What type of refrigerant is commonly used in low-pressure systems?

In low-pressure systems, the refrigerants commonly employed are typically non-toxic and non-flammable. This characteristic is crucial because low-pressure systems often operate at temperatures where the safety and integrity of the refrigerant must be ensured. Non-toxic refrigerants pose less risk in the event of leakage, protecting both human health and the environment. Additionally, non-flammability is vital to prevent fire hazards, especially since low-pressure systems can sometimes be used in large applications where a substantial amount of refrigerant is present.

In contrast, while flammable refrigerants may have applications in specific systems, their use in low-pressure systems is limited due to safety concerns. Low toxicity refrigerants could be used but do not necessarily provide the same level of safety in terms of flammability. High-pressure refrigerants, by definition, are not applicable to low-pressure systems and would not function effectively under those conditions. The properties of non-toxic and non-flammable refrigerants make them the ideal choice for ensuring both safety and efficiency in low-pressure refrigeration systems.