Outside air at 90 degrees Fahrenheit and 80% relative humidity is delivered to a
ID: 731658 • Letter: O
Question
Outside air at 90 degrees Fahrenheit and 80% relative humidity is delivered to a building at 70 degrees Fahrenheit and 50 % relative humidity. (P= 1 atm both locations)a) Calculate amount of heat removed per unit of dry air in any cooling step.
b)Calculate amount of heat added per unit of dry air in any heating step.
c) For air flow of 10,000 scfm, calculate power assuming heat addition is 100% efficient and heat removal required work. Cooling water is available at 55 degrees Fahrenheit and can be used to cool air to within 10 degrees of the cooling water temperature. Further cooling required refrigeration where work consumption is 1.5 times the energy removed in cooling.
Explanation / Answer
a)21.62% well..wet bulb temp=70F dry bulb temp=100F look in the psychrometric chart(which z drawn using Farenheit scale..if u cudnt find..try converting these temps into Celsius) where Vertical line(dry bulb) of 100F and diagonal line of 70F intersect..and check the relative humidity at that point..it will be about 22% i guess..I used a online psychometric calculator..so got an answer that precise.. b) I guess they asked for maximum possible temp..cuz swamp cooler already increases relative humidity to 90%..so there is no need to find it again.. and temp will be(wet bulb)..97F..again frm psychometric chart. Hope that helps :)
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