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首页> 外文会议>Proceedings of the 43rd annual loss prevention symposium >FLAMMABILITY CHARACTERISTICS OF LOW GWP REFRIGERANT HFO-1234yf
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FLAMMABILITY CHARACTERISTICS OF LOW GWP REFRIGERANT HFO-1234yf

机译：低全球升温潜能值制冷剂HFO-1234yf的易燃性

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摘要

HFO-1234yf is a new low global wanning refrigerant developed to replace HFC-134a in automotive air conditioning systems. HFC-134a is being phased out in the European Union due to high global warming potential. HFO-1234yf is highly energy efficient, exhibits low toxicity, and can potentially be used in systems currently designed for refrigerant HFC-134a with minimal modifications. Significant work as been completed to assess the flammability characteristics of HFO-1234yf. Though it is flammable per ASTM E-681, it is significantly less so than HFC-152a which has also been considered as an HFC-134a alternative. HFO-1234yf has a relatively high lower flammability limit at 6.2 vol% in air. Computational Fluid Dynamics (CFD) modeling has shown it is very unlikely the lower flammability limit will be reached when refrigerant is leaked into the passenger compartment of a vehicle. HFO-1234yf also has a high minimum ignition energy (MIE) from 5,000-10,000 mJ which indicates there may be very few potential ignition sources in a vehicle. It also has very low burning velocity at 1.5 cm/sec indicating low potential for damage should an ignition occur. Several automotive industry groups have completed extensive risk assessments which have concluded HFO-1234yf is safe to use as a refrigerant in vehicles. This paper will review flammability test results and challenges overcome to measure flammability of a mildly flammable refrigerant as well as CFD modeling work for vehicle leakage scenarios.
机译：HFO-1234yf是一种新型的全球低排放制冷剂，旨在替代汽车空调系统中的HFC-134a。由于高的全球变暖潜力，HFC-134a正在欧盟淘汰。 HFO-1234yf具有很高的能效，毒性低，并且可以潜在地用在目前为制冷剂HFC-134a设计的系统中，只需进行最小的改动即可。已完成大量工作来评估HFO-1234yf的可燃性。尽管根据ASTM E-681可燃，但它远小于HFC-152a，后者也被认为是HFC-134a的替代品。 HFO-1234yf在空气中的燃烧极限较低，为6.2 vol％。计算流体动力学（CFD）模型表明，当制冷剂泄漏到车辆的乘客车厢内时，不太可能达到较低的可燃极限。 HFO-1234yf还具有从5,000-10,000 mJ的较高的最小点火能量（MIE），这表明车辆中潜在的点火源很少。它还具有1.5 cm / sec的极低燃烧速度，表明如果着火，则损坏的可能性很小。几个汽车工业集团已经完成了广泛的风险评估，得出的结论是HFO-1234yf可安全用作车辆中的制冷剂。本文将回顾可燃性测试结果和克服的挑战，以测量轻度可燃制冷剂的可燃性，以及针对车辆泄漏场景的CFD建模工作。

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