Question 148Refrigeration & AC - 1st Asst/Chief

The correct answer is C) A regulating valve controls the quantity of chilled water flowing in the cooling coils. This is the correct answer because the circulated air temperature in an air conditioning system using chilled water circulation is primarily controlled by regulating the flow of chilled water through the cooling coils. By adjusting the opening of a regulating valve, the amount of chilled water flowing across the coils can be increased or decreased, which in turn affects the temperature of the air being cooled as it passes over the coils. The other options are incorrect because they do not directly control the temperature of the circulated air. Changing the inlet temperature of the water (A) or the fan speed (B) can affect the cooling capacity, but do not directly regulate the air temperature. Varying the number of air passes across the coils (D) also does not directly control the air temperature.