Results 111 to 120 of about 489,288 (151)

供热回水温度对跨临界CO2热泵系统性能的影响研究

open access: yes
环境温度和热用户实际用热情况会影响供热回水温度,进而显著影响跨临界CO2热泵系统的性能。针对这一变工况问题,建立了跨临界CO2热泵系统理论分析模型,采用数值仿真方法研究了常规跨临界CO2热泵系统和带回热器的跨临界CO2热泵系统在不同供热回水温度下供热温度和制热性能系数COPh等性能参数的变化规律。结果表明:对于两种跨临界CO2热泵系统,随着供热回水温度的升高,系统供热温度在某一特定温度范围内(压缩机排气压力为8 MPa时供热回水温度约为20℃)迅速跃升,而后保持不变(常规热泵系统)或持续升高 ...
潘利生   +4 more
core   +1 more source

[Efficacy of thermo-expandable nickel-titanium alloy ureteral stent placement as maintenance therapy for ureteral strictures]. [PDF]

open access: yesBeijing Da Xue Xue Bao Yi Xue Ban
Chen G   +7 more
europepmc   +1 more source

[A case of <i>Bartonella henselae</i> meningitis characterized by bone marrow hemophagocytosis]. [PDF]

open access: yesZhongguo Dang Dai Er Ke Za Zhi
DU WQ   +6 more
europepmc   +1 more source

Home - About - Disclaimer - Privacy