Sectional heating radiator

FIELD: power industry.

SUBSTANCE: sectional heating radiator includes supply and discharge aluminium headers for heat carrier passage and aluminium tubular sections as heat sinks; the new feature is that external and internal surfaces of heat sinks, as well as internal surfaces of supply and discharge headers are provided with coating from aluminium oxide, which is applied by plasma chemical method; at that, coating thickness of external surfaces of heat sinks is 5…10 mcm, and that of internal surfaces of headers is 20…100 mcm.

EFFECT: increasing radiation coefficient, which allows reducing the surface area of radiators, reducing the number of sections or heat carrier flow rate, reducing corrosion and erosion wear and improving ornamentality without any additional coating.

 

The invention is intended for use in heating engineering, in particular in the sectional aluminum radiators for hot water Central heating residential, public and industrial buildings.

There are various designs of heat exchangers (radiators), connecting to the Central heating system, basic elements of which is a channel for passage of the heat carrier and heat-release surface. Heat exchange device may be performed, for example, in the form of a pipe located on the edges (see author's certificate 1461570, MCL421D 53/02). Its disadvantage is the low heat dissipation because the area of the heat-release surface of the partition is too small.

The closest technical solution is a sectional radiator home heating system, aluminum extruded profiles, containing inlet and outlet manifolds (see patent application EN 2008101572). The inner surface of the channels of the radiator for corrosion protection equipped with corrosion-resistant coating, and the outer heat-release surface of the radiator covered with powder paint. The disadvantage of the prototype is the low heat dissipation, associated with a low heat transfer coefficient of the material of the heat sink, and a small service life of the radiator, which is due to the lack of erosion the th protection of internal channels, which moves the coolant - water containing large amounts of chloride and other chemical compounds and mechanical impurities (sand).

The objective of the invention is to improve the heat transfer of the aluminum heat sink and increases service life by reducing erosive wear.

This object is achieved in that in the known radiator containing inlet and outlet aluminum reservoir for the passage of coolant and aluminum tubular sections as heatsinks, according to the invention the outer and inner surfaces of the heat sinks, as well as the inner surface of the inlet and outlet manifolds are made with a coating of aluminum oxide deposited by plasma-chemical method, and the thickness of the coating outer surfaces of the heat sinks is 5 to 10 μm, and the inner surfaces of the collector - 20...100 microns.

It is known that when heated bodies radiate energy. The amount of heat transferred by radiation becomes significant at higher temperatures or under conditions when the heat transfer by other means is difficult, in particular when the free convection (see Mukhachev GA, Shchukin VK Thermodynamics and heat transfer. - M.: Higher. HQ., 1991. - 480 C.). Radiation opaque bodies has a superficial character, i.e. the radiation energy of the particles in the surrounding environments, which gets only emitted a thin surface layer. Radiation is estimated surface density of the radiation flux that is, the body's Ability to radiate energy can be characterized by the degree of blackness of the body

ε=E/E0

where: ε is the degree of blackness;

E - flux density of the radiation of a real body;

E0the flux density of black-body radiation.

The degree of blackness depends on the nature of the body, temperature, surface roughness, and for metals from surface oxidation. Oxide film on the metal surface has a significant impact on its degree of blackness. The formation of oxides on the polished surface of the aluminum increases its degree black from 0.05 to 0.8, and more.

The emissivity of a real body is defined as:

C=ε

where the Co - factor black-body radiation, (5,67 W/m2To4),

ε is the degree of blackness.

The authors tested (heat transfer) emissivity coatings of aluminum oxide having a different thickness. The aluminum surface of the heat sink on delivery have degree black ε=0,1. On the outer surface of the heat radiator inflicted oxide coating of different thickness. Measuring the degree of blackness was performed on thermogravimetry TRM-I. the Results of the measurements are presented in the table.

No. of samples1234567
The coating thickness, microns351015202530
The degree of blackness ε0,30-0,750,84-0,850,82-0,840,79-0,810,71-0,750,67-0,700,55-0,60

Experimental research has shown that when the thickness of the coating is from 5 to 10 μm, the heat sink surface has the highest degree of blackness 0,82-0,85 with variation across the sample surface is not more than 5%.

When the coating thickness is less than 5 μm, the degree of blackness has a large spread on the surface of the sample (up to 50%)due to uneven coating.

With the increase of coating thickness more than 10 μm, a decrease in the degree of blackness, due to the lower thermal conductivity of the coating, i.e. a decrease in the temperature of the surface is resti.

An example of a specific implementation.

Parts aluminum radiator aluminum alloy AD-1 (two manifold and tubular sections are immersed in different baths with alkaline aqueous electrolyte (Si2O3+KON) and treated under different technological regimes. The junction point of the collectors with tubular sections, and location of the alleged connection of the radiator with external pipes, inlet coolant, isolate the fluoropolymer film. To detail secures the electrode to which is supplied a positive voltage potential from installing plasma-chemical oxidation, and tub - negative. Oxidation leading to alternating current.

Coating on interior and exterior surfaces of the heat sinks heatsink thickness of 5 to 10 μm was carried out under the following conditions oxidation: the current density i=15A/DM2; the ratio of the cathodic and anodic component of the current Ik/Iaor =0.6; processing time t=20 minutes

A coating of aluminum oxide of a thickness of 20 to 100 μm on the inner surfaces of the reservoir to increase its hardness and, therefore, reduce erosive wear was formed when the current density i=25A/DM2, the ratio of the cathodic and anodic component of the current Ik/Ia=1, the processing time t=50 min Hardness collectors in this mode of application is 25 HPa, C is the account of the translation of the β-phase of Al 2O in α-phase.

In the operation of the radiator such hardness reduces its thickness due to erosion wear of not more than 5 μm in the year (depreciation collector without covering up to 0.5 mm per year).

After coating, washing and Stripping of the joints, parts arrive at the Assembly.

Sectional heating radiator made of aluminium alloy with a coating of aluminum oxide surfaces of the heat sinks with a thickness of 5 to 10 μm has a degree of blackness, increased to 0.85, which reduces the area of the radiators-radiators, i.e. to reduce the number of sections or reduce the coolant flow. The oxide coating of the inner surfaces of the collectors reliably protects the radiator from the erosive wear in a long time.

This radiator does not require additional decorative coating outer surfaces, so as aluminum oxide performs this function.

Sectional radiator, containing inlet and outlet aluminum reservoir for the passage of coolant and aluminum tubular sections as heatsinks, characterized in that the outer and inner surfaces of the heat sinks, as well as the inner surface of the inlet and outlet manifolds are made with a coating of aluminum oxide deposited by plasma-chemical method, and the thickness of the p the closure of the outer surfaces of the heat sinks is 5-10 microns, and the inner surfaces of the collectors of 20-100 μm.



 

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