👉 A circuit fluid, also known as a working fluid or refrigerant, is a substance used in various types of thermal systems, such as refrigeration cycles, air conditioning, and heat exchangers. It circulates through closed loops, absorbing heat from one location and releasing it at another. The fluid undergoes phase changes—typically between liquid and vapor—enabling efficient heat transfer. In a refrigeration cycle, for instance, the fluid evaporates at low pressure in the evaporator, absorbing heat from the surroundings, and then condenses back into a liquid at higher pressure in the condenser, releasing that heat to the environment. This continuous cycle of absorption and release allows the circuit fluid to effectively manage temperature differences, making it crucial for maintaining desired thermal conditions in various applications.
