R290用焓差实验室制冷剂泄漏模拟分析
Laboratory Refrigerant Leak Simulation Analysis with Enthalpy Difference for R290

R290是一种很有前途的空调替代制冷剂，为了促进R290在空调中的安全应用，本文以某单位建好的R290用焓差实验室为研究对象，建立了在有限空间内存在室内自循环的制冷剂泄漏和扩散的数学模型，对以使用R290为制冷剂的被测制冷设备(热泵)在发生泄漏的情况下，用CFD对泄漏后的试验房间进行模拟计算，分析探讨R290泄露到有限外部空间的爆炸风险。本文假设泄漏孔为圆形泄漏孔，泄漏孔直径为4 mm，泄漏量1.3 kg，泄漏时间为240 s，整个过程匀速泄漏，发现在整个过程中，除开在泄漏时间(240 s)内的泄漏口附近之外，整个泄漏过程都不存在R290燃爆的浓度区间。
R290 is a promising alternative refrigerant for air conditioning. In order to promote the safe appli-cation of R290 in air conditioning, this paper takes the R290 enthalpy difference laboratory built by a certain unit as the research object, and establishes a mathematical model for the leakage and dif-fusion of indoor self-circulating refrigerant in a limited space. In the case of leakage of the tested re-frigeration equipment (heat pump) using R290 as refrigerant, CFD is used to simulate the test room after leakage, and the explosion risk of R290 leaking into the limited outer space is analyzed and discussed. In this paper, it is assumed that the leakage hole is a circular leak hole, the diameter of the leak hole is 4 mm, the leakage amount is 1.3 kg, and the leakage time is 240 s, and the leakage rate is uniform throughout the whole process. It is found that there is no concentration range of R290 explosion in the whole process except near the leakage port within the leakage time (240 s).