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When there is a need to quickly heat a building under construction, an industrial or other large premises, then the first assistant in this matter can be Heat gun. The unit operates on the principle of a fan heater. Depending on the model, the fuel used can be diesel fuel, gas or electricity. Now we will look at how a diesel heat gun works, its operating principle and scope of application.
Difference between diesel heat guns by heating method
The design of diesel guns of any model is almost the same. There is only one feature that divides the units into two main types - the removal of combustion products. When burning diesel fuel, liquid fuel guns emit smoke with toxic impurities. Depending on the design of the combustion chamber, exhaust gases can be discharged outside the heated room or exit along with the heat. This feature of the design of heat guns divided them into indirect and direct heating units.
Direct heating diesel
The simplest design is a direct-heating diesel heat gun, which has 100% efficiency. The unit consists of a steel casing, inside of which there is an electric fan and a combustion chamber. Under the body there is a diesel fuel tank. The pump is responsible for supplying fuel. The burner is located in the combustion chamber, so no open flame flies out of the gun nozzle. This feature of the device allows the use of diesel engines indoors.
However, when burned, diesel fuel emits acrid smoke, which, together with the heat, is blown out by the fan into the same heated room. This is the reason why direct heating models are used in open or semi-open areas, as well as in places where there are no people. Typically, direct-heating diesel engines are used on construction sites to dry the premises so that the plaster or concrete screed hardens faster. The gun is useful for the garage, where in winter you can warm up the car engine.
Indirect heating diesel engines
The indirect heating diesel heat gun is more complex, but it can already be used in crowded places. Only the design of the combustion chamber differs in units of this type. It is made to remove harmful exhausts outside the heated object. The chamber is completely closed at the front and rear on the fan side. The exhaust pipe is on top and extends beyond the body. It turns out to be a kind of heat exchanger.
A corrugated hose that removes gases is put on the pipe. It is made of stainless steel or ferrous metal. When fuel ignites, the walls of the combustion chamber become hot.A running fan blows on the hot heat exchanger and, together with clean air, pushes the heat out of the gun nozzle. The harmful gases themselves are discharged from the chamber through a pipe through a hose to the street. The efficiency of indirectly heated diesel units is less than that of their direct heated counterparts, but they can be used to heat objects with animals and people.
Most models of diesel guns are equipped with a stainless combustion chamber made of high-quality steel, which increases the service life of the unit. A diesel engine can operate for a long time without overheating its body. And all thanks to the thermostat, since the sensor regulates the intensity of the flame. If desired, you can connect another thermostat installed in the room to the heat gun. The sensor automates the heating process, allowing you to constantly maintain the temperature set by the user.
A diesel heat gun is used to set up a heating system for large buildings. For this purpose, a corrugated hose with a thickness of 300–600 mm is used. The hose is laid out indoors, putting one end on the nozzle. Using the same method, hot air can be supplied over long distances. Indirectly heated diesel guns heat commercial, industrial and industrial premises, train stations, shops and other objects with frequent presence of people.
Infrared diesel
There is another type of unit that runs on diesel fuel, but based on the principle of infrared radiation. Such diesel heat guns do not include the use of a fan in their design. It's simply not needed. IR rays do not heat the air, but the object they hit. The absence of a fan reduces the noise level of the operating unit. The only drawback of infrared diesel is spot heating.The gun is not capable of covering a large area.
Review of popular models
In the store you can find a huge number of diesel heat guns from different manufacturers, differing in power, design and other additional functions. We offer you to familiarize yourself with a number of popular models.
Ballu BHDN-20
The Ballu diesel heat gun of indirect heating rightfully leads the popularity rating. The professional unit is available with a power of 20 kW and above. A special feature of the heater is a high-quality heat exchanger made of stainless steel. AISI 310S steel is used for its manufacture. Such units are in demand in large rooms. For example, the Ballu BHDN-20 heat gun can heat up to 200 m2 area. The efficiency of an indirect heating unit with a power of 20 kW reaches 82%.
MASTER - B 70CED
Among the direct heating units, the MASTER diesel heat gun with a power of 20 kW stands out. Model B 70CED is capable of operating in automatic mode when connecting a thermostat TN-2 and TN-5. During combustion, a maximum temperature of 250 is maintained at the nozzle exitOC. The Master heat gun can heat up to 400 m in 1 hour3 air.
ENERGOPROM 20kW TPD-20 direct heating
A direct heating unit with a power of 20 kW is designed for drying objects under construction and heating the air in non-residential premises. In 1 hour of operation the gun produces up to 430 m3 hot air.
Kerona P-2000E-T
A large range of heat guns is presented by the manufacturer Kerona. The direct heating model P-2000E-T is the smallest. The unit is capable of heating a room up to 130 m22. The compact diesel will fit in the trunk of a car if it needs to be transported.
Repair of diesel guns
After the warranty expires, repairing a diesel engine at a service center will be very expensive. Auto mechanic enthusiasts try to fix many problems on their own. After all, it is stupid to pay a large amount for repairs if, for example, a valve spring has burst and the diesel engine stalls due to lack of air flow.
Let's look at the most common diesel breakdowns and how to fix the problem yourself:
- Fan failure is determined by the cessation of hot air flow from the nozzle. Often the problem lies in the electric motor. If it burns out, then repairs are inappropriate. The engine is simply replaced with a new analogue. You can determine if an electric motor is faulty by checking the working windings with a tester.
- The injectors spray diesel fuel inside the combustion chamber. They rarely fail. If the injectors are faulty, combustion stops completely. To replace them, you need to buy exactly the same analogue in a specialized store. To do this, you need to take a sample of the broken nozzle with you.
- Repairing a fuel filter is easy for anyone. This is the most common failure in which combustion stops. Diesel fuel does not always meet regulatory requirements in quality, and solid particles of various impurities clog the filter. To eliminate the malfunction, you need to unscrew the plug on the gun body. Next, take out the filter itself, wash it in clean kerosene, and then install it in its place.
All breakdowns of diesel units require an individual approach during repair. If you have no experience, it would be better to contact a service center.
The video shows the repair of diesel guns:
When purchasing a heating unit for home use, you need to take into account the peculiarities of its design and the specifics of its operation. It may be wiser to give preference to a gas or electric analogue, and leave the diesel gun for production needs.
