Which refrigerant is typically used in absorption refrigeration systems?

Absorption refrigeration systems commonly utilize R-717, also known as ammonia. This refrigerant is effective due to its excellent thermodynamic properties, including high latent heat of vaporization and good energy efficiency. Ammonia is especially suitable for absorption systems because it can dissolve in water, creating a strong absorbent solution that allows for effective heat transfer and refrigeration cycles.

In addition to its efficiency, ammonia has a low environmental impact compared to some synthetic refrigerants, contributing to its use in large-scale industrial applications and commercial refrigeration systems. Its availability and historical usage further support its preference in these types of systems.

Other refrigerants listed, such as R-134a and R-12, are primarily used in vapor-compression refrigeration cycles, not absorption systems. HFOs, while being newer refrigerants focused on reducing greenhouse gas potential, are also not typical for absorption refrigeration applications.