1.- The heat in a substance that can be felt or “sensed” by touch is called ________________ heat.

2.- The amount of heat necessary to change the physical state of a substance is called _______________ heat.

3.- At atmospheric pressure the quantity of heat required to convert 1 lb. of 50ºF water to steam is:
 
 
 

4.- The heat of evaporation of 1 lb. of water is equal to _______________________BTU.

5.- Increasing temperature in an open system increases volatility and evaporation.

  a) True b) False

6.- Water expands and contracts with temperature changes.

  a) True b) False

7.- A water-cooled condenser rejects 260,000 BTUh total heat.  Cooling water enters at 72ºF and leaves at 83ºF.  How many gallons are circulating per minute?
 
 
 

8.- A heating coil has a capacity of 300,000 BTUh when circulating 10gpm of water.  If the leaving water temperature measures 150ºF, what is the entering water temperature?
 
 
 

9.- The temperature of 100 lb. of dry air is raised from 75ºF to 165ºF, how many BTU are required?
 
 
 

10.- Air air-cooled condenser rejects 140,000 BTUh total heat.  Air enters the condenser at 70ºF and    leaves at 90ºF.  How many cfm are circulating?
 
 
 
 
 

11.- A 40’ x 60’ wall is constructed on ½” gypsum board a 3 ½” mineral wool and ¾” plywood.  The temperature difference between the inside and outside is 20ºF.  Calculate the BTUh that circulate.