Abstract In this study, utilization of R466A with low-GWP is investigated in variable refrigerant flow (VRF) systems. R410A is widely used in VRF systems. Only non-flammable refrigerants are allowed for these systems since they require high amount of refrigerant charge. However, most of refrigerants, which have low-GWP and may be suitable for air-conditioning systems, are flammable. The analysis was carried out for both cases of cooling mode and heating mode. Three evaporation temperatures (4, 8 and 12 °C) and three condenser temperatures (40, 50, 60 °C) were considered for cooling mode in the study. In heating mode, three different evaporation temperature values (−10, −5 and 0 °C) while single condenser temperature of 45 °C were used for the investigation. The results pointed out that both cooling capacity and heating capacity amounts of R466A were greater in comparison with R410A. COP values of R466A were determined as higher than R410A about by 5–15% and 4% in cooling mode and heating mode, respectively. Thus, R466A can be utilized as a suitable refrigerant for VRF systems and air-conditioners as an alternative to R410A. In the short term, R466A can be directly used without performing any constructional modification in the system operating with R410A.

中文翻译：

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在 VRF 系统中作为 R410A 替代品的 R466A 的高能性能分析

摘要 在这项研究中，研究了在可变制冷剂流量 (VRF) 系统中使用具有低 GWP 的 R466A。R410A 广泛用于 VRF 系统。这些系统只允许使用不可燃的制冷剂，因为它们需要大量的制冷剂充注量。然而，大多数具有低 GWP 且可能适用于空调系统的制冷剂都是易燃的。对冷却模式和加热模式两种情况进行了分析。研究中考虑了三种蒸发温度（4、8 和 12 °C）和三个冷凝器温度（40、50、60 °C）作为冷却模式。在加热模式下，三个不同的蒸发温度值（-10、-5 和 0 °C），而单个冷凝器温度为 45 °C 用于研究。结果表明，与R410A相比，R466A的制冷量和制热量都更大。在冷却模式和加热模式下，R466A 的 COP 值被确定为比 R410A 高约 5-15% 和 4%。因此，R466A 可用作 VRF 系统和空调的合适制冷剂，作为 R410A 的替代品。在短期内，R466A 可以直接使用，无需在使用 R410A 的系统中进行任何结构修改。