Evolution of Furnace
The idea of using furnace for
central heating purpose is eras old. The earliest idea of central heating home
was introduced by Romans which is known as hypocaust. In their idea they use
lit fire in the corner of the basement and exhaust ventilate the heat through
flue in the walls to the chimneys. This heating system was only suitable for
stone or brick constructed home. It’s too dangerous as it has the possibility
of fire and other life threating hazards.
The general ideas of burning fuel
for furnace was burned wood. Thane in
seventeen century it’s been replaced by coal and using of coal remain till
early 1940s. In 1970 gas become primary fuel and here it started replacing it
due to energy draw back. Todays forced
air high efficiency gas furnace are the most popular and most economical way of
heating homes.
However the furnace which was
using wood and coal requires continues feeding to make heat for home. Usually
required fuel five to six time in a day. Require fuel is feed in the burner and
waste of burnt fuel need to be removed.
High efficiency furnace Raw Material
In construction of today high
efficiency furnace need the raw material which is stainless steel, brass, and
aluminum. Copper and fiber glass. Heat exchanger uses a stain steel to minimize
its corrosion resistance. Furnace cabinet, burner and blower is made up of aluminum
and steel to maintain furnace efficiency and durability. The furnace cabinet is
insulated with fiber glass to avoid heat loss.
How the furnace start working
A request for heating is executed
by thermostat causing ignition of burner and move the heat in to primary heat
exchanger. This heated air is transfer to secondary heat exchanger (only in 90%
or up efficient rating of furnace) and heat is distributed through flue and
ducts. A flue draft blower is placed in the exhaust flue to supercharge the
burners and increase efficiency
Furnace AFUE Ratings
Furnace models can be categories as AFUE (Annual Fuel
Utilization) ratings. Which will determine the cost of energy fuel for heating
with gas, oil or other fuel. That is why the furnace with higher AFUE is the
most economical way to full fill home heating requirements.
Furnace Quality Control
To ensure furnace quality it undergoes some standard series
of furnace quality assurance tests. That includes it complete operation.
Quality check of entire machinery and other component of furnace. Verifying the
heat capacity of furnace along with other durability tests.
Typical efficiency Gas Furnaces
Conventional efficiency furnace have commonly efficiency
rating start from 78%. The conventional efficiency gas furnace generally use a
naturally aspirating burner instead of pilot lit system.
Modern furnace have electric ignition system and consume approx.
3 to 5 present less energy than a furnace with regular pilot ignition light.
Typical-efficiencygas furnace with induced draft fan
The powered
exhaust is used by typical standard efficiency furnaces, generally depend on
built in induced draft fan. With greater heat exchange and zero dilution of air
and greater resistance to flow while the off cycle, regular efficiency is much
higher for today's standard-efficiency furnaces than for furnaces equipped with
pilot lights. Energy savings are between 23 and 28 percent.
These systems will be ventilated through a chimney or out the facet wall
of the house using best chrome steel. Some issues are related to the use of
high-temperature plastic vent pipes with typical-efficiency furnaces. Rules
could forbid the use of bound vent materials in your space. You should discuss
all choices together with your native service person, approvals agency or gas
utility.Installation codes could need transferal a combustion air provide to the
furnace from outdoors.
Compressing type highefficiency gas furnace
The burners are like those on typical furnaces, associated draft is
equipped by an elicited draft fan. However, further heat-exchange surfaces
product of corrosion-resistant materials (usually stainless steel) extract heat
from the combustion by-products before they're exhausted. During this
compressing heat exchange section, the combustion gases are cooled to some
extent at that the water vapor condenses, so emotional further heat into the house.
The condensation is piped to a floor drain.
Because no chimney is required, installation prices are reduced. The flue
gas temperature is low enough for the gases to be ventilated
A PVC or plastic pipe out the facet wall of the house. Depending on the
design, these furnaces will dissipate to thirty 8 % less fuel than older gas
furnaces equipped with pilot lights. Moreover, polluting emissions free into
the surroundings also are reduced.
Some compressing furnaces or boilers disagree only therein they use a
pulse combustion technology to ignite little amounts of gas at frequent
intervals.
Unlike typical and standard-efficiency furnaces, whose efficiency
decreases with furnace over sizing, compressing furnaces are literally slightly
additional economical once they are outsized and run for shorter periods. Thus,
if you're selecting a replacement compressing chamber, you'll be able to get a
furnace that's slightly larger than the house heat demand while not suffering
associate “efficiency penalty.”
