fuels ppt3 1-2

What are the two operating principles for any chimney or flue system?

• Remove combustion products to the outside and draw in air for combustion.

• Increase combustion temperature and decrease air flow.

• Reduce smoke emission and increase fuel efficiency.

• Enhance heat retention and minimize air intake.

What principle do chimneys and flue systems work on?

• Hot gases rise, creating a pressure difference called 'up draught' via convection.

• Cold air descends, creating a pressure difference called 'down draught' via conduction.

• Hot gases fall, creating a pressure difference called 'down draught' via radiation.

• Cold air rises, creating a pressure difference called 'up draught' via diffusion.

What is the basic concept of a chimney or flue system?

• To create an up draught to get rid of fumes

• To circulate air within a room

• To cool down the building

• To provide lighting

What are the two types of flue designs mentioned?

• Natural draught and room sealed

• Mechanical draught and open sealed

• Electric draught and closed sealed

• Manual draught and air sealed

What is the primary function of open flues in heating appliances?

• To cool the appliance

• To provide electricity

• To create an up draught for combustion

• To store fuel

How is air for combustion supplied in appliances with open flues?

• Through a closed system

• From the room where the appliance is located

• Directly from the fuel source

• From a built-in air tank

What must be provided to the room and appliance for proper combustion in open flue systems?

• A water supply

• A vent for air

• An electrical outlet

• A fuel injector

What is the purpose of a fan in an open flue with forced draught?

• To cool down the appliance

• To create a positive up draught

• To reduce noise levels

• To increase fuel efficiency

What is the main advantage of room sealed (balanced) flues compared to open-flued appliances?

• They are cheaper to install.

• They are more energy efficient.

• They are safer because the air does not enter the room.

• They require less maintenance.

How do room sealed (balanced) flues draw air for combustion?

• From inside the room.

• From a separate air supply.

• Directly from outside.

• Through a chimney.