what kind of metal to use for a furnace

Furnace

Background

A furnace is a device that produces oestrus. Not only are furnaces used in the home for warmth, they are used in industry for a variety of purposes such as making steel and estrus treating of materials to alter their molecular construction.

History

Central heating with a furnace is an idea that is centuries old. One of the earliest forms of this thought was invented past the Romans and called a hypocaust. It was a grade of under-floor heating using a burn in 1 corner of a basement with the exhaust vented through flues in the walls to chimneys. This class of heating could merely exist used in stone or brick homes. It was also very dangerous because of the possibility of fire and suffocation.

Furnaces generate heat by burning fuel, but early on furnaces burned wood. In the seventeenth century, coal began to replace wood every bit a master fuel. Coal was used until the early 1940s when gas became the primary fuel. In the 1970s, electric furnaces started to supersede gas furnaces because of the energy crunch. Today, the gas furnace is all the same the most pop grade of home heating equipment.

Woods and coal burning furnaces required constant feeding to maintain warmth in the home. From early forenoon to tardily at dark, normally 3 to 5 times a day, fuel needed to be put in the furnace. In add-on, the waste product from the ashes from the burnt wood or coal must be removed and tending.

Raw Materials

Today's mod furnace uses stainless steel, aluminized steel, aluminum, brass, copper, and fiberglass. Stainless steel is used in the rut exchangers for corrosion resistance. Aluminized steel is used to construct the frame, blowers, and burners. Brass is used for valves, and copper in the electric wiring. Fiberglass is used insulate the cabinet.

Design

The original gas furnace consisted of a heat exchanger, burner, gas command valve, and an external thermostat, and there was no blower. Natural convection or forced air menstruation was used to circulate the air through big heating ducts and cold air returns to and from each room. This arrangement was very inefficient—allowing over half of the heated air to escape up the chimney.

Today'south gas furnace consists of a heat exchanger, secondary heat exchanger (depending on efficiency rating), air circulation blower, flue draft blower, gas control valve, burners, pilot low-cal or spark ignition, electronic command circuitry, and an external thermostat. The modern furnace is highly efficient—80-90%, allowing simply 10-xx% of the heated air to escape up the chimney.

When heat is requested from the thermostat, the burners light and throw heat into the primary heat exchanger. The heated air and so flows through the secondary heat exchanger (90% efficient furnace only) to the exhaust flue and chimney. The average furnace has three heat exchangers each producing 25,000 BTUs for a total of 75,000 BTUs. A flue draft blower is placed in the frazzle flue to supercharge the burners and increment efficiency. The heat exchangers perform two functions: transfer heated air from the burners to the domicile and allow unsafe frazzle

i. An 'S"-bend primary heat exchanger. 2. Secondary rut exchanger. 3. In-shot burners. 4. Gas valve. 5. Typhoon motor. 6. Fan motor. 7. Ignition system. eight. Steel cabinet. 9. Exhaust pipe.

gases to escape upwardly the chimney. The transferred heated air is circulated throughout the home by a big blower and heating ducts.

The Manufacturing
Process

1. The chief heat exchanger is formed from two dissever pieces of 409 stainless steel canvas. Each half is formed into shape by a 400 ton hydraulic press. The two halves are then fused together by a 25 ton hydraulic press.
2. The secondary heat exchanger is formed from 29-iv°C stainless steel tubing and fins. The fins are welded to the tubing to form a radiator type configuration.
3. The primary heat exchanger is crimped to the secondary oestrus exchanger through a transition box. The flue typhoon blower is attached to the secondary heat exchanger.
4. The burners are constructed of aluminized steel and go far at the constitute preformed. They are then attached to a plate on the input side of the primary heat exchanger. There is one burner for each estrus exchanger in the furnace.
5. The vendor supplied gas control valve is mounted to the heat exchanger and burner assembly. It is connected to the burner through a pipe.
6. The air circulation blower housing is formed through the aforementioned hydraulic press formation as the primary heat exchanger. The vendor supplied motor and squirrel cage rotor are continued and attached to the blower housing with brackets.
7. A plate is then attached for mounting the blower associates to the heat exchanger assembly. Another mounting plate containing the vendor supplied furnace control circuitry and transformer are attached to the blower housing.
8. The air circulation blower assembly is and so mounted to the rut exchanger associates with screws and nuts.
9. The cabinet consists of two doors and the cabinet housing. The cabinet housing is supplied as a flat pre-painted canvas of steel and placed in a hydraulic press to form a three sided configuration. Sheets of fiberglass insulation are glued to the sides of the cabinet.
10. The cabinet is installed around the furnace assembly and secured with screws and nuts. The doors are installed on the front of the cabinet assembly. The completed assembly is boxed and prepared for shipment.

Quality Control

Each completed furnace undergoes an extensive serial of tests. Checks for proper operation of the flue draft and air circulation blowers are performed. The gas valve is checked for proper operation. The estrus output of the furnace in BTUs is measured. A dielectric exam is performed for shorts.

Past products/Waste

Scrap metallic from cutting and forming operations are collected and sent to recycling plants for reclamation. Whatsoever excess piping is either reused or discarded. Lacking steel sheets can be sent back tot he manufacturer and reformed, depending on the extent of the harm. The majority of the components of the furnace are able to be recycled.

The Future

Furnaces accept come up a long style in the past 30 years. A primary focus by manufacturers is zone control of every room in the dwelling. Each room volition have a thermostat that volition regulate estrus flow to that individual room. Equally technology advances, these thermostats will be able to process vocalization commands or commands placed through a cell phone or reckoner.

Ernst Southward. Sibberson

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Source: http://www.madehow.com/Volume-7/Furnace.html

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