What occurs to refrigerant as it travels through the evaporator?

• A. It decreases in temperature
• B. It absorbs heat and rises in temperature
• C. It solidifies
• D. It remains unchanged

Answer: (B)

As refrigerant travels through the evaporator, it absorbs heat from the surrounding environment, which causes its temperature to increase. This process is essential for refrigeration because the evaporator is designed to facilitate the phase change of the refrigerant from a low-pressure liquid to a gas. As the refrigerant absorbs heat, it transitions into a gaseous state, which is crucial for the refrigeration cycle to work effectively. This absorption of heat allows the refrigerant to lower the temperature of the area it is serving, making the system functional in cooling applications. Therefore, the refrigerant rising in temperature while absorbing heat is a fundamental characteristic of how evaporators operate within refrigeration systems.