大型邮轮的HVAC状态监控及运行管理系统设计

基于数据采集和监控、设备健康管理等技术设计了暖通风空调系统监控管理系统(MCMS),实现了对全船HVAC设备的状态监控和运行管理,具备数据采集、传输、HMI可视化监测(监测点近30000个,数据刷新时延小于1 s)、存储管理(历史数据可存储6个月),远程控制、故障诊断报警和节能优化控制等能力。系统具有集成度高、冗余可靠、功能丰富、可扩展性强等特点。

船用HVAC风管减隔振工艺措施试验及分析

某船典型环境下,HVAC风管在管内风速风量的激励下,产生明显振动。采用安装橡胶减振元件及消音装置等措施后,HVAC风管振动下降最大达10%以上。本试验研究风管安装相关措施对管路振动的影响,发现橡胶垫的厚度、硬度等材料参数对风管路振动传递影响呈复杂关系。其中,橡胶垫的减隔振效果随着厚度的增加不断提升,最终趋于稳定效果,并且软管径向安装偏差对管路各方向振动亦有较大影响,为该型船减隔振措施提供一定参考。

运行策略信息缺失条件下的HVAC系统设备模型校准方法

性能准确的HVAC系统仿真模型对于研究建筑需求响应具有重要意义,模型校准是提高仿真结果可靠性的关键环节,但现实中会遇到运行策略信息缺失的情况,严重影响了校准结果的有效性。本文提出了一种适用于实际运行策略信息缺失条件下的模型校准方法,在设备性能优化校准前,增加运行策略校验环节,以皮尔逊相关系数作为评价指标判断运行策略是否准确。利用该方法可以在实测数据集中识别出运行策略准确数据集,以此为基础进行设备性能优化校准,从而确保校准结果的有效性。以某制冷站的冷却塔模型校准为例,验证了所提方法的校准效果。该方法可推广于其他HVAC设备模型的运行台数策略验证与名义性能参数校准中。

考虑客流变化的机场航站楼HVAC系统动态控制仿真研究

机场航站楼是以建筑结构复杂、人流量大且流动速率高等为特征的重要交通基础设施,其暖通、通风和空调系统(HVAC)通常是预先安排的,无差别的控制大面积区域,忽略了航站楼内客流分布的不均匀特征。提出客流模拟和建筑能耗模拟相结合的方法,通过智能体仿真建立航站楼的客流模型,用所得到的客流数据动态控制航站楼的温度与新风量,并以哈尔滨太平国际机场为案例进行研究,从节能效益和热舒适性进行分析。研究结果为未来机场航站楼的HVAC系统的设计和优化提供支持,为机场能源管理提供更多可能。

高温工业环境下HVAC系统能效提升策略

高温工业环境下HVAC系统面临高能耗、效率低下和维护成本高等挑战。为提升能效,可采用高效节能设备、热回收技术和相变材料等创新技术;系统优化设计包括分区控制、智能通风系统和绝热保温;智能控制与管理系统结合物联网技术、预测性维护系统和能源管理系统,实现精准控制和优化运行。这些策略不仅能显著降低能耗,还能提高系统稳定性和可靠性,为高温工业环境HVAC系统的可持续发展提供了有效解决方案。

HVAC(Heating,Ventilation and Air Conditioning,空气调节系统)现场设备——市场份额分析、行业趋势与统计

2024年HVAC(Heating,Ventilation and Air Conditioning,空气调节系统)现场设备市场规模预计为211.3亿美元,预计到2029年将达到287.2亿美元,在预测期内(2024-2029年)复合年增长率为6.3%。新冠肺炎疫情对暖通空调行业产生了重大影响,由于封锁限制和企业避免投资新设备,全球许多建设项目被迫暂停。

HVAC Optimal Control Based on the Sensitivity Analysis:An Improved SA Combination Method Based on a Neural Network

Aiming at optimizing the energy consumption of HVAC,an energy conservation optimization method was proposed for HVAC systems based on the sensitivity analysis(SA),named the sensitivity analysis combination method(SAC).Based on the SA,neural network and the related settings about energy conservation of HVAC systems,such as cooling water temperature,chilled water temperature and supply air temperature,were optimized.Moreover,based on the data of the existing HVAC system,various optimal control methods ofHVAC systems were tested and evaluated by a simulated HVAC system in TRNSYS.The results show that the proposed SA combination method can reduce significant computational load while maintaining an equivalent energy performance compared with traditional optimal control methods.

MAQMC:Multi-Agent Deep Q-Network for Multi-Zone Residential HVAC Control

The optimization of multi-zone residential heating,ventilation,and air conditioning(HVAC)control is not an easy task due to its complex dynamic thermal model and the uncertainty of occupant-driven cooling loads.Deep reinforcement learning(DRL)methods have recently been proposed to address the HVAC control problem.However,the application of single-agent DRL formulti-zone residential HVAC controlmay lead to non-convergence or slow convergence.In this paper,we propose MAQMC(Multi-Agent deep Q-network for multi-zone residential HVAC Control)to address this challenge with the goal of minimizing energy consumption while maintaining occupants’thermal comfort.MAQMC is divided into MAQMC2(MAQMC with two agents:one agent controls the temperature of each zone,and the other agent controls the humidity of each zone)and MAQMC3(MAQMC with three agents:three agents control the temperature and humidity of three zones,respectively).The experimental results showthatMAQMC3 can reduce energy consumption by 6.27%andMAQMC2 by 3.73%compared with the fixed point;compared with the rule-based,MAQMC3 andMAQMC2 respectively can reduce 61.89%and 59.07%comfort violation.In addition,experiments with different regional weather data demonstrate that the well-trained MAQMC RL agents have the robustness and adaptability to unknown environments.

Development of a Bias Compensating Q-Learning Controller for a Multi-Zone HVAC Facility

We present the development of a bias compensating reinforcement learning(RL)algorithm that optimizes thermal comfort(by minimizing tracking error)and control utilization(by penalizing setpoint deviations)in a multi-zone heating,ventilation,and air-conditioning(HVAC)lab facility subject to unmeasurable disturbances and unknown dynamics.It is shown that the presence of unmeasurable disturbance results in an inconsistent learning equation in traditional RL controllers leading to parameter estimation bias(even with integral action support),and in the extreme case,the divergence of the learning algorithm.We demonstrate this issue by applying the popular Q-learning algorithm to linear quadratic regulation(LQR)of a multi-zone HVAC environment and showing that,even with integral support,the algorithm exhibits bias issue during the learning phase when the HVAC disturbance is unmeasurable due to unknown heat gains,occupancy variations,light sources,and outside weather changes.To address this difficulty,we present a bias compensating learning equation that learns a lumped bias term as a result of disturbances(and possibly other sources)in conjunction with the optimal control parameters.Experimental results show that the proposed scheme not only recovers the bias-free optimal control parameters but it does so without explicitly learning the dynamic model or estimating the disturbances,demonstrating the effectiveness of the algorithm in addressing the above challenges.

An Approach to Optimize Multi-family Residence HVAC Systems Using Digitalization

As mentioned by National Geographic(2017),70%of world’s population is expected to live in large apartment buildings by 2050.Today,buildings in cities generate 30%of world’s greenhouse gas emission or GHG(National Geographic,2017).Major urban centers are committed to reducing greenhouse gases by 80%by 2050(IEA,2021).However,achieving such goals in rental properties is not easy.Landlords are hesitant to use high-efficiency technologies because,typically,tenants pay the utilities bill.However,that situation is rapidly changing.For example,New York City like other US cities,is considering a carbon cap on all large buildings(Local Law 97,2019).That means landlords will pay a carbon penalty if the building’s carbon footprint exceeds certain threshold no matter who uses that carbon.The Pacific Northwest National Laboratory(PNNL)has received funds from DOE(US Department of Energy)with the collaboration of a commercial partner to address emerging energy efficiency market opportunity in multi-family or rental housing as discussed above.It has partnered with a large national real estate owner in order to test a novel energy optimization method at a rental property in Tempe,Arizona.By using a seamless-integrated method of acquiring building’s operating data,the optimization approach essentially resets setpoints of different energy consuming equipment such as chillers,boilers,pumps,and fans.Data-driven optimization approach is pragmatic and easily transferrable to other buildings.The authors shall share the problem background,technical approach,and preliminary results.

极地LNG模块E-House HVAC系统设计

暖通空调(Heating,Ventilation and Air Conditioning,HVAC)系统是液化天然气(Liquefied Natural Gas,LNG)模块E-house的重要支持系统,也是维持LNG模块持续运行的关键。位于北极圈内的俄罗斯LNG开采、处理、运输模块,需要承受超低温极端恶劣工况,满足严格的防火防爆,及诸多俄罗斯本地法规要求。因此,通常的HVAC系统设计已无法满足其使用要求,亟待设计一套适用于极地LNG模块的HVAC系统:在系统计算上充分考虑极端运行环境因素,对比传统传热与逐时分析程序(Hourly Analysis Program,HAP)计算方法,介绍散热量选择和风量计算方法。此外,解析俄罗斯本地法规的特殊要求并提供相应的解决方案。研究成果可为极地LNG模块E-house的HVAC系统设计提供一定参考。

浅谈HVAC系统对住院患者健康的影响

论述了医院建筑供暖、通风和空调系统(HVAC)相关的室内环境参数对住院患者的影响。医院作为综合性的大型医疗场所,存在多种疾病源并存的风险,同时易感人群高度集中。对于空气暴露下患者的治疗及预后情况,感染源的风险防范,以及气候条件对于患者的不利影响都是医院建筑功能使用过程中面临的十分严峻的问题。综合工程项目经验,建筑HVAC系统的应用是一种对医疗环境很有效的适应措施,可以减轻环境风险以及气候变化对卫生医疗保健系统的不利影响。

Preliminary Research on Water Supply,Drainage,and HVAC Equipment in Shanghai Historic Buildings During the Northern Warlord Period

During the Northern Warlord Period(1912–1928),the construction industry in Shanghai underwent robust development.As an integral element of buildings,equipment served both functional purposes and stood witness to the evolution of the economy and society,thus earning its place as part of the architectural heritage.However,due to various reasons,there are many loopholes in the protection of these building equipment.This paper examines the development of building equipment in Shanghai during the Northern Warlord Period,using water supply,drainage,and heating,ventilation,and air conditioning(HVAC)systems as examples.Through historical context analysis,it summarizes this development from a social-spatial perspective,infers the reasons behind it,and analyzes the importance of preserving such equipment,considering both past and present viewpoints.In this research,the importance of protecting historical building equipment is emphasized,which aims to give people a deeper understanding of their cultural value,and suggests that scholars conduct more practical research on their protection.

基于先验知识的HVAC系统深度Q网络控制方法

强化学习方法在近年来被逐渐尝试应用于工程控制之中,并且展示出其强大的控制能力和潜力。强化学习算法虽然具有较好的控制性能,但是其控制策略的收敛需要建立在一段时间后的训练上,而这段时间在工程应用上可能会造成一些浪费。为了解决这一问题,提出了基于先验知识的DQN对暖通空调(HVAC)系统中的冷却水系统进行控制,将先验知识引入DQN算法的前期训练中,以减少训练时间,加速收敛,节约成本。基于先验知识的DQN算法不仅能够对系统进行有效的控制,并且能够比DQN更早地实现节能。

基于模糊线性化预测模型的HVAC系统温度控制

针对暖通空调(HVAC)系统难以控制的问题,提出一种基于m ax-product推理的M am dan i模糊模型预测控制策略.首先利用一步模糊预测模型的结构分析得到其解析表达式,获得系统在k+1时刻的线性化预测模型;然后基于模糊线性化模型进行模型预测控制器设计.对HVAC系统的仿真和实验结果表明,该算法是一种跟踪性能好且鲁棒性强的有效控制算法.

HVAC风道空气泄漏检测方法研究

介绍了一种用于自动控制检测采暖通风与空调(HVAC)总成及风门的空气泄漏量的检测方法。在HVAC接口的上游建立一个稳压室,利用自动检测与控制方法使稳压室的空气压力稳定在一定范围内,通过稳压室上游接口处的流量传感器来检测HVAC的空气泄漏情况。与传统检测技术相比,该检测方法具有灵敏度高、压力控制准确、自动化程度高、使用方便等特性。

浅析HVAC系统的加工设计

为使HVAC系统加工设计及图面标准工作逐步完善统一、更便于现场施工及管理、提高工作质量和效率，根据加工设计的特点及近年内现场工作的经验，总结出对HVAC系统加工设计的一些方法。

HVAC系统的碳足迹分析及环境评价指标

介绍了HVAC系统碳足迹的分析方法,提出了评价系统对环境影响程度的两个指标:碳排量和单位输出能量的碳排量。前者用作同一区域的多种设计方案的评价指标,后者用作任何系统的环境影响评价指标。这两个指标可作为规划阶段不同系统设计方案的环境影响评价指标,也可作为对运行系统碳排量监测的理论依据。另外,提出了设定HVAC系统的基准碳排量的思想。

HVAC领域相变贮能研究的现状与进展

总结了相变传热的特点及求解方法 ;相变墙板的研制以及使用效果方面的研究现状 ;相变在供暖、空调系统中的应用 ;相变贮能技术在HVAC中应用的诸多优势。提出了HVAC领域相变贮能技术今后的研究方向。

临时避难间HVAC系统防火设计

介绍了海洋石油平台临时避难闻HVAC系统防火设计的基本方法。主要介绍了防火风闸设置原则；正压控制的设计原则和方法；楼梯问的通风设计以及紧急状态下HVAC系统的运行逻辑设计。