Free A2L A2L Flammability Characteristics and Metrics Questions and Answers

Question 1

What does the Lower Flammability Limit (LFL) of a refrigerant represent?

Accepted Answer

The minimum concentration in air required to support combustion.

Answer

The maximum temperature at which the refrigerant will ignite.

Answer

The amount of heat released when the refrigerant burns.

Answer

The speed at which the flame front travels.

Question 2

How does the Minimum Ignition Energy (MIE) of an A2L refrigerant compare to that of an A3 refrigerant like propane (R-290)?

Accepted Answer

The MIE of an A2L is significantly higher than an A3.

Answer

The MIE of an A2L is significantly lower than an A3.

Answer

The MIE of an A2L is approximately the same as an A3.

Answer

MIE is not a relevant metric for comparing A2L and A3 refrigerants.

Question 3

The '2L' in the ASHRAE 34 safety classification A2L signifies what?

Accepted Answer

Lower toxicity and a burning velocity of 10 cm/s or less.

Answer

Lower toxicity and a burning velocity greater than 10 cm/s.

Answer

Higher toxicity and a burning velocity of 10 cm/s or less.

Answer

Lower toxicity and non-flammable characteristics.

Question 4

What is the Heat of Combustion (HOC)?

Accepted Answer

The amount of heat energy released when a refrigerant burns.

Answer

The temperature required for a refrigerant to self-ignite.

Answer

The pressure generated by the rapid expansion of burning gas.

Answer

The minimum energy spark needed to cause ignition.

Question 5

An A2L refrigerant is considered flammable only when its concentration in air is...

Accepted Answer

Between the LFL and the UFL.

Answer

Above the Upper Flammability Limit (UFL).

Answer

Below the Lower Flammability Limit (LFL).

Answer

At exactly 50% concentration.

Question 6

Compared to A1 refrigerants, A2L refrigerants have:

Accepted Answer

Similar toxicity but a higher degree of flammability.

Answer

Higher toxicity and lower flammability.

Answer

The same flammability characteristics.

Answer

Lower toxicity and are non-flammable.