共查询到20条相似文献,搜索用时 78 毫秒
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供热系统质调节的规范化与节能山西省运城地区建筑设计院李新波供热系统的调节,有质调节和量调节两种办法。其中量调节是在供回水温度不变的情况下,通过改变水量来达到节约能源的目的。但是热水采暖系统的设计,是以一定的水量为依据来计算的,当系统水量因调节而减少过... 相似文献
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从分析传统的户用烤烟房卧式炉缺点入手,提出立式供热炉的结构及其优点,并结合计算确定炉界面积和炉膛高度,最后测定主要试验数据以验证改进的设想。 相似文献
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首次为新模式热电联产低品位供热系统提出了一种用户端高效换热器-新型风机盘管,并对此从技术性、节能发生和经济性等方面进行了探讨和分析,旨在为新模式热电联产供热工程的实施提供理论依据。 相似文献
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A dynamic model of a direct district heating system (DDHS) is developed, and an energy optimal control strategy is designed. The DDHS is characterized as a system with long transport time delay. The use of a Smith predictor (SP) to deal with this type of time delay is explored. An SP is designed by using the reduced‐order dynamic model and implemented on the full‐order model. Also, optimal set point profiles of supply water temperature as a function of outdoor air temperature have been determined. The simulation results show that the SP works effectively in disturbance rejection compared with the nominal control design. The use of optimal set point control strategy resulted in energy savings of the order of 19–32% when the influence of internal load was considered. Copyright © 2004 John Wiley & Sons, Ltd. 相似文献
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《可再生能源》2017,(7)
针对现有光伏仿真模型无法执行电网调度指令的问题,提出响应电网调度需求的光伏发电系统建模及运行控制方法。根据不同容量光伏系统组成结构搭建了基于DIg SILENT的适用于不同容量的并网光伏发电系统模型,以光伏发电系统响应电网有功需求时间最小化为期望目标,考虑光伏发电系统出力的随机性,通过调整直流电压控制信号响应电网调度需求,利用控制模块中的有功出力限制满足并网点频率约束条件,采用电导增量法优化了MPPT控制策略。仿真结果表明,在有电网调度需求时构建的模型能够快速地响应电网调度指令,在无调度需求时能够很好地实现最大功率跟踪或限制有功出力以满足并网点频率约束。 相似文献
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In order to produce process heat for drying of agricultural, textile, marine products, heating of buildings and re-generating dehumidify agent, solar energy is one of the promising heat sources for meeting energy demand without putting adverse impact of environment. Hence it plays a key role for sustainable development. Solar energy is intermittent in nature and time dependent energy source. Owing to this nature, PCMs based thermal energy storage system can achieve the more popularity for solar energy based heating systems. The recent researches focused on the phase change materials (PCMs), as latent heat storage is more efficient than sensible heat storage. In this paper an attempt has been made to present holistic view of available solar air heater for different applications and their performance. 相似文献
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Soon-Young Choi Kee-Youn Yoo Jeong-Bin Lee Chee Burm Shin Myung-June Park 《Applied Thermal Engineering》2010,30(14-15):2067-2072
The development of a mechanistic model for the thermal plant in the district heating system is addressed. Energy balance is composed of the change of enthalpy and the generation of the heat by a fuel combustor, on the basis of several assumptions. Effective thermal capacitance is estimated using the data measured in the heating system of Su-Seo area in Korea, and the validity of the developed model is clearly shown by the comparison of outlet temperatures from the boiler between the model prediction and data measured during the period other than that for the estimation. The model performs satisfactorily, and its usefulness has been illustrated by the application of the model-based controller for the regulation of outlet temperature. The controlled case shows that the temperature is maintained close to the set-point, and the energy saving is expected to be about 10 million USD for a year in the area. 相似文献
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<正>一引言家用太阳能热水系统是利用太阳辐射能加热水的装置,它是目前太阳能利用领域中技术发展最成熟、经济上也最具竞争力的绿色能源技术,在生产和生活中得到了普遍推广和应用。 相似文献
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全钒电池的建模和运行参数是影响电池性能的重要因素,现有的等效电路模型往往由于缺乏和流体力学模型的耦合,无法研究流量对全钒液流电池性能和效率的影响,因而在实际项目应用中不够完善;另外纯粹的流体力学模型对于电池本身的电气特性过于简化,无法充分反映全钒液流电池系统的特性。因此本文利用钒电池基本原理和等效损耗建立了等效电路模型,根据机械损耗和钒电池结构参数,建立钒电池流体力学模型,根据搭建的钒电池系统等效模型分析电池运行参数对电池性能的影响规律。仿真分析表明,充放电期间的最优流量是关于荷电状态的函数,根据该现象利用流量随着荷电状态SOC的变化进行分段控制。通过仿真分析,根据SOC变化而分段控制流量的优化运行策略可以有效地提高钒电池效率。 相似文献