Boilers and Flues Flashcards
(14 cards)
What does a boiler do?
Heats water for radiators in rooms and for washing/ bathing
What fuels does a boiler use? (Various)
natural gas, oil, LPG, solid fuel
What is maximum temperature to avoid boiling?
85
Define a CONVENTIONAL boiler
Used by all wet central heating systems. Has a hot water cylinder for bathing/ washing. Household will pay for heating of full cylinder, regardless of use.
Define a COMBINATION boiler
aka ‘combi’. Can be fuelled by LPG, gas, oil. Provides heating/ hot water. Extra exchange allows for hot water from mains supply. Households only pay for actual use - heats water instantaneously.
Define a CONDENSING boiler
has a large heat exchanger, captures heat from flue gases that leave property - reduces wasted energy and is more effiicent. Can be used in conventional/ combi boilers, oil and LPG
Define a BIOMASS boiler
Burns lump wood logs. Uses wooden pellets to provide heating via wet central heating and domestic hot water. operate more continously than gas, oil, LPG boiler and need large accumalation tank for storage of hto watre - due to this, it is uncommon in domestic properties.
Name 4 types of SOLID FUEL boiler
- Open fire back boiler
- Closed back boiler
- Free standing automatially fed boiler
- Free standing Manually fed boiler
Where can solid fuel boilers be placed
Some are positioned in chimney breast (back boiler) and some are free standing
What is a flue?
a duct, pipe or opening in a chimney for conveying exhaust gases from a fireplace , furnace, heater, boiler or generator to the outdoors
Why would an electric heater not need a flue?
Gas fires, heaters and water ehaters create PRODUCTS OF COMBUSTION which must be removed
How does an open flue work?
Takes air from inside room and uses in combustion. Think boilers and fires - products of combustion must be removed. This usually has a natural draught.
How does a balanced flue work?
The appliance is sealed off from the room. can be used with gas fires, water heaters and boilers situated on an external wall. Comprises of a metal duct with 2 pipies - one draws air in, and the other transports products of combution outside. The balance of air in and out means the pressure is the same
How does a balanced flue with fan assistance work?
This improves the efficiency of boiler/ heater. Masinly seen on new build properties- as plume is seen when working, extended flue can assist with this
