Question 479General Subjects - Assistant Engineer70% to pass
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
AI Explanation
The correct answer is B) 27%.
The reasoning is as follows:
1. The air starts at a dry bulb temperature of 60°F and a relative humidity of 52%.
2. As the air passes over the heating coil, it undergoes a sensible heat gain, resulting in the off-coil temperature of 80°F.
3. Using the psychrometric chart, the relative humidity at 80°F with the same moisture content (constant humidity ratio) as the initial condition of 60°F and 52% relative humidity is 27%.
The other options are incorrect because:
A) 19% is too low, C) 55% is too high, and D) 70% is also too high for the given conditions.
Related Questions
#477 Referring to the illustrated psychrometric chart, if the dry bulb temperature is 70oF and the relative humidity is 50%, what is the absolute humidity? Illustration GS-RA-22 #478 Referring to the illustrated psychrometric chart, if the measured dry bulb temperature is 80oF and the measured wet bulb temperature is 70oF, what is the determined relative humidity? Illustration GS-RA-22 #481 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 #482 Referring to the illustrated psychrometric chart, suppose during the cooling season that air passes over a cooling coil with a mean surface temperature below the dew point temperature, and this results in sensible heat loss and dehumidification. What statement represents the direction of the air conditioning process line? Illustration GS-RA-22 #483 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