To avoid start-up difficulties in cold weather, a thermal fluid must have what property?

A thermal fluid needs to have a low pour point to ensure it remains fluid and can flow easily in cold weather conditions. If a thermal fluid has a high pour point, it can become thick or even solidify, preventing it from circulating effectively through the system. This can lead to start-up difficulties such as pump failure or inadequate heating, as the fluid won't move where it needs to go to facilitate the necessary processes.

Choosing a thermal fluid with a low pour point allows for reliable operation in low temperatures, ensuring that the system can start up effectively without the risk of blockages or damage due to inadequate fluidity.