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Evaluation of the performance of a centralized ground-water heat pump system in cold climate region

Shilei LU,Zhe CAI,Li ZHANG,Yiran LI

Frontiers in Energy 2014, Volume 8, Issue 3,   Pages 394-402 doi: 10.1007/s11708-014-0310-1

Abstract: The aim of this study is to evaluate the performance of a centralized open-loop ground-water heat pumpThe analysis of the testing data indicates that the average heat-pump coefficient of performance (COPTherefore, some suggestions are proposed to improve the performance for GWHPs in the cold climate region

Keywords： ground-water heat pump (GWHP)     actual coefficient of performance     heat transfixion    

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Compressor performance of two-stage turbocharging system

HE Yituan, MA Chaochen, WEI Mingshan, ZHU Zhifu, HE Yituan

Frontiers of Mechanical Engineering 2008, Volume 3, Issue 2,   Pages 218-221 doi: 10.1007/s11465-008-0027-0

Abstract: To study the performance of high and low stage compressors and that of the system as a whole, a two-stagecurve, the speeds of the two stage turbochargers were adjusted to the fixed data, and a compressor performanceThe results showed many differences between the corrected mass flow and the actual mass flow of the highTo find out the actual supercharging effect of the two-stage turbocharging system, it is better to adoptthe actual mass flow.

Keywords： special two-stage     HP     performance experiment     reliability     actual supercharging    

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Performance of rolling piston type rotary compressor using fullerenes (C70) and NiFe

Ruixiang WANG,Yihao ZHANG,Yi LIAO

Frontiers in Energy 2020, Volume 14, Issue 3,   Pages 644-648 doi: 10.1007/s11708-017-0453-y

Abstract: A novel way for a compressor to improve its coefficient of performance was proposed in this paper.fullerenes nanocomposite is higher than 60 ppm and the concentration of nano-oil is 2 g/L, the friction coefficientThe coefficient of performance of the compressor under the air conditioning test condition can be raised

Keywords： rotary compressor     friction coefficient     nanocomposite materials     coefficient of performance     fullerenes    

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Nonlinear design-point performance adaptation approaches and their comparisons for gas turbine applications

Y. G. LI, P. PILIDIS,

Frontiers in Energy 2009, Volume 3, Issue 4,   Pages 446-455 doi: 10.1007/s11708-009-0042-9

Abstract: Accurate performance simulation and understanding of gas turbine engines is very useful for gas turbineTherefore, the simulated design point performance of an engine may be slightly different from its actualperformance.In this paper, two nonlinear gas turbine design-point performance adaptation approaches have been presentedto best estimate the unknown component parameters and match available design point engine performance

Keywords： gas turbine     engine     performance adaptation     performance matching     design-point performance simulation     influencecoefficient matrix     genetic algorithm    

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Performance evaluation of coordinated management of construction projects

Guo Feng,Liu Hui

Strategic Study of CAE 2011, Volume 13, Issue 8,   Pages 97-102

Abstract:

The combination of both function coefficient method and logframe approachwas employed to construct the performance evaluation index system of coordinated management of constructionIn addition, the way was given to calculate the comprehensive performance evaluation coefficient of coordinatedmanagement of construction projects, quantifying the evaluation of the performance of the coordinatedIn the end, the method to construct index system and calculate the coefficient was proved by an empirical

Keywords： coordinated management of construction projects     performance evaluation index system     function coefficient    

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Integration of renewable energies, flexible loads and storages into the German power grid: Actual situation

Harald SCHWARZ, Xiaoshu CAI

Frontiers in Energy 2017, Volume 11, Issue 2,   Pages 107-118 doi: 10.1007/s11708-017-0470-x

Abstract: Starting from the late 1990’s, the German government decided to change the national electric power supply system dramatically. The main stimulating instrument was the German Law on Renewable Energies (Erneuerbare Energien Gesetz (EEG)), which guaranteed a fixed feed-in tariff to everyone who was willing to invest into renewable generation. Based on the year of commissioning, defined revenues per kWh were fixed for the next 20 years. Due to a very attractive over-funding, more than 1.5 million renewable generation units were connected to the German grid up to the end of 2015. According to the EEG, renewable generation units can feed to the grid wherever they are located and whenever they are able to produce. The old physical principle was and is still neglected, which clearly stated that generation always has to follow the demand—simply due to the limited availability of storages in the power system. Only in cases, when temporarily renewable overproduction exceeds the tolerable loading of lines or transformers respectively endangers the system stability in total, are German grid operators allowed to announce curtailments by emergency measures. Even in such cases, the “not produced energy” from renewable sources has to be funded. Although the installed capacity from renewables is much higher than the peak load in Germany, it contributes only about 32% to German average annual energy. Unfortunately, the regional distribution of renewable generation and load is very different, e.g. in the northeast of Germany, this Renewable Energy (RE)-ratio meanwhile exceeds 100% due to the high RE-penetration and low load. High transits of renewable overproduction from the north to the south will be necessary at nearly every day per year. Therefore, a tremendous change is needed within the German power grid. This paper will give a first overview followed by several others, describing possible solutions on how to overcome this critical situation.

Keywords： grid integration     renewable energies     system stability     storages     flexible loads     new market design    

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Impact of renewable energies on the operation and economic situation of coal fired power stations: Actual

Hans-Joachim KRAUTZ, Alexander LISK, Joachim POSSELT, Christian KATZER

Frontiers in Energy 2017, Volume 11, Issue 2,   Pages 119-125 doi: 10.1007/s11708-017-0468-4

Abstract: Due to the fluctuating character of the renewable energy sources the demand of conventional power plants for flexibility is increasing. In the recent years, in Germany there has been a fast rise of production capacity of renewable energies, especially from wind turbines, photovoltaic installations, and biomass plants. The installed nominal power of wind turbines is actually (December 2016) 42 GW and of photovoltaic installations 40?GW. The renewable electric energy production in Germany is about 190?TWh/a, which represents a share of 33% of the yearly demand. The increased need for flexibility affects both the power gradients as well as the minimum load of conventional power plants. Due to this flexibility behaviour, conventional power plants are faced with problems concerning the durability of power plant components, corrosion, more maintenance effort and consequently the overall life expectancy. Another consequence of the increasing share of renewable energies is the decreasing full load operating hours, especially of coal fired and gas power plants. Along with decreasing revenues from the energy exchange market, coal fired power plants are faced with new economically challenges.

Keywords： flexible load operation     minimal load     power gradients     power plant maintenance     corrosion     life expectancy    

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Experimental study on performance of passive and active solar stills in Indian coastal climatic condition

R. LALITHA NARAYANA, V. RAMACHANDRA RAJU

Frontiers in Energy 2020, Volume 14, Issue 1,   Pages 105-113 doi: 10.1007/s11708-018-0536-4

Abstract: This present work is aimed to examine the effect of mass flow rate on distillate output and performanceobserved that the capacity of heat storage and heat drop are significant parameters that affect the still performanceinternal heat transfer coefficients with the mass flow rate have a significant effect on the yield and performance

Keywords： distillation efficiency     solar still     heat transfer coefficient     water depth     optimum and mass flow rate    

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Comprehensive performance analysis and optimization of 1,3-dimethylimidazolylium dimethylphosphate-water

Gorakshnath TAKALKAR, Ahmad K. SLEITI

Frontiers in Energy 2022, Volume 16, Issue 3,   Pages 521-535 doi: 10.1007/s11708-021-0720-9

Abstract: The performance validation of the ARS cycle showed a better coefficient of performance (COP) of 0.834

Keywords： ionic liquid driven absorption cycle     H2O-[mmim][DMP]     coefficient of performance (COP)     exergy    

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Theoretical analysis and actual experimental research on static characteristics of suspendome structure

CHEN Zhihua, YAN Xiangyu, SUN Ruirui, FENG Zhenchang, QIN Yali, ZHAO Jianbo

Frontiers of Structural and Civil Engineering 2007, Volume 1, Issue 3,   Pages 286-292 doi: 10.1007/s11709-007-0037-8

Abstract: The suspendome used as the roof of the VIP hall in Tianjin Museum was analyzed by ANASYS under the assumptions of hinged joints and rigid joints in up chord, respectively, and the results show that the member force and nodal displacement under the two assumptions have little difference. Thus, it is attained that the suspendome can be analyzed with the assumption of hinged joints. A full-scale test on the suspendome with half-cable and half-pipe was carried out. The loading system, arrangement of measuring points, and the test procedures are introduced. Also, a test on steel wire ropes for elastic module was carried out. The experimental and theoretical values of member forces and nodal displacements were compared and it showed that they accord well with each other under low-level load. While under high-level load, the experimental value was bigger than the theoretical value due to the influence of the test environment. With the increase of the load, tension of outside cables and looseness of inside cables occurred, which indicated that the prestressing value in inside cables should be properly assigned. Both the experimental and theoretical results verify that the suspendome has a wide application prospect with the advantages of perfect mechanical characteristics, low steel consumption, convenient construction and low cost.

Keywords： Tianjin     influence     displacement     high-level     low-level    

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Model design of static experiment for the middle tower of multispan suspension bridge based on actual

Ji Lin,Wang Tao and Wu Hanliang

Strategic Study of CAE 2012, Volume 14, Issue 5,   Pages 66-70

Abstract: In this paper, a small-scale model was designed for the middle tower of Taizhou Bridge, based on its actual

Keywords： suspension bridge     middle tower     actual working conditions     similarity theory     numerical simulation     model    

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RETRACTED ARTICLE: Momentum exchange coefficient for two jet flows mixing in a tee junction

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 12,   Pages 2161-2161 doi: 10.1007/s11705-009-0143-3

Abstract: RETRACTED ARTICLE: Momentum exchange coefficient for two jet flows mixing in a tee junction

Keywords： tee junction     Momentum exchange coefficient     RETRACTED    

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Experimental study of heat transfer coefficient with rectangular baffle fin of solar air heater

Foued CHABANE,Nesrine HATRAF,Noureddine MOUMMI

Frontiers in Energy 2014, Volume 8, Issue 2,   Pages 160-172 doi: 10.1007/s11708-014-0321-y

Abstract: The heat transfer coefficient between the absorber plate and air can be considerably increased by using

Keywords： Nusselt number     flow rate     heat transfer     heat transfer coefficient     thermal efficiency     forced convection    

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A photolysis coefficient for characterizing the response of aqueous constituents to photolysis

David R. HOKANSON,Ke LI,R. Rhodes TRUSSELL

Frontiers of Environmental Science & Engineering 2016, Volume 10, Issue 3,   Pages 428-437 doi: 10.1007/s11783-015-0780-3

Abstract: Quantum yield ( ) and molar absorption coefficient ( ) are the two critical parameters measuring theIt was shown that this product, named the photolysis coefficient, , can be determined using standardThe development showed the photolysis coefficient to be equally useful for microbiological, inorganicValues of calculated by the authors based on quantum yield and molar absorption coefficient data from

Keywords： UV photolysis     disinfection     advanced oxidation     N-nitrosodimethylamine     quantum yield     absorption coefficient    

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Hyperbranched magnetic polymer: highly efficient removal of Cr(VI) and application in electroplating wastewater

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 10,   Pages 1568-1580 doi: 10.1007/s11705-023-2303-2

Abstract: For actual wastewater containing Cr(VI), the Cr(VI) concentration was reduced from 25.8 to 0.4 mg∙Lperformance of Cr(VI) on TTCA/THT@Fe3O4 wasThe synergistic effect of adsorption and reduction enhances the adsorption performance of TTCA/THT@FeThe resultant polymer has a simple preparation process, excellent adsorption performance, easy magneticseparation, and promising application for actual wastewater.

Keywords： magnetic polymer     chromium removal     hydrogen bonding     recyclability     actual wastewater    

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Title Author Date Type Operation

Evaluation of the performance of a centralized ground-water heat pump system in cold climate region

Shilei LU,Zhe CAI,Li ZHANG,Yiran LI

Journal Article

Compressor performance of two-stage turbocharging system

HE Yituan, MA Chaochen, WEI Mingshan, ZHU Zhifu, HE Yituan

Journal Article

Performance of rolling piston type rotary compressor using fullerenes (C70) and NiFe

Ruixiang WANG,Yihao ZHANG,Yi LIAO

Journal Article

Nonlinear design-point performance adaptation approaches and their comparisons for gas turbine applications

Y. G. LI, P. PILIDIS,

Journal Article

Performance evaluation of coordinated management of construction projects

Guo Feng,Liu Hui

Journal Article

Integration of renewable energies, flexible loads and storages into the German power grid: Actual situation

Harald SCHWARZ, Xiaoshu CAI

Journal Article

Impact of renewable energies on the operation and economic situation of coal fired power stations: Actual

Hans-Joachim KRAUTZ, Alexander LISK, Joachim POSSELT, Christian KATZER

Journal Article

Experimental study on performance of passive and active solar stills in Indian coastal climatic condition

R. LALITHA NARAYANA, V. RAMACHANDRA RAJU

Journal Article

Comprehensive performance analysis and optimization of 1,3-dimethylimidazolylium dimethylphosphate-water

Gorakshnath TAKALKAR, Ahmad K. SLEITI

Journal Article

Theoretical analysis and actual experimental research on static characteristics of suspendome structure

CHEN Zhihua, YAN Xiangyu, SUN Ruirui, FENG Zhenchang, QIN Yali, ZHAO Jianbo

Journal Article

Model design of static experiment for the middle tower of multispan suspension bridge based on actual

Ji Lin,Wang Tao and Wu Hanliang

Journal Article

RETRACTED ARTICLE: Momentum exchange coefficient for two jet flows mixing in a tee junction

Journal Article

Experimental study of heat transfer coefficient with rectangular baffle fin of solar air heater

Foued CHABANE,Nesrine HATRAF,Noureddine MOUMMI

Journal Article

A photolysis coefficient for characterizing the response of aqueous constituents to photolysis

David R. HOKANSON,Ke LI,R. Rhodes TRUSSELL

Journal Article

Hyperbranched magnetic polymer: highly efficient removal of Cr(VI) and application in electroplating wastewater

Journal Article