Multivariable fuzzy control of residential inverter-driven air conditionings

A model free intelligent muhivariable fuzzy controller （MFC） designed for modulating the vapor compression cycles in a residential inverter-driven air conditioning is proposed. The novel controller combines a traditional fuzzy controller （TFC） and an additional coupling fuzzy controller, the coupling fuzzy controller is introduced to compensate for the unknown cross-coupling effects of this muhivariable system. In order to evaluate the control performance of the MFC, it is digitally implemented in terms of regulating the desired evaporating temperature and superheat. The experimental results show the effectiveness of the MFC for improvement of system performance and energy efficiency.

COMPUTER DECOUPLE CONTROL OF TEMPERATURE AND HUMIDITY IN PREPROCESSING CHAMBER OF AIR-CONDITIONING TEST EQUIPMENT

This paper deals with the application of decouple Control theory to temperature and humidi-ty control in air-conditioning system. The decouple control algorithm for bivariable systems isderived applicablly for air-conditioning system. The algorithm is used to design a temperatureand humidity computer control system for the preprocessing chamber of air-conditioning testequipment. The results of the real-time control experiments indicate that the decouple controlalgorithm is feasible, the control quality is improved and high control precision is achieved.

Design of Fuzzy Controller for Central Air Conditioner

A structure of central air conditioning system in building and its running pattern are proposed in order to perform optimum energy saving strategy. The design of room temperature controller is taken as an example to discuss the design of fuzzy controller using common microprogrammed control unit (MCU) in detail. Based on fuzzy theory the query control tables fixed in read only memory (ROM) of MCU are established to realize the energy saving in the room temperature controller and the reasoning procedure is analyzed. The diagram of hardware design and the flow chart of software of room temperature controller are presented. The results show that the proposed method is practical and effective to achieve the energy saving goal.

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.

Operating Parameters of the District Heating Substation Cooperating With the Installation of Technological Air Conditioning With High Efficiency of Heat Recovery

The article analyses the problem of determining the operating parameters of the district heating substation cooperating with the air heating system in technological air conditioning systems equipped with heat exchangers with high efficiency of heat recovery.Attention was paid to the correct selection of heat exchangers for the heat output balance depending on the heat recovery protection algorithms against a drop in the temperature of the heat transfer surface below 0℃.Critical parameters were determined in Polish climatic conditions,at which the operation of the heat recovery exchanger in the air conditioning system is switched off or limited.It has been proven that the proper functioning of the district heating substation cooperating with the installation of air conditioning with high heat recovery efficiency requires the use of two heat exchangers with different characteristics,equipped with properly selected temperature control systems.The optimal model of cooperation between the technological air conditioning system and the heating substation was also indicated.

Study on the Elman Neural Network Operation Control Strategy of the Central Air Conditioning Chilled Water System

The stable operation of the central air conditioning water system always is a major difficulty for the control profession. Paper focus on the water system with multi variable, strong coupling, nonlinear, large time delay characteristics, presented use feed forward coupling compensation method, to eliminate the coupling effect between temperature and pressure. In this paper, the Elman neural network controller is designed for the first time, and the simulation results show that the response time of Elman neural network controller is shorter, the system is more stable and the overshoot is small.

Numerical Analysis on Ventilating and Air Conditioning Scheme of Shenyang Subway Station

Different cities have different climate conditions and outdoor temperature and humidity, so the scheme of an environment control in subway should be analyzed by considering objective conditions, project cost and operating status. In this paper, a physical and mathematical model is built according to the design of Shenyang subway (line 1), the boundary conditions of the model are defined by the design and experiments, the numerical analysis of ventilating scheme and air conditioning scheme is introduced individually, and the temperature field and air flow field of the two schemes are compared, so that the feasibility of using a ventilating scheme in subway of northeast cities is discussed. Considering comfort and economy, it can be concluded that mechanical ventilation is feasible in subway of northeast cities because the air temperature there is not very high in summer.

基于热舒适需求的空调系统风-水协同调控技术研究

公共建筑空调系统能耗在建筑总能耗中占有非常大的比例,如果在动态负荷变化下一直处于设计工况运行,在浪费冷量的同时又会导致能耗过高。结合实际工程案例建立展厅舒适度与空调系统模型,基于室内PMV(Predicitive Mean Vote,预测平均投票数)参数确定不同人数时空调系统最佳运行调控策略,使空调系统既能保证室内舒适度,又能最大程度降低运行能耗。结果表明,优化后送风量由原来的26 000 m^(3)/h下降至4 400~12 000 m^(3)/h;不同人数时的水阀开度在0.25~0.81之间变化;室内人数最多时节能率达11.9%,并且随着室内人数的减少节能率逐渐增加。研究结论对于指导公共建筑空调系统的节能运行具有重要的意义。

日本HEAS-02-2022《医院设施设计指南(空调设备篇)》介绍

日本HEAS-02《医院设施设计指南(空调设备篇)》已经持续应用了30多年,对我国医院建设影响较大。历经4次修订,最新颁布的2022版是由医学主席在疫情中主持修订的,鉴于气溶胶新的传播特性提出了相应的合适措施。在医疗环境控制方面提出了许多新的思路与措施,局部修订了空气洁净度级别和各医疗科室的通风要求。依据感染管理风险评估及推荐强度与证据质量实施合理的医疗环境控制,并对一些关注点进行了澄清。

基于GWO-BP神经网络的空调水系统泵阀联调优化控制方法

空调水系统的节能潜力较大,但管网中却通常存在动态水力不平衡的问题,这不仅影响了空调房间的室内舒适度,还会造成运行能耗的浪费。根据实验实测数据,建立了基于GWO-BP神经网络的水系统管网末端阀门开度预测模型,并根据最小阻力控制的原理,建立了基于神经网络的水系统泵阀联调优化控制方法。实验结果验证了该优化控制方法在优化计算后显著提升了末端阀门的开度,降低了水泵频率,可以有效降低水系统管网阻力并精确调节末端支路流量,对于水泵运行实现了27.63%至65.19%的节能率,具有明显的节能效果,且在水系统流量需求越小时,节能效果越好。

基于CNN-LSTM的地铁空调控制器剩余使用寿命预测分析

阐述综合考虑地铁空调控制器的特点,构建基于功能层及经济层的空调控制器样本数据集,通过建立CNN-LSTM模型对空调控制器的剩余使用寿命进行预测。实验结果表明,该预测模型准确度较高。

Control Strategies of Large-scale Residential Air Conditioning Loads Participating in Demand Response Programs

Residential air conditioning(RAC)loads have great potential to be included in demand response(DR)programs.This paper studies large-scale RAC loads participating in DR programs,such as modeling,parameters identification,DR characteristics and control strategies.First,an aggregate model of large-scale RAC loads are established based on the buildings’performance with heat storage and insulation,avoiding the calculation of a single RAC model.Then,parameters of the aggregate model are identified based on the RACs’power and outdoor temperatures.Based on the aggregate model,DR characteristics of RAC loads are analyzed,including the dynamic relationship between power,outdoor and indoor temperature,and the potential of DR combined with the users’comfort.Next,the DR control strategies adapted for large-scale RAC loads are established by adjusting the temperature set-points.The DR strategies consider users’comfort and calculate the control signals of each RAC load according to the DR power,including adjustment temperature and adjustment time,which are sent to each RAC load for execution.In the DR process,the control center does not need to obtain the users’indoor temperature,which is conducive to protecting the users’privacy.DR strategies of RAC loads when the control degree within/beyond the DR potential are both proposed,and a load recovery control strategy is also introduced.Finally,the effectiveness and accuracy of the proposed model and DR control strategies are verified by simulation results.

Hybrid Control Strategy for Air-conditioning Loads Participating in Peak Load Reduction Through Wide-range Transport Model

This paper proposes a hybrid control strategy of air-conditioning loads(ACLs)for participating in peak load reduction.The hybrid control strategy combines the temperature setpoint adjustment(TSA)control and on/off control together to make full use of response potentials of ACLs.The primary free transport model of ACLs has been established in literature at or near a fixed temperature setpoint.In this paper,a wide-range transport(WRT)model suitable for larger value of TSA is proposed.The WRT model can be constructed easily through the parameter of devices and indoor and outdoor temperature.To modulate the aggregate response characteristics of ACLs more friendly to the power grid,the safe protocol(SP)is adopted and integrated into the WRT model,which achieves a good unification of oscillation suppression and efficient modeling.Moreover,the hybrid control strategy is implemented based on the WRT model,and the model predictive control(MPC)controller is designed considering the tracking error and control switch cost.At last,the superiority of the hybrid control strategy is verified and the performance of ACLs for peak load reduction under this controller is simulated.The simulation results show that the hybrid control strategy could exploit the load reduction potential of ACLs fully than the TSA mode and track the reference signal more accurately.

华中-华东多回HVDC紧急功率转移控制的研究

随着三峡机组的全部投运,华中和华东电网将通过多回并行高压直流(HVDc)输电系统互联。文章在原有直流基本控制的基础上,提出了利用直流功率调制实现故障回路原有的直流功率向其它回路转移的紧急转移控制器(EPSC)。数字仿真和动模试验说明,所设计的控制器能实现故障线路的直流功率尽可能无差地向其它回直流线路转移,并能有效提高两侧交流系统的安全稳定性。

飞机空调车的模糊CMAC-PID温度控制器设计

关于飞机地面空调温度优化控制问题,飞机地面空调车温度控制系统具有参考模型不精确、非线性、时变、工作环境不稳定等特点。针对实际温度控制系统中应用到的传统PID温度控制器存在超调量大、响应速度慢、抗干扰能力弱等缺点,设计了一种新的响应速度快、稳定性高和抗干扰能力强的模糊CMAC-PID控制器。温度控制器利用小脑神经网络(CMAC)较强的自适应能力,与模糊PID控制器并行工作,能够迅速、精确、稳定的达到系统所要求的温度值。用Matlab软件进行实验,结果表明控制方式有效地改善了系统的动态性能、稳态精度和鲁棒性,具有较好的工程应用前景。

模糊-PID控制器在空调温度控制中的应用

该文首先利用计算机仿真软件中的优化工具箱对常规PID控制器中的比例、积分和微分参数进行优化,并且针对中央空调温度控制系统非线性、大滞后的特点,设计了在规则上可调整的模糊控制器,该模糊控制器通过α因子自调整和Ku的自寻优,达到适应和跟踪系统参数变化的目的;而后采用模糊逻辑工具箱和MATLAB函数相结合,方便地实现空调温度控制系统的计算机仿真。仿真结果表明,这种控制方式控制效果优于常规PID控制,有效地改善了系统的动态性能、稳态精度和鲁棒性。

地道通风楼房猪舍冬季环境因子空间分布规律研究

旨在探索空调控制的地道进风楼房猪舍冬季舍内环境因子的空间分布规律。采用现场仪器检测的方法,对冬季楼房猪舍妊娠舍和分娩舍不同空间位点的温度、湿度、风速以及CO_(2)、NH_(3)、粉尘浓度进行检测,妊娠舍和分娩舍分别完成105个和150个位点的测量。结果:在妊娠舍和分娩舍不同高度上空气粉尘粒度分布规律都是PM_(0.3)<PM_(0.5)<PM_(1.0)<PM_(2.5)<PM_(5.0)<PM_(10.0),其中PM_(10.0)的浓度最大为76.13和73.75μg/m^(3)。温度在垂直方向上随着高度的增加而上升,不同高度间差异极显著(P<0.01),在水平方向不同栏位间差异不显著(P>0.05)。风速在新风道0.1 m的高度上最大,在妊娠舍和分娩舍分别达0.75和0.41 m/s。CO_(2)的浓度随着高度的增加而增加,NH_(3)在新风道上的浓度随着高度的增加而增加;妊娠舍中CO_(2)和NH_(3)的最大浓度为1982.90和34.76 mg/m^(3),分娩舍中CO_(2)和NH_(3)的最大浓度为1177.20和8.63 mg/m^(3);妊娠舍和分娩舍CO_(2)和NH_(3)的最小浓度均位于新风道0.1~0.45 m的区域。结论:空调控制的楼房猪舍冬季保温效果好,地道进风系统能够为猪只呼吸区域提供较好的空气质量,妊娠舍3.6 km^(3)/h的换气量时舍内空气质量较差,建议增加阶段通风量以改善舍内空气质量。

空调温控的混合型Fuzzy-PI控制器

提出了一种用于空调系统温度控制的混合型Fuzzy PI控制器 它是由多修正因子模糊控制器与常规PI控制器并联而成 变风量空调系统的仿真结果表明 ,该控制器具有良好的动、静态性能 。

满足新标准ASHRAE Standard 62-1989R空调系统的实时控制

提出了通过在线检测新回风ＣＯ２浓度、室内人数动态计算模型及计算所需通风面积确定新风量的控制方案，利用动态仿真程序对１个具有８个分区的商业建筑办公室进行模拟和方案比较，结果表明带有预先通风的基于室内人数的控制方案能够满足新标准的通风要求，保证室内空气质量，且能实现节能。

单元式空气-空气型燃气压缩式热泵空调系统控制研究

燃气压缩式热泵空调系统是可充分利用低品位余热的高效环保型建筑冷热联供方案,但又是一个非线性、强耦合、时滞性强的复杂系统,以某种传递函数作为仿真模型分析控制方案的性能尚可,但不能完全了解系统参数的动态变化情况。该文建立了该系统的积分模糊控制方案,并在制热状态下对此控制方案效果进行了仿真。结果表明:该控制模型对于分析控制系统的控制效果、控制作用过程中系统性能的变化规律能够取得比较好的效果,控制方案的动态特性、稳态特性均比较理想。