Which transfer fluid is ideal for high temperature, low pressure applications?

The ideal transfer fluid for high temperature, low pressure applications is hot oil. Hot oil systems are designed to operate efficiently at elevated temperatures without the risk of boiling or vaporization that can occur with water.

One of the main advantages of using hot oil is its high thermal stability, which allows it to maintain its properties and efficiency even at high temperatures. Unlike water, which has a boiling point of 100°C (212°F), hot oil can withstand much higher temperatures without turning into vapor, making it more suitable for processes that require consistent heat transfer at non-pressurized conditions.

Additionally, hot oil systems can provide better thermal conductivity at these elevated temperatures compared to other fluids, which improves overall energy transfer efficiency. This makes hot oil particularly useful in applications such as chemical processing, food production, and other industries where maintaining a high temperature is critical for process efficiency.

Other options are less appropriate due to their limitations in high temperature scenarios or specific use cases. For instance, water becomes vapor at high temperatures and could lead to pressure build-up, glycol can degrade at elevated temperatures, and liquid ammonia poses risks in terms of handling and is not suitable for general high temperature applications.