Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7175266 | International Journal of Refrigeration | 2018 | 14 Pages |
Abstract
For evaluation of explosion scenarios in closed systems involving the mildly flammable refrigerants R1234yf, R1234ze and R32 dependent on the ignition energy, ignitions were carried out in a closed autoclave. A newly developed ignition system was used, which allows generating electric arcs with defined energies in a range between 3â¯J and 1000â¯J. The lower explosion limit of R32 decreases with increasing ignition energy. R32-explosions can be more severe than explosions involving highly flammable substances. However, in case of R1234yf and R1234ze, the ignition energy had to be increased to more than 100â¯J and more than 500â¯J to detect explosions in the closed system at all, although flame propagation phenomena can already be observed if these substances are ignited with much weaker ignition sources in open glass tubes. The explosions were very mild with these substances.
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Authors
E. Askar, V. Schröder, T. Schmid, M. Schwarze,