DE3028793A1 - Buried insulated district heating pipes - have supply and return tubes superimposed vertically with horizontal supports attached to outer insulation - Google Patents

Abstract

The supply and return pipes (1,2) for a district heating system are buried in a trench below ground level with the return line (2) above the supply line (1). Both are formed by steel tubes and are enclosed in rectangular section outer tubes (1',2') each enclosed by an aluminium foil layer (3,4) to prevent emission of heat. Between them is a horizontal aluminium foil layer (10) also preventing heat emission. The whole is embedded in plastics foam insulating material (5) enclosed by a plastics casing (6) with a cover (8) overlapping a base (7), and welded together. The foam insulation is thicker above the pipes than below. The pipes are supported in the trench by horizontal side supports.

Description

District heating management

The invention relates to a district heating multiple line according to the umbrella term des P a t e n t a n s p r u c h e s 1.

in known lines of this type, the flow and return lines are located practically at the same height, d. H. side by side.

Vies requires a relatively complicated assembly of the outlets for example, to laterally located connections of consumers. Continue to be while the inclined flow line and the considerably cooler return line with regard to the thermal insulation is treated in the same way as the distance between these oeiden lines is practically the same from particularly kudlenden surrounding areas.

This also applies to those in "Fernwärme International - FWI", 1980, issue 1, p. 27, shown district heating pipe type B, if there also above the adjacent one Additional thermal insulation is provided for flow and poop lines. Publicly the flow and return lines are not combined into a multiple line.

The invention is accordingly based on the object of a district heating multiple line according to the preamble of claim 1 to create an easy assembly seldom outflows enabled and the one on the different Temperatures of the flow and return lines are based on different inclinations both lines for heat exchange with particularly cooling surrounding areas wearing.

The inventive solution of this issue consists in the characteristic Features of the P a t e n t a n s p r u c h s 1.

In the invention, the return line is advantageously as it were to reinforce the thermal insulation between the flow line and the - as was recognized - particularly cooling surrounding areas above the district heating pipe used.

A possibly resulting increase in the cooling of the return line can, since this returns the heating medium to the heat generator, accepted or by "asymmetrical" design of the heat insulation according to patent claim 4, i.e. reinforcement of the thermal insulation above the RacKlaufl.eitung, can be eliminated.

The assembly of lateral outlets that do not bend or bend can be on the flow or return line is determined by the location of each other line is not affected.

^ Advantageous training and developments of the invention are the subject of subordinate claims.

Two embodiments of the invention are based on the drawing explained, the figures of which are cross-sections through a double and a triple district heating pipe demonstrate.

If you first consider Sig. 1, the flow line 1 is below the return line 2. Both are made of steel and run in jacket pipes 1 ' or 2 'from GES or VPS, each with a radiation-reducing envelope 5 Szw. 4 off Surrounded by aluminum foil and embedded in the thermal insulation 5 made of iUii-chaum.

The solid outer shell 6 made of PVC is here as a box with the channel-shaped The lower part 7 and the upper part 8 overlapping this like a cover; both are welded at 9. The insulation 5 is produced in a simple manner by foaming the box 6.

Between the shell rims 1 'and 2', the nier elongated cross-sections have the largest cross-sectional dimensions running horizontally, lies as Additional radiation protection for the feed line 1, the aluminum foil 10.

As can be seen, none of the work 1 and 2 interferes with the Wiontage lateral outlets 12 on the other line, which without bend on the District heating lines run through the earth 11, for example, to consumers. In contrast, in the case of the well-known specialist lines, the outlets initially run vertically upwards and only horizontally after the other line is bent horizontally.

The same applies to the exemplary embodiment according to FIG. 2.

those of the composite line shown there are a flow line 20 and two overflow return lines 21 and 22 directly into the common insulation 23 embedded and adhesively connected to this, on the other hand bypassing the solid outer sleeve 24 having a circular cross-section is.

While the double line according to J? Ig. 1 in pre-made sections transported and these are used hanging on the top part ä attached to the facts 13 are carried out oer transport of the triple line according to i? ig. 2 in the usual way when rolled up.

The laying is done in such a way that the position of the return lines is above the supply line is guaranteed, like the exemplary embodiments shown in the figures show, the invention can be used with advantage in district heating pipes with flow and return lines in any number.

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Claims (5)

Claims 1. District heating multiple line with at least one each Flow and return lines, which are within a thermal insulation, which in turn is surrounded by a mechanically strong outer shell, characterized by the ate Return line (2) runs above the flow line (1). 2nd line according to claim 1, daturct marked that between the Flow and return lines (1, 2) in the thermal insulation (5) an intermediate layer (10) is made of heat-radiation-preventing material, such as aluminum foil, 3. Line according to claim 1 or 2, characterized in that the flow and / or the return line (1, 2) from an individual casing (3, 4) which prevents heat radiation Material, such as aluminum foil, is enclosed. 4. Line according to one of claims 1 to 3, d a d u r c h g e k e n n z e i c h -net that the thermal insulation (5) on the flow line (1) The opposite side of the return line (2) is stronger than that of the return line (2) facing away from the flow line (1). 5. Line according to one of claims 1 to 4, characterized in that that casing tubes (1 ', 2') for the flow and rick run lines (1, 2) are elongated Have cross-sections whose largest dimensions run parallel to each other. 6. Line according to one of claims 1 to 5, d a d u r c h g e k e N n n z e i c h -n e t that the outer sleeve (6) consists of a weldable plastic and box-like from a channel-shaped lower part (7) and a lid-like that Lower part (7) overlapping upper part (d) is formed, which is welded to one another are. 70 line according to one of claims 1 to 6, characterized in that aass all side outlets (12) from the flow and return lines (1, 2) on the respective line (1, 2) aD run free of spelling.