An Energy-Saving Control Strategy on Central Air-Conditioning System

An energy-saving control strategy based on predictive control for central air-conditioning systems is proposed in this paper. The cold load model is developed to describe the dynamic characteristics of temperature control systems, and then parameters in the cold load model and in the central air-conditioning system model are estimated. Generalized predictive control (GPC) is used to establish an optimization model to minimize the consumption of energy and the control error of temperature. The simulated annealing (SA) algorithm, combined with quadratic programming, is adopted to solve the optimal problem. Contrasted with the simulation of traditional PID control, the results prove the effectiveness of this proposed strategy.

Optimum Energy Management of the Central Air-Conditioning System in Intelligent Buildings

An optimum energy saving scheduling strategy of the central air conditioning system in an intelligent building (IB) was proposed. Based on the system analysis a set of models of the central air conditioning system was established. The periodically autoregressive models (PARM) based on genetic algorithms (GA) were used to predict the next day’s cold load. The improved genetic algorithms (IGA) with stochastic real number coding were used to finish the optimum energy saving scheduling of the system. The simulation results for the building of the Liangmahe Plaza show that the proposed strategy can save energy up to about 24 5%.

Energy performance assessment on central air-conditioning system of commercial building: A case study in China

Energy performance assessment on central air-conditioning system is essential to optimize operating, reduce operating costs, improve indoor environmental quality, and determine whether the retrofitting of the equipment is necessary. But it is difficult to evaluate it reasonably and comprehensively due to its complexity. A "holistic" approach was discussed to evaluate the energy performance of central air-conditioning system for an extra-large commercial building in a subtropical city. All procedures were described in detail, including field investigation method, field measurement instruments, data processing and data analyzing. The main factors affecting energy consumption of air-conditioning system were analyzed and the annual cooling-energy use intensity of this building was calculated and also compared with other shopping malls and other types of buildings in Guangzhou. And COP(coefficient of performance) of chiller, water transfer factor of chilled water system and cooling water system were taken into consideration. At last, the thermal comfort and indoor air quality issues were addressed. The results show that the chilled water pumps are over-sized and the indoor environmental quality should be improved. The purpose of this work is to provide reference for energy performance assessment method for air-conditioning system.

Analysis and Modeling of the Central Air-Conditioning System in Intelligent Buildings

The central air conditioning system in an intelligent building (IB) was analyzed and modeled in order to perform the optimization scheduling strategy of the central air conditioning system. A set of models proposed and a type of periodically autoregressive model (PAR) based on the improved genetic algorithms (IGA) were used to perform the optimum energy saving scheduling. The example of the Liangmahe Plaza was taken to show the effectiveness of the methods.

Application of Dual Throttling Air-Conditioning System to Explosion-Proof Frequency Converter

An explosion-proof dual throttling air-conditioning system was put forward to solve the heat dissipation and internal dewing problems of explosion-proof frequency converter in the underground coal mine. This study investigated the feasibility and benefits of explosion-proof dual throttling cooling and dehumidification air-conditioning system applied to the explosion-proof frequency converter. The physical model of dual throttling air-conditioning system was established and its performance parameter was described by mathematical method. The design calculation of the system has also been done. The experimental result showed that the system reached the steady state at the refrigeration mode after running 45 min, and the maximum internal temperature of the flame-proof cavity was 31.0 ℃. The system reached the steady state at the dehumidification mode after running 37 min. The maximum internal relative humidity and temperature of the flame-proof cavity were 33.4% and 36.3 ℃, respectively. Therefore, the proposed system had excellent ability of heat dissipation and avoided internal dewing. Compared with water cooling system, it was more energy-saving and economical. The airflow field of dual throttling air-conditioning system was also studied by CFD simulation. It was found that the result of CFD numerical simulation was highly consistent with the experimental data.

中央空调系统制冷机组节能优化

空调系统是公共建筑中重要的基础配套设施,其能源消耗占据较大比重,在节能降耗方面存在巨大潜力。为实现在满足冷负荷需求的条件下达到中央空调系统总运行能耗最小的目标,建立了中央空调系统制冷机组能耗模型,并将室外湿球温度和实时的冷负荷值作为空调系统能耗模型的输入条件,分别利用粒子群算法和改进粒子群算法获得在不同负荷需求时空调系统对应的最佳工作点,实现中央空调系统运行优化节能的效果。

医院集中供汽式供应室降低蒸汽能耗的实践研究

以南昌大学第一附属医院为例,对综合医院集中供汽式供应室蒸汽能耗进行实践研究,定量分析灭菌锅次、供应时间与天然气用量的关系,定性分析疏水设施对天然气用量的影响,得出了易于获取的评价指标,建立了供应室蒸汽能耗的动态评价控制体系并进行实践,取得了较好的节能效果。

智慧供热技术在城市集中供热系统的应用分析

智慧供热是将供热生产、供热输出、供热信息控制与传统集中供热的有机结合,以供热管网水力信息、室温采集为主题,实现了一种新型的智慧供热系统。将系统控制、水力信息、控制云平台一体化,达到数据采集智能化、系统调控自动化、运营监管化,达到供热稳定、高效节能、绿色环保的最大目的。随着我国城镇集中供热区域和供热规模的不断增大,供热方式日趋复杂化,对供热企业的运营和经营管理也提出了更高的需求,而智慧供热技术的发展,为实现“均衡输送、按需供热”的城市集中供热管网建设,起到了很好的支撑作用。

发电厂集控运行中的节能措施分析

阐述发电厂集控运行的节能降耗问题及原因,提出一系列解决措施,包括加强锅炉控制、确保汽轮机组高效运行、降低电厂整体用电、优化电厂生产管理。这些措施能够减少能源浪费和环境污染,提高企业的竞争力。

机场航站楼空调水系统深化设计方法与案例研究

为实现中国民航业的绿色可持续发展,中国政府提出了打造绿色低碳航空、提高服务保障能力、推进技术进步和节能减排等要求,对中央空调系统能效有更高的要求。对于新建航站楼,通过节能措施提升系统的整体能效是关键所在。文章以我国夏热冬暖地区枢纽机场航站楼为例,主要从中央空调系统的水系统方面开展研究,开展能效分析,提出节能措施,既为新航站楼中央空调的建设提供参考依据,又为现有航站楼中央空调系统的改造提供数据支持。

发电厂集控运行系统的节能降耗技术分析

阐述火电厂集控运行的能耗现状、能源消耗的主要原因。探讨提升火电厂集控运行节能降耗技术的方法,包括高效燃烧技术、汽轮机节能技术、发电系统优化技术、智能化控制技术。节能技术的应用可以提高火电厂能源利用效率、降低能耗和排放量。

海洋石油161平台中央空调新型制热节能技术应用研究

为节能降耗、提高平台电站稳定性,采用新型制热节能技术,以平台热介质锅炉系统产生的热油为换热源,替代生活楼中央空调原有的电加热器制热,为平台生活区域供暖。该技术实施后,平台电站负荷有效降低,燃料消耗和平台碳排放量减少。

建筑集中生活热水水质保障与节能节水关键技术

分析了建筑集中生活热水水质下降和系统运行费水耗能的根本原因,明确了水质保障及节水节能技术是涵盖从热源制热到终端配水的系统性和综合性技术,剖析了集贮热式无动力太阳能系统、半容积式水加热器、节能节水循环技术、专用消毒灭菌技术在集中生活热水供应系统中保障水质和节能提效方面的综合效用,提出了集中生活热水系统水质保障、节水节能全系统解决方案,可为建筑集中生活热供应系统的设计及运维提供全面性、有效性的技术支撑。

基于模糊理论的中央空调冷水机组节能控制方法

中央空调系统的能耗设备主要为制冷机组、水泵、风机。其中,制冷机组是整个系统中能耗最大的设备,因此,对制冷机组进行节能控制具有重要意义。但传统的恒温节能控制和时间节能控制方法往往无法根据环境温度的变化或负载变化进行智能调控,为此,设计基于模糊理论的中央空调冷水机组节能控制方法。设计二维结构的自适应模糊PID节能控制器,定义输入和输出变量的词集,建立模糊PID节能控制器的控制规则,对进入控制器的两个采样输入量实施模糊化处理,输出模糊化处理结果,以温度误差和误差变化作为输入变量,以调整中央空调冷水机组的输出量为最终输出量,对中央空调冷水机组进行节能控制。结果表明,该方法的温度误差仅为0.2℃,湿度误差仅为0.4%,投入后年总耗电量有效降低,具有较好的温度均匀控制效果,对于阶跃扰动响应的反应速度更快。

供热节能技术在集中供热系统中的应用

从本质上讲,集中供热是1种节能供暖方式,但是从当前的供热发展现状来看,集中供热在节能方面还有很大的提高余地,集中供热技术革新具有十分深远的意义。介绍了集中供热系统存在的问题,描述了集中供热系统节能技术措施的具体应用和节能改造的必要性,提出了集中供热系统节能改造的解决对策,主要包括热源和热网的节能改造,从而促进和实现供热系统的节能减排,推动供热行业的健康、可持续发展。

基于旧建筑改造的高端酒店式公寓热水系统设计难点探讨

近年来,由于我国社会经济转型、人口结构的变化,原先建造的大量建筑已经不满足市场经济的需要,存量旧建筑的改造成为一种行业现象。而改造项目由于新、旧标准不一致,建筑定位、功能、分隔变化,需要衔接原系统等原因,设计难度往往大于新建项目,通过海南三亚某小区3栋高层住宅楼改高端酒店式公寓的改造案例,分析阐述了原建筑集中热水系统存在着诸如系统过于复杂、热损失较大、采用太阳能+空气源热泵作为热源的双能源耦合热水系统无法实现耦合等比较典型的改造设计难点,并针对这些现存问题提供了如减少热源,简化、优化系统等一系列解决方案。旧建筑改造完毕后,至今运营良好。通过案例剖析,探讨了高端酒店式公寓热水系统改造设计思路。

探讨集中供热系统的节能优化

随着我国城市化进程加速发展,城市居民对于居住环境和居住条件要求也越来越高。由于集中供热是现代化城市建设中不可缺少的部分,人们对此也有了更高要求。基于此,首先针对现阶段我国供热系统存在的主要问题进行分析,并且提出几种有效的节能技术措施,最大限度降低集中供热系统的能耗量,实现更高的经济效益和社会效益,为后续类似工作的顺利实施提供一定的参考和借鉴。

城镇集中供热节能改造的技术设计

本文指出城镇集中供暖关乎民生福祉,但部分老旧小区存在供暖技术落后、能耗较高等问题。针对这些问题,为进一步提高供热节能水平、实现供热产业减排目标,近年来部分地区进行了节能改造。本文以具体的工程案例为蓝本,从热源、输热管线等两个方面探讨了具体的技术改造与执行策略,并就其具体的节能效果进行了数据对比分析,旨在为后续的同类施工提供必要参考。

“双碳”目标下区域集中供冷问题——以济南为例

中国建筑耗能约占全社会总能耗的30%,成为能源消耗的三大“耗能大户”之一。其中,空调系统在建筑耗能中的占比高达50%,是建筑运行能源消耗中最主要的组成部分。在“双碳”目标下,建筑节能减排潜力巨大。在此背景下,全国多个城市开始探索“区域集中供冷”的方案。本文以山东省济南市中央商务区(CBD)试运行“集中供冷”为例,分析探讨集中供冷模式的优势特点,以及项目难以推广的原因,并从公用事业和公共服务的角度,就提高“集中供冷”这项新兴的城市公用事业在未来大规模实施的可行性提出解决方案,旨在为推动“集中供冷”的推广使用和运行实践提供参考。

长江流域冬冷夏热地区中央空调的节能研究

长江流域冬冷夏热地区的中央空调能耗一直是重要的节能研究领域。文章旨在研究长江流域冬冷夏热地区中央空调的节能问题,通过探索节能的关键技术和实际效果,为该地区的中央空调节能提供理论和技术支持,减少能源消耗及保护环境。论文得到了以下结论:中央空调节能关键技术的应用可以显著降低能源消耗,并且具有较高的经济效益;适当的室内温度控制策略和建筑隔热措施可以达到节能的效果;空调设备的选型、设备运行维护和经济性评估对中央空调节能有显著影响。文章对长江流域冬冷夏热地区中央空调的节能进行了深入研究和探讨,提出了一系列关键技术和措施,可以为该地区的能源保护和环境保护提供理论和技术支持。