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首页> 外文期刊>Science and Technology for the Built Environment >Experimental analysis and modeling of lubricant effects in microchannel evaporators working with low global warming potential refrigerants
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Experimental analysis and modeling of lubricant effects in microchannel evaporators working with low global warming potential refrigerants

机译：在具有低全球变暖潜能的制冷剂下工作的微通道蒸发器中润滑剂效应的实验分析和建模

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摘要

In any vapor compression system, lubricant is needed to guarantee safe and reliable compressor operation. Indeed, most compressor mechanical failures are generally due to improper oil management, such as, lack of proper lubrication inside the compressor. Since in the usual operating condition of the system a small portion of oil circulates with the refrigerant through the system components, it can be retained inside the heat exchangers leading to oil missing from the compressor. In present article, the lubricant retention characteristics of two microchannel type evaporators for residential air conditioning systems and the oil detrimental effects on evaporator capacity and refrigerant-side pressure drop were investigated. The working fluids used in this study were R410A, as reference refrigerant, and low global warming potential refrigerants R32, R1234yf, and R454B, a new low global warming potential mixture candidate to replace R410A, whereas the lubricant was VG 32 Polyolester oil. The effects of oil mass fractions and degree of superheat were experimentally investigated considering working conditions typically found in air conditioning systems. Finally, the experimental results of the present article provided data that were used to develop and validate a semi-empirical model for microchannel evaporator simulation able to account for the oil presence. The developed model was summarized in the current article and the results were compared with the experimental ones in term of oil retention, capacity, and refrigerant-side pressure drop.
机译：在任何蒸气压缩系统中，都需要润滑剂以确保压缩机安全可靠地运行。实际上，大多数压缩机机械故障通常是由于机油管理不当造成的，例如，压缩机内部缺乏适当的润滑。由于在系统的正常运行状态下，一小部分机油会与制冷剂一起通过系统组件循环，因此它可以保留在热交换器内部，从而导致压缩机中的机油丢失。在本文中，研究了两个用于住宅空调系统的微通道式蒸发器的润滑剂保留特性，以及油对蒸发器容量和制冷剂侧压降的有害影响。本研究中使用的工作流体为R410A（作为参考制冷剂）和低全球变暖潜能的制冷剂R32，R1234yf和R454B（一种新的全球变暖潜能值低的新候选替代品，代替R410A），而润滑剂为VG 32多元油。考虑到空调系统中通常存在的工作条件，通过实验研究了油质量分数和过热度的影响。最后，本文的实验结果提供了用于开发和验证微通道蒸发器模拟的半经验模型的数据，该模型能够解释油的存在。本文总结了所开发的模型，并在保油量，容量和制冷剂侧压降方面与实验结果进行了比较。

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