Why is ammonia (R-717) considered zero GWP and what major service challenge does it present?

Why is ammonia (R-717) considered zero GWP and what major service challenge does it present?

• A. It has essentially no GWP; it is highly toxic and presents hazard in occupied spaces.
• B. It has zero GWP but is non-toxic; safe for occupied spaces.
• C. It has low GWP and is easy to handle in any environment.
• D. It has no effect on GWP; it is non-toxic.

Answer: (A)

GWP measures how much heat a greenhouse gas traps in the atmosphere relative to CO2. Ammonia contains no carbon and does not absorb infrared radiation in the same way as carbon-containing gases, so its direct warming effect is essentially zero. That’s why ammonia is considered zero GWP. The major service challenge is its toxicity. Ammonia is highly toxic to humans; inhalation can cause severe irritation, lung injury, or worse, especially in poorly ventilated areas. Because of this, leaks pose serious hazard in occupied spaces, requiring rigorous safety measures, detection, proper ventilation, and procedures that keep maintenance work out of occupied areas. So while its GWP is zero, the safety risk to people is the defining service challenge.

GWP measures how much heat a greenhouse gas traps in the atmosphere relative to CO2. Ammonia contains no carbon and does not absorb infrared radiation in the same way as carbon-containing gases, so its direct warming effect is essentially zero. That’s why ammonia is considered zero GWP.

The major service challenge is its toxicity. Ammonia is highly toxic to humans; inhalation can cause severe irritation, lung injury, or worse, especially in poorly ventilated areas. Because of this, leaks pose serious hazard in occupied spaces, requiring rigorous safety measures, detection, proper ventilation, and procedures that keep maintenance work out of occupied areas. So while its GWP is zero, the safety risk to people is the defining service challenge.