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  • JC/T 915-2003热弯玻璃Heat bent glass

    本标准规定了热弯玻璃的分类、规格、技术要求、试验方法、检验规则及标志、包装、运输和贮存。<br>本标准适用于建筑用热弯玻璃和建筑以外用热弯玻璃。不适用于热弯钢化玻璃和热弯半钢化玻璃。...

    2022-06-13 15:44:03浏览:5 heatglass玻璃

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  • GB/T 40677-2021微型导热管Miniature heat pipe

    GB/T 40677-2021微型导热管Miniature heat pipe...

    2022-03-14 21:40:31浏览:7 Miniature热管heat

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  • An experimental study on heat transfer process of multiple mist impinging jets

    Mist jet impingement cooling is an enhanced heat transfer method widely used after the continuous galvanizing process.The key of a successful design and operation of the mist jet impingement cooling system lies in mastering heat transfer coefficients.The heat transfer coefficients of high temperature steel plates cooled with multiple mist impinging jets were experimentally investigated,and the effects of gas and water flow rates on heat transfer coefficients were studied.The test results illustrate that the gas flow rate has little effect on the mist heat transfer rate.It is also found that the water flow rate has a great impact on the heat transfer coefficient.When the water flow rate ranges from 0.96m3/h to 1.59 m3/h,an increase in the rate will produce a higher heat transfer coefficient with a maximum of 5650 W/( m2 · K).Compared with the conventional gas jet cooling,the heat transfer coefficient of the mist jet cooling will be much higher,which can effectively strengthen the after-pot cooling....

    2020-11-22 17:58:37浏览:24 multiplemistjetimpingementheattransferafter-potcooling

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  • Formation of integral fins function-surface by extrusion-ploughing process

    An extrusion-ploughing process was presented to fabricate the integral fin function-surface. Cutting edge inclination angle and rake angle can be calculated from the tool's geometry relationship. The description of fins' geometry characters was standardized. The experiments show that, when the middle cutting edge's inclination angle η is less than 35-, continuous fin will come out; when η is between 35- and 55-, the fins will be saw-tooth ones, and the fins will be torn when this angle is above 55-; when the extrusion angle θ is between 60- and 150-, the fins will appear, or else, the fins will be torn into chips from the base. Forming angle and clearance angle have little effect on fin's formation. For continuous fin, its height is close to cutting depth when it is small, but it will become approximately constant as cutting depth grows; for saw-tooth fins, the width, the height, as well as the clearance will increase with the increase of cutting depth, but the increment of clearance is small; neither for continuous fin, nor for saw-tooth ones, cutting velocity has little influence on their structure parameters....

    2020-11-22 17:58:37浏览:21 finsintegralextrusion-ploughingformationheatfunctionsurface

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  • Application of “soft canning” heat preservation technique in the superalloy forging process

    The “soft canning” heat preservation technique is invented by Baoshan Iron & Steel Co.,Ltd.(Hereafter referred to Baosteel),using the flexible insulation material which can be stuck on the surface of the heated ingot or billet in the superalloy thermal process.This adhesive insulation material can reduce the temperature drop of the ingot or billet during the transferring or hot working process,and can deform with the billet without dropping.The surface temperature drop can be effectively reduced,so the products can be obtained a good surface quality and the structural uniformity can be improved.The technique is applied to hard-wrought superalloy forging of cogging,superalloy rods finished forging fire and superalloy hot die forging processing,and good results have been achieved....

    2020-11-11 22:33:38浏览:38 softcanningsuperalloyheatpreservationforging

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  • Comparisons between different models for thermal simulation of GTAW process

    Two mathematical models are built to study the effects of the fluid flow on thermal distributions of the gas tungsten arc welding(GTAW) process. One model is based on the heat conductivity equation, which doesn' t take the effects of the fluid flow into account, and the other couples the laminar heat transfer and fluid flow in the weld pool, which is called laminar fluid flow model in short. The simulated results of the two models show that the pattern and velocity of the fluid flow play a critical role in determining the thermal distribution and the weld pool shape. For the laminar fluid flow model, its highest temperature is 400 K lower than that calculated with the other model and the depth of its weld pool is shallower too, which is mainly caused by the main vortex of the flow in the weld pool....

    2020-11-11 22:33:38浏览:36 thermaldistributiongastungstenarcweldingheattransferandfluidflow

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  • Dynamic Model and Performance of Absorption Heat Pump in Shut-down Process

    The dynamic model of LiBr absorption heat pump in shut-down process is established. The simulation results show good agreement with the experiments. The dynamic performance of high-pressure generator, low-pressure generator and heat exchanger are analyzed in detail. The proper shut-down mode of the heat pump is presented,which, in consideration of solution parameters, has a great effect on the possibility of crystallization of some components....

    2020-11-11 22:33:38浏览:27 absorptionheatpumpshut-downprocess

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  • Numerical Simulations of the Physical Process for Hailstone Growth

    Theoretical and experimental studies show that during hail growth the heat and mass transfers play a determinant role in growth rates and different structures. However, many numerical model researchers made extrapolation of the key heat transfer coefficient of the thermal balance expression from measurements of evaporating water droplets obtained under small Renolds numbers (Re ≤ 200) introduced by Ranz and Marshall, leading to great difference from reality. This paper is devoted to the parameterization of measured heat transfer coefficients under Renolds numbers related to actual hail scales proposed by Zheng, which are then applied, to Hu-He 1D and 3D models for hail growth respectively, indicating that the melting rate of a hailstone is 12%-50% bigger, the evaporation rate is 10%-200% higher and the dry-wet growth rate is 10%-40% larger from the present simulations than from the prototype models....

    2020-11-10 09:33:08浏览:31 hailparameterizationnumericalsimulationheattransfer

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  • Performances of lithium manganese oxide prepared by hydrothermal process

    A simple hydrothermal process followed by heat treatment was applied to the preparation of spinel Li1.05Mn1.95O4. In this process, electrolytic manganese dioxide (EMD) and LiOH·H2O were used as starting materials. The physiochemical properties of the synthesized samples were investigated by thermogravimetry-differential scanning calorimetry (TG-DSC), X-ray diffractometry (XRD), and scanning electronic microscopy (SEM). The results show that the hydrothermally synthesized precursor is an essential amorphous. The precursor can be easily transferred to spinel powders with a homogeneous structure and a regularly-shaped morphology by heat treatment. Li1.05Mn1.95O4 powder obtained by heat treating the precursor at 430 °C for 12 h and then calcining at 800 °C for 12 h shows an excellent cycling performance with an initial charge capacity of 118.2 mA·h·g-1 obtained at 0.5C rate and 93.8%of its original value retained after 100 cycles....

    2020-11-10 09:33:08浏览:34 lithiumionbatteriesLiMn2O4hydrothermalmethodheattreatment

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  • Calculation of Solidification Process of Continuous Cast Bar

    In this paper, it presents the results of calculation of solidification process of copper continuous cast bar by cross section size 120 mm×70 mm with application of ProCast 2010 software. The estimation of mould design effect on solidification process of continuos copper cast bar is completed at various speeds of casting. Profiles of liquid metal cavities and temperature allocations in the cast bar at various casting speeds are defined. The analysis of received liquid metal cavity profiles shows that a new mold construction allows significantly decrease of the length of the liquid metal cavity during continuous copper casting at HAZELETT? casting machine and the increase of maximum casting speed from 10 to 11 m/min. Adequacy of the results of copper continuous cast bar solidification process calculation is confirmed by the experimental data....

    2020-11-10 09:33:08浏览:39 continuouscastingcopperCASTbarwatercoolingmoldliquidmetalcavityheat

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  • 针对甲醇泄漏对循环水系统的影响及处理措施

    某煤制烯烃项目循环水系统在生产运行过程中,由于化工装置甲醇物料介质泄漏至循环水系统中,循环水系统出现大量白色泡沫,浊度、CODcr、异养菌、总铁、生物粘泥量等水质指标超标,导致循环水水质迅速恶化。本文针对甲醇泄漏对循环水系统的影响进行剖析,采用投用非氧化杀菌剂、排水置换和加强监控等方法进行应急处理,保证了循环水系统的平稳运行。...

    2020-11-10 09:33:08浏览:55 换热器泄漏甲醇泡沫heatexchangerleakagemethanolfoam

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  • Experimental and Numerical Investigations of an Ice-slurry Generator

    A new test facility equipped with refrigerant and brine circulation systems, and a rotating-scraper ice-slurry generator was constructed to analyze the ice-slurry flow and heat transfer accompanied by phase change in an industrial generator. The axial and transverse brine temperature and ice fraction concentration profiles in the ice generator were measured. The heat transfer efficiency lower than the average was identified in the upper half of the ice generator and its cause was determined by conducting three-dimensional numerical simulation using a commercial CFD code, FLUENT. Approaches of improving the brine-side heat transfer rates were investigated by incorporating extra mixing blades from numerical simulation....

    2020-11-03 10:30:25浏览:20 icegeneratorice-slurrynumericalsimulationheattransfer

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  • 热泵技术

    热泵技术是近年来全世界倍受关注的新能源技术。热泵是一种能从自然界的空气、水或土壤中获取低品位热能,经过电力做功,提供可被人们所用的高品位热能的装置。该文从介绍热泵的定义入手,将热泵系统进行分类并分析其主要特点及应用场合,进而分析热泵系统的经济效益以及环保效益。...

    2020-10-26 22:14:25浏览:22 热泵系统经济分析节能heatpumpsystemeconomicAnalysisEnergysaving

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  • 城市污水厂污水污泥的热值测定分析方法研究

    建立热力学指标是污水生物处理过程热力学分析的基础工作,目前仍缺乏污水污泥化学能测试的标准方法.采用IKA C5000型自动热量计对某城市二级污水处理厂进水、出水、初沉污泥、剩余污泥、混合污泥和脱水污泥进行了热值测定,样品前处理采用103~105℃烘干获得干燥基,用苯甲酸进行加标回收.参照煤的发热量测定方法得到样品的高位热值.试验结果显示:出水干燥基的热值为0.5 kJ/g,进水干燥基的热值为4 kJ/g以上,各T艺段的污泥干燥基热值较高,基本都在12 kJ/g以上,接近右江褐煤水平.测定结果的标准偏差≤±0.452%,相对标准偏差≤4-0.136%.通过同一批样品的元素分析及Dulong公式理论推算,发现2种方法可得到相似的结果....

    2020-09-25 09:10:57浏览:24 污水污泥热值氧弹式量热计元素分析wastewatersludgeheatvaluebombcalorimeterelement

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  • 污水源热泵技术应用

    对国内外典型的污水源热泵系统工程进行了介绍,分析了污水源热泵系统的优缺点,并阐述了推广污水源热泵技术应遵循的四项原则,有利于该技术在我国的推广应用与不断发展。...

    2020-09-25 09:10:57浏览:18 污水源热泵城市污水冷热源低位热能sewage-sourceheatpumpurbanSewagecoldandsource

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  • 污水热泵在城市生活小区的应用

    从就近利用小区污水冷热能的角度出发,对重庆市主城区某居住小区生活污水的温度和流量进行了测试分析,提出了小区污水热泵系统应用于建筑空调、供暖和卫生热水供应的综合节能系统模式;调研了小区生化池内污水温度分布,分析了小区污水逐时流量及逐月流量的变化,讨论了小区污水所能提供的冷量与建筑实际需要冷负荷的匹配关系,提出了生活小区污水热泵系统与常规冷热供应系统的复合式冷热供应方案....

    2020-09-25 09:10:57浏览:23 建筑节能污水源热泵污水温度污水流量应用模式buildingenergysavingsewage-sourceheatpumpSewage

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  • Explicit analytical wave solutions of unsteady 1D ideal gas flow with friction and heat transfer

    Several families of algebraically explicit analytical wavesolutions are derived for the unsteady 1D ideal gas flow with friction and heat-transfer, which include one family of travelling wave solutions, three families of standing wave solutions and one standing wave solution. \{Among\} them, the former four solution families contain arbitrary functions, so actually there are infinite analytical wave solutions having been derived. Besides their very important theoretical meaning, such analytical wave solutions can guide the development of some new equipment, and can be the benchmark solutions to promote the development of computational fluid dynamics. For example, we can use them to check the accuracy, convergence and effectiveness of various numerical computational methods and to improve the numerical computation skills such as differential schemes, grid generation ways and so on....

    2020-09-15 12:28:59浏览:12 explicitanalyticalsolutiontravellingwavestandingfrictionheat

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  • Effect of particle loading on heat transfer enhancement in a gas-solid suspension cross flow

    Heat transfer between gas-solid multiphase flow and tubes occurs in m a ny industry processes, such as circulating fluidized bed process, pneumatic conv eying process, chemical process, drying process, etc. This paper focuses on the influence of the presence of particles on the heat transfer between a tube and g as-solid suspension. The presence of particles causes positive enhancement of h e at transfer in the case of high solid loading ratio, but heat transfer reduction has been found for in the case of very low solid loading ratio (Ms of les s than 0.05 kg/kg). A useful correlation incorporating solid loading ratio, particle s ize and flow Reynolds number was derived from experimental data. In addition, th e k-ε two-equation model and the Fluctuation-Spectrum- Random-Trajecto ry Model ( FSRT Model) are used to simulate the flow field and heat transfer of the gas-ph a se and the solid-phase, respectively. Through coupling of the two phases the mo d el can predict the local and total heat transfer characteristics of tube in gas - solid cross flow. For the total heat transfer enhancement due to particles loadi ng the model predictions agreed well with experimental data....

    2020-09-15 12:28:59浏览:34 multiphaseflowheattransferparticleloading

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  • Heat calculation and numerical simulation in steam mining of permafrost gas hydrate

    Steam mining method was injecting hot steam into the borehole to heat the hydrate strata at the same time of depressurization mining,which could promote further decomposition and expand mining areas of gas hydrate.Steam heat calculation would providc the basis for the design of heating device and the choice of the field test parameters.There were piping heat loss in the process of mining.The heat transfer of steam flowing in the pipe was steady,so the heat loss could be obtained easily by formula calculation.The power of stratum heating should be determined by numerical simulation for the process of heating was dynamic and the equations were usually nonlinear.The selected mining conditions were 500-millimeter mining radius,10 centigrade mining temperature and 180 centigrade steam temperature.Heat loss and best heating power,obtained by fomula calculation and numerical simulation,were 21.35 W/m and 20 kW....

    2020-09-15 12:28:59浏览:28 gashydratessteamminingheatlossnumericalsimulationbestpower

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  • Electricity Pricing for Natural Gas CHP Projects

    Regarding the state's policy that gtves a higher on-grid electricity price to natural gas CHP (combined heat and power) projects,this paper studies the effect of it on the operation of those projects by theoretical analysis and a case study,It concludes thar on-grid electricity price on the high side,compared to heat price,will lead power plants to produce more electricity but less heat,thus catusing decrease of the plants ' thermal efficiency and harm to energy saving of the whole society....

    2020-09-13 23:35:02浏览:30 combinedheatandpower(CHP)naturalgasgenerationon-gridelectricity

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  • Simulation of rarefied gas flow and heat transfer in microchannels

    Analysis and simulation of rarefied nitrogen gas flow and heat transfer were performed with the Knusden number ranging from 0.05 to 1.0, using the direct simulation of Monte Carlo (DSMC) method. The influences of the Kn number and the aspect ratio on the gas temperature and wall heat flux in the microchannels were studied parametrically. The total and local heat fluxes of the microchannel walls varying with the channel inlet velocities were also investigated in detail. It was found that the Kn number and the aspect ratio greatly influence the heat transfer performance of microchannels, and both the channel inlet and outlet have higher heat fluxes while the heat flux in the middle part of channels is very low. It is also found that the inlet free stream flow velocity has small affect on the wall total heat flux while it changes the distribution of local heat flux....

    2020-09-13 23:35:02浏览:29 microchannelKnNumberDSMCfluidflowandheattransfer

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  • 余热发电项目热工检测分析

    对琉璃河水泥厂2500t/d新型干法水泥生产线余热发电前后进行了两次热工检测,从实际测定和理论上客观地分析了余热发电建设对水泥生产的影响,为新型干法水泥生产线如何在保证熟料烧成系统稳定运行的情况下,充分利用烧成系统产生的废气余热来进行余热发电提供了很好的参考依据....

    2020-09-03 16:42:35浏览:25 新型干法热工检测余热发电NSPthermalconditioncalibrationwasteheatpowergeneration

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  • 排风隔热窗的热工性能分析

    研究一种新型的建筑外窗结构———排风隔热窗,其由3层普通白玻璃、内置的遮阳百叶及玻璃之间的气流空腔构成。排风隔热窗是将室内空调排风通过玻璃间的气流空腔排到室外,利用空调排风低品位的冷量/热量减少外窗在供冷/供热季时形成的空调负荷,达到排风热回收的效果,同时它可以根据供冷/供热季的不同切换其排风通道。通过建立传热数学模型,对该结构和2种常规外窗结构在典型夏热冬冷气候条件下的节能效果进行分析比较。结果表明,排风隔热窗可以有效地降低室内侧玻璃表面与室内空气之间的温差,减少外窗形成的室内负荷,改善室内的热舒适性。...

    2020-09-02 20:01:33浏览:23 排风隔热窗排风热回收建筑节能热舒适性exhaustairinsulationwindowheatrecovery

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  • 热响应测试实例及问题分析

    地埋管地源热泵系统开发利用前景广阔,本文尝试采用基于圆柱热源理论的柱模型,在天津市静海县团泊新城,为某竖直地埋管建设项目设计了2组取热和2组排热工况热响应测试试验,为地源热泵系统优化设计与节能运行,提供了必要的数据依据。同时我们还总结了热响应测试过程中应该注意的问题,为以后工作提供了建议。...

    2020-09-02 20:01:33浏览:13 地源热泵圆柱热源理论热响应试验groundsourceheatpumpcylindricaltheorythermal

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  • 拉丝炉的热工分析

    分析了拉丝炉体各部位的传热数据,介绍了各部位的传热情况和热量计算方法。建议选择合适的炉体结构和保温材料,以降低其表面温度和拉丝炉外表面积来减少拉丝炉的热损耗;拉丝炉加球孔的传热和冷却水带走的热量也可以采用合理的技术方案实现有效利用。...

    2020-09-02 20:01:33浏览:37 拉丝炉热效率传热fiberdrawingcrucibleheatefficiencytransfer

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