What is infrared radiant heating?

There are three basic types of heat transferConduction, convection and radiation. Conduction is the transfer of heat from a hot object to a cold object when two objects with a temperature difference come into contact with each other; a typical example is hot plate heating. Convection is the diffusion of fluids of different temperatures, fusion and heat transfer; the most typical example is the mixing of hot water to cold water heating. Our most common hot air furnace is actually a mixture of convection and conduction. Hot air is brought into the furnace by a fan to bring the temperature of the furnace to a set temperature, a process known as convection; then the hot air transfers heat by touching the surface of the object being heated, a process known as conduction. The common point of conduction and convection is the need for object contact, or the heat source and the heated object in direct contact, or through the air and other media to transfer the energy of the heat source to the heated object. Energy transfer is slow and energy density is limited.
Whereas radiation transfers heat in a completely different way.It transfers energy through infrared light. It is through infrared light that the sun transfers heat energy to the earth. It has the following two basic characteristics:
1. Infrared radiation heat transfer does not require a medium.It is also known as non-contact heat transfer. Since light is an electromagnetic wave, the propagation of electromagnetic waves does not require a medium, and can also be propagated in a vacuum. The infrared light emitted by the heat source irradiates the surface of the heated object and is absorbed by the molecules on the surface, causing an increase in the vibrational energy level of the molecules and raising the temperature.

2. Infrared heating has a high energy density.The energy carried by infrared light is related to its wavelength and the power per unit area of the infrared light source, up to 1000kw/m2. Practical infrared power density can be up to 200kw/m2, and the general infrared heating furnace is designed to be 10-40kw/m2 is very easy to do. And 600 ℃ hot air in 10m / s speed is only 40kw/m2 of energy.

What are the advantages of infrared heating technology?

Based on the differences in heat transfer methods as described above, industrial heating technology using infrared radiation has many features and advantages:

1, infrared heating is very fast. Since the energy of infrared light is directly absorbed by the molecules of matter and the energy density of infrared light is high, the temperature of the surface of an object increases very quickly. This rate is much higher than that of conduction and convection. The latter requires molecular collisions, which are transferred one level at a time through the conversion of kinetic and potential energy.

2. Infrared heating is surface heatin.As mentioned above, infrared radiation heats the surface of an object very rapidly, so that there is a large temperature difference between the surface and the interior of the object. This is a great advantage for the purpose of heating the surface of the object very quickly, because it does not cause large changes in the temperature of the material itself. This saves energy and does not affect the humidity, chemical properties, stresses, etc. of the material. But it also has a disadvantage, that is, uneven illumination, or there are shadows, can cause temperature differences. This is to be compensated by technical means.

3、Infrared heating has a certain degree of penetration.Infrared photons can pass through the surface of the object to a certain depth, and when the molecules within this depth absorb the infrared light, they are heated from the inside out at the same time. This has a great advantage over conduction and convection, not only heating speed, but also largely avoid the phenomenon of skinning and blistering due to surface closure.

4、红外加热有选择性。The infrared band of the electromagnetic spectrum used for heating can be divided into shortwave (0.8um - 1.4um), mediumwave (1.5um - 3.5um) and longwave (3.5-10um). Different materials have different wavelengths of infrared absorption and different heating efficiencies. The penetration ability of infrared rays of different wavelengths is also different. So according to the characteristics of the material, thickness, heating purpose, etc. to choose the use of infrared lamp type, number, etc. to do the most optimal design.

5、Personalisation of infrared emitters . Infrared emitters can be personalised in many different ways, changing shape, size, power, wavelength, etc. to meet the heating needs.

6、Spatial and temporal selectivity and intelligent control of infrared heating : With optimally designed infrared emitters, spatial structure and system control, infrared light can be realised to reach the desired temperature, temperature gradient, at the desired time, at the desired place. This flexible structural design and fast response makes intelligent control and system matching possible.

Why choose quartz glass for infrared heating tubes?

Infrared heating tube lamp material selection is not arbitrary, must be used in infrared transmittance rate is very strong special materials, this material can be more than 1000 ℃ continuous and stable work, and has a good corrosion resistance.

Advantages of quartz lamps: •  High mechanical strength and toughness; •  Chemical stability; •  High power density; •  Convenient wiring; •  Length up to 3.5 metres.

Why choose a gold-plated reflective layer?

In order to better conduct and gather the energy radiated by the heater on the heated material, Levi's infrared emitters add a gold-plated reflective coating (gold coating) on the outer wall of the quartz tube, which greatly enhances the infrared transmittance and thermal effect. The gold reflective coating allows 93% of infrared light to radiate directionally, improving infrared heating efficiency.