High efficiency furnaces and heaters range in annual fuel utilization efficiency (AFUE) from:
a. 94 - 98%
b. 80 - 98%
c. 70 - 75%
d. 60 - 70%
e. 50 - 60%
Answer: B
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Power Engineering Chapter 100
- A type of directly fired space heater is
- In a fin-coil heat exchanger the primary source of heat for the exchanger is
- The power supply for an electric resistance coil furnace is
- One of the biggest heat losses in the warm air furnaces and space heaters is:
- In a warm air heating system, the cold air return registers are located:
- In high efficiency furnaces, if the temperature of the flue gas drops below 65°C, the:
- One of the biggest heat losses in the warm air furnaces and space heaters is:
- A fired heater which is installed on the location where the heat is needed and heats the air directly without the use of any ducting is called a:
- Lowboy furnaces are just over _____ in height:
- In a pulse combination furnace, the stated efficiency is:
- Forced warm air heating systems, as compared to steam or hot water heating systems, are used more extensively to heat residences, small commercial buildings, shops, and stores since:
- In a fin-coil heat exchanger, the heat exchanger is
- One of the disadvantages of forced warm air heating systems is the:
- The advantage of having duct furnaces instead of a large central furnace is:
- In a high efficiency furnace or heater the temperature of the flue gases are _____ in the secondary heat exchanger.
- One of the advantages a forced warm air heating systems has over the steam or hot water heating systems is: