3. Results and discussion
3.1 Fireextinguishing
concentration
On account of the boiling point of R123 (27.9 °C) exceed normal
temperature, the fire-extinguishing experiment was performed under the
heating condition. Herein, the calculation of minimum extinguishing
concentration (MEC) should consider the temperature and pressure
compensation. The temperature mainly influenced the gas flowed, so
except for the flowmeter’s conversion coefficient, the calculation
required temperature and pressure compensation to calculate the actual
flow. Based on the above consideration, the average MEC of R123 on
methane fire was calculated as 7.31 %, the result is similar to
reported results. By using the same cup burner test, the extinguishing
concentration of R125 on methane fire under the normal temperature and
pressure was 8.91 % by standard method calculated. Compared with the
results of R125, R123 has a lower MEC, which indicates the better
efficiency of fire suppression of R123.