统的电效率与普通光伏电池相比可以提高约7%。同时,文章还分析了PVT系统内水的温度一天内的变化情况,提出了在午后太阳辐射强度逐渐减弱,环境温度逐渐升高时如何保持PVT系统较高电效率的方法。展开更多
基金Supported by the Petro China Science and Technology Project(2023ZG18)。
文摘The high temperature and high pressure visualization pressure-volume-temperature(PVT)experiments of different gas media-crude oil were carried using the interface disappearance method.There are two miscible temperature domains in the miscibility of CO_(2)-crude oil during heating process under constant pressure.Under the experiment pressure of 15 MPa,when the temperature is less than 140℃,the miscible zone shows liquid phase characteristics,and increasing the temperature inhibits the miscible process;when the temperature is greater than 230℃,the miscible zone tends to show gas phase characteristics,and increasing the temperature is conducive to the miscibility formation.Under a certain pressure,with the increase of temperature,the miscibility of flue gas,nitrogen and crude oil is realized.When the temperature is low,the effect of CO_(2) on promoting miscibility is obvious,and the order of miscible temperature of gas medium and crude oil is N_(2)>flue gas>CO_(2);however,when the temperature is high,the effect of CO_(2) on promoting miscibility gradually decreases,and the miscible temperature of N_(2) and crude oil is close to that of flue gas.The miscibility is dominated by the distillation and volatilization of light components of crude oil.There are many light hydrocarbon components in the gas phase at phase equilibrium,and the miscible zone is characterized by gas phase.
文摘对一种中型直膨式太阳能PVT(光伏/光热)热泵热电联产系统进行了实验研究。通过对PV(光伏)组件与直膨式集热/蒸发器的合理耦合构建PVT热泵系统,直膨式背板可吸收太阳能电池废热,降低太阳能电池温度,有效提高光伏组件发电效率,同时提高了热泵循环蒸发温度和蒸发压力,改善了热泵系统的运行性能。背板采用新型直膨式集热/蒸发器流道结构,结合PVT组件阵列管路设计,有效提升了冷媒分布均一性和PVT组件工作温度的均匀性。实验结果表明系统在热水模式下的平均COP(Coefficient of Performance)可达6.45,供暖模式的平均COP达4.24。系统所发电量可用于自身压缩机、水泵运行或并入电网,且提供55℃以上的热水,从而实现太阳能PVT热泵系统高效热电联产。
文摘太阳能光伏光热一体化系统(hybrid photovoltaic-thermal solar system-PVT系统)作为一种利用太阳能同时获得电收益和热收益的新型能源利用方式,近年来受到学者的广泛关注。本文搭建了PVT系统电、热性能综合实验台,通过全天实验,分别研究和分析了系统的温度特性与相对电效率的关系。结果表明,在日照条件较好,系统循环水温较低的情况下,PVT系统的电效率与普通光伏电池相比可以提高约7%。同时,文章还分析了PVT系统内水的温度一天内的变化情况,提出了在午后太阳辐射强度逐渐减弱,环境温度逐渐升高时如何保持PVT系统较高电效率的方法。
