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Performance analysis of cogeneration systems based on micro gas turbine (MGT), organic Rankine cycle and ejector refrigeration cycle

Zemin BO, Kai ZHANG, Peijie SUN, Xiaojing LV, Yiwu WENG

Frontiers in Energy 2019, Volume 13, Issue 1,   Pages 54-63 doi: 10.1007/s11708-018-0606-7

Abstract: The effect of 5 different working fluids on cogeneration systems was studied.For the effect of different working fluids, R123 is the most suitable working fluid for MGT+ ORC withthe maximum electricity output power and R600 is the most suitable working fluid for MGT+ ERC with the

Keywords： cogeneration system     different working fluids     micro gas turbine (MGT)     organic Rankine cycle (ORC)     ejector    

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Experimental study on working parameters of earth pressure balance shield machine tunneling in soft ground

ZHU Hehua, LIAO Shaoming, XU Qianwei, ZHENG Qizhen

Frontiers of Structural and Civil Engineering 2008, Volume 2, Issue 4,   Pages 350-358 doi: 10.1007/s11709-008-0051-5

Abstract: excavation, using the running tunnel of the Shanghai Metro Line M8 as a background, are carried out with differentSuch findings can not only facilitate establishing relationships between shield working parameters and

Keywords： construction     different     coastal     conveyor     excavation    

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Performance design of a cryogenic air separation unit for variable working conditions using the lumped

Jinghua XU, Tiantian WANG, Qianyong CHEN, Shuyou ZHANG, Jianrong TAN

Frontiers of Mechanical Engineering 2020, Volume 15, Issue 1,   Pages 24-42 doi: 10.1007/s11465-019-0558-6

Abstract: petrochemical and semiconductor industries, are being developed with high operating elasticity under variable workingDifferent from discrete processes in traditional machinery manufacturing, the ASU process is continuousmaterial and energy conservation laws, the piecewise-lumped parameters are extracted under variable workingdetection is recursively utilized to determine whether the critical point is detected or not by using differentexchangers, and packing column of a 100000 Nm O /h large-scale ASU is enhanced to adapt to variable working

Keywords： performance design     air separation unit (ASU)     lumped parameter model (LPM)     variable working conditions    

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Analysis and experiment of controllability of magnetorheological fluids based on micro-pipeline

Yongqing SU, Yikuan SONG, Jiguang YUE

Frontiers of Mechanical Engineering 2009, Volume 4, Issue 3,   Pages 339-344 doi: 10.1007/s11465-009-0048-3

Abstract: The controllability of the magneto-rheological fluid (MRF) flowing through a micro-pipeline is analyzed. The coupled formulas for MRF are deduced by analyzing the property of the flow field and magnetic field. Then, the relationship between the flow speed of MRF and the special shear stress under the effect of the magnetic field is founded. The model of the MRF and micro-pipeline is established by using multi-physics software of Comsol, the curve of - in an ideal condition is attained by modifying parameters, and by adding the boundary condition of the model. This paper provides a theoretical proof of the controllability of MRF flowing through the micro-pipeline and explores MRF’s application on the micro-drive and control field.

Keywords： Magneto-rheological fluids (MRF)     micro-pipeline     coupled model     multi-physics simulation    

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

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 analyzedThe 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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Two-level uncapacitated lot-sizing problem considering the financing cost of working capital requirement

Yuan BIAN, David LEMOINE, Thomas G. YEUNG, Nathalie BOSTEL

Frontiers of Engineering Management 2020, Volume 7, Issue 2,   Pages 248-258 doi: 10.1007/s42524-019-0069-5

Abstract: Working capital requirement (WCR) has been recognized as a key factor for releasing tied up cash in companies

Keywords： two-level ULS problem     lot-sizing     working capital requirement     ZIO property     infinite production capacity    

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Combined static mixers for high viscous fluids mixing

Zhenhao XI, Weizhen SUN, Ling ZHAO, Zhaoyan LIU

Frontiers of Chemical Science and Engineering 2009, Volume 3, Issue 1,   Pages 93-96 doi: 10.1007/s11705-009-0112-x

Abstract: A new static mixer Cross-over-Disc has been invented to strip off the boundary layer and to make strong radial mixing. The pressure drop of Cross-over-Disc is 12—26 times as large as that of empty pipe with equivalent diameter and length. The mixing performance of Cross-over-Disc with 14 elements has been investigated in the viscosity range of 190—250 Pa?s by decoloration method, and the gray analysis of images shows that mixing inhomogeneity is about 7.5% and 9.4% for the mixing ratio of 5∶1 and 10∶1, respectively. Furthermore, mixing inhomogeneity for a combination of static mixing elements (four from Cross-over-Disc and three pairs from Sulzer-type) can be decreased to 2.1%—3.1% within a reasonable range of pressure drop.

Keywords： static mixer     Cross-over-Disc     pressure drop     mixing performance     high viscous fluid    

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A method to calculate working capacity space of multi-DOF manipulator and the application in excavating

Baochen WEI, Feng GAO

Frontiers of Mechanical Engineering 2012, Volume 7, Issue 2,   Pages 109-119 doi: 10.1007/s11465-012-0323-6

Abstract:

Working capacity refers to the velocity output and force output of a manipulator.In this paper, the method of Linear Programming and a geometric method are proposed to calculate workingcapacity spaces in different situations.

Keywords： working capacity     multi-DOF manipulator     capacity polytope     excavating mechanism    

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Unit commitment using dynamic programming–an exhaustive working of both classical and stochastic approach

Balasubramaniyan SARAVANAN, Surbhi SIKRI, K. S. SWARUP, D. P. KOTHARI

Frontiers in Energy 2013, Volume 7, Issue 3,   Pages 333-341 doi: 10.1007/s11708-013-0259-5

Abstract: In the present electricity market, where renewable energy power plants have been included in the power systems, there is a lot of unpredictability in the demand and generation. There are many conventional and evolutionary programming techniques used for solving the unit commitment (UC) problem. Dynamic programming (DP) is a conventional algorithm used to solve the deterministic problem. In this paper DP is used to solve the stochastic model of UC problem. The stochastic modeling for load and generation side has been formulated using an approximate state decision approach. The programs were developed in a MATLAB environment and were extensively tested for a four-unit eight-hour system. The results obtained from these techniques were validated with the available literature and outcome was good. The commitment is in such a way that the total cost is minimal. The novelty of this paper lies in the fact that DP is used for solving the stochastic UC problem.

Keywords： unit commitment (UC)     deterministic     stochastic     dynamic programming (DP)     optimization     state diagram    

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Exergy analysis of R1234ze(Z) as high temperature heat pump working fluid with multi-stage compression

Bin HU, Di WU, L.W. WANG, R.Z. WANG

Frontiers in Energy 2017, Volume 11, Issue 4,   Pages 493-502 doi: 10.1007/s11708-017-0510-6

Abstract: exergy analysis of multi-stage compression high temperature heat pump (HTHP) systems with R1234ze(Z) workingThe exergy destruction ratios of each component for different stage compression systems are compared.

Keywords： multi-stage compression     high temperature heat pump     heat recovery     exergy destruction     R1234ze(Z) working    

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Working Up Green, and Living Up Green

Ji-shan He

Frontiers of Engineering Management 2014, Volume 1, Issue 1,   Pages 2-2 doi: 10.15302/J-FEM-2014002

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Performance of a bi-layer solar steam generation system working at a high-temperature of top surface

Jinxin ZHONG, Congliang HUANG

Frontiers in Energy 2023, Volume 17, Issue 1,   Pages 141-148 doi: 10.1007/s11708-021-0725-4

Abstract: Many efforts have been focused on enhancing the vapor generation in bi-layer solar steam generation systems for obtaining as much pure water as possible. However, the methods to enhance the vapor temperature is seldom studied although the high-temperature vapor has a wide use in medical sterilization and electricity generation. In this work, to probe the high-temperature vapor system, an improved macroscopic heat and mass transfer model was proposed. Then, using the finite element method to solve the model, the influences of some main factors on the evaporation efficiency and vapor temperature were discussed, including effects of the vapor transport conditions and the heat dissipation conditions. The results show that the high-temperature vapor could not be obtained by enhancing the heat-insulating property of the bi-layer systems but by applying the optimal porosity and proper absorbers. This paper is expected to provide some information for designing a bi-layered system to produce high-temperature vapor.

Keywords： solar steam generation     solar energy     numerical method     porous material    

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Characteristics Analysis of Integrated CAES and CFPP Trigeneration System Considering Working Conditions

Jiajia Li,Peigang Yan,Guowen Zhou,Xingshuo Li,Qiang Li,Jinfu Liu,Daren Yu,

Engineering doi: 10.1016/j.eng.2023.06.015

Abstract: Considering the working conditions of the CFPP, thermal characteristics of three typical operation modesRegarding the effect of different application scenarios in terms of economics, investing in the proposed

Keywords： Compressed air energy storage     CFPP–CAES combined cycle     Thermodynamic performance     Technical economics    

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Working Procedure of Developing a New Deep Hard-rock Burst-prone Deposit

Guo Ran,Yu Runcang

Strategic Study of CAE 2002, Volume 4, Issue 7,   Pages 51-55

Abstract: In this paper, the authors create a general working procedure to develop a new hard-rock burst-prone

Keywords： rockburst     mining technique     working procedure    

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The Research of the Working Parameter Adjustment Principle and Control Strategy on Hydraulic Impact Machine

Liu Zhong,,Chu Fulei,Long Guojian,Liao Yongzhong

Strategic Study of CAE 2005, Volume 7, Issue 10,   Pages 73-77

Abstract:

This paper analyses the working parameter adjustment methods for hydraulic impact machine at home

Keywords： hydraulic impact machine     continual adjust     working parameter     control system    

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Title Author Date Type Operation

Performance analysis of cogeneration systems based on micro gas turbine (MGT), organic Rankine cycle and ejector refrigeration cycle

Zemin BO, Kai ZHANG, Peijie SUN, Xiaojing LV, Yiwu WENG

Journal Article

Experimental study on working parameters of earth pressure balance shield machine tunneling in soft ground

ZHU Hehua, LIAO Shaoming, XU Qianwei, ZHENG Qizhen

Journal Article

Performance design of a cryogenic air separation unit for variable working conditions using the lumped

Jinghua XU, Tiantian WANG, Qianyong CHEN, Shuyou ZHANG, Jianrong TAN

Journal Article

Analysis and experiment of controllability of magnetorheological fluids based on micro-pipeline

Yongqing SU, Yikuan SONG, Jiguang YUE

Journal Article

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

Qi WEI, Xiaohui ZHANG

Journal Article

Two-level uncapacitated lot-sizing problem considering the financing cost of working capital requirement

Yuan BIAN, David LEMOINE, Thomas G. YEUNG, Nathalie BOSTEL

Journal Article

Combined static mixers for high viscous fluids mixing

Zhenhao XI, Weizhen SUN, Ling ZHAO, Zhaoyan LIU

Journal Article

A method to calculate working capacity space of multi-DOF manipulator and the application in excavating

Baochen WEI, Feng GAO

Journal Article

Unit commitment using dynamic programming–an exhaustive working of both classical and stochastic approach

Balasubramaniyan SARAVANAN, Surbhi SIKRI, K. S. SWARUP, D. P. KOTHARI

Journal Article

Exergy analysis of R1234ze(Z) as high temperature heat pump working fluid with multi-stage compression

Bin HU, Di WU, L.W. WANG, R.Z. WANG

Journal Article

Working Up Green, and Living Up Green

Ji-shan He

Journal Article

Performance of a bi-layer solar steam generation system working at a high-temperature of top surface

Jinxin ZHONG, Congliang HUANG

Journal Article

Characteristics Analysis of Integrated CAES and CFPP Trigeneration System Considering Working Conditions

Jiajia Li,Peigang Yan,Guowen Zhou,Xingshuo Li,Qiang Li,Jinfu Liu,Daren Yu,

Journal Article

Working Procedure of Developing a New Deep Hard-rock Burst-prone Deposit

Guo Ran,Yu Runcang

Journal Article

The Research of the Working Parameter Adjustment Principle and Control Strategy on Hydraulic Impact Machine

Liu Zhong,,Chu Fulei,Long Guojian,Liao Yongzhong

Journal Article