共查询到19条相似文献,搜索用时 233 毫秒
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随着集中供热系统不断扩容,热源布局和管网系统水力工况变得更加复杂,所以管网水力平衡调节技术要求也越来越高,从而使得分布式变频输配技术替代调节阀调节技术应运而生.分布式变频输配技术增强了系统的可调节性,且具有较大的节能潜力.针对供热输配系统进行了理论分析,旨在使分布式变频输配系统在智能化为主导的现代供热系统中应用更广泛、... 相似文献
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《Planning》2013,(12)
传统的供热系统热源泵必须按满足最不利用户的资用压头设计,靠阀门调节各热力站的水力平衡,阀门的截流损失浪费了大量电能,各热力站水力工况相互耦合,水力平衡调节难度很大。而分布式变频二级泵技术的供热系统,实质性地把传统的供热系统改变成了一种柔性的供热系统。大庆油田矿区服务事业部外围物业管理公司庆新区域供热系统改造方案,验证了分布式变频二级泵技术的节电效果,系统改造后总功率降低45.88%,年节约电能40%以上。 相似文献
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《区域供热》2014,(4)
在长距离大型供热管网改造的设计建设中,经过技术分析,通过合理布置中继泵站、选择增压泵扬程降低了管网运行压力,满足了不同设计参数区域管网对介质压力的要求,降低了管网基建投资和运行电耗。同时在区域热网主干线上采用混水技术解决了同一热源对不同设计参数区域管网供热的问题。运行过程中,通过全网水力计算和技术分析,采用分阶段改变流量的质调节运行方式,利用自动控制系统对加压泵和混水泵进行自动调节,既保证了热用户的需要又达到了节约管网运行电耗的目的。结果表明采用分布式加压泵对供热介质进行加压并利用混水泵对区域主管网进行混水调节能够很好地满足不同区域管网对介质压力、温度和流量的要求,提高了管网供热能力,节约了基建投资,达到了稳定供热的目的,并具有明显的节能效果。 相似文献
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本文从供热节能角度出发,针对工业区供热缺乏整体规划、供热负荷的使用统一性的特点进行节能对策研究,建立了枝状管网水力工况模拟分析的数学模型,提出了大型管网的基本回路矩阵简捷的生成办法,并应用Hardy Cross迭代法求解方程组,利用MATLAB语言编制了包括循环水泵性能拟合在内的供热管网运行的模拟程序,通过计算机模拟管网实际运行的水力工况,并以石家庄金石工业区供热管网为例,采用理论分析与数值模拟的方法,得出适合工业管网特性的能够降低供热运行成本、节约能源的运行方式。 相似文献
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以热量调节法为基础,对热力工况采用根据室外气候变化计算热负荷的方法,来制定热源运行参数表,从而达到按需供热、经济运行的目的;对水力工况的调节,针对不同的供热系统采用传统变流量或分布式变频系统进行调节,从而解决系统水力失调的问题,均具有良好的节能效果。 相似文献
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分布式水泵供热系统是集中供热水循环系统的新技术。近几年在新疆的集中供热系统中,特别是锅炉房偏离负荷中心的集中供热系统得到逐步应用,取得较好的节能效果,并带来锅炉房与热力站调节方便,提高一级管网供热能力的优点。本文针对新疆某城镇的一座集中供热锅炉房分布式水泵供热系统的改造设计,来分析分布式水泵供热系统的节能效果,提出了一些建议,以供同行们探讨,达到对分布式水泵供热系统的更深入认识。 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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通过分析得出了一次泵宜采用变频调节;为避免供水环路水力失衡,变频二次泵应设最低频率限制;提出变频二次泵应多台并联供水以满足系统低负荷时的水量需求,同时提出动态压力点控制法。 相似文献
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When receiving an urgent request from a smart grid, shutting down part of operating chillers directly in the air-conditioning system in a building can achieve immediate power reduction. However, no study has addressed how to determine the number of chillers/pumps to be shut down and how to regulate the load of retained equipment systematically during DR events. This paper presents a new approach to address these issues based on three schemes. A power demand optimization scheme predicts the building cooling demand and the power limiting threshold in response to a received DR request. A system sequence control resetting scheme determines the number of operating chillers/pumps to be retained. An online control/regulation scheme ensures the system power following the expected profile by regulating the total chilled water flow delivered to the building and therefore the chiller load. It also employs a cooling distributor to distribute chilled water to individual zones concerning different sensitivities/sacrifices to temperature increases. Case studies are conducted on a simulated dynamic building air-conditioning system. Results show that, during DR events, the proposed strategy can achieve the expected power reduction (i.e., about 23%) and also maintain acceptable zone temperature even though uncertainties exist in the prediction process. 相似文献
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为了回收某小区汽—水换热站运行时产生的大量凝结水,减少直接排放造成的能源浪费,对水—水换热站进行了改造.在换热站改造中用平衡阀补水定压方式代替了原有的补水泵定压方式;在水—水换热站中利用平衡阀将一次网的热水补入二次网中,并维持二次网的水压稳定.该方法简单易行、定压效果好、运行可靠.改造后,这种方式回收利用了较多的凝结水,从而节约了能源并减少了换热站的运行费用. 相似文献