Energy and Exergy Analysis of R600a as a Substitute for R134a in Automotive Air Conditioning System

Q3 Chemical Engineering

Journal of Advanced Research in Fluid Mechanics and Thermal Sciences Pub Date : 2024-07-16 DOI:10.37934/arfmts.119.1.105116

Muhammad Arman, Kasni Sumeru, Andriyanto Setyawan, Luga Martin Simbolon, Mohamad Firdaus Sukri

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Abstract

Until now, R134a is still used as a working fluid in automotive air conditioning (A/C) even though it has a very high global warming potential (GWP), which is 1430. Refrigerant R600a is an alternative working fluid as a substitute for R134a in automotive (A/C). This environmentally friendly substitute refrigerant is also expected to produce a better system performance, for which it is necessary to analyse energy and exergy. During work, each AC component generates friction, heat loss, and pressure drop which causes irreversibility in each component. The irreversible quantity of each component is calculated by exergy analysis. Because automotive A/C is driven by engine rotation, its performance is also affected by engine rotation. In this study, the engine rotation to be evaluated is 1000, 1500, 2000, 2500, and 3000 rpm. The evaporating and condensing temperatures of automotive A/C in this study were 5oC and 45oC, respectively. Based on the energy analysis it was found that replacing R134a with R600 enhanced COP, for example at 2000 rpm for R134a and R600a respectively were 3.59 and 3.69, or an increase in COP of about 3%. Based on the exergy analysis, the greatest irreversibility occurred in the compressor, namely 72.1% and 78.6% for R134a and R600a, respectively, for 2000 rpm. This means that there is a potential to enhance the COP improvement using R600a by reducing the irreversibility on the compressor.

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汽车空调系统中 R600a 作为 R134a 替代品的能量和能效分析

到目前为止，R134a 仍被用作汽车空调（A/C）的工作液，尽管它的全球变暖潜能值（GWP）非常高，达到 1430。制冷剂 R600a 是汽车空调（A/C）中 R134a 的替代工作液。这种环境友好型替代制冷剂有望产生更好的系统性能，因此有必要对能量和放能进行分析。在工作过程中，每个空调组件都会产生摩擦、热损耗和压降，从而导致每个组件的不可逆。每个组件的不可逆量可通过放能分析计算出来。由于汽车空调由发动机旋转驱动，因此其性能也会受到发动机旋转的影响。在本研究中，需要评估的发动机转速分别为 1000、1500、2000、2500 和 3000 rpm。本研究中汽车空调的蒸发和冷凝温度分别为 5 摄氏度和 45 摄氏度。根据能量分析发现，用 R600 取代 R134a 可提高 COP，例如在 2000 rpm 转速下，R134a 和 R600a 的 COP 分别为 3.59 和 3.69，即 COP 提高约 3%。根据放能分析，压缩机的不可逆性最大，在转速为 2000 rpm 时，R134a 和 R600a 的不可逆性分别为 72.1%和 78.6%。这意味着，通过降低压缩机的不可逆性，使用 R600a 有可能提高 COP。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Advanced Research in Fluid Mechanics and Thermal Sciences Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

2.40

自引率

0.00%

发文量

176

期刊介绍： This journal welcomes high-quality original contributions on experimental, computational, and physical aspects of fluid mechanics and thermal sciences relevant to engineering or the environment, multiphase and microscale flows, microscale electronic and mechanical systems; medical and biological systems; and thermal and flow control in both the internal and external environment.