Electric heating – Heating devices – Combined with diverse-type art device
Reexamination Certificate
2000-05-04
2001-07-03
Hoang, Tu Ba (Department: 3742)
Electric heating
Heating devices
Combined with diverse-type art device
C052S472000
Reexamination Certificate
active
06255623
ABSTRACT:
TITLE OF THE INVENTION
A surface heating conduit, in particular for floor heating, and surface heating structure comprising such a conduit
BACKGROUND ART
The present invention refers to a surface heating conduit, In particular for use in floor heating. Further, the invention refers to a surface heating structure comprising such a surface heating conduit.
Radiant panel heating are constructed such that pipes conducting heating media are embedded In a layer of mortar (lime floor or the like). However, these construction materials (lime floor on cement or plaster basis) are disadvantageous in that relatively large amounts of humidity are brought into the building and the drying time can be substantial, thereby hindering the progress of the construction work. Moreover, at temperatures cures near the freezing point, lime floor may freeze when no heating is provided. Yet, heating the lime floor entails further efforts.
In this respect, the use of mastic asphalt as the embedding material for the surface heating pipes is advantageous. Mastic asphalt needs no drying, but requires a rather high working temperature (up to 250° C.) that there is some danger of damaging the placed pipes should they be of plastic material. Presently, mastic asphalt is used in particular for free surface heatings. As a contrivance, the pipes to be embedded into the mastic asphalt are filled with (cooling) water. After the mastic asphalt has cooled and cured this water has to be drained off again. This is time-consuming.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a surface heating conduit suited for embedding in mastic asphalt.
According to the invention, a surface heating conduit is provided with a fluid-conducting inner pipe and a sheathing tube structure surrounding the inner pipe, which, regarding the chosen material and wall thickness, serves as a thermal shield for protecting the inner pipe from external heat influences and which is designed such that, when the surface heating conduit is embedded in a layer of mastic asphalt that is cooling down from its working temperature, the sheathing tube structure is destroyed, thereby protecting the inner pipe against thermal influences deleterious to the functionality of the inner pipe. Here, “destruction” means a degradation of the sheathing tube structure such that the mastic asphalt comes into contact with the inner pipe without the same losing its functionality. Thus, the sheathing tube structure is “sacrificed” by thermal energy being transformed therein to a degree that the proper heating conduit, i.e. the fluid-conducting inner pipe, is protected against destruction.
In an advantageous development of the invention, the sheathing tube structure comprises a heat insulating layer surrounding the inner pipe that is made of a foamed plastic material, and an outer tube of plastic material that encloses the heat insulating layer. The heat insulating layer is of material having a low thermal conductivity such as PE or PP foam. The outer tube, particularly a corrugated tube, is preferably made of HDPE, PP or PA. Other plastic materials having a certain heat resistance may be used.
As an alternative to the foamed plastic material, one may use recycled plastic material, e.g. a regenerated plastic material based on PP or PE. This recycled material is filled into the plastic outer tube or introduced into a space between the fluid-conducting inner pipe and the plastic outer tube.
REFERENCES:
patent: 3724158 (1973-04-01), Knecht
patent: 3758748 (1973-09-01), Reid
patent: 3808400 (1974-04-01), Cornella et al.
patent: 4314772 (1982-02-01), Lestraden
patent: 5573687 (1996-11-01), Tanaka
Dankbar Bernhard
Riesselmann Franz-Josef
Diller Ramik & Wight
Hewing GmbH
Hoang Tu Ba
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