(573q) “a Review of Existing Data and ASTM E681 Testing for Flammability Limits of Hydrofluorocarbons and Their Mixtures: Towards a Predictive Model”

Flammability limits of gases and their mixtures are critical parameters for ensuring the safety and efficiency of various industrial processes, particularly in refrigeration systems. The ASTM E681 standard provides a reliable methodology for discerning these limits experimentally, yet there is a pressing demand for predictive models capable of quickly and accurately estimating flammability limits. With the advent of next generation refrigerants, characterized by their lower global warming potential (GWP), a thorough understanding of the flammability characteristics of both current and low-GWP refrigerants is essential for the transition to novel refrigeration systems.

This research focuses on collecting reliable experimental data regarding the flammability limits of refrigerants currently in circulation: pure hydrofluorocarbons (HFCs) and their mixtures. Through meticulous literature review, we investigate the consistency and reliability of existing flammability data. Moreover, we adopt ASTM E681 testing guidelines in the design of an experimental apparatus, considering the effect of temperature, pressure, humidity, and composition on the flammability limits of HFC mixtures.

In this study, we aim to develop a model for predicting the flammability limits of pure refrigerant gases and their mixtures under varying conditions of temperature, pressure and composition. Our approach involves a comprehensive literature review, data collection of experimental flammability limits, and a rigorous statistical analysis to identify correlations between flammability limits and thermodynamic properties.

Through this multi-faceted approach, we seek to establish a comprehensive understanding of the flammability limits of refrigerant gases and mixtures. Ultimately, the goal is to provide engineers and safety professionals with an efficient tool for assessing flammability hazards, thereby facilitating the design and operation of safe and sustainable refrigeration systems.