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Thermal and hydraulic characteristics of a large-scaled parabolic trough solar field (PTSF) under cloud

Linrui MA, Zhifeng WANG, Ershu XU, Li XU

Frontiers in Energy 2020, Volume 14, Issue 2,   Pages 283-297 doi: 10.1007/s11708-019-0649-4

Abstract: parabolic trough solar field (PTSF) under cloud passages, a novel method which combines a closed-loop thermalhydraulic model (CLTHM) and cloud vector (CV) is developed.simulation, all essential parameters, such as the total flowrate, flow distribution, outlet temperature, thermalIn addition, the mechanism of thermal and hydraulic unbalance caused by cloud passages are explained

Keywords： parabolic trough solar field (PTSF)     thermal hydraulic model     cloud passages     transients    

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Thermal-hydraulic performance of novel louvered fin using flat tube cross-flow heat exchanger

DONG Junqi, CHEN Jiangping, CHEN Zhijiu

Frontiers in Energy 2008, Volume 2, Issue 1,   Pages 99-106 doi: 10.1007/s11708-008-0010-9

Abstract: The air side thermal performance data were analyzed using the effectiveness-NTU method.Finally, the area optimization factor was used to evaluate the thermal hydraulic performance of the louveredwith the decrease of the fin space and fin length, and the fin space has more obvious effect on the thermalhydraulic characteristics of the novel louvered fins.

Keywords： obvious effect     different     thermal hydraulic     constant tube-side     Colburn    

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Steady-state thermal-hydraulic analysis of SCWR assembly

LIU Xiaojing, CHENG Xu

Frontiers in Energy 2008, Volume 2, Issue 4,   Pages 475-478 doi: 10.1007/s11708-008-0093-3

Abstract: supercritical water-cooled reactor (SCWR), the only reactor with water as coolant, achieves a high thermalA thermal-hydraulic analysis of the SCWR assembly is performed in this paper using the modified COBRA-IVreduce the hot channel factor are investigated: decreasing the moderator mass flow and increasing the thermal

Keywords： cladding temperature     assembly     temperature     coolant     resistance    

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Hydromechanical model for hydraulic fractures using XFEM

Bo HE

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 1,   Pages 240-249 doi: 10.1007/s11709-018-0490-6

Abstract: In this study, a hydromechanical model for fluid flow in fractured porous media is presented.Furthermore, the model is extended to includes crack propagation.examples are presented to demonstrate the versatility and efficiency of this two-scale hydromechanical model

Keywords： multi-phase medium     porous     fracture     multi-scale method    

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CFD Simulation of thermal hydraulic characteristics in a typical upper plenum of RPV

Mingjun WANG, Lianfa WANG, Yingjie WANG, Wenxi TIAN, Jian DENG, Guanghui SU, Suizheng QIU

Frontiers in Energy 2021, Volume 15, Issue 4,   Pages 930-945 doi: 10.1007/s11708-021-0728-1

Abstract: A comparative computational fluid dynamics (CFD) study was conducted on the three different types of pressurized water reactor (PWR) upper plenum, named TYPE 1 (support columns (SCs) and control rod guide tubes (CRGTs) with two large windows), TYPE 2 (SCs and CRGTs without windows), and TYPE 3 (two parallel perforated barrel shells and CRGTs). First, three types of upper plenum geometry information were collected, simplified, and adopted into the BORA facility, which is a 1/5 scale system of the four-loop PWR reactor. Then, the geometry, including the upper half core, upper plenum region, and hot legs, was built using the platform. After that, an unsteady calculation to simulate the reactor balance operation at hot full power scenario was performed. Finally, the differences of flowrate distribution at the core outlet and temperature distribution and transverse velocity inside the hot legs with different upper plenum internals were compared. The results suggest that TYPE 1 upper plenum internals cause the largest flowrate difference at the core outlet while TYPE 3 leads to the most even distributed flowrate. The distribution and evolution pattern of the tangential velocity inside hot legs is highly dependent on the upper plenum internals. Two counter-rotating swirls exist inside the TYPE 1 hot leg and only one swirl revolving around the hog leg axis exist inside the TYPE 2 hot leg. For TYPE 3, two swirls like that of TYPE 1 rotating around the hot leg axis significantly increase the temperature homogenization speed. This research provides meaningful guidelines for the future optimization and design of advanced PWR upper plenum internal structures.

Keywords： pressurized water reactor (PWR)     upper plenum     internal structures     temperature distribution     computational fluid dynamics (CFD)    

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Influence evaluation of loading conditions during pressurized thermal shock transients based on thermal-hydraulics

Jinya KATSUYAMA, Shumpei UNO, Tadashi WATANABE, Yinsheng LI

Frontiers of Mechanical Engineering 2018, Volume 13, Issue 4,   Pages 563-570 doi: 10.1007/s11465-018-0487-9

Abstract:

The thermal hydraulic (TH) behavior of coo-lant water is a key factor in the structural integrityassessments on reactor pressure vessels (RPVs) of pressurized water reactors (PWRs) under pressurized thermalthe influence of the operator action time on TH behavior during a PTS event, we developed an analysis modelanalysis with different operator action times, we also performed structural analyses for evaluating thermal-stress

Keywords： structural integrity     reactor pressure vessel     pressurized thermal shock     thermal hydraulic analysis     pressurized    

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Development of a steady thermal-hydraulic analysis code for the China Advanced Research Reactor

TIAN Wenxi, QIU Suizheng, GUO Yun, SU Guanghui, JIA Dounan, LIU Tiancai, ZHANG Jianwei

Frontiers in Energy 2007, Volume 1, Issue 2,   Pages 189-194 doi: 10.1007/s00000-007-0024-8

Abstract: A multi-channel model steady-state thermal-hydraulic analysis code was developed for the China Advancedand nuclear factor, calculation of the mean and hot channel was carried out and it is proved that all thermal-hydraulic

Keywords： detailed     calculation     unsymmetrical     temperature     channel    

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A modified zone model for estimating equivalent room thermal capacity

Hua CHEN, Xiaolin WANG

Frontiers in Energy 2013, Volume 7, Issue 3,   Pages 351-357 doi: 10.1007/s11708-013-0254-x

Abstract: The zone model has been widely applied in control analysis of heating, ventilation and air conditioningthe similar accuracy to the complicated simulation model.by introducing the thermal admittance of the inner surfaces of the building enclosure.The thermal admittance for the building enclosure was developed based on the building thermal networkThe efficacy of the proposed model was demonstrated by comparing it with the complicated model — heat

Keywords： room model     thermal network analysis     transfer function     heating     ventilation and air conditioning (HVAC)    

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Analysis of the core thermal-hydraulic characteristics of in-hospital neutron irradiatormark 1 reactor

Chen Lixin,Zhao Zhumin,Jiang Xinbiao,Zhu Lei,Zhou Yongmao

Strategic Study of CAE 2012, Volume 14, Issue 8,   Pages 51-55

Abstract: justify;">According to the characteristics and operation condition of IHNI-1 reactor, a subchannel modelIt also has been verified that the model is reasonable and effective in IHNI-1's thermal hydraulicUsing the model, some thermal parameters of IHNI-1reactor are calculated.

Keywords： IHNI-1 reactor     thermal-hydraulic     subchannel     safety analysis    

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Review of fluid and control technology of hydraulic wind turbines

Maolin CAI, Yixuan WANG, Zongxia JIAO, Yan SHI

Frontiers of Mechanical Engineering 2017, Volume 12, Issue 3,   Pages 312-320 doi: 10.1007/s11465-017-0433-2

Abstract:

This study examines the development of the fluid and control technology of hydraulic wind turbinesThe current state of hydraulic wind turbines as a new technology is described, and its basic fluid modelFinally, the advantages of hydraulic wind turbines are enumerated.Hydraulic wind turbines are expected to become the main development direction of wind turbines.

Keywords： wind turbine     hydraulic system     fluid model     control technology    

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Modelling the thresholds of nitrogen/phosphorus concentration and hydraulic retention time for bloom

Frontiers of Environmental Science & Engineering 2022, Volume 16, Issue 10, doi: 10.1007/s11783-022-1564-1

Abstract:

● A new model for bloom control in open land scape water was constructed

Keywords： Reclaimed water landscape     Algal bloom     Nitrogen and phosphorus     Hydraulic retention time     Threshold     Control model    

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Model-based nonlinear control of hydraulic servo systems: Challenges, developments and perspectives

Jianyong YAO

Frontiers of Mechanical Engineering 2018, Volume 13, Issue 2,   Pages 179-210 doi: 10.1007/s11465-018-0464-3

Abstract:

Hydraulic servo system plays a significant role in industries, and usually acts as a core point inEssential nonlinearity is a unique feature and makes model-based nonlinear control more attractive, dueto benefit from prior knowledge of the servo valve controlled hydraulic system.In this paper, a discussion for challenges in model-based nonlinear control, latest developments andbrief perspectives of hydraulic servo systems are presented: Modelling uncertainty in hydraulic system

Keywords： hydraulic servo system     adaptive control     robust control     nonlinear friction     disturbance compensation     repetitive    

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An autonomous system for thermal convection of viscoelastic fluids in a porous layer using a thermalnonequilibrium model

Qi WEI, Xiaohui ZHANG

Frontiers in Energy 2010, Volume 4, Issue 4,   Pages 507-516 doi: 10.1007/s11708-010-0017-x

Abstract: Thermal convection of viscoelastic fluids saturating a horizontal porous layer heated from below is analyzedusing a thermal nonequilibrium model to take account of the interphase heat transfer between the fluidThe effects of interphase heat transfer on the thermal convection of viscoelastic fluids in a porous

Keywords： thermal convection     porous media     viscoelastic fluid     thermal nonequilibrium model    

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Carbon performance evaluation model from the perspective of circular economy—The case of Chinese thermal

Zhifang ZHOU, Jinhao LIU, Huixiang ZENG, Mengmeng XU, Shihui LI

Frontiers of Engineering Management 2022, Volume 9, Issue 2,   Pages 297-311 doi: 10.1007/s42524-020-0143-z

Abstract: This paper expands the application boundary of matter–element model and supplements the literature of

Keywords： circular economy     carbon performance     comprehensive evaluation     thermal power enterprise    

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Cohesive zone model-based analyses of localized leakage of segmentally lined tunnels

Frontiers of Structural and Civil Engineering 2023, Volume 17, Issue 4,   Pages 503-521 doi: 10.1007/s11709-023-0927-4

Abstract: for simulating the localized leakage behavior of segmentally lined tunnels based on a cohesive zone modelis first verified via a tunnel drainage experiment, which reveals its merits over the existing local hydraulicThe proposed approach yields more accurate results than the classical local hydraulic conductivity method

Keywords： segmentally lined tunnel     localized leakage     cohesive element     hydraulic behavior     numerical modeling    

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Title Author Date Type Operation

Thermal and hydraulic characteristics of a large-scaled parabolic trough solar field (PTSF) under cloud

Linrui MA, Zhifeng WANG, Ershu XU, Li XU

Journal Article

Thermal-hydraulic performance of novel louvered fin using flat tube cross-flow heat exchanger

DONG Junqi, CHEN Jiangping, CHEN Zhijiu

Journal Article

Steady-state thermal-hydraulic analysis of SCWR assembly

LIU Xiaojing, CHENG Xu

Journal Article

Hydromechanical model for hydraulic fractures using XFEM

Bo HE

Journal Article

CFD Simulation of thermal hydraulic characteristics in a typical upper plenum of RPV

Mingjun WANG, Lianfa WANG, Yingjie WANG, Wenxi TIAN, Jian DENG, Guanghui SU, Suizheng QIU

Journal Article

Influence evaluation of loading conditions during pressurized thermal shock transients based on thermal-hydraulics

Jinya KATSUYAMA, Shumpei UNO, Tadashi WATANABE, Yinsheng LI

Journal Article

Development of a steady thermal-hydraulic analysis code for the China Advanced Research Reactor

TIAN Wenxi, QIU Suizheng, GUO Yun, SU Guanghui, JIA Dounan, LIU Tiancai, ZHANG Jianwei

Journal Article

A modified zone model for estimating equivalent room thermal capacity

Hua CHEN, Xiaolin WANG

Journal Article

Analysis of the core thermal-hydraulic characteristics of in-hospital neutron irradiatormark 1 reactor

Chen Lixin,Zhao Zhumin,Jiang Xinbiao,Zhu Lei,Zhou Yongmao

Journal Article

Review of fluid and control technology of hydraulic wind turbines

Maolin CAI, Yixuan WANG, Zongxia JIAO, Yan SHI

Journal Article

Modelling the thresholds of nitrogen/phosphorus concentration and hydraulic retention time for bloom

Journal Article

Model-based nonlinear control of hydraulic servo systems: Challenges, developments and perspectives

Jianyong YAO

Journal Article

An autonomous system for thermal convection of viscoelastic fluids in a porous layer using a thermalnonequilibrium model

Qi WEI, Xiaohui ZHANG

Journal Article

Carbon performance evaluation model from the perspective of circular economy—The case of Chinese thermal

Zhifang ZHOU, Jinhao LIU, Huixiang ZENG, Mengmeng XU, Shihui LI

Journal Article

Cohesive zone model-based analyses of localized leakage of segmentally lined tunnels

Journal Article