Technical Overview

Advantage of HSWG products

Advantage of HSWG drying method

 Advantages compared to the hot air drying method

 - An eco-friendly drying method as it does not use fossil raw materials, which are the main causes of air pollution and global warming. 

  1. Reduces energy efficiency by more than 50% compared to hot air drying method
  2. Environmental facilities not necessary with reduced toxic gas emission
  3. Prevents risk of fire and improves work environment (the atmospheric temperature of the drying furnace is low due to product-oriented heat source concentrated method)
  4. A simple system for easier maintenance and reduced management costs
 Advantages over systems of competitors (electric heater) 


  1. HSWG products can be applied to industrial dryers and secure irradiation distance (20M).
    - Products on the market have short irradiation distance, making them difficult to use for industrial applications
  2. Provides far-infrared radiation energy and emissivity suitable for industrial drying with in-house patent
  3. THREE TECH holds a patent for “Compatible, fast installation technology” capable of minimizing the installation period

HSWG actual use Data (for high-temperature 180℃)

■ Time to reach target temperature (180℃)

    - 10 minutes after system operation

■  Time to retain target temperature (180℃) 

    - 20 minutes, specify drying time

■ Upper, middle, lower temperature deviation 

    - Within -5℃

■ Comparison of painted product temperature and atmospheric temperature

    - Painted product temperature is higher by 30℃ or more

Technical difference between Heat Spreader module and other far-infrared ray heaters

1. Applied radiation conversion materials

  • Heat Spreader Module-Nonstoichiometric compound : The form of the bond between atoms is unstable, which can be converted into a very small energy source
  • Other far-infrared heaters-Stoichiometric compounds : A large amount of energy must be input for conversion since the form of the bond between atoms is stable. 

2. Radiation

Based on the radiation items in the table above, radiation is proportional to the cross-sectional area of the heat transfer part and four times the heat transfer temperature.

  • Heat Spreader module - 100mm diameter, 970mm length with cross section of 100 x 3.14 x 970 = 304,580㎟ 
  • Existing far-infrared ray heater-10mm diameter, maximum 900mm quantity, 5 cross-sectional areas of 10 x 3.14 x 900x 5 = 141x300㎟

Heat transfer temperature 

  • Heat Spreader module - Downward radial structure maintains over 400 degrees without loss of temperature of the heat transfer part
  • Existing far-infrared ray heater- The generated heat is continuously released into the atmosphere. Since the applied radiation converting material is directed toward the atmosphere, the difference in radiation amount is large depending on the atmospheric temperature within the dryer. Suppose the atmospheric temperature is 60 degrees, substituted into the aforementioned formula: 

    Hit Spreader module: (400 + 273.15)/100 to 4 square (or ((400+273.15)/100)4 is about 2,053
    Existing far-infrared heating: (400 + 273.15) / 100 to 4 square (or ((400+273.15)/100)4 is about 123

    Heat Spreader module has 16 times or more radiation

Considering the cross-sectional area and heat transfer temperature, the radiation amount is 32 times or more that of existing far-line heaters

Thermal conductivity
b : Distance between heat transfer sections
A : The cross-sectional area of the heat transfer or the contact area of the fluid by supplying heat energy
A0 : Cross-sectional area of water heat pump
a : Heat transfer coefficient
ε : Emissivity of heat transfer
ε0 : Radiation of water heat pump
T : Heat transfer temperature
T0 : Water hydrothermal temperature (4.88 is an integer in dimension ()) (

Nuclear terminology dictionary


Substance emits energy from electromagnetic waves in response to temperature.
This is called radiation. Metal radiation is caused mainly by motion of electrons and has a short wavelength emission peak of less than 1㎛.
In non-metals, such radiation is caused by vibration of molecules, atoms or lattice, where emission rate is high in long-wavelength and the amount of energy created is high.
Solid and liquid radiation is a continuous spectrum, but in gas it is a discontinuous bright-line spectrum.
The total radiant energy E generated from a unit surface of an abnormal object of a black body, which fully absorbs incidental radiation, is proportional to the square of the absolute temperature of the surface and is expressed as E = σT4, where.
σ is the Stefan-Boltzmann constant and its value is 5.67×10-8 W/m2K4.
The radiation of an actual object smaller than a black body. There are many objects that use E = εσT4, which is called a gray body. ε(<1) is called emissivity.

[Naver Knowledge Encyclopedia] Radiation (Nuclear Terminology Dictionary, 2011., Korea Atomic Energy Industry)

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