EEV

Research on the Flow Character of EEV in Air Conditioner

空调用电子膨胀阀流量特性研究

This paper introduces the construction , control and experimental analysis of the electron expansion valve ( EEV ) .

本文详细介绍了电子膨胀阀的结构、控制特点，并进行了试验分析。

Mathematical Modeling and Simulation of EEV 's PID Control System in Direct-expansion Solar Assisted Heat Pump

直膨式太阳能辅助热泵电子膨胀阀控制系统数学建模与仿真

EEV should be selected for various refrigeration systems according to the thermal properties of refrigerants ;

对于不同工质的冷藏集装箱制冷系统，电子膨胀阀应该根据具体制冷剂的热力性质选取；

So it is considered that the prospect of EEV in the region is very broad ;

认为保定地区经济沟建设前景广阔；

The relation between opening and outflow of EEV ( Electronic expansion valve ) was studied through the experiment in this paper .

本文通过实验研究了电子膨胀阀流量与开度的关系。

But now a British company called EEV has come up with a computerized video system that can do it all automatically .

但是现在一家英国公司呼叫EEV已经提出能自动地做它全部的一个被用计算机处理的电视系统。

The dynamic response to the step change of inverter-aided compressor speed , opening of the EEV and air fan speed is studied .

通过仿真计算对一拖二系统随变频压缩机转速、电子膨胀阀开度以及回风风机转速改变的动态特性进行研究分析；为系统的实时控制打下基础。

Basing on analyzing the characteristic of EEV and running rule of refrigerating system in detail , it designs precise online control of inverter compressor .

在对电子膨胀阀的特性及制冷系统的运行规律的认真分析基础之上，设计了变频压缩机的精准在线控制。

PID and Fuzzy controllers are using in the experimentation based on the simulation results of the PID , fuzzy and fuzzy self-tuning PID controllers and the driven method for EEV .

针对电子膨胀阀步进电机驱动方式和本文的仿真结果，应用增量式PID和模糊控制方法进行实验分析。

Through analysis on the geometry of electronic expansion valve ( EEV ) flow passage , the working passage of EEV was simplified to a series of short nozzles .

通过对膨胀阀内节流工作段几何结构的分析，将其简化为短喷嘴结构。

By applying black box theory inlet pressure , inlet subcooling , outlet pressure and valve opening are selected as influence factors to flow coefficient of electronic expansion valve ( EEV ) .

根据黑箱理论提出将阀前压力、阀前过冷度、阀后压力和膨胀阀流通面积作为膨胀阀流量系数的影响参数。

The indoor temperatures were taken as the controlled variables to regulate the openings of individual EEV and the suction pressure was taken to modulate the speed of compressor .

以各室内温度和吸气压力为被控变量分别调节电子膨胀阀开度和压缩机转速，提出了一种鲁棒自适应两级模糊比例-积分-微分控制器并进行了仿真。

The step response method of the outlet superheat of evaporator is measured by conducting experiments , and dynamic model of EEV is established by LSE ( least square estimation ) .

通过阶跃响应实验法，利用最小二乘法建立燃气机热泵蒸发器&电子膨胀阀系统的过热度响应动态模型。

Electronic expansion valves ( EEV ) are throttling components in refrigeration system . It can adjust the flow of refrigerants , throttle step-down , and control superheat in system .

电子膨胀阀（EEV）是制冷系统中的节流元件，它在系统中的主要作用是调节系统制冷剂流量、节流降压及控制过热度。

The thermostatic expansion valve ( TEV ) is replaced by the electronic expansion valve ( EEV ) to increase the energy efficiency ratio ( EER ) in computer room air conditioner ( CRAC ) .

为了提高机房空调能效比，传统的热力膨胀阀正逐步被电子膨胀阀取代。

Based on the model , simulation is conducted to study the laws of the VRV system by varying its working parameter such as speed of compressor , openness of EEV , air volume of indoor units and indoor room temperature .

利用所建立的数学模型，通过仿真的方法，研究VRV系统在调节作用及拢动作用下，系统的各热力参数变化规律。本文着重于对系统中电子膨胀阀开度、压缩机转速与吸气压力；

The open degree and flow characteristics of control system of EEV are revealed . Steady-state response characteristics of the negative feedback control of flow of EEV and the influence of the steady-state output system with gap characteristics is obtained through the system simulation analysis .

揭示了电子膨胀阀数字控制系统开度与流量特性；通过系统仿真分析获得电子膨胀阀的流量负反馈控制的稳态响应特性与间隙特性对系统稳态输出的影响规律。

The driving circuit of stepping-motor with the function of over-load protection and short-circuit protection is established ; the accurate control characteristic of open degree of EEV is realized by the way of driving stepping motor directly and four-phase-eight-pat controlling pattern .

设计了具有过载保护与短路保护的步进电机驱动电路，采用PLC直接驱动步进电机驱动方式与四相八拍控制方式，实现对电子膨胀阀开度的精确控制。

This thesis analyzes all kinds of throttle components , points out the advantage of adapting EEV , and analyzes the start-up and the discharge characteristics of EEV , and dynamic response of refrigeration systems when the opening degree of EEV is changed , etc.

本文对比分析了冷藏箱制冷系统各种节流元件的特点，指出电子膨胀阀应用的优势，同时分析了电子膨胀阀的启动特性、流量特性以及系统在阀开度变化时的动态响应。