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simulation and experiment of a photovoltaic—air source heat pump system with thermal energy storage for heating and domestic hot water supply

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Building simulation 2023年第10期16卷 1897-1913页

作者： Junyu Da Ming Li Guoliang Li Yunfeng Wang Ying Zhang Solar Energy Research Institute Yunnan Normal UniversityNo.768Juxian StreetChenggong districtKunmingYunnan650500China

For China,the development of low-energy buildings is one of the necessary routes for achieving carbon neutrality.Combining photovoltaic(PV)with air source heat pump(ASHP)yields a great potential in providing heating and domestic hot water(DHW)supply in non-central heating areas.However,the diurnal and seasonal inconsistencies between solar availability and building heat load can severely affect the efficacy of solar energy systems.This study creates and numerically simulates a PV-ASHP system with thermal energy storage(TES)in transient system simulation software,TRNSYS.experimental studies are conducted to validate the simulation model.The system’s yearly operational characteristics are simulated to reveal the energy conversion relationship between the system’s thermoelectric storage and heating and DHW demand.The results show that the synergy between heating and DHW simultaneously improves the direct utilization of solar energy compared to single heating.The yearly self-consumption and self-satisfaction rates of PV and the COP of the ASHP increase by 131.25%,10.53%and 9.56%,respectively.Solar energy contributes 55.54%to the system,with a PV capacity of 82 W per square meter of building area.This study provides fresh approaches to developing flexible building-integrated PV-ASHP technologies and balance of the energy exchange among the PV,building load and TES.

关键词： PV-ASHP TRNSYS heating and DHW thermal energy storage simulation and experiment

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Analysis and experimental study on resistance-increasing behavior of composite high efficiency autonomous inflow control device

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Petroleum Science 2024年第2期21卷 1290-1304页

作者： Liang-Liang Dong Yu-Lin Zhang School of Mechatronic Engineering Southwest Petroleum UniversityChengdu610500SichuanChina State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu610500SichuanChina Oil and Gas Equipment Technology Sharing and Service Platform of Sichuan ProvinceChengdu610500SichuanChina

Bottom water coning is the main reason to reduce the recovery of horizontal bottom water reservoir. By water coning, we mean the oil-water interface changes from a horizontal state to a mound-shaped cone and breaks through to the wellbore. Autonomous inflow control device(AICD) is an important instrument maintain normal production after bottom water coning, however, the resistance increasing ability of the swirl type AICD is insufficient at present, which seriously affects the water control effect. Aiming this problem, this paper designs a multi-stage resistance-increasing and composite type AICD. The separation mechanism of oil-water two phases in this structure, the resistance form of oil-water single phase and the resistance-increasing principle of water phase are analyzed. Establishing the dual-phase multi-stage separation and resistance-increasing model, and verified by measuring the throttling pressure drop and oil-water volume fraction of the AICD, it is found that the composite type AICD has the effect of ICD and AICD at the same time, which can balance the production rate of each well section at the initial stage of production, delay the occurrence of bottom water coning. In the middle and later stages of production, water-blocking can be effectively increased to achieve water control and stable production.After structural sensitivity analysis, the influence law of various structural parameters on the water control performance of composite AICD was obtained. The simulation calculation results show that,compared with the existing swirl type AICD, composite AICD has higher sensitivity to moisture content,the water phase throttling pressure drop is increased by 4.5 times on average. The composite AICD is suitable for the entire stage of horizontal well production.

关键词： Water control Flow separation Flow resistance-increasing AICD device simulation and experiment

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Numerical simulation and experimental validation of multiphysics field coupling mechanisms for a high power ICP wind tunnel

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Chinese Physics B 2021年第6期30卷 390-400页

作者：喻明浩王哲邱泽洋吕博郑博睿 Faculty of Mechanical and Precision Instrument Engineering Xi'an University of TechnologyXi'an 710048China School of Automation and Information Engineering Xi'an University of TechnologyXi'an 710048China

We take the established inductively coupled plasma(ICP) wind tunnel as a research object to investigate the thermal protection system of re-entry vehicles. A 1.2-MW high power ICP wind tunnel is studied through numerical simulation and experimental validation. The distribution characteristics and interaction mechanism of the flow field and electromagnetic field of the ICP wind tunnel are investigated using the multi-field coupling method of flow, electromagnetic, chemical, and thermodynamic field. The accuracy of the numerical simulation is validated by comparing the experimental results with the simulation results. Thereafter, the wind tunnel pressure, air velocity, electron density, Joule heating rate, Lorentz force, and electric field intensity obtained using the simulation are analyzed and discussed. The results indicate that for the 1.2-MW ICP wind tunnel, the maximum values of temperature, pressure, electron number density, and other parameters are observed during coil heating. The influence of the radial Lorentz force on the momentum transfer is stronger than that of the axial Lorentz force. The electron number density at the central axis and the amplitude and position of the Joule heating rate are affected by the radial Lorentz force. Moreover, the plasma in the wind tunnel is constantly in the subsonic flow state, and a strong eddy flow is easily generated at the inlet of the wind tunnel.

关键词： inductively coupled plasma multiphysics field coupling mechanism simulation and experiment

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External Characteristics simulation of High-speed Rail Anti-snake Shock Absorber

External Characteristics Simulation of High-speed Rail Anti-...

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2018中国汽车工程学会年会

作者： LIU Qiu SUN Jingwei HU Xu WANG Zhengyu GU Liang Beijing Institute of Technology

For the valve plate in high-speedrail anti-snake shock absorber,it is difficult to obtain analytical formulas for its deformation using only the principle of elastic mechanics.Therefore,the finite element method and the principle of elastic mechanics are used to calculate the deformation of valve plate.At the same time,the mathematical model of shock absorber is established based on the actual structure of anti-snake shock absorber and the related theories of hydraulic fluid mechanics.Finally,the purpose of computer simulation of external characteristics of shock absorber is achieved by loading a certain excitation signal.The simulation and test results show that the calculation method of valve plate deformation and the established mathematical model are accurate and reasonable.It is of great significance to accurately calculate the deformation of valve plate under complex force conditions and to accurately model the shock absorber.

关键词： finite element method hydraulic shock absorbers parametric modeling simulation and experiment

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