1.DDC控制器的费用应用

2.求强人翻译英语,给200分.

联网型风机盘管控制器怎么接线_联网型风机盘管控制器

变风量空调系统(VAV)控制原理  变风量控制器和房间温控器一起构成室内串级控制,用室内温度为主控制量,空气流量为控制量。  变风量控制器按房间温度传感器检测到的实际温度,与设定温度比较差值,以此输出所需风量的调整信号,调节变风量末端的风阀,改变送风量,使室内温度保持在设定范围。  同时,风道压力传感器检测风道内的压力变化,用PI或者PID调节,通过变频器控制变风量空调机送风机的转速,消除压力波动的影响,维持送风量。  变风量空调系统区别于其它空调形式的优势主要在以下几个方面: 1、 节能  由于空调系统在全年大部分时间里是在部分负荷下运行,而变风量空调系统是通过改变送风量来调节室温的,因此可以大幅度减少送风风机的动力耗能。据模拟测算,当风量减少到80% 时,风机耗能将减少到51%;当风量减少到50%时,风机耗能将减少到15%。全年空调负荷率为60% 时,变风量空调系统(变静压控制)可节约风机动力耗能78%。  2、 新风作冷源  因为变风量空调系统是全空气系统,在过渡季节可大量用新风作为天然冷源,相对于风机盘管系统,能大幅度减少制冷机的能耗,亦可改善室内空气质量。  3、 无冷凝水烦恼  变风量空调系统是全空气系统,冷水管路不经过吊顶空间,避免了风机盘管系统中令人烦恼的冷凝水滴漏和污染吊顶问题。  4、 系统灵活性好  现代建筑工程中常需进行二次装修,若用带VAV空调箱装置的变风量空调系统,其送风管与风口以软管连接,送风口的位置可以根据房间分隔的变化而任意改变,也可根据需要适当增加风口。而在用定风量系统或风机盘管系统的建筑工程中,任何小的局部改造都显得很困难。  5、 系统噪声低  风机盘管系统存在现场噪声,而变风量空调系统噪声主要集中在机房,用户端噪声较小。  6、 不会发生过冷或过热  带VAV空调箱的变风量空调系统与一般定风量系统相比,能更有效地调节局部区域的温度,实现温度的独立控制,避免在局部区域产生过冷或过热现象。  7、 提高楼宇智能化程度  用DDC数字控制的变风量空调系统,可以实现计算机联网运行,接入到楼宇自控系统中,从而提高楼宇智能化程度。  8、 减少综合性初投资  由于增加了系统静压控制以及VAV空调箱等环节,设备控制上的造价会有所提高。但由于变风量空调系统可以根据冷热负荷的分布,使送风量在建筑物内各个控制区域间平衡转移,从而使系统的设计总送风量减少,因此可以减小空调系统的设备容量,系统综合性初投资不一定会增加,甚至可以降低。  9、 变风量空调系统结构简单,维修工作量小,使用寿命长。

DDC控制器的费用应用

HFCF是特灵公司新一代的环保节能型风机盘管,用最新的低噪声控制技术,最新开发的波纹式亲水膜翅片以及先进的制造

工艺。具有一系列的优点:

低噪

用最新设计的低转速前倾多翼

宽叶轮离心式风机,叶轮经动、

静平衡校正,运行平稳。

分离电容型电机配以永久润滑封

闭轴承,转动平滑、高效。

消声效果良好的保温材料和精巧

的箱体结构设计进一步保证了机

组的超低噪音。

控制独到

机组可配合特灵新型TM50液晶温

控器Trane ICS系统相容。TM50

温控器具有二通阀连锁、节能模式、

联网群控等一系列独特的控制选项

和功能,满足不同场合的控制需求。

安装维护方便

超薄机身,机组高度仅为230mm,节省安装

空间。

结构设计独特,方便现场盘管安装、变向以及

风机叶轮的维护。同时可提供预装的水阀,省

工省时,大大减少水阀漏水的可能性。

独有的排水阀设计,便于客户排空盘管内的存

水,防止冬季盘管冻裂。

直流调速(选项)

直流无刷电机DCBL与传统的AC电机相比,无

论在效率、超低速噪音、节能等各方面均具有

巨大优势。

在实际使用中,机组控制器可以根据室内温度

和设定温度之间的偏差进行PID计算,无级调

节风量,控温精准的同时大大降低能耗和噪音。

高效

盘管用最新研制的波纹式亲水

膜翅片,换热高效的同时,提高

防飞水和防腐能力。

运用先进的机械涨管工艺,加强

铜管与翅片接触的紧密度。

配合超宽叶轮使换热更加充分,

使单位输入功率制冷量超过国内

外同类机组的水准。

型号齐全

9个型号, 覆盖

200~2400CMH

风量。产品型号

更加齐全、分档

更加合理,更好

的满足客户的需求。

保温绝热

用一次冲压成

型的整体式凝结

水盘,避免泄漏,

杜绝补丁。

保温经过特殊设

计和加工, 更趋

完善。无需在水

盘上使用镙钉固

定, 防止水盘锈

蚀的可能。

2

控制可选件控制说明

液晶温控器TM50

特灵数码出风口TDG( 线控或遥控)

机械温控器TM60 水阀WCV

选项

2管制

4管制

DCBL TDG UV

控制

求强人翻译英语,给200分.

在建筑中安装全终端DDC系统的费用正在不断下降中,多数只有很少甚至没有费用的增加。考虑到终端DDC系统的众多优越性,这些费用比传统系统更具效率,如果恰当地使用DDC系统,它的费用可在短期内回收。

DDC适用的建筑

现多数建筑都可适用DDC系统,包括:办公大楼、学校、医院、宾馆以及工业建筑。

DDC系统可安装于各种规格的建筑中,在小型建筑中其特别优点是其遥控显示器可装于管理服务公司中,在大型建筑中,其优点是可通过中心管理系统管理,从而比单个管理更节省人力和能源。

DDC系统可用于建筑改造

大多数建筑可用DDC系统进行改造。通常高效率地改造和提高控制系统应在改进和整修机械系统时进行,有时也可能由于原控制系统已陈旧废弃或由于客户舒适性要求的影响等而改造控制系统。多数场合,旧系统中部分设备可被重新使用并发挥更高的效率,最新的DDC系统允许在改造一个系统,一个系统安装而不必安装中心控制室,各个系统可独自操作,直至将末端设备联网至工作或安装中心控制室。这就使改造和设计具有高度灵活性。

DDC系统适合于大部分机械系统

典型的有:变风量系统(VAV)、热泵、风机盘管、新风机组空调箱、空气处理系统、通风机系统和建筑中心机械设备及附加设备均可连接到DDC系统,提供安全保护、使用寿命保护、显示、指示灯等信号。

DDC系统可用于多种建筑间的联网

中心控制室可通过ADSL利用宽带网络调节控制多栋大楼,中心计算机可接收到远距离往来各种警报、信号,并在中心控制室操作而在各处完成各种必要功能。

相距不远的几栋大楼可通过以太网络联网,操作终端可置于其中一栋建筑,它的操作信号可传送至网络的其它终端,这对于办公大楼群和学校还是十分理想的。

DDC系统可提供过往使用纪录

安装在各区域(房间)的传感器可由客户调节改变该区域内设定点,当设定变化时,空气处理系统或部分机械系统相应动作,该系统还可提供每月各客户的操作纪录清单。

DDC系统能协助顾问工程师

顾问工程师可很大地受益于DDC系统。以大楼建造开始,工程师办公室就可通过电话线了解到大楼的许多情况,他可按控制系统提供的情况对有关机器进行检修而不必走出办公室,这样在工程进行时就可节省很多费用。

DDC系统对服务和管理公司的益处

安装在大楼内的DDC系统可以及时监控大楼的操作,对出现的问题迅速作出反应,并取有效措施。该系统还可通过远程电讯设备联系,并从大楼接收信号,大楼的实际操作可由远处监控,并改变设定点、时间表,甚至控制软件。

这样在不是重要问题或要改进时,就可节省昂贵的旅费了。当维修人员需要前往时,他也可通过联网预测故障原因,以便到达现场后有了解决问题的方法,这样可大大提高他的工作效率,并降低客户的不满程度。

DDC系统控制设备与机械系统设备之差异

DDC系统可及时控制和显示正常装备的各种设备,包括:指示灯、环境喷头、门锁等。将这些设备接于DDC系统中,可提供使用者改变时间表的方便方法。

1 Summary

1.1 INTRODUCTION

With the constant development of China's economy, a high degree of information-based society, the new high-tech technology lied to all aspects of making intelligent has become a development trend. Tend to be intelligent automation system equipment from the start. In this paper, we present for the graduation project "intelligent small central air-conditioning," explained PLC control of Intelligent Design and central air-conditioning (Freezing Point) systems.

1.2 system and process Introduction

Is introduced as follows: We he this in the design, there are two central air-conditioning system, cooling water pump from the Big Three, three chilled water pump, a cooling tower fan, two chiller comprising two sets of major equipment such as refrigeration system (due to system Small, large power cooling towers, laboratories, etc., the system of the usual two sets of refrigeration system different from the two chiller only choose a cooling tower, roved by the calculation, this does not affect their performance) is one chiller Complete sets of equipment manufacturing plant supply. According to this design laboratory requirements, we selected the five full-2 * closed compressor chiller. It is based on general principles and laws of the air-conditioning, such as automatic control by the microprocessor. Chiller from the compressor, condenser and evaporator components. Compression of the refrigerant compressors, compressed into the refrigerator condenser, cooling water cooling, a liquid, precipitation heat away from the cooling water and cooling Tarja discharged into the atmosphere. Liquid refrigerant from the condenser into the evaporator evaporation absorb heat, chilled water cooling and chilled water fan coil absorbed into the cold air in the heat. This cycle of it, to bring out the indoor heat to reach the objective of reducing the ambient temperature. Therefore, the central air-conditioning refrigeration system for process control requirements:

(1) for the measurement of chilled water flow and return water temperature, thus calculate the actual air-conditioning cooling load, according to the actual cooling load chiller to determine the number of Taiwan Open, the best energy-sing status.

(2) the procedures for equipment linked: Start: cooling tower fan - cooling water pump - chilled water pumps - chiller. Stop: chiller - chilled water pumps - cooling water pump - the cooling tower fan. When one of the cooling water pump / chilled water pump failure, the backup cooling water pump / chilled water pump will automatically enter the workforce.

(3) measurement system for chilled water pipes to the pressure △ P = P1-P2 control of their bypass valve (TV) openings, to maintain the pressure.

(4) because we designed this lab aims to give students a more vivid image of the study and understanding of central air-conditioning system, so the design process, we will take into account the ropriate and important position to facilitate the installation of observation refrigeration Agent or the peep-flow situation.

1.3 PLC theory and lication

Central air-conditioning refrigeration system control are three kinds of control: the early relay control systems, direct digital controller DDC and the PLC (PLC) control system. Relay control system because of the high failure rate, the system complicated, the obvious shortcomings of higher power has been gradually eliminated by the people, direct digital controller DDC Although there he been very intelligent in the development. However, due to DDC its own anti-jamming capability and step-by-step grade structure and the limitations of limiting the scope of its lication. On the contrary, PLC control system with its reliable operation, use and maintenance are very convenient and anti-interference capability and high-speed network for the new structure of these significant advantages to gradually wide range of lications.

PLC is a computer in a family. In the last century after the invention of being, in machine tools, various lines of transportation machinery, power generation, chemical, and electronics industries of electrical control equipment has been widely used, early PLC, known as Programmable logic controller (Programmable Logic Controller), that is referred to as the PLC.

PLC is a powerful, reliable, easy maintenance, and so many advantages. The traditional relay circuit, it is difficult to achieve complex logic functions and the digital control, but also to achieve a certain amount of logic control not only the design cumbersome and difficult to upgrade and prone to failure, maintenance complex, now has been great Medium-control equipment abandoned by the system. The PLC is being widely used and he been gradually replaced the relay circuit logic control. With the leap in science and technology development, PLC also has been continuously improved and strong, while its functions and greatly exceeded the scope of control logic, such as communication and networking functions, such as self-diagnosis. So today we he such a device known as programmable logic controller, but we still referred to such devices used for PLC.