Question 221General Subjects - 1st Asst/Chief70% to pass
Referring to the illustrated psychrometric chart, suppose during the cooling season that air passes over a cooling coil with a mean surface temperature above the dew point temperature, and this results in sensible heat loss with no change in moisture content. What statement represents the direction of the air conditioning process line? Illustration GS-RA-22
AI Explanation
The correct answer is B) The air conditioning process line is horizontal with the coil outlet to the left of the coil inlet.
This is because when air passes over a cooling coil with a mean surface temperature above the dew point temperature, the air experiences sensible heat loss without a change in moisture content. On the psychrometric chart, this results in a horizontal process line moving to the left, as the dry-bulb temperature decreases while the humidity ratio remains constant.
The other options are incorrect because they do not accurately represent the direction of the air conditioning process line under the given conditions. A vertical process line (options C and D) would indicate a change in moisture content, which is not the case here.
Related Questions
#219 In the illustrated single zone HVAC system, what prevents the simultaneous flow of steam through the preheat coil and flow of chilled water through the cooling coil? Illustration GS-RA-09 #220 Referring to the illustrated psychrometric chart, under what conditions are the dry bulb, wet bulb, and dew point temperatures for air all equal in value? Illustration GS-RA-22 #222 Referring to the illustrated psychrometric chart, if the dry bulb temperature is 70oF and the relative humidity is 40%, what is the absolute humidity? Illustration GS-RA-22 #223 What temperature associated with the psychrometric properties of air is measured by an ordinary thermometer? #224 Referring to the illustrated psychrometric chart, suppose air at a dry-bulb temperature of 60oF and a relative humidity of 52% passes over a heating coil, resulting in sensible heat gain, and the off-coil temperature is now 80oF. What is off-coil relative humidity? Illustration GS-RA-22