浅谈变风量空调系统末端与控制

变风量的研究在美国等国家已经很成熟了，但在中国是暖通空调专业人员研究的新课题。本文简单介绍变风量系统及其优点；变风量空调末端的特点和应用场合；变风量系统温度和风量的控制及其优缺点。     

智能建筑中变风量空调系统的控制

本文分析了我国目前变风量空调系统的控制现状,依托基于BACNET技术的楼宇自控系统平台,研究提出适合工程的控制程序,并应用于某单位实验室中楼宇自控系统的编程与调试,可为变风量系统控制的工程应用提供参考。     

变风量空调系统应用探讨

本文主要介绍ＶＡＶ系统在香港地区的应用，并谈及该系统在内地的使用情况，认为只要技术水平进一步提高，ＶＡＶ系统生产成本进一步降低，ＶＡＶ系统会在国内得到普遍应用。     

变风量空调系统风机静压控制方法研究

使用空调系统模拟软件ＨＶＡＣＳＩＭ＋,研究了变风量空调系统中风机的定静压、变静压控制方法。根据模拟结果指出了风机的静压控制方法的特点是关键问题,并对定静压控制方法进行了实验验证。     

变风量空调系统新风量的控制问题

介绍了变风量空调系统新风量的研究现状，提出了目前研究的热点问题，并对几种主要新风量控制方法的研究现状、特点及适用场合进行了分析。另外，指出了变风量空调系统新风量控制设计中应特别注意的问题。     

变风量空调系统简介

近年来,随着我国对节能和建筑智能化需求的增多,变风量空调系统得到了越来越多的重视和应用。本文从起源、原理、优点、设计步骤等方面,通过比较的方式对变风量空调系统做了简单的介绍并对其发展方向做出展望。     

浅谈节能变风量空调系统

介绍了变风量空调系统的基本原理及分类,总结和分析了变风量空调系统的一些优点与不足,说明了变风量空调系统的VAV末端装置的类型,并且提出应该大力提倡应用节能潜力巨大的变风量空调系统的建议。     

变频变风量空调系统及在工程上的应用

介绍变频变风量空调系统的优势、组成部分、控制原则及运行特点,并结合实际工程中的设计实例,指出其与普通变风量系统相比较所具有的优点和不足之处。     

变风量空调系统的新风问题

以某写字楼为例,分析了变风量系统中不同分区形式对各朝向房间的人均新风量分配的影响,认为新风量分配不均的情况主要出现在冬季和过渡季,提出满足所有朝向房间人员健康要求同时能实现过渡季利用新风节能的新风量设计标准;建议在建筑设计中增加新风竖井面积,在空调外区适当增加最小新风量的取值。     

变风量空调系统设备特性研究

运用计算机仿真技术对变风量空调系统的设备特性进行了研究。空调系统在部分负荷情况下,变风量可降低风机功耗;要进一步提高VAV系统能量使用效率,降低系统能耗,尚必须调节表冷器的冷冻水量。     

变风量空调系统中风机的加权流量控制方法

分析了变风量空调系统的风机控制方法,介绍了用加权流量法控制风机的思路和方法,并将其与其他几种控制方法进行了数值模拟分析比较,结果表明加权流量法是一种控制稳定、计算简单的变风量控制方法,能方便地应用于实际工程。     

变风量空调系统的建模与控制

介绍了变风量空调系统的基本原理。结合变风量空调系统的特点,在基于被控房间数学模型的基础上,将模糊控制和常规PID控制相结合,提出了一种模糊PID控制方法并将其应用于变风量空调室温控制中。     

Energy efficient PCM-based variable air volume air conditioning system for modern buildings

This work aims at achieving enhanced energy conservation for space conditioning with the application of a new combined variable air volume (VAV)-based chilled water air conditioning (A/C) system and thermal energy storage (TES) system. The phase change material (PCM) used in this system exhibited good charging and discharging characteristics that directly helped in conserving the overall energy spent on cooling and ventilation. The present system was experimentally investigated for summer and winter climatic conditions under demand controlled ventilation (DCV) and DCV combined with the economizer cycle ventilation (ECV) to substantiate its energy savings capability. Based on the results, in the DCV and combined DCV-ECV modes, this system achieved 28% and 47% of per day average energy conservative potential, respectively, while compared to the conventional chilled water-based A/C system. Similarly, the VAV-TES system yielded an on-peak total energy savings of 38% and 42%, respectively, for the same operating conditions.     

集中空调水系统协同变流量控制策略

采用响应面分析法建立了集中空调水系统总能效与冷负荷率、室外干球温度、冷却塔风机风量、冷水流量和冷却水流量的五元二次经验模型,得到了当负荷率和干球温度动态变化时,使制冷系统总能效最高的风机风量、冷水流量和冷却水流量,从而得到了冷却塔风机、冷却水泵、冷水泵和制冷主机的功率调节方案.结果表明,协同变流量控制能有效提高空调系统的总能效.     

Energy optimized-ventilation constrained variable air volume system control

The analytical energy performance of an advanced energy optimized-ventilation constrained control approach to variable air volume systems was compared to four other controls. The other controls are either currently used or have been proposed in the literature. The advanced control demonstrated its potential to meet the ventilation requirements of ASHRAE Standard 62–1989 for every zone of the building with minimal energy consumption.

The analytical work was carried out in a single story prototypical commercial building. The building was analyzed in five US cities to provide insight into the impact of climate on the performance of the advanced control. The advanced control consumed less total energy, considerably less in some cities, than the other four controls. The advanced control provides an excellent opportunity to apply to buildings new automation equipment and software never attempted before.     

亚洲金融大厦标准办公单元变风量空调系统自控策略分析

重点分析了幕墙侧风机盘管结合变风量空调系统在主风管变静压调节过程中有效实现整体控制的运行策略。将幕墙侧风机盘管纳入变风量空调自控系统进行整体控制,避免了以往项目中同一区域2种系统独立控制时容易产生的温度失调问题,同时,采用静压设定值定步长调整法,通过简单有效的控制逻辑实现了主风管变静压调节。经过冬、夏季的运行测试,结果显示上述空调自控系统达到了变静压调节的要求,并且实现了幕墙侧风机盘管与变风量空调系统的整体控制。     

变风量空调系统发展状况

介绍了国外变风量(VAV)系统的研究和应用现状。分析了国内VAV系统研究和应用中存在的问题,指出了其发展方向。总结了变风量空调系统的发展趋势和技术关键。     

Heating control strategy for variable refrigerant flow air conditioning system with multi-module outdoor units

The heating control strategy is key technology for stable and reliable heating operation of variable refrigerant flow air conditioning system with multi-module outdoor units. The synoptic control strategy is that the host module coordinates the system operation and adjusts the operation frequency of every module based on equal frequency allocation principle for suction pressure balance among modules. The heating control model including heating frequency adjustment, module switching condition and frequency allocation model has been built. Considering the discharge pressure disturbance, a certain discharge pressure region is taken as the control objective to adjust the frequency. And considering the lag between pressure and frequency, the restriction condition of discharge pressure and a certain judgment time are introduced into the model to avoid frequent module switching. Furthermore, different frequency allocation models have been built for increase and decrease of module number. In the model, when the module number increases and evenly allotted frequency to every module is less 70 Hz, one or two certain frequencies 70 Hz are distributed to the pre-existing thermo-on module(s) and the remaining frequency is distributed to ensuing thermo-on module so as to avoid sharp frequency fluctuation and inferior heating effect. Experiments demonstrate the feasibility of the control strategy.     

住宅空调远程控制系统

介绍一套以单片机89C52和双音多频解码芯片MT8870为核心,通过公用电话网远程控制住宅空调的系统,并给出系统的硬件组成和软件设计。     

商场空调系统变频控制节能改造

3　运行结果改造于 2 0 0 0年 12月完成 ,工程于 2 0 0 1年 1月投入使用 ,经过近 1年运行 ,结果还是令人满意的。改造后功率下降很明显 ,对各个区域噪声、温度进行测定 ,结果均令人满意 ,总体满意率在 95 %以上。商场空调系统变频控制节能改造$深圳基泰投资公司@丁利军1　陆耀庆.实用供热空调设计手册.北京:中国建筑工业出版社,1993 2　顾兴蓥.民用建筑暖通空调设计技术措施(第2版).北京:中国建筑工业出版社,1996