DDC系统在空调工程中的应用

暖通空调系统的控制系统在空调运行的过程中起着重要作用，采用控制简便、灵活的直接数字化控制（DDC）系统能使空调系统达到最佳的节能状态。     

暖通空调系统的节能措施

本文针对我国暖通空调的应用现状，从室温设定值、暖通空调系统形式的选择、热能回收、可再生能源的利用等方面介绍了暖通空调系统的节能措施。     

暖通空调系统BIM工程结构体集成化设计方法探析

近年来,BIM技术在建筑工程中得到广泛应用。但在以暖通空调系统为主的机电设备领域,BIM的应用较少。BIM技术能解决暖通空调设计及施工中的信息断层问题,但因缺乏适用于暖通空调系统工程化加工及装配需求的构件开发标准,制约了暖通空调系统发展。论文针对这些问题,提出工程结构体集成化设计的工效评价方式,实现现有系统设计方式的变革,促进暖通空调系统工程更好地发展。     

通风空调系统设计中暖通空调新技术的应用

暖通空调系统往往用于商用建筑以及社会公共基础设施当中,但是近年来,随着物质生活水平的逐年提升,人们的关注焦点开始转向舒适的生活与居住环境上面,这就进一步拓宽了暖通空调的应用范围。而传统的暖通空调技术只具有采暖、通风与空气调节作用,在节能降耗、除尘环保方面较为薄弱,针对这种情况,设计与技术人员应不断转变思路,积极探索和创新暖通空调技术,在满足用户正常生活、工作需求的同时,使暖通空调的能量消耗降到最低点。因此,本文将结合CFD (计算流体动力学)技术在通风空调系统中的应用原理,针对暖通空调的新型应用技术展开全面论述。     

探究建筑暖通空调水系统安装施工技术

为了提高暖通空调使用性能,改善建筑室内居住环境,做好暖通空调水系统安装工作至关重要。本文针对建筑暖通空调水系统安装施工技术进行研究,先是简述了暖通空调工程水系统的基本特征,接着分析了水系统套管制作与安装、水管支架与吊架安装、管道水压试验、水系统管道连接安装等施工技术要点,对暖通空调水系统安装技术应用进行进一步探究,为相关人员提供了理论参考,旨在优化水系统安装技术,提高施工水平,维护建筑暖通空调水系统的稳定运行。     

节能理念下的民用建筑暖通空调设计研究

暖通空调系统是民用建筑中最主要的能耗单元之一,对暖通空调系统进行节能设计优化是降低民用建筑整体能耗水平的重要途径之一。在以往针对暖通空调系统运行的研究中发现:在民用建筑现有暖通空调系统中,推广采用节能技术最大可降低50%左右的能源消耗量,这对于促进建筑业的长期可持续发展而言是非常重要的。针对民用建筑中暖通空调系统设计存在的主要问题进行分析与概述,并基于对节能理念的应用,探讨民用建筑暖通空调系统节能设计的关键方法与策略。     

谈智能门禁系统在暖通空调系统节能中的应用

针对智能门禁系统的基本组成及功能进行了具体介绍,分别阐述了智能门禁系统在厂房采暖系统、通风系统、空调系统等不同的暖通空调系统节能中的应用,以期指导实践,促进暖通空调领域节能技术的发展。     

探究暖通空调节能技术在建筑工程中的应用

社会快速发展推动了建筑行业的进步,暖通空调的广泛应用,也造成能源消耗量急速增长,在暖通空调系统中应用节能技术可以有效减少能源消耗量,让建筑工程达到环保节能的效果。基于此,本文先针对暖通空调节能污染问题展开分析,后提出空调节能技术在工程中的具体应用。     

公共建筑暖通空调系统提高能效的措施解析

公共建筑中暖通空调系统是极为重要的一个组成部分,也是保障公共建筑应用舒适度的关键点所在,基于暖通空调系统的应用来说,其虽然较大程度上提升了人们的舒适度,但是同时也带来了较大的能源消耗和浪费,因此,本文就重点针对公共建筑暖通空调系统中能效的提高进行了简要的分析和论述。     

佛山市第一人民医院暖通空调设计

该医院建成时是当时国内最大的综合医疗单体建筑,加上2009年建设的肿瘤中心,总建筑面积达20.1万m2.简要介绍了医院暖通空调系统的设计,其中包括室内设计参数的确定以及空调冷源、水系统、通风系统、DDC自动控制系统的设计,并介绍了医院中不同场所的空调系统的选用原则及应用.分析了两管制与分区两管制水系统的使用效果,着重介绍了烧伤病房、肿瘤中心等净化空调的设计.     

北京国典大厦空调设计

该大厦是一座以商务办公为主的写字楼,对大厦的空调水系统、风系统、供暖系统、气流组织、防排烟系统和DDC自动控制系统的设计作了介绍;详细介绍了空调冷热源的选择,阐述了办公类建筑的暖通空调设计;简单介绍了公共建筑中厨房排风、排烟系统的设计,并对设计中的一些经验和教训进行了总结。     

Applying direct digital control

One particular aspect of a wide range of HVAC research at the US Center for Building Technology concerned interfacing DDC with the pneumatic system for one of the existing air handling units at the CBT building itself. Using solenoid air valves induced both positive and negative air leaks in the pneumatic system; this did not occur with motorised pressure regulators, though these produced a time delay whenever the regulator's direction of rotation was reversed. Details are given of an adaptive PI algorithm with a self-tuning regulator approach, developed at CBT and implemented on the air handler in question. From the experience, it is strongly recommended that such an algorithm should be implemented on a positional basis.     

暖通空调系统优化控制与能量管理的现状及发展趋势

分析了暖通空调优化能量消耗的特点,介绍了暖通空调控制系统基础控制器参数整定、工作点优化和能量管理的现状。根据暖通空调系统的未来需求和相关技术的发展,提出了其控制技术的发展方向。     

Applying direct digital control

One particular aspect of a wide range of HVAC research at the US Center for Building Technology concerned interfacing DDC with the pneumatic system for one of the existing air handling units at the CBT building itself. Using solenoid air valves induced both positive and negative air leaks in the pneumatic system; this did not occur with motorised pressure regulators, though these produced a time delay whenever the regulator's direction of rotation was reversed. Details are given of an adaptive PI algorithm with a self‐tuning regulator approach, developed at CBT and implemented on the air handler in question. From the experience, it is strongly recommended that such an algorithm should be implemented on a positional basis.     

An experimental system for advanced heating,ventilating and air conditioning (HVAC) control

While having the potential to significantly improve heating, ventilating and air conditioning (HVAC) system performance, advanced (e.g., optimal, robust and various forms of adaptive) controllers have yet to be incorporated into commercial systems. Controllers consisting of distributed proportional-integral (PI) control loops continue to dominate commercial HVAC systems. Investigation into advanced HVAC controllers has largely been limited to proposals and simulations, with few controllers being tested on physical systems. While simulation can be insightful, the only true means for verifying the performance provided by HVAC controllers is by actually using them to control an HVAC system. The construction and modeling of an experimental system for testing advanced HVAC controllers, is the focus of this article.     

压差电动调节阀的节能控制分析

本文分析空调变流量水系统调节过程中存在的问题,通过对空调水系统采用节能控制技术后达到的运行效果,分析节能控制技术在空调领域应用所具有的舒适性和节能性。     

民用建筑防排烟及通风空调系统防火设计中的几点问题探讨

针对民用建筑工程设计中遇到的防排烟及通风空调系统防火问题,分析了现行国家标准关于内走道排烟、通风空调系统防火阀设置、地下室及半地下室竖向疏散通道正压送风系统设置等的相关规定,并提出了个人见解。     

空调系统控制的一种动态优化技术

为建筑空调系统控制提出一项动态的优化技术。在一个指定期间内，运用该算法，能得到使目标函数(例如运行成本或者峰值能耗)最小的房间温度曲线。该算法也能给出HVAC设备的最佳开、关时间。本文包括建筑热特性的模拟，优化技术和实例研究。     

A practical algorithm for diagnosing control loop problems

This paper describes an algorithm for detecting and diagnosing poor performance in feedback control loops. The performance of the control loop is assessed based on criteria derived from parameters that can be estimated from superficial knowledge of the controlled process. The algorithm can distinguish between three types of control problems: oscillatory response, sluggish response, and plant failure. The method is particularly applicable to heating, ventilating, and air-conditioning (HVAC) systems where linear (PI) control law is normally used despite the existence of often quite non-linear operating characteristics. In these systems, the control performance varies as the plant is exercised across its operating range. In practice, periodical re-tuning of HVAC control loops during the yearly load cycle may be necessary in order to obtain consistent control performance. The algorithm presented in this paper can act as the basis for determining when re-tuning is necessary in addition to detecting plant failure. Potential advantages of detecting control problems in HVAC systems are energy savings, reduced maintenance costs, and improved thermal comfort conditions. The paper describes the techniques comprising the algorithm and presents results from tests carried out on a simulated air-handling unit (AHU).     

Application of an energy management and control system to assess the potential of different control strategies in HVAC systems

The significant and continuous increment in the global electricity consumption is asking for energy saving strategies. Efficient control for heating, ventilation and air-conditioning systems (HVAC) is the most cost-effective way to minimize the use of energy in buildings. In this framework, an energy management and control system (EMCS) has been developed to schedule electricity end-uses in the campus of the Universidad Politécnica de Valencia (UPV), Spain. This paper presents an evaluation performed by using the EMCS of different control strategies for HVAC split systems. It analyzed the effect of different schedules for a common air-conditioning device and demand response strategies are tested in several situations. The economic saving is calculated taking into account the electricity contract clauses. Finally, a test is made for the control of a group of similar devices in order to reduce the maximum peak power in consumption and to obtain a flexible load shape with the HVAC loads. The studies are then extrapolated to a larger system, the whole University campus, for which energy and economic savings are quantified.