text: The choice of a heat transfer fluid is critical for system efficiency and longevity. Here are some commonly used fluids:
  * Water: The most widely used due to its high heat capacity and thermal conductivity.
  * Mono-ethylene glycol: Often used in a mixture with water to lower the freezing point for use in colder climates.
  * Propylene glycol: Preferred in food production and other industries where toxicity might be a concern.
  * Silicone oil: Used for its stability at high temperatures and electrical insulating properties.
  * Synthetic and aromatic heat transfer fluids: Employed in high-temperature applications, such as solar power generation and industrial heat processes.
  * Molten salts: Utilized in solar energy systems for their capacity for thermal storage and ability to operate at very high temperatures.