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Ventilated Double Skin Facades in Hot-Summer and Cold-Winter Zones in china

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湖南大学学报（自然科学版） 2009年第S1期36卷 160-162页

作者： ZHOU Juan,CHEN You-ming,FANG Shan-shan(College of Civil Engineering,Hunan University,Changsha,Hunan 410082,china key laboratory of building safety and energy efficiency,moe,china) College of Civil Engineering Hunan University Changsha 410082 China key laboratory of building safety and energy efficiency China

Double-skin facades(DSF)are a technique developed for colder climates,so few people think about whether or not it can also be used for hot-summer and cold-winter zones in *** analyzing the problems of using DSF for hot-summer zones,this paper explored on the possibility of applying DSF in hot-summer and cold-winter zones in *** main existing research methods for DSF were also collected and *** properly managed,the ventilated DSF with controlled shading devices can be used even in hot summer in china.

关键词： possibility double-skin facades hot-summer and cold-winter zones simulation method

Formula Revision of Natural Ventilation Driven by Hot Pressure in Single Large Window Opening

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湖南大学学报（自然科学版） 2009年第S1期36卷 26-29页

作者： LIN Wen,ZHANG Quan,HOU Xi-kuai,LI Ping,ZHOU Jun-li,ZHANG Guo-qiang(key laboratory of building safety and energy efficiency(moe),College of Civil Engineering,Hunan University,Changsha,Hunan 410082,china) key laboratory of building safety and energy efficiency College of Civil Engineering Hunan University Changsha 410082 China

This paper investigated the natural ventilation driven by hot pressure on a typical office building with single window *** actual result indicates that the ventilation rate of natural ventilation driven by hot pressure in the actual single window opening construction is very different from that obtained by the theoretical formula,since the ventilation conditions between actual environment and ventilation driven by hot pressure in the single window opening are ***,the theoretical formula is amended,and it becomes more consistent with the actual ventilation rate of natural ventilation driven by hot pressure under conditions that the construction is in the form of single window opening.

关键词： single opening natural ventilation theoretical formula

Research and development on transonic compressor of high pressure ratio turbocharger for vehicle internal combustion engines

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Science china(Technological Sciences) 2010年第7期53卷 1817-1823页

作者： ZHENG XinQian, ZHANG YangJun & YANG MingYang State key laboratory of Automotive safety and energy, Tsinghua University, Beijing 100084, china 1. State key laboratory of Automotive safety and energy Tsinghua University Beijing 100084 China

The pressure ratio required for a turbocharger centrifugal compressor increases with internal combustion engine power density. High pressure ratio causes a transonic flow field at the impeller inducer. Transonic flow narrows the stable flow range and de-teriorates stage efficiency. In this work, an advanced high pressure ratio transonic compressor was designed. The experimental results show that the maximum pressure ratio of this turbocharger is about 4.2, the maximum efficiency is above 80% and the stable flow range at the designed rotating speed is up to 34%. A turbocharger with this transonic compressor has been applied to some vehicle research actually, and improved power density by 40%.

关键词： turbocharger internal combustion (IC) engine compressor high pressure ratio transonic

Modeling of Air Temperature for Heat Exchange due to Vertical Turbulence and Horizontal Air Flow

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湖南大学学报（自然科学版） 2009年第S1期36卷 45-50页

作者： ZHANG Lei,MENG Qing-lin(State key laboratory of Subtropical building Science,South china University of Technology,Guangzhou,Guangdong 510640,china) State key laboratory of Subtropical building Science South China University of Technology Guangzhou 510640 China

In order to calculate the air temperature of the near surface layer in urban environment,the surface layer air was divided into several layers in the vertical direction,and some energy balance equations were developed for each air layer,in which the heat exchange due to vertical turbulence and horizontal air flow was taken into ***,the vertical temperature distribution of the surface layer air was obtained through the coupled calculation using the energy balance equations of underlying surfaces and building ***,the measured air temperatures in a small area(with a horizontal scale of less than 500 m)and a large area(with a horizontal scale of more than 1 000 m)in Guangzhou in summer were used to validate the proposed *** calculated results agree well with the measured ones,with a maximum relative error of 4.18%.It is thus concluded that the proposed model is a high-accuracy method to theoretically analyze the urban heat island and the thermal environment.

关键词： turbulent heat exchange urban thermal environment near surface layer air temperature calculation model

Experimental study on CCl_4/CH)4/O_2/N_2 oxidation

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Science china(Technological Sciences) 2010年第4期53卷 1016-1022页

作者： WANG Bo1,2,CHI Yong2,YAN JianHua2 & NI MingJiang2 1 College of energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,china 2 State key laboratory of Clean energy Utilization,Zhejiang University,Hangzhou 310027,china 1. College of energy and Power Engineering University of Shanghai for Science and Technology Shanghai 200093 China2. State Key Laboratory of Clean Energy Utilization Zhejiang University Hangzhou 310027 China

Oxidation within the system CCl4/CH4/O2/N2 is studied at atmospheric pressure in a tubular flow reactor to investigate the influence of reaction temperature and chlorine content on chlorinated waste combustion and find incineration process optimization methods for pollution *** reaction temperature varies from 700℃ to 1000℃ and the CCl4/CH4(or Cl/H) mole ratio of the inlet mixture varies from 0.21 to *** profiles are measured with *** is shown that at the same initial CCl4 concentration and reaction temperature adding CH4 favors CCl4 destruction and CO2 *** the destruction and removal efficiency(DRE) of CH4 decreases with lower Cl/H and higher concentrations of toxic products of incomplete combustion such as COCl2 and CH3Cl are formed at the same *** chlorine in the system favors CH4 decomposition,but it also inhibits further oxidation of *** temperature assists in both CCl4 destruction and CH4 conversion,and the concentration of toxic combustion intermediates is *** the temperature is the most effective way to enhance CCl4 *** CO2 concentration increases with temperature.A CO concentration peak is observed around 800℃:with a certain Cl/H,the CO concentration first increases with temperature and then *** effect of increasing CH4 concentration on CCl4 destruction becomes mild above 900℃.Rather,it enhances the interaction between chlorine and carbonaceous radicals,which leads to higher concentration of toxic products.

关键词： hazardous waste destruction and removal efficiency(DRE) oxidation carbon tetrachloride chlorinated compounds methane

Measurement Methodology for Monitoring Fouling Resistance in Condenser of Chiller

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湖南大学学报（自然科学版） 2009年第S1期36卷 119-122页

作者： YU Dan1,3,GAN Li-si1,CAO Yong2(1.Beijing University of Technology,Beijing 100022,china 2.Build Environment and energy efficiency,china Academy of building Research,Beijing 100013,china 3.Beijing Institute of Civil Engineering and Architecture,Beijing 100044,china) Beijing University of Technology Beijing 100022 China Build Environment and energy efficiency China Academy of Building Research Beijing 100013 China Beijing Institute of Civil Engineering and Architecture Beijing 100044 China

This paper established an on-line monitoring model for fouling resistance of cooling water based on heat transfer theory,which was mainly applied to the fouling resistance test for condenser of chiller in operation,and the test requirements were *** proves that the load ratio of chiller has big influence on the test result,and the best load ratio for test is the range of 80%～100%.A case has been executed to validate the model's feasibility.

关键词： fouling resistance monitoring condenser cooling water

Operation Performance of Central Solar Heating System with Seasonal Storage Water Tank in Harbin

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湖南大学学报（自然科学版） 2009年第S1期36卷 111-114页

作者： YE Ling1,JIANG Yi-qiang1,YAO Yang1,ZHANG Shi-cong2(1.Institute of Heat Pump and Air Conditioning Technology,Harbin Institute of Technology,Harbin,Heilongjiang 150090,china 2.Institute of Built Environment and energy efficiency,china Academy of building Research,Beijing 100013,china) Institute of Heat Pump and Air Conditioning Technology Harbin Institute of Technology Harbin 150090 China Institute of Built Environment and energy efficiency China Academy of Building Research Beijing 100013 China

This paper presented a preliminary research on the central solar heating system with seasonal storage(CSHSSS)used in cold climate in china.A mathematical model of the solar energy seasonal storage water tank used in the central solar heating system was firstly developed based on energy *** was followed by the simulation of the CSHSSS used in a two-floor villa in Harbin,and analysis of the impacts on storage water temperature of tank volume,solar collector area,tank burial depth,insulation thickness around the tank,*** results show there is a relatively economical tank volume to optimize the system efficiency,which decreases with increasing tank volume at the constant collector area,and increases with increasing collector area at the constant tank ***,the insulation thickness has obvious effect on avoiding heat loss,while the tank burial depth doesn'*** addition,the relationship between the solar collector efficiency and storage water temperature is also obtained,it decreases quickly with increasing storing water temperature,and then increases slowly after starting space heating *** may be helpful for relevant design and optimization in cold climates in china and all over the world.

关键词： central solar heating system with seasonal storage(CSHSSS) simulation system efficiency storage water tank villa

Sediment transport capacity of hyperconcentrated flow

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Science china(Physics,Mechanics & Astronomy) 2008年第8期51卷 961-975页

作者： SHU AnPing1,2 & FEI XiangJun2 1 School of Environment & key laboratory of Water and Sediment Sciences,Ministry of Education,Beijing Normal University,Beijing 100875,china 2 State key laboratory of Hydroscience and Engineering,Tsinghua University,Beijing 100084,china School of Environment & key laboratory of Water and Sediment Sciences Ministry of Education Beijing Normal University Beijing 100875 China State key laboratory of Hydroscience and Engineering Tsinghua University Beijing 100084 China

As one of the most important components of river mechanics,sediment transport capacity of sediment-laden flows has attracted much attention from many researchers working on river mechanics and hydraulic engineering. Based on the time-averaged equation for a turbulent energy equilibrium in solid and liquid two-phase flow,an expression for the efficiency coefficient of suspended load movement was derived for the two-dimensional,steady,uniform,fully-developed turbulent flow. A new structural expression of sediment transport capacity was achieved. Using 115 runs of flume experimental data,which were obtained through two kinds of sediment transport experiments in the state of equilibrium,in combination with the basic rheological and sediment transporting characteristics of hyperconcentrated flow,the main parameters in the structural expression of sediment transport capacity were calibrated,and a new formula of sediment transport capacity for hyperconcentrated flow was developed. A large amount of field data from the Yellow River,Wuding River,and Yangtze River,etc. were adopted to verify the new formula and good agreement was obtained. These results above contribute to an improved theoretical system of river mechanics and a reliable tool for management of rivers carrying high concentration of sediments.

关键词： hyperconcentrated flow turbulent energy equilibrium efficiency coefficient sediment transport capacity

Exploration of combined adjustment laws about IGV,stator and rotational speed in off-design conditions in an axial compressor

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Science china(Technological Sciences) 2010年第4期53卷 969-975页

作者： HU YanMing1,2 & NIE ChaoQun1 1 key laboratory of Advanced energy and Power Technology,Institute of Engineeting Thermophysics,Chinese Academy of Science,Beijing 100190,china 2 Graduate School of Chinese Academy of Sciences,Beijing 100190,china 1. key laboratory of Advanced energy and Power Technology Institute of Engineeting Thermophysics Chinese Academy of Science Beijing 100190 China2. Graduate School of Chinese Academy of Sciences Beijing 100190 China

Experimental investigations are performed in a three-stage low-speed axial compressor with variable inlet guide vanes(IGV) and adjustable *** characteristics of the compressor,especially the efficiency and stall margin,are analyzed in design and off-design operation conditions by adjusting stagger angles of IGV and stators as well as changing the rotational *** experimental results show that the off-design performance of the multistage axial compressor is improved by restaggering of IGV and stators related to rotational *** the background of engineering applications,digital signal processing(DSP) technique is used to realize online adjustment of stagger angles according to the corresponding relations between incidence angles of rotor and rotational speed.

关键词： axial compressor IGV surge DSP techniques off-design