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• A residence has an estimated heat loss of 80,000 BTU/hr at winter design temperatures. A gas fired forced air furnace is installed. What is the approximate fan flow rate desired? Solution
  
  
• A building code requires 800 cfm outside air ventilation for a particular small commercial building. If the outside winter design temperature is 10°F, and space comfort temperature is 72°F, what additional heating load does this requirement impose? Solution

• What duct cross section is required for 600 cfm if the vleocity is to be less than 1200 fpm? Solution

• Estimate the heat loss from a simple warehouse building, 50 feet long by 30 feet wide by 10 feet high. the walls are uninsulated concrete block. The roof has a few inches of insulating glass fiber batts. There are four 3' x 6" windows with single pane glazing. Design temperatures are 70°F inside, 15°F outside. Solution
  
  
• Alternately, a U-valve for the building can be calculated. This is convenient if there is a need to investigate heat loss at various temperature combinations. Solution

• What is the friction pressure loss in 250 feet of round (14-inch D) duct with 1000 cfm flowing? Solution
  
  
• Determine a suitable duct diameter for 100 foot section of duct carrying 600 cfm, subject to the nominal constraint that H be approximately 0.1 inches H₂O per 100 feet. Solution

• Five hundred cubic feet per minute (cfm) of air are flowing through a 12-inch diameter low pressure warm air heating duct. what is the approximate Reynolds Number? Solution
  
  
• Five hundred cubic feet per minute (cfm) of air are flowing through rectangular duct of width 10 inches and height 8 inches. What is the approximate Reynolds Number? Solution