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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。 相似文献
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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.
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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. 相似文献
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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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With COP and dynamic characteristics in refrigeration cycle as criteria,a new metal hydride couple--LaNi4.61Mn0.26Al0. 13/La0.6Y0.4Ni4.8Mn0.2 was selected by establishing calculation procedure and metal hydride selection model. The experimental results show that the refigeration cycle of the selected couple is good in the performance. The recovered waste heat and refrigeration power from exhaust gas of several kinds of automobile are calculated by waste-heat formula ,coefficient RQ and COP. Refrigeration cycle of the new couple can satisfy the air-conditioning requirement of truck and car and is not enough in passenger car,according to the respective cooling load. 相似文献