共查询到20条相似文献,搜索用时 380 毫秒
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低辐射镀膜玻璃的节能原理及应用 总被引:3,自引:0,他引:3
低辐射镀膜玻璃是一种新型环保节能玻璃,本文介绍了低辐射镀膜玻璃的节能原理和应用范围,指出其在应用中应注意的若干问题,提出应高度重视该产品的开发、生产、理论研究和相关标准的制定,大力推广使用低辐射镀膜玻璃,促进我国节能事业的发展。 相似文献
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本文应用模糊集理论,提出了一种评估内燃机性能优劣的定量描述方法,在内燃机产品开发与改进时,为评估其技术性能水平提供依据。示例计算表明该方法是可行的。 相似文献
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本文在国内外VVT技术的基础上,以嘉陵JH125摩托车发动机为研究对象,研制了一种可变配气机构,通过对这套机构进行试验研究、机构的优化设计,实现了VVT技术在摩托车发动机上的应用。 相似文献
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对水煤浆的应用现状进行回顾性综述。介绍国内废液水煤浆的研究概况、水煤浆技术用于处理淮化有机废液的研究,并对废液水煤浆的市场应用前景进行分析,认为废液水煤浆实现了废液的资源化利用,最后对应用废液水煤浆技术可能出现的问题进行了探讨。 相似文献
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热回收蓄能空调系统的应用研究 总被引:7,自引:0,他引:7
本文重点阐述了热回收技术和蓄能技术在空调系统中的应用,在工作原理、节能循环分析、经济性分析、控制和应用注意事项等多方面进行了初步研究,研究结果表明该节能技术在制冷空调系统中的运用大有前途,可以得到大力的推广。 相似文献
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Shu Zheng Zixue Luo Xiangyu Zhang Huaichun Zhou 《International Journal of Thermal Sciences》2011,50(12):2496-2505
In this paper, a distributed parameter model for the evaporation system of a subcritical once-through, coal-fired, twin-furnace boiler based on 3-D temperature field reconstruction is developed. The imaginary wall surface was put forward to simplify the twin-furnace problem. The mathematical model was formulated for predicting the transient distributions of parameters, such as the heat flux, the metal-surface temperature and the steam quality; while considering the non-uniform distributions of the surface heat transfer coefficient and frictional resistance coefficient. The model was based on the 3-D temperature distribution got by a flame image processing technique. The model was validated by some measurable parameters of the evaporation system at three typical loads. The results show that the heat flux and the temperature which are located at the overlapping region of the two tangential flames are higher than those in other corners. This distributed parameter model on evaporation system reflects the in-situ operating status of the power plant boiler, which may lead to the subsequent research on a supercritical boiler. 相似文献
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在文献综述的基础上,分析了EHD强化传热中,电场特性的重要性和研究现状,指出了当前研究中的不足之处及存在的矛盾,为在EHD强化传热研究中,进一步进行电场特性影响规律的试验和理论探讨提出了建议。 相似文献
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EHD强化传热研究中的重要问题一电场特性的影响规律 总被引:3,自引:0,他引:3
在文献综述的基础上,分析了EHD强化传热中,电场特性的重要性和研究
现状,指出了当前研究中的不足之处及存在的矛盾,为在EHD强化传热研究中,进
一步进行电场特性影响规律的试验和理论探索提出了建议。 相似文献
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K. Edalati B. RokrokA. Kermani M. SeiediA. Movafeghi M. Shahandeh 《International Journal of Pressure Vessels and Piping》2007
Radiographic image quality, which is quantified by radiographic sensitivity measurements, is significantly influenced by parameters such as scattering, effective attenuation coefficient and image contrast. In the present work, the Monte Carlo method has been utilized to simulate Gamma ray scattering and image contrast for double wall radiography of pipes and some experiments have been designed to determine the radiographic sensitivity and measure the effective attenuation coefficient. Wire type image quality indicators were simulated as artificial defects and the threshold contrast and minimum optical density difference for viewing each wire were investigated. It was found that the maximum allowable source to film distance for double wall exposure and single wall viewing technique was 1.4 times the outside diameter of the pipe and the image contrast and radiographic sensitivity were higher for this technique in comparison with the double wall viewing technique. The double wall exposure and double wall viewing technique is proposed to be used when the minimum source to film distance is higher than 1.4 times the outside diameter. 相似文献
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Because the parasitic load on most polymer electrolyte fuel cell systems is dominated by pressure losses across the flow fields, understanding the flow channel dynamics has garnered significant recent attention. The current work is aimed at enabling advanced design of reactant flow channels by elucidating the details of the velocity fields within various reactant flow channel geometries. Gas-phase measurement is critical to ensuring that the results are valid for real fuel cell systems, and for application of this technique to the study of flow channels with two-phase obstruction phenomena. In the current research, gas-phase velocity fields have been measured using particle image velocimetry (PIV) in representative geometries, including a straight channel (for technique validation) and a 180° switchback with channel-to-land ratio of 1:1. The accuracy of the measurement depends on the ability of the seed particles to follow the flow. Numerical simulations have been performed to develop a criterion for identifying appropriate seed particles. The research presented is a first step toward measuring velocity fields in novel flow reactant channels in operational cells. 相似文献
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《International Communications in Heat and Mass Transfer》1996,23(3):407-416
This work studies the transport phenomena in a nonsaturated flow of a newtonian fluid through a rigid porous matrix. A mixture theory approach is used in the modelling of the fluid flow and the heat, transfer problem. The mixture consists of three overlapping continuous constituents: a solid (porous medium), a liquid and an inert gas, assumed with zero mass density and thermal conductivity. A set of four nonlinear partial differential equations describes the problem which is approximated by means of a Glimm's scheme, combined with an operator splitting technique, for the hyperbolic equations and a finite-difference scheme for the elliptic ones. 相似文献
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对抛物柱面聚焦器焦平面上的辐射通量分布作了模拟计算和实验研究。计算时采用经某些改进的“半有限积分法”使之更能反映实际运行情况。实验研究采用摄影法,分别以太阳和月亮为光源的折摄焦平面上的像斑。模拟计算与实验结果比较吻合。 相似文献