采用电控型变排量压缩机的汽车空调制冷系统的容量控制研究

介绍了一种新型的以电动控制阀为执行器的变排量压缩机，并从压缩机的变排量机理、系统的稳定性、容量控制方案和控制算法等方面对汽车空调制冷系统变容量控制问题进行了理论和实验研究。指出作为一种新型容量调节元件，电动控制型变排量压缩机弥补了以往制冷系统出现的车室温度波动大、蒸发器易结霜和系统振荡的缺点，有极好的应用前景。     

车用发动机机油冷却器流动的数值模拟研究

应用FLUENT软件对车用叉流板翅式机油冷却器两侧流体的流动进行了数值模拟,紊流模型采用标准的K ε湍流模型,翅片侧采用多孔介质模型进行简化。结果表明,油侧的流量分配比较均匀,而水侧很不均匀,为叉流板翅式机油冷却器的设计改进指明了方向。     

电动车热泵空调系统的设计分析

对比分析电动车热泵空调系统同燃油汽车空调系统的区别,比较采用不同制冷剂和压缩机电动车热泵空调系统,提出开发适合我国国情的高效节能电动车热泵空调的设计方法。     

轿车空调全自动控制器的研制

结合帕萨特B5轿车空调系统，采用电子膨胀阀代替热力膨胀阀作为节流机构，开发研制了基于单片机的轿车空调全自动控制器。将电子膨胀阀和变排量压缩机结合起来，实现了轿车空调多输人多输出的控制方式及车室内温度的实时控制。介绍了空调全自动电子控制器的硬件模块和软件设计。     

应用模糊控制器控制轿车空调制冷及风道系统

本文应用状态反馈模糊控制方法对轿车空调系统中的电子膨胀阀和温度混合风门进行控制来调节轿车车室内温度，在车速变化和热负荷变化的扰动下实现了车室内平均温度的自动控制，为最后轿车空调自动控制系统的产品化提供了良好的基础。     

Experimental Study of the Controlling Characteristics of Inverter-Driven Multi-type Air Conditioner

The controlling algorithm was studied for the inverter-driven multi-type air conditioner using electronic expansion valve (EEV) in outdoor unit. The performance of inverter-driven air conditioner with two different units was investigated by varying the outdoor ambient temperature and compressor speed. Based on the test results, the effect of EEV opening on the indoor unit exit superheat was discussed. For the specified outdoor ambient temperature scope and the EEV opening, the superheats of indoor units decrease with the outdoor ambient temperature rising. Improper distribution of refrigerant into each indoor unit will causes excessive superheat difference between two indoor units. Suggestions were then given for the controlling of the superheat.     

Dynamic Simulation and Performance Investigation of No-Frost Refrigerator： Part Ⅱ System Simulation and Performance Analysis

The methodology for modeling no-frost refrigerator is described based on the component models developed in Part I, and then, system simulation is applied to a BCD-235W refrigerator-freezer (RF). Experiments are carried out to study “pull-down” and steady-state performance of the RF, and to determine how the experiment and simulation temperature stack up against each other. Good match is found between simulated and measured results for the “pull-down” period. For the steady-state period, the simulation results are also found to agree well with experiment ones except for the temperature profiles of the refrigerator compartment (RC) and freezer compartment (FC). The average temperature and the energy consumption errors between measurement and simulation are less than 10%. Although the model can not reflect the non-uniform air temperature fields in the RC and FC, the variation range and periodicities of the temperature correlate well between the simulation and experiment. We conclude that such a model is valid for investigating the performance of no-frost refrigerator.      

Dynamic simulation and performance investigation of no-frost refrigerator: Part I mathematical model

A dynamic approach for the modeling, simulation and analysis of no-frost Refrigerator (RF) is discussed. In Part I, the complex interactions among the components in the cooling system are analyzed in detail, based on which the modeling simplifications are proposed. Then, the mathematical models for the evaporator, cabinet and duct-fan are presented. The whole system is divided into two subsystems—refrigerant cycling system and air cycling system. In order to simplify the model, two closed-loop systems are broken into the compressor component and the evaporator component, respectively. A general distributed parameter model is employed for evaporator with homogeneous flow to simplify the two-phase evaporating flow region. The z-transfer function model is used to describe the cabinet load. Computational fluid dynamics (CFD) method is employed to obtain the pressure drop and flow rate curve of the duct-fan model.

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中小型制冷装置用膨胀阀性能对比研究

针对热力膨胀阀、步进电机型电子膨胀阀和电磁阀型电子膨胀阀，进行了多个系统运行实验研究。结果表明自行开发的电子膨胀阀和控制器性能价格比高，与国外同类产品相比，实际的控制效果也有较明显的提高。     

轿车空调蒸发器风量实时控制研究

本文开发了基于单片机的轿车空调全自动控制系统,提出了轿车空调蒸发器风量实时控制的控制策略,为进一步研究轿车空调的舒适性控制提供基础.