What is the lowest recommended temperature for using a calcium chloride brine?

The correct choice regarding the lowest recommended temperature for using calcium chloride brine is based on the brine's ability to remain effective as a secondary refrigerant. Calcium chloride has a lower freezing point compared to other common brine solutions, which allows it to be utilized in colder environments.

Specifically, calcium chloride brine can provide efficient heat transfer and stay liquid at lower temperatures, making it suitable for refrigeration applications in colder climates or facilities. The recommended temperature of -41.8 degrees Fahrenheit indicates that this solution remains fluid and performs optimally under those conditions, avoiding issues related to freezing that can occur with less effective brine solutions.

This characteristic is essential for systems that require consistent operation in very low-temperature settings, such as certain industrial refrigeration systems. Other options either represent temperatures at which the calcium chloride brine would begin to freeze, thus decreasing its effectiveness, or do not meet the operational needs for colder applications. Understanding these attributes allows for better decision-making when selecting brine solutions for refrigeration purposes.