共查询到20条相似文献,搜索用时 234 毫秒
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介绍了蒸汽采暖改为高温热水采暖系统的管路设计、改造、加热方式及系统的调试运行。实践证明,蒸汽采暖改为高温热水采暖切实可行。 相似文献
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C6-35/10汽轮机改前,机组长期在超低负荷下运行,热量损失较大。通过蒸汽采暖改为热水采暖,尤其是改为低真空采暖后,可使汽轮机在发电的同时利用其排汽加热采暖用水,进而达到了节能降耗的目的 相似文献
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地板辐射式供暖的能耗分析 总被引:3,自引:0,他引:3
依据辐射供热室内辐射与对流综合作用的传热规律,计算和分析了地板辐射式采暖房间能耗的构成及影响因素,给出在相同舒适度条件下,几种常见的围护结构地板辐射式供暖房间的能耗随地表面加热温度的变化关系,并与相应的对流式采暧进行了对比。 相似文献
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《电气工程学报》2015,(9)
本文以24k Hz/100k W的电磁热储能系统为研究对象,系统采用电磁感应加热的方式,将由新能源发电系统产生的清洁电能转化成为热能,并将这些热能加以利用或者存储在水中。首先应用Ansoft-Maxwell对感应加热模型进行涡流场仿真分析得到磁场分布,利用得到的磁感应强度计算流体场热源。然后应用Ansys/Fluent对感应加热模型进行三维流体温度场仿真分析。感应加热系统的电源设计在电磁热储能系统中有着至关重要的地位,应用Matlab/Simulink对感应加热电源串联谐振电路进行建模仿真分析,得到谐振状态下的电路特性曲线,给出了PLL锁相环信号、PWM全桥逆变触发信号等波形,为电磁热储能系统的感应加热电源的研究和开发提供了一定理论依据。 相似文献
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在矿场油气集输领域内,对净化原油、含水原油、掺输、含油污水及采暖清水等介质均需进行加热,每个站都需要有一定数量的加热炉。一般的油气接转站有3种介质需同时加热,联合站有4种介质需同时加热;需要被加热的介质多,且加热炉功率较小,能耗和污染物排放量较高。通过在矿场油气集输系统应用相变加热炉,使加热炉的工况根据加热介质流量的大小自动进行温度调节,在节约能耗减少污染物排放量的同时,减轻了劳动强度,炉效可达到90%以上。 相似文献
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超导直流感应加热是近年来基于电磁感应原理为铝和铜挤压工艺开发的一项全新的感应加热技术。简述了它的发展历史、工作原理以及与传统交流感应加热相比的优点和局限性,介绍了它的一些关键技术,如电磁和热过程耦合的数值模拟、磁体的设计和超导技术的应用等,并对我国开展这方面的研究提出了建议。 相似文献
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This article proposes the use of strain energy density (SED) for the prediction of fracturing in silicon steel slabs undergoing reheating in a furnace. Reheating is commonly used to soften steel before hot rolling into ultra-thin silicon steel sheets referred to as electromagnetic steel. High heating rates are required to reduce the time spent in the reheating furnace to increase the efficiency of producing ultra-thin electromagnetic steel sheets and decrease fuel consumption. However, an excessive increase in heating rates may induce fracturing due to the comparatively brittle nature of the silicon used in electromagnetic steel slabs to enhance the electromagnetic properties. In this study, the authors used finite element numerical calculation to elucidate the fracture mechanism of electromagnetic steel slabs undergoing heating. The authors then used SED as a criterion by which to optimize the heating rates without inducing fracturing in electromagnetic steel. The proposed model could be used as a guide to shorten the time required for heating various types of steel in reheating furnaces. 相似文献
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本文较系统地、定性地对感应加热中的电磁力问题进行了论述和分析。在研制感应加热设备时,电磁力对感应器、工件和传动机构作用等应作充分考虑,并应采取相应的措施。 相似文献
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Analysis of thermal performance of electromagnetic induction based molten salt heating system
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将电磁感应加热技术应用到低谷电加热熔盐储热供暖领域,搭建熔盐电磁感应加热实验系统,以感应加热器为研究对象,探究熔盐以及线圈冷却水在不同熔盐流速和线圈电流工况下的温度变化规律,计算加热效率和冷却水热损失率。结果表明:电磁感应加热器可以快速加热熔盐,熔盐温升主要集中在开始加热80~240 s之间,温升速率在100 s时最大;改变线圈电流或熔盐流速,可以产生不同终温的熔盐,流速0.177 m/s时,熔盐在不同电流下出口温度分别为201.452 ℃、203.891 ℃、207.599 ℃、212.975 ℃和221.454 ℃;熔盐流速一定,熔盐和线圈冷却水吸热量随线圈电流的增加而升高;线圈电流不变,熔盐吸热量随流速的增加而升高、线圈冷却水吸热量随流速增加而降低;熔盐流速0.296 m/s、线圈电流600 A时,熔盐加热效率为69.28%,线圈冷却水热损失率为16.45%。 相似文献
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Both intermittent and continuous heating are widely used for radiant floor heating systems in Korea, Intermittent heating circulates hot water according to a predefined schedule while the continuous heating controls water flow using thermostat control units. The standard version of SERI‐RES has been modified for the numerical simulation of the problem. Results show relatively large temperature swings in the case of intermittent heating with solar availability, although it costs less to implement due to its simplicity in design. On the other hand, the case of continuous heating would avoid such undesirable temperature fluctuations. These results are also verified by experimental evaluations. Copyright © 1999 John Wiley & Sons, Ltd. 相似文献
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A parametric study on radiant floor heating system performance 总被引:2,自引:0,他引:2
Efficient radiant heating systems are promising technologies for energy saving in commercial and building sectors together with improving occupant thermal comfort. However, the thermal performance of radiant systems in buildings has not been fully understood and accounted for in currently available building energy simulation software. In this paper, the effects of design parameters on performance of a typical radiant floor heating system have been studied using finite element method. A radiant heating system includes a number of pipes filled with hot water. Therefore, several design parameters such as pipe diameter, type (material), number, thickness and cover of system are affected on the value of transferred heat. In this study, transient conduction, convection and radiation heat transfer mechanisms are considered meanwhile analyzing the typical problem by using a finite element method solver. It is noted that the type and thickness of the floor cover are the most important parameters in the design of radiant heating systems. 相似文献
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基于ANSYS的锻件感应加热温度场的数值模拟研究 总被引:2,自引:0,他引:2
针对感应加热过程中工件温度难以测量的问题,应用电磁学和传热学基本理论,建立了锻铸坯料电磁场和温度场分布的数学模型,运用ANSYS软件对感应加热过程温度分布进行变参数研究,为揭示铸坯感应加热过程的规律、优化工艺参数提供理论依据。 相似文献
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低温地热供热系统的设计与质调节问题 总被引:1,自引:1,他引:1
对直接式和间接式低温地热供热系统的设计与质调节问题进行了分析和讨论,给出了不同室外温度条件下的混水比例的计算方法和公式,为低温地热供热系统的优化设计和控制提供了理论依据。 相似文献