共查询到20条相似文献,搜索用时 15 毫秒
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This paper presents a novel energy-efficiency control method for a fan-coil unit, the duty ratio fuzzy control method (DRFCM), which employs the concept of duty ratio on the electric valve control to fully utilize the cooling and dehumidifying capacity of a fan-coil unit when the control valve is closed. By means of mamdani-type fuzzy rules and functioning-fuzzy-subset inference methods, the duty ratio of valve and fan speed signals are decided according to the deviation and deviation changes of the room temperature. This paper adopts a two-water-pipe FCU system with a three-fan speed control and an electric water valve on-off control as test objects to verify the application effect of DRFCM. Program controllers and software tools are employed to conduct DRFCM. The conventional control method is applied by individual FCU controllers. Experimental results show that DRFCM could obtain at least 30% energy savings (not including chilled pump power savings) over the conventional control method. A preferable room temperature control effect could be achieved as well. 相似文献
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介绍了瞬态电磁阀总开启率一定的情况下确定风机盘管水系统等效阻力系数变化范围的方法。分析了风机盘管水系统瞬态相对供冷量、相对水量、电磁阀开启率及相对供回水压差之间的关系。讨论了末端平均供冷量对水系统整体水力和热力特性的影响。 相似文献
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卧式风机盘管机组舒适性能的评价 总被引:4,自引:0,他引:4
阐述了卧式风机盘管机组在什么性能方面的问题及其产生的原因,运用常规的计算方法,获得了风机盘管机组的气流运动轨迹、温度和速度衰减。分析结果表明,该机组的大送风温差及低流速,导致使用区内强烈“吹风感”,远不能满足舒适条件。开发一种全新的风机盘管机组是非常必要的。 相似文献
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风机盘管机组的合理选用 总被引:9,自引:2,他引:9
按冷负荷选用风机盘管,往往不能取得令人满意的空调效果,必须注意选择有一定机外静压和风量、焓差合适的机组,以保证必要的送风温差和换气次数,国产风机盘管只有走出高冷、低噪、小风量、焓差单一的发展误区,才能真正缩小与国际先进水平之间的差距。 相似文献
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分析了风机盘管机组选型中风量与冷量不一致的原因,并探讨了风机盘管机组设计工况性能修正方法、机组的空气处理能力以及选型的依据. 相似文献
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This paper proposes a typical multi-variable, large time delay and nonlinear system, self-extracting rules fuzzy control (SERFC) method to maintain a stable temperature value in a built environment chamber with supply air system and hot-water system. The parameters of the transfer functions in every control loop were identified by experimental data in a format of time sequences obtained from the experiment of dynamical responding performance. Fuzzy control simulations were implemented based on adjustment of the supply air system and hot-water system by SERFC. The simulation results show that SERFC for environment chamber has satisfied performance. There is no higher overshoot and stable error. The work presented in here can be used to deal with those complex thermal processes with difficulties in modeling of fuzzy control rules and provide a foundation for further application of fuzzy control in HVAC system. 相似文献
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风机盘管机组设计问题探讨 总被引:4,自引:0,他引:4
针对风机盘管机组在工程实际中存在的问题,分析了影响机组使用风量降低的原因,阐述了改进风机盘管构造的设计方案,提出盘管由三排改为两排的可行性和经济性。 相似文献
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风机盘管选型及系统设计中的一些问题 总被引:8,自引:1,他引:8
探讨了风机盘管系统设计中风机盘管选型、风系统设计及新风处理等问题,指出了风机盘管选型风量应按实验热湿工况计算得到,并指出应重视影响风机盘管实际送风量的各种因素,建议采用改变我处理终状态以解决低热湿比工况下风机盘管选型难的问题。 相似文献
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Fuzzy control of disturbances in a wastewater treatment process 总被引:9,自引:0,他引:9
A. Müller S. Marsili-Libelli A. Aivasidis T. Lloyd S. Kroner C. Wandrey 《Water research》1997,31(12):3157-3167
This paper describes a real-time process control scheme to cope with the problem of input disturbances in wastewater treatment processes, based on a fuzzy inferential control system. This can detect the presence of a dangerous input conditions whenever either organic overload or inhibitory/toxic compounds are present in the raw wastewater. Based on this diagnosis, a set of fuzzy rules are implemented to divert the process flow and bring the system back into a safe state. The control system was designed and tested using a pilot plant, to which a toxic disturbance was applied. Its behaviour with and without fuzzy control are compared, and the process reliability improvement in the controlled case is demonstrated. 相似文献
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介绍了大温差风机盘管机组的研制背景和技术途径,并对研制机组各种工况下的性能测试数据进行了深入分析。分析结果表明:研制机组的供冷性能是可靠的,在机组进水温度分别为7,6,5℃,相应进出水温差分别为7,8,9℃时,研制机组的供冷量均达到或大于常规机组的国家标准值;机组进水温度降低1℃和温差增大1℃时,机组的供冷量增加;供热工况下,进水温度55℃时,研制机组高挡和中挡时的供热量高于国标值,进水温度50℃时,机组高挡供热量接近国标额定值,但进水温度45℃时,机组供热量明显达不到国标额定值。测试结果表明,研制机组额定水阻力在合理范围(2~5m)内。对实测数据的分析显示机组配置无刷直流电动机具有良好的节能性,尤其在中低挡转速工况。某工程的实际运行数据表明,与配置交流电动机相比,直流电动机的投资可在3年内回收。 相似文献
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为了考察低温热水地板辐射采暖在成都地区的应用效果,进行了地板辐射采暖和盘管对流采暖对比实验。结果表明,地板采暖空气竖向温、湿度梯度小,热量传递以辐射换热为主,辐射散热量占59.8%,在相同工况下,地板采暖的有效采暖时间是盘管采暖的2.7倍,地板采暖既舒适,也更经济节能。该对比实验研究为低温热水地板辐射采暖在夏热冬冷地区的推广应用提供了一定的依据。 相似文献