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Numerical Simulation of a Single-compartment Household Refrigerator During Start-up Transient and Stationary Cyclic Operation with Different Refrigerant Charges
Arabian Journal for Science and Engineering ( IF 2.9 ) Pub Date : 2021-03-09 , DOI: 10.1007/s13369-021-05490-1
Matheus dos Santos Guzella , Luben Cabezas-Gómez , Luiz Gustavo Monteiro Guimarães

A numerical study of the start-up transient and cyclic stationary operation of a single-compartment household refrigerator and an analysis of performance quantities at different refrigerant charges are performed. The working fluid is HFC-134a. The numerical model was developed using the commercial software GT-SUITE®. The individual models available in the software were applied for each component of the refrigeration system (compressor, evaporator, condenser, capillary tube and refrigerated compartment). The numerical model considers a solution of mass, momentum and energy principles using a distributed formulation in space and implicit in time. The ambient temperature and refrigerant charge of the refrigeration system are input data. The inside air temperature, power consumption and discharge and suction pressure were compared against literature experimental data for the start-up at different ambient temperatures (32 °C and 43 °C) and cyclic operations at 32 °C. Results for different refrigerant charges are presented considering both ambient temperatures. The numerical results showed reasonable agreement in comparison with literature experimental data, even for the different refrigerant charges. The maximum error for the inside air temperature is 4 °C and 2.5 °C during pull-down tests at, at 32 °C and 43 °C, respectively. The model failed to represent the pressure and power consumption peak during start-up, due to the simplicity of the compressor model. However, the steady-state values obtained by the numerical model are in good agreement with the experimental data. The same can be stated for the discharge and suction pressures.



中文翻译:

不同制冷剂量的单室家用冰箱启动瞬态和平稳循环运行的数值模拟

对单室家用冰箱的启动瞬态和循环平稳运行进行了数值研究,并对不同制冷剂量下的性能进行了分析。工作流体是HFC-134a。数值模型是使用商业软件GT-SUITE®开发的。软件中可用的各个模型适用于制冷系统的每个组件(压缩机,蒸发器,冷凝器,毛细管和冷藏室)。数值模型考虑了使用质量分布,动量和能量原理的解决方案,该解决方案使用空间中的分布式公式表示并在时间上隐式表示。制冷系统的环境温度和制冷剂充量是输入数据。车内空气温度 针对不同环境温度(32°C和43°C)下的启动以及32°C下的循环运行,将功率消耗,排气压力和吸气压力与文献实验数据进行了比较。给出了两种环境温度下不同制冷剂量的结果。数值结果与文献实验数据相比,即使对于不同的制冷剂注量,也显示出合理的一致性。在下拉测试中分别在32°C和43°C下,内部空气温度的最大误差分别为4°C和2.5°C。由于压缩机模型的简单性,该模型无法表示启动过程中的压力和功耗峰值。然而,通过数值模型获得的稳态值与实验数据非常吻合。

更新日期:2021-03-09
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