Question 149Refrigeration & AC - 1st Asst/Chief

The correct answer is C) 40 grains. To determine the quantity of moisture removed from one pound of the conditioned air, we need to use the psychrometric chart. The psychrometric chart shows the relationship between temperature, relative humidity, and the amount of moisture in the air. Given: - The introduction of outside air is 90°F with a relative humidity of 60%. - The air has been conditioned to 70°F with a relative humidity of 80%. By locating the two points on the psychrometric chart and drawing a line between them, we can determine the difference in moisture content, which is 40 grains per pound of air. The other options are incorrect because they do not match the value obtained from the psychrometric chart analysis.