HC-290 is one of the alternatives to HCFC22 in room air-conditioners. With the phase-down schedules in Kigali Amendment, it is imperative to use HC-290. However, there are concerns about its flammability in the event of a leak from the AC indoor unit (IDU). IEC 60335-2-40 has been revised to extend the capacity ranges for A2L refrigerants and is being further revised with a focus on A2 and A3 refrigerants. In real-life situations, furniture and occupants are present inside the room and these may positively or negatively influence the dispersion of any leaked HC-290. CFD simulation of dispersion of leaked HC-290 has been carried out for a variety of scenarios. The variables include leakage rates, IDU installation heights, IDU blower ON or OFF and types of furniture. Furniture, in general, appears to promote mixing, thereby reducing HC-290 stratification. The maximum concentration occurs on the side where the leak is directed by the momentum of the jet from IDU. There is no significant effect on the concentration distribution by the type and size of furniture with legs, although solid furniture has some marginal effect due to reduction of room free volume. The average concentration of HC-290 in the room is slightly more when the solid furniture like cupboards are placed some distance away from the IDU. The highest concentration at 30 cm above floor level, is 44% of LFL when the blower is ON, while it is 62% when the blower is OFF.

HC-290 是室内空调中 HCFC22 的替代品之一。根据基加利修正案中的逐步减少时间表，必须使用 HC-290。但是，如果空调室内机 (IDU) 泄漏，人们担心其易燃性。IEC 60335-2-40 已经过修订以扩展 A2L 制冷剂的容量范围，并且正在进一步修订，重点是 A2 和 A3 制冷剂。在现实生活中，房间内有家具和居住者，这些可能会对任何泄漏的 HC-290 的扩散产生积极或消极的影响。已针对各种情况对泄漏的 HC-290 的扩散进行了 CFD 模拟。变量包括泄漏率、IDU 安装高度、IDU 鼓风机开启或关闭以及家具类型。家具，一般来说，似乎促进混合，从而减少 HC-290 分层。最大浓度发生在泄漏由 IDU 射流的动量引导的一侧。有腿家具的类型和尺寸对浓度分布没有显着影响，尽管由于房间自由体积的减少，实心家具有一些边际效应。当橱柜等实心家具与 IDU 保持一定距离时，房间内 HC-290 的平均浓度略高。在地面以上 30 cm 处的最高浓度，当鼓风机开启时为 LFL 的 44%，而当鼓风机关闭时为 62%。尽管由于房间自由体积的减少，实心家具有一些边际效应。当橱柜等实心家具与 IDU 保持一定距离时，房间内 HC-290 的平均浓度略高。在地面以上 30 cm 处的最高浓度，当鼓风机开启时为 LFL 的 44%，而当鼓风机关闭时为 62%。尽管由于房间自由体积的减少，实心家具有一些边际效应。当橱柜等实心家具与 IDU 保持一定距离时，房间内 HC-290 的平均浓度略高。在地面以上 30 cm 处的最高浓度，当鼓风机开启时为 LFL 的 44%，而当鼓风机关闭时为 62%。