NCEES Practice Exam morning HVAC problem

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I M A PE

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Here's the problem in quesiton, straight from the NCEES practice exam of 2011:

A room contains equipment that consumes 3,000 W of power. In addition, 5 lb/min of water vapor is released into the room. The resulting cooling load (Btu/hr) is most nearly:

A) 3,000

B) 4,500

C) 10,000

D) 15,000

The solution requires the use of the heat of vaporization of water and the book used 970 Btu/lbm which comes off of the steam tables by pressure at std. atm. I would have used the value off of the table by temp for room temp, which is a different value. How do you know which table to use for a problem like this?

 
Was the room's temperature provided? If not, it's safer to use the pressure table.

 
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