Question 149Refrigeration/AC - 1st Asst/Chief70% to pass
The introduction of outside air to the air conditioning system is 90°F with a relative humidity of 60%. The air has been conditioned to 70°F with a relative humidity of 80%. Using the psychrometric chart, shown in the illustration, determine the quantity of moisture removed from one pound of the conditioned air. Illustration GS-RA-22
AI Explanation
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.
Related Questions
#147 Concerning the arrangement of equipment and associated hoses shown in the illustration, which statement is true? Illustration GS-RA-59 #148 Which of the following methods is normally used to control the circulated air temperature of an air conditioning system using chilled water circulation? #150 In an air conditioning system, moisture is removed from the air by what means? #151 Concerning the operation of refrigeration systems, frosting or sweating of a liquid line is usually indicative of what condition? #152 If the needle and seat assembly is excessively eroded, the valve cage assembly can be replaced. In replacing the original valve cage assembly rated at 1/2 tons, what would be the result if the replacement valve cage was oversized at 5 tons? Illustration GS-RA-07