Progress Test 1 Terms Flashcards
Annualized average efficiency of a fuel fired appliance, taking into account the effect of on-off operation.
AFUE (annual fuel utilization efficiency)
The velocity at which a flame propagates through a flammable gas-air mixture
Burning Speed
They have a sharp penetrating odor and can irritate the membranes of the nose and throat
Aldehydes
The unit of measure of the volume rate of air flow
CFM (cubic feet per minute)
Products of combustion plus excess air dilution air that passes through a vent
Flue Gas
Air that enters a draft hood of a natural draft gas-fired furnace and mixes with the combustion products
Dilution Air
Condition which exists when the flame of a combustion reaction comes into contact with a colder interior surface of the combustion chamber
Flame Impingement
The rate at which a device can add heat to a substance, expressed in BTUs
Heating Capacity
The minimum temperature at which a gas and air mixture will ignite
Ignition Temperature
Those fuel gases that remain a liquid under pressure, including butane and propane
LP Gas (liquified petroleum)
The approximate heating value of butane gas
3200 BTU/Cu. Ft.
Small flame that is utilized to ignite the gas at the main burners
Pilot
Combustion air that is mixed with the gas in a Bunsen-type burner before leaving the port
Primary Air
Combustion air that mixes with the burning gas primary air mixture in the flame zone
Secondary Air
Positive change in temperature of air passing through a heat exchanger as a result of heat transfer
Temperature Rise
Device which keeps the pilot lit
Thermocouple
Control device that opens or closes an electrical circuit in response to changes in temperature
Thermostat
Ratio of the weight of a given volume of the gas to the weight of the same volume of standard air
Specific Gravity
Approximate heating value of natural gas (methane)
995 BTU/Cu. Ft.
Precision drilled hole in a spud that is issued to control the flow of gas to a burner
Orifice
Rapid oxidation of fuel-gas accompanied by the production of heat, and or light
Combustion
Scale used to measure gas pressure using a manometer
Inches Water Column
Highly toxic gas that is odorless, colorless, has no taste, and will kill
Carbon Monoxide
Added to fuel gases to help detect small leaks by smell
Odorants
The amount of heat required to raise the temperature of one pound of water by one degree Fahrenheit
BTU (British thermal unit)
True or False. Excess air is required to assure that there will be more than enough oxygen present to prevent incomplete combustion. True or false
True.
Excess air
