Gas, Diesel and Dual-fuel Heater and Hot Air Furnace
A furnace or hot air furnace is actually a large type of industrial heater that is used in places with a large area, such as industrial halls and public places, due to its high heating capacity and the possibility of proper and quick heat distribution.
If you need a furnace but do not know exactly which furnace with what heating power is best for you, stay with us in the rest of this article to learn more about the technical specifications, capacity, purchase price, and types of available models.
A guide to checking, choosing, and buying a forced / hot air furnace
In the absence of an engine room or a weak performance of the central heating system, the hot air or the forced-air furnaces can be used as heat supply equipment in places such as large halls, poultry farms, greenhouses, factories, workshops, exhibitions, banks, department stores, mosques, etc.
Estimating and Determining the Furnace Heating Capacity
Determining the capacity of the heater or hot air furnace for a project in the cold season is somewhat different based on the climate condition. For example:
Tropical or Hot Climates: In climatic conditions such as Tehran, Mashhad, Semnan, Shahrood, Rasht, Karaj, Kermanshah, Mazar-e-Sharif, Kabul, Shiraz, Isfahan, Sulaymaniyah, Kirkuk, Mosul, Erbil, Aleppo, Damascus, etc., an approximate 40 kcal/h of heating capacity per cubic meter is considered.
Cold Climates: For cold climates in autumn and winter, such as the cities of Tabriz, Urmia, Arak, Hamedan, Zanjan, Yerevan, Baku, Ankara, Khojand, Samarkand, Bukhara, Ashgabat, Dushanbe, Tashkent, etc., an approximate 50 kcal/h of heating capacity per cubic meter is considered.
The formula for calculating the heating capacity of a hot air furnace
QT heating load of each unit in kilocalories per hour
U1 to Un heat transfer coefficient of each surface between the inside and outside of the building in terms of BTU/ft2.hr. oF, which should be determined based on the material of each wall, using engineering reference tables.
A is the area of each of the peripheral surfaces of the corresponding unit that transfers heat to the outside of the building. This area (in square feet) includes walls, windows, doors, and ceilings.
ΔT is the temperature difference between the inside and outside of each unit under normal conditions, which is in °F.
V Total amount of air infiltrating through door or window seams (CFH) in ft3/hr
Constant factor 0.0749: air density in conventional conditions in the English unit system
Constant coefficient of 0.24 specific heat capacity of ambient air in conventional conditions in English units
In the above formula, by calculating the values of all the parameters, you can get accurate results to determine the required heating capacity of heaters and hot air furnaces. Note that the exact values of U and area A for each of the surrounding surfaces must be considered based on specific details in each building and heat transfer coefficient engineering tables.
Types of hot air furnaces in terms of fuel and capacity
There are three main types of furnaces:
Gas hot air furnace
Gasoline or diesel-burning hot air furnace
Double burner hot air furnace
Advantages and Capabilities of Standing Hot-Air Furnaces
The following are some of the advantages of standing hot-air furnaces:
The ability to install an ambient thermostat to accurately control the temperature
Ability to blow the air from the bottom of the device (reverse air blowing)
Direct ventilation, with a damper and the possibility of channeling hot air distribution (in high capacities)
Creating pleasant heat and uniform distribution
They have an electrical panel equipped with control equipment
Low power consumption
The Main Components of the Hot Air Furnace
Each hot air furnace consists of three main parts, which are:
Air-to-Air Heat Exchanger
This part of the hot air furnace is in contact with the flame from the inside and with the ambient air from the outside. These heat exchangers are usually made of cast iron or steel, and the side that is exposed to the air usually has a finned surface that heats up better when the air passes over it (due to the increase in heat transfer levels).
Blower Fan
The fan used in the hot air furnace sucks the air from the place to the outer wall of the furnace, and after passing through the air-to-air heat exchanger, which results in a temperature increase (by 25°C to 40°C), it redirects to the environment.
Furnaces are divided into two types based on the location of the fan, suction and blowing if the fan is placed in such a way that it sucks air from the surface of the heat exchanger, it is called a suction furnace, and if the fan is placed in such a way that it drives the air towards the surfaces of the heat exchanger, it is called blowing or drifting.
The Burner
The heat produced by the burner in the combustion chamber transfers to the air that surrounds the combustion chamber from the outside after passing through its walls and brings it to a temperature of about 60°C.
Gas burners are divided into two types, blower or atmospheric, based on the type, design, and heating capacity of the heater or hot air furnace.
NOTES:
If the hot air furnace consumes gas, a gas filter must be installed in the gas path to the electric valve. The fuel gas used in furnaces is usually municipal gas with a pressure of ¼ pound (PSI).
Suppose the fuel consumed by the hot air furnace is diesel. In that case, it is necessary to install a diesel filter in the way of fuel entering the heater or hot air furnace to prevent diesel impurities from entering the fuel nozzle.
Also, choosing the size, type, and angle of fuel injection from the diesel nozzle is very sensitive and should be done only after consulting with the technical experts of the manufacturing company.
Types of hot air furnaces based on the location of the fan
Types of hot air furnaces are divided into two types, suction and blowing, based on the location of the fan:
Suction furnace: If the fan is placed in such a way that it sucks air from the surface of the heat exchanger, it is called a suction furnace.
Blowing furnace: If the fan is placed in such a way that it drives the air toward the surfaces of the heat exchanger, it is called blowing or drifting.
Advantages of the Hot Air Furnace
Here are some of the most important advantages of a hot-air furnace:
The hot air furnace is equipped with an ambient thermostat and automatically keeps the room temperature at the desired temperature.
The ventilation is formed directly, and the heat is distributed uniformly in the environment.
The hot-air furnace heats the desired environment in a very quick and short time.
They have a special fan for exhausting gas from combustion based on the function of the control limit fan on the combustion chamber.
The hot air furnace does not emit carbon monoxide in the indoor environment due to the complete combustion of gas and having a chimney for the exit of gases from the combustion chamber.
The heat exchanger of the hot air furnace performs maximum heat transfer from the combustion chamber to the circulating air of the environment without smoke and combustion gases entering the place.
Hot Air Furnace Installation Tips
5 things you should keep in mind when installing a hot air furnace:
According to the national building regulations, the return air should not be provided from the kitchen space, restrooms, parking lot, and other closed or polluted spaces such as hospital environments.
The distance between the heater and the nearest wall should be at least 15 cm (6 inches), and the minimum distance between the heater and any flammable materials should be at least 30 cm (12 inches).
It is absolutely not allowed to install the chimney at a distance of less than 5 cm or 2 inches from flammable ceilings or walls.
The access space in front of the device and where the burner is installed is also defined as at least 45 cm (18 inches).
The distance between the heater and the ceiling should not be less than 45 cm.
Buying gas, diesel, and dual-burner hot-air furnaces
Most heating systems take several hours to heat up the environment, but hot air furnaces can heat up the ambient air very quickly, and the ventilation is done directly without any harmful gases, and the air remains clean, which makes the hot air quickly spread evenly in the desired space.
In order to choose and buy the right hot air furnace, you must first determine the required heating capacity and the type of fuel used. On the website of DamaTajhiz HVAC, technical spec of dozens of hot air furnaces from reputed brands, along with their main guarantee, has been provided so you can experience optimal and smart shopping.
Also note that in the specialized HVAC group of Damatajhiz, all the forced air furnaces are only sold in bulk. Therefore, if you want to wholesale any of these products, feel free to contact us.
DamaTajhiz HVAC Group; The best prices and brands of construction equipment
The price of gas, diesel, and dual-burner hot air furnaces
The prices of hot air furnaces are variable based on type, capacity, quality, and after-sales service of the manufacturer of that device. It should be noted that the prices of all furnaces provided on the specialized website of DamaTajhiz HVAC are up-to-date, with an elite discount being already included on them for wholesale purchases. Therefore, the best price for all types of hot air furnaces is guaranteed.
Dear user:
While thanking you for the trust you have in the technical opinions of DamaTajhiz sales experts, it should be noted that the determination and selection of the desired product brand based on history, brand strength, service and product price is ultimately determined by the buyer. But in hot air furnaces, most users and buyers choose and buy best-selling brands such as Energy and Garmasan according to their quality, price and after-sales service.
If, after reading the above material, you have more questions about deciding to buy different types of pool pumps, diatomaceous, and pool pumps, you can contact the pool equipment sales experts at extension numbers 107– 108- 121- 122. Get hot air furnace advice and ask your questions. Because the specialized group of DamaTajhiz HVAC Group provides all kinds of hot air furnaces in the Middle East region, if you need a pool pump for any of the countries in the region, you can place your purchase order with confidence, product guarantee, and reasonable price. Please leave it to our sales experts.
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