What is the Heat of Combustion (HOC) range for R-290?

• A. 10,000-10,500 Btu/lb
• B. 15,000-15,500 Btu/lb
• C. 19,000-19,200 Btu/lb
• D. 25,000-26,000 Btu/lb

Answer: (C)

The Heat of Combustion (HOC) for R-290, which is propane, typically falls within the range of 19,000 to 19,200 Btu/lb. This value is significant because it indicates the amount of energy that can be released when a certain amount of propane is completely combusted. Understanding the HOC is crucial for safety and handling practices, especially with refrigerants that can potentially ignite. Knowing the HOC helps technicians assess the risks involved with using flammable refrigerants like R-290 and implement appropriate safety measures.

The other ranges provided do not accurately represent the HOC for R-290, thereby leading to a misunderstanding of its energy characteristics and safety considerations. Proper training and knowledge about these values are essential for professionals working with low global warming potential refrigerants to ensure safe and effective practices.