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?
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?