1.- Name four air characteristics that define comfort.
  

2.- What is a comfort chart?
  

3.- What means 70% Relative humidity?
  

4.- What is the Dew-point Temperature?
  

5.- What information is it possible to obtain with the phycrometric chart.
 

 6.- If the total air circulation in a room is 6,000 cfm at 75º F DB and 50% RH and 1000 cfm of outside air is 91º F DB and 60 % RH, find the mixture RH, DB and WB temperatures. 

7.- If the specific volume of air is 14.2 cu ft/lb. at 77º F WB, the relative humidity will be ______________________.

8.- Given:  Indoor condition of 80º F and 50% RH.  Find:  WB and DP (dew point) temperatures.
 
  

9.- Given:  Condition of 60º F WB and 72º F db.  Find:  RH
  
 

10.- Given:  68.6º F DB and 60.4º F WB.  Find:  RH
 
  

11.- Given:  Outdoor design of 95º F DB and 78º F WB; indoor design of 80º F DB and 67º F WB; 20,000 cfm required air circulation; and 4,000 cfm required ventilation air. Find DB temperature of mixture.
 
  

12.- Given:  Outdoor design of 100º F DB and 77º F WB; indoor design of 85º F DB and 67º F WB; 6,000 cfm required air circulation, and 960 cfm required ventilation air.  Find WB temperature of mixture.
 
  

13.- What is the compressor function in an AC system?
 
 

14.- What does the drain line do in an AC?
 
 

15.-  What is the expansion valve for?