Answer :
Final answer:
If the airflow across an evaporator is decreased, the evaporator temperatures will increase due to less heat being removed from the refrigerant, and the suction pressure will decrease as less pressure is applied to maintain the refrigerant at a constant temperature.
Explanation:
In the context of refrigeration systems, the airflow across the evaporator coil can significantly influence both the evaporator temperature and the suction pressure. When the airflow across an evaporator is decreased, it means less heat is removed from the refrigerant. This results in higher evaporator temperatures as it is not cooled as much as it would be with a higher airflow. Concurrently, the suction pressure decreases because it is directly related to the temperature of the refrigerant; as the refrigerant is warmer, less pressure is applied to keep it at a constant temperature, resulting in lower suction pressure. So, the correct answer here is A. Evaporator temperatures increase, suction pressure decreases.
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