共查询到20条相似文献,搜索用时 31 毫秒
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供热计量中的几个问题 总被引:13,自引:3,他引:10
认为热计量方式的采用,使传统的户内供暖系统发生了很大变化,提出:散热量可自动调节是计量供热的前提;宜提倡按户分环式的计量供热系统;由于行为节能的引入可能会造成户内系统立管上压差产生剧烈变化,因此立管上宜设置必要的恒压差、恒流量阀;应该注意暖气罩对计量供热的影响。 相似文献
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任英 《智能建筑电气技术》2012,6(6):79-81
针对电厂风机或水泵等辅机系统采用阀门、挡板调节管路流量而造成大量电能资源浪费问题,结合水泵或风机变频调速节能控制原理,本文提出利用变频调速方案对电机控制系统进行节能升级改造. 相似文献
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一次泵系统冷水变流量节能控制研究 总被引:2,自引:0,他引:2
比较了一次泵系统冷水变流量的控制方式,指出温差控制法适用于用户端不设调节阀、空调区域个性化要求不高的场合,否则宜采用末端压差控制方式。给出了压差控制法的节能估算公式,并指出压差控制阀的节能效果逊于温差控制法的程度与设定压差和设计扬程的比值有关。 相似文献
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供热系统循环水泵变频调节的最佳工况 总被引:4,自引:0,他引:4
计算了热水供热系统循环水泵变频调节与阀门节流调节相比节省的电功率,变频调节的节能潜力与水泵体积流量成复杂函数关系,而不是与水泵体积流量的3次方成正比。水泵变频调节在实际工况体积流量与设计工况体积流量之比为0.577时节能潜力最大,为0.385。 相似文献
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阐述了静态平衡阀和动态平衡阀的工作原理,针对恒流量供热系统、分阶段变流量供热系统、分户控制非计量收费供热系统、计量收费供热系统,论述了平衡阀的应用方法,强调了人工调试在实际供热工程中的重要性。 相似文献
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浅谈供暖系统中分户计量经验 总被引:2,自引:0,他引:2
分析了分户计量供暖系统中的几个问题,推荐了应优先选择的系统形式;对于双管系统的利弊进行了分析,同时也提出了压差控制阀布置方案的选择原则以及温控阀和手动调节阀的选用依据,并指出了它们在应用中应注意的问题。 相似文献
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分析了两种模式补给水泵连续补水定压的工作状况与能耗之间的关系。指出在补水点上直接设置压力调节器的模式比在补给水泵旁道管上设置压力调节器的模式节能。 相似文献
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“以泵代阀”末端系统的能耗分析与系统优化 总被引:1,自引:0,他引:1
以集中空调系统的新风空调机组采用以泵代阀调节方式为例,计算水泵出口分别采用电动蝶阀、旋启式止回阀和蝶式双瓣止回阀三种不同阀件下的水泵供冷季节的能耗量,分析和比较系统的特点和能耗,提出用电动蝶阀替代止回阀有利于减少水泵能耗的观点。 相似文献
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Independent metering valve control system can overcome the shortcomings of the traditional four-side linkage valve controlled system, such as poor controllability and large energy consumption, especially under the overrunning load condition. Current researches mainly focus on the velocity, pressure and energy consumption characteristics of the hydraulic system. However, with the intelligent development of mobile machinery and the continuous improvement of work quality requirements, each actuator should not only meet the velocity and output force requirements, but also achieve high positioning accuracy. Therefore, according to the independent metering valve control system and pump-valve hybrid control principle, a velocity and position combined control strategy based on mode switching is proposed to control the boom and arm of hydraulic excavator. Then, a mechanical-hydraulic co-simulation model including the whole hydraulic excavator is established to verify the strategy, predict control characteristics and determine the controller parameters. Furthermore, a test prototype based on the above principle is established, and the boom and arm operating characteristics with the proposed strategy are tested and analyzed. The results show that the hydraulic cylinders can move smoothly along the expected trajectory under the premise of low energy consumption. The operate velocity fluctuation is small and the positioning error to the target position is about 1 mm. Due to the boom cylinder and arm cylinder in the research are separately typical two and four quadrants working actuators, the research work has universal significance to smooth, high-precision and low energy consumption automation operation of various types of mobile machineries. 相似文献
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蔡建林 《青岛理工大学学报》1990,(1)
本文详细研究了悬挂式缓闭减水锤止回阀在事故停泵期间的特性以及由停泵所引起的流体瞬变效应与阀的减水锤效果。应用以液压缸为控制系统的阀的各部分的运动方程,联同泵的压头平衡方程、转速平衡方程及管内瞬变流特性方程,构成计算的基本方程组。采用特征线法及牛顿——雷伏生法求解了管内全流场。得到了停泵后管线中压力随时间的变化情况以及泵及止回阀在停泵期间的运动情况。获得了悬挂式缓闭减水锤止回阀的减水锤效果,并对不同的参数所得的结果进行了比较。 相似文献
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根据泵在不同工况下运行的性能与特点,及泵流量、扬程、功率与转速的关系,通过调速与阀门节流的对比,阐述了调速节能的原理和经济效益,并用实倒说明了变频水泵选型时应注意的要点及选择气压罐的必要性,从而实现真正意义上的节能。 相似文献
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Energy efficient control of variable speed pumps in complex building central air-conditioning systems 总被引:1,自引:0,他引:1
Zhenjun Ma 《Energy and Buildings》2009,41(2):197-205
This paper presents the optimal control strategies for variable speed pumps with different configurations in complex building air-conditioning systems to enhance their energy efficiencies. Through a detailed analysis of the system characteristics, the pressure drop models for different water networks in complex air-conditioning systems are developed and then used to formulate an optimal pump sequence control strategy. This sequence control strategy determines the optimal number of pumps in operation taking into account their power consumptions and maintenance costs. The variable speed pumps in complex air-conditioning systems can be classified into two groups: the pumps distributing water to terminal units and pumps distributing water to heat exchanges. The speeds of pumps distributing water to terminal units are controlled by resetting the pressure differential set-point using the online opening signals of water control valves. The speeds of pumps distributing water to heat exchanges are controlled using a water flow controller. The performances of these strategies are tested and evaluated in a simulated virtual environment representing the complex air-conditioning system in a super high-rise building by comparing with that of other reference strategies. The results showed that about 12-32% of pump energy could be saved by using these optimal control strategies. 相似文献
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通过介绍北京金鼎大厦机电设备用房的VRV空调设计,酒店的消防控制室、酒店厨房冷菜间等特殊温度房间VRV空调设计,更加灵活丰富了VRV的应用范围。 相似文献