采用R1234yf的平板管百叶式汽车冷凝器的性能

IF 0.8 Q4 THERMODYNAMICS
H. M. Gurudatt, G. Narasimham, B. S. Gowda
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引用次数: 0

摘要

对一种小型通道、平板管、百叶翅片的汽车冷凝器进行了数值模拟,研究了换热器的散热率、压降和性能。对制冷剂R1234yf进行了仿真研究。R1234y的性能是通过REFPROP软件获得的。湿空气的性质是由干空气和水蒸气的性质利用适当的相关性计算出来的。为了选择输入数据,在低压侧[公式:见文]C和高压侧[公式:见文]C的温度极限范围内,对使用R1234yf的标准蒸汽压缩制冷系统进行循环性能试验。冷凝过程分为过热区、两相区和过冷区三个部分。在MATLAB中编写了自定义代码,求解制冷剂到管内壁、管内壁到外壁、外壁到湿空气的传热联立方程。模拟结果表明,与冷凝区相比,减速加热区的显热传递很小。结果报告沿冷媒流动通道的压力变化在过热,两相和过冷区域。在高干燥分数的两相区,传热系数最高。与进口空气温度相比,进口空气速度对排热率的影响较小。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Performance of a Flat-Tube Louvered-Fin Automotive Condenser with R1234yf
Numerical simulation of a mini-channel, flat-tube, louvered fin, automotive condenser is performed to study the heat rejection rate, pressure drop and performance of the heat exchanger. The simulation study is carried out for the refrigerant R1234yf. The properties of R1234y are obtained from REFPROP software. The moist air properties are calculated from those of dry air and water vapor using suitable correlations. To select the input data, the cycle performance is carried out for a standard vapor compression refrigeration system working with R1234yf between the temperature limits of [Formula: see text]C on the low-pressure side and [Formula: see text]C on the high-pressure side. The condensation process is taken into account in three sections, namely, the superheated, two-phase and the subcooled regions. A custom code is prepared in MATLAB to solve the simultaneous equations of heat transfer from refrigerant to inside tube wall, inside tube wall to outside tube wall and outside tube wall to moist air. The simulation results show the sensible heat transfer during desuper heating to be very small compared to the condensing region. Results are reported for the pressure variation along the refrigerant flow passage in the desuper heating, two-phase and subcooling regions. The heat-transfer coefficient is found to be the highest in the two-phase region for higher dryness fractions. The effect of inlet air velocity is less compared to that of the inlet air temperature on the heat rejection rate.
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来源期刊
CiteScore
2.70
自引率
10.00%
发文量
0
期刊介绍: As the only international journal in the field of air-conditioning and refrigeration in Asia, IJACR reports researches on the equipments for controlling indoor environment and cooling/refrigeration. It includes broad range of applications and underlying theories including fluid dynamics, thermodynamics, heat transfer, and nano/bio-related technologies. In addition, it covers future energy technologies, such as fuel cell, wind turbine, solar cell/heat, geothermal energy and etc.
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