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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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轿车空调车室内温度场分布特性的经验公式 总被引:1,自引:0,他引:1
针对轿车空调车室内的温度场分布特性,在理论分析并结合实验测量和数值模拟的基础上,提出简捷而较可靠的动态经验公式。该经验公式考虑环境温度,太阳辐射,空调送风参数和人体等诸多影响因素后,可以计算在任意时刻下的轿车空调车室内的任意空间点处的温度值。 相似文献
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Known as one of the most promising application of metal hydride(MH),the MH compressor can afford hydrogen with high pressure and high purity.Two AB5 type multi-component hydrogen storage alloys and vanadium are studied for the purpose of high pressure compression.A compact compression system has been built.Each designed small-size reactor contains seven special stainless-steel pipes.The single stage compressor can improve the hydrogen pressure from 2 up to 35 MPa with the hydrogen desorbed per unit mass of 207.8 mL/g.The two-stage compression can output hydrogen with pressure of 38 MPa steadily in whole 5.7 mol hydrogen output flow.However,its hydrogen desorbed per unit mass was only computed to 106.9 mL/g as a result of two reactors used in the cycle and the output mass of hydrogen increased less. 相似文献
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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
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Effect of Header Configuration on Refrigerant Distribution in Parallel Flow Microchannel Evaporators
The refrigerant flow distribution in the parallel flow microchannel evaporators is experimentally investigated to study the effect of header configuration.Six different configurations are tested in the same evaporator by installing insertion device and partition plate in the header to ensure the consistency of the other structure parameters.The results show that the uniformity of refrigerant flow distribution and the heat transfer rate are greatly improved by reducing the sectional area of header.The heat transfer rate can increase by 67.93% by reducing the sectional area of both inlet and outlet headers.The uniformity of refrigerant flow distribution and the heat transfer rate become worse after installing the partition plate in the insertion devices and changing the inner structure of the header further. 相似文献
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