共查询到18条相似文献,搜索用时 140 毫秒
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针对目前高校供暖面积分布广,管理难度大,系统能耗高等特点,研制开发了一套校园楼宇供暖集中监控系统,并通过校园局域网实现了校园供暖集中监控,采用温差控制方式调节各楼供暖温度,利用不同的供暖模式实行分楼分时段供暖。实例应用结果表明,该系统技术先进、经济实用,节能效果显著,适合在高校推广使用。 相似文献
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根据《供热工程》(第四版)和《民用建筑供暖通风与空气调节设计规范》的要求,通过供暖热负荷供热调节的基本公式,对直接供暖热源和间接供暖热源供回水温度同供暖室外温度的关系公式进行详细计算和分析研究,得到锅炉房、热力站运行温度曲线图表及计算公式。并结合当地集中供暖运行温度曲线图表的应用,阐述采暖期按室外温度提供热源供回水温度以达到集中供热节能的意义。北方各地区集中供暖热源的供回水温度是根据采暖期的室外温度来确定的。推导出直接供暖热源和间接供暖热源的供回水温度同供暖室外温度的计算公式。 相似文献
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我国现阶段城镇的供热方式主要以热电联产,大型锅炉房集中换热为主。设计方对各个换热站水泵的流量,扬程选型都预留系数在1.2~1.5左右,造成电机功率较大,属于高耗能运行,供暖成本居高不下。对集中供热系统中长期存在大流量,高扬程水泵的原因及弊端进行了系统分析,并通过改造实例及运行状态,达到了节能的目的。 相似文献
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为平衡供暖节能与舒适性的矛盾,通过对既有建筑的热负荷变化分析,提取出室外温度作为调节依据,采用气候补偿的方式调节供暖运行,降低系统能源消耗,达到优质供暖,按需供应的目的。针对某高校供暖的实际问题,给出供暖节能方案并进行分析,分析结果证明气候补偿运行模式在供暖节能上有优越性。 相似文献
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根据老城区集中供热系统工艺过程特点,提出热网水力平衡、改善热源运行调节、全面的节电技术改造及分时分区温控供暖等措施与方法,改善实际供暖情况。 相似文献
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针对感应加热电源温度控制,采用了一种新型模糊控制控制器,介绍了基于该模糊控制的感应加热温度控制系统的构成及其设计。通过MATLAB/SIMULINK进行了仿真,仿真结果验证了该温度控制系统的有效性和优越性。 相似文献
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Lianying Zhang Min Zhou Chunfang Yang Yuefei Li Zhibo Fu Juanfang Wang Liwen Jin 《国际能源研究杂志》2020,44(12):9399-9413
Using high-temperature heat pump technology to recover waste heat of circulating cooling water in a steel plant for central heating system not can only reduce the temperature of circulating cooling water to meet the needs of smelting process but also can save energy and protect environment as well as bring great economic benefits to steel plant that can sell heat to the heat users. The energy consumption equation of heat pump central heating system was established based on the energy consumption of heat pump, energy consumption of water pump, and heat loss. The optimal inlet water temperature, inlet flow rate, and the number of operating heat pump modules at different outdoor temperatures were calculated by genetic algorithm. The superiority and operating control strategy of heat pump central heating system were discussed. The results show that with the increase of outdoor temperature, the optimal inlet flow rate and the number of operating heat pump module decrease. However, the inlet water temperature almost does not change. It is more suitable for the heat pump central heating system to change the inlet flow and the number of operating heat pump modules. The operating control strategy equation was established by linear fitting, which provides guidance for the engineering application of heat pump central heating system. 相似文献
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为了解决我国北方地区风电的弃风问题,改进剩余风电供暖系统的直接消纳储能技术,改善电蓄热供暖控制系统中存在换能装置电热转化效率低下的问题,经过方案对比提出采用电热转换效率高、安全可靠性好的电磁感应加热装置作为供暖系统的换能装置。为优化储能水箱加热供暖系统的控制策略,针对系统给定的控制需求,采取前级附加给定温度模糊控制器串联后级感应加热模糊PID控制器的复合控制策略,使闭环加热系统的给定温度随室外温度的变化而调整;同时为了节约不可再生能源,降低损耗,采用与后级模糊PID控制器的输出构成闭环比值随动控制系统的加热循环流量协调控制策略。利用Matlab/Simulink软件进行仿真实验,结果表明:模糊PID控制特性明显优于传统PID控制,系统的超调量显著减少,动态调节速度明显加快;实现模糊控制和模糊PID控制复合与协调智能控制策略的网络化,提高了系统控制的实时性和可靠性,使系统控制性能大为提升。 相似文献
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《Applied Thermal Engineering》2007,27(8-9):1495-1500
The temperature of the water returning from the network affects greatly the efficiency of a geothermal district-heating system (GDHS). The temperature of the returning water depends on whether there is a heat exchanger between network flow and indoor circulation. The return temperature also depends on outdoor temperature and logic of the indoor temperature control system. In this paper, four control logics are defined depending on whether indoor circulation is separated from network circulation or not. Return temperature and circulation rate of network flow are calculated for these control logics. The results show that the flow rate of the network flow and annual consumption of the geothermal fluid could be decreased about 10% or over by using optimum control logic in district heating systems. 相似文献
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Koichi Sato Masato Miyakawa Masateru Nishioka 《International Journal of Hydrogen Energy》2021,46(38):20213-20221
A microwave (MW) heating system induced by a magnetic field was designed and applied for uniform heating of a Pd membrane selectively through hydrogen. This system aimed to control the temperature of the membrane and the hydrogen permeation rate. Although the conventional dielectric heating by MWs is not suitable for metal membranes because of the reflection of MWs, a magnetic field can excite the surface current (eddy current) and causes Joule heating. First, this was successfully achieved for thin metal films in a frequency-variable single-mode MW reactor system with a cylindrical cavity. The temperature of the surface was controlled precisely by a resonance frequency autotracking function. Then, for the control of the hydrogen permeation rate through the Pd membrane, this system was applied to a pore-filling-type Pd membrane where the Pd nanoparticles were filled in the nanospace void of the Al2O3 support tube, suggesting high durability. The temperature of Pd membrane could be quickly and precisely controlled due to direct heating by this MW system. Hydrogen permeation rate was well controlled associated with the temperature of the membrane. 相似文献
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采用了一种供热管网多点测控系统的设计原理和实现方法,针对用户可自我调节温度的集中供热要求进行了自动控制系统设计.该系统能够根据室外温度和用户热量进行自动控制. 相似文献