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Competent. Consistent. Constructive.

 

A Joule is a Joule and will always be a Joule.

 

It only depends on what you can make of it

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Convert energy.

 

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SURFACE LOAD

The term "surface load" is used to mean a quotient of power and surface. The surface load is mostly specified in 'W/Cm². The selection of the surface load is a function of the type of heating element on the one hand and the function of the type of the fluid on the other hand. The worse the fluid can dissipate the heat from the surface of the heater or the more thermally sensitive the fluid is, the lower must the surface load be selected. While the transferable quantity of heat is limited by the medium in traditional heat exchangers, the dissipated quantity of heat is constant in case of electrical heating elements. The consumed electrical power is almost completely transferred to the fluid. If the heat transfer is hindered (i.e. the surface load is too high for this case), the fluid (and the heating element) will overheat. Different heating element designs have different maximum surface loads:

  • Exchangeable ceramic cartridges max. approx. 6 W/cm²
  • Uncompacted heating elements with a metal jacket max. approx. 8 W/cm²
  • Compacted heating elements max. approx. 20 W/cm²
  • High-capacity ceramic cartridges max. approx. 100 W/cm²


These maximum surface loads can only be achieved if the proper fluids are used.

The values below have turned out to be useful in practice for the following fluids:

  • Water 0°dH max. 20 W/cm²
  • Circulating water, low-oxygen, VDI 2035 max. 10 - 15 W/cm²
  • Drinking water < 18°dH max. 6 W/cm²
  • Drinking water > 18°dH max. 3 - 4 W/cm²
  • Heat transfer oil max. 4-10 W/cm²
  • Fuel oil EL/ diesel max. 4 W/cm²
  • Colza oil max. 4 W/cm²
  • Hydraulics oil max. 1 - 2 W/cm²
  • Heavy oil max. 2 W/cm²
  • Milk max. 1 W/cm²
  • Honey max. 0.5 W/cm²


Other fluids are designed similarly. Basically, the maximum admissible surface loads can be calculated for fluids whose material data is known. Also, this is required by the standard (DIN 4754) for heat transfer oil systems with organic fluids. The calculation must include the fact that the heat energy is sufficiently dissipated in areas with a bad flow. In practice, this will lead to such high reductions that the above-mentioned values can be used for common designs without an exact calculation

Let us talk about it!

Give us a ring!
After all, we do not sell
nails.

E-Mail info@heatsystems.de
Phone: 02265 99 70-0
Fax: 02265 99 70-70

News

ISO 9001:2015

heatsystems has just passed the audit for the new ISO 9001:2015

More Info

blocked filetypes in mails

potentially dangerous
filetypes are blocked

More Info

News

Events

PRC Europe 2017

heatsystems exhibits at the PRC europe in Haburg.

From May 22nd to 23rd 2017.

More Info

Powtech 2017

heatsystems exhibits at Powtech 2017.
September 26th to 28st 2017

More Info

Events
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