17165592
Description
Flashcards by Andrew Adams, updated more than 1 year ago
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Created by Andrew Adams
over 6 years ago
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| Question | Answer |
| AFUE | Annual Fuel Utilization Efficiency: a ratio of heat generated by a heating system to the energy used |
| damper: HVAC Duct system | a plate or louvers installed in a duct that permits control of how much air flows in a duct; may be manual or motor operated. Used to control zones in a heating system |
| damper: barometric | a device used to control draft in an oil-fired appliance vent connector when using a masonry chimney as a vent; opens and closes based on the pressure in the vent connector. |
| direct exhaust appliance | a fuel-burning appliance that obtains combustion air from inside the house and expels combustion outside |
| direct vent appliance | a fuel-burning appliance that obtains combustion air from outside the house and expels combustion outside |
| forced draft | using a fan at the beginning of a vent system to push exhaust/gasses through the vent; also 'positive pressure draft'. |
| induced draft | pulling combustion gasses through a heat exchanger to draft up a flue; or the process of using negative pressure to pull gasses through a vent |
| mechanical draft | a vent system the uses an electric fan to assist in expelling combustion gasses; can be either negative or positive pressure |
| natural draft | the tendency of gasses to rise in a chimney or vent due to stack effect |
| stack effect | hotter gasses are at a lower pressure and rise above cooler gasses |
| flue | a vertical passage inside a chimney used to expel combustion gasses |
| hydronic heating | a system using water or steam to distribute heat throughout the house |
| mainfold vent connector | a vent connector in which two or more vent connectors are joined before joining the vent |
| combustion vent | the final vertical component of a vent system |
| vent connector | a component that conducts combustion products from an appliance to a vent |
| vent system | the passageway that conducts combustion products from a fuel burning appliance out of the house |
| flue collar | the draft hood or point of collection for combustible product at the fuel-burning appliance |
| combustion air | fresh air drawn into the system for a fuel burning appliance |
| primary air | combustion air drawn in for proper burning of fuel in the combustion chamber |
| dilution air | air brought in to mix with vent gasses to create proper draft and cool the exhaust |
| net free area | the opening used to draw in combustion air |
| standard method gas appliance | drawing air from the same room as the appliance(inside): 50 cubic feet for 1000 Btu/h |
| inside air adjacent rooms gas appliance | openings within 12 inches of ceiling and floor; 1 square inch per 1000 Btu/h |
| inside air different stories gas appliance | one small opening measuring 2 square inches per 1000 Btu/h |
| combustion air same room oil furnace | 50 cubic feet for 1000 Btu/h; adjacent rooms count if no door is present |
| inside air adjacent rooms openings oil furnace | 2 openings, ceiling and floor; 1 square inch per 1000 Btu/h |
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