DE2633009A1 - Central heating system with radiators and underfloor heaters - has recuperative cooler at inlet to each underfloor heater - Google Patents

Abstract

Central-heating system in which radiators and underfloor heaters are supplied from a common source of hot water. The temp. needed for the radiators is too high for the underfloor heaters. The problem is solved by fitting each underfloor heater with a heat exchanger formed from two coaxial pipes (1, 2). The cool water returnin from the underfloor heater is sent through the space between the pipes, to moderate the temp. of the too hot water discharging from the inner pipe. Spiral filaments (4) are pref. wound round the inner pipe, to induce turbulence in the annular space. The excess space in the inner pipe is pref. taken up with a cylindrical core (3), round which also filaments (5) are spirally wound.

Description

Title: Temperature Reducing Element

(for liquid heating media) Field of application: The invention relates to a temperature reducing element for hot water heating systems to which partially Kussboden heating elements are to be connected.

Purpose: The temperature reducing element is for hot water heating systems thought in which, in addition to the radiators, also in one or more rooms Underfloor heating is to be installed. As is well known, the heating medium temperature Do not exceed a certain value in the floor (400C ', .. 50 ° 4 in order to excessive temperature stresses and the associated cracks in the screed and Avoid floor covering and, on the other hand, floor surface temperatures that are too high to avoid.

State of the art: So far, this has only been possible successfully using a Mixing control station, consisting of a mixing valve, a pump and the necessary Group shut-off valves and thermometers can be achieved. Furthermore, this was additional a corresponding pipe system between the mixing station and the floor heating registers necessary (e.g. book "The Radiation Heating", author A. Kollmar, W. Liese, Verlag R. Oldenbourg, Munich, born 1957, pages 38 to 42).

Criticism of the state of the art: This effort is necessary when installing only a few underfloor heating surfaces within a building are usually far too expensive.

The solution that is also often used, namely the floor registers Connecting it to a radiator return is extremely unsatisfactory because the return temperature fluctuates depending on the required radiator output (depending on the Weather and thus the flow temperature), i.e. sometimes hot and sometimes cool be can; furthermore, the floor register is also switched off when the heater is switched off.

Task: The invention is based on the task of adding an element create, by means of which at any point in a hot water heating system the flow temperature for a floor heating register without loss and without auxiliary energy as well as can be reduced without special effort and space requirement.

Solution: The object is achieved according to the invention in that the The temperature reducing element consists of two tubes, one inside the other, that form a Form double jacket pipe.

The inner tube forms the heat exchanger surface through which a Part of the heat from the high temperature supply water to the same return water at a lower temperature. * Continued on page 5 Further details: In order to achieve an intensive and as uniform as possible heat exchange, the tube cross-sections chosen so that between the inner and the outer tube is relatively small gap. Helical wires are inserted into this pipe gap drawn in, causing the heating water to be forced to the inner pipe to flow around. This avoids temperature stratification in the pipe gap. In addition, the turbulence created in the flow facilitates the heat transfer elevated.

In the inner tube there is a core piece, also in cross section chosen so that between the inner tube and core piece a relatively low Gap is.

Helical wires are drawn into this gap, too have the function already described above.

The size of the temperature reducing element, such as length and cross-section, is directed according to the service to be provided.

By connecting an automatically, without auxiliary energy commercially available temperature control valve (e.g. return temperature limiter) into the Low temperature line, the low temperature can be on a selected, constant Value can be maintained even if the inlet temperature or the flow pressure change.

Achievable Advantages: The advantages of the invention are that - With the help of this temperature reducing element, floor heating register on any Place of a hot water central heating system connected to the usual high flow temperature and can be operated at the desired low temperature.

- Due to its small size, this device can be used in any common Can accommodate pipe wall slot, but structurally no special precautions meet are.

- This device has no moving parts, so it is completely maintenance-free is.

- this device does not require any auxiliary energy.

- this device due to its simple construction and character no additional pipelines and electrical connections are required, i.e. in the system costs is significantly cheaper than the known mixing control stations.

- this device is mass-produced in various output sizes can be.

Description of the embodiment: An embodiment of the invention is shown in the drawings and is described in more detail below. Show it Figure I - the nested tubes (1 + 2). The tube 2 forms the heat exchanger surface - The core (3) - not shown as a section - the helical ones Wires (4 + 5) in the outer and inner pipe gap - the inlet connection (6) from the boiler or radiator pipe network. The flow water to the underfloor heating register flows through this nozzle - the drain connection (7) to the underfloor heating register (low temperature) - the return water inlet connection (8) of underfloor heating registers. This return water cools over the pipe surface 2 the inner flow water - the return water drainage connection (9) to the boiler or

Radiator pipe network Fig. II - schematically the installation of the temperature reducing element in a hot water central heating system in a vertical and horizontal arrangement with the following essential parts: 10 boiler 11 temperature reducing element Fig. I 12 Temperature control valve 13 Floor heating register 14 Radiator * Continuation from sheet 2 to solution: The mode of action is as follows: The heating water high temperature enters the inner tube (2) through the inlet nozzle (6), flows through this and exits again through the outlet nozzle (7). It then flows through you downstream automatic temperature controller and then the floor heating register. There the heating water gives off part of its heat to the floor and flows, now cooler, return to the temperature reducing element.

There it enters the free, annular cross-section of the outer tube (1). When it flows through to the return drain port (9) it washes around the surface of the inner tube (2). Due to the temperature difference of the two water flows - higher in the inner pipe, lower in the outer pipe the flow water flowing through the inner pipe (2) absorbs part of its heat the return water flowing through the outer pipe (1) and becomes cooler as a result. The return water flows accordingly heated back to the boiler.

The automatic temperature controller connected downstream of the drain connection (7) measures the water temperature flowing through and controls the heating water flow that the return water from the underfloor heating register comes back sufficiently cool, in order to achieve the required cooling effect on the supply water in the temperature reducing element from practicing.

The size of the heat exchanger surface = inner tube (2) depends according to the floor heating surface output to be connected. The temperature reducing elements can be prefabricated for different performance areas, they can if required but can also be manufactured accordingly on a case-by-case basis.

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Claims (4)

Claims 1. Temperature reducing element (Fig.I), characterized by two nested pipes (1 + 2), which form a double-jacket pipe, of which the inner tube (2) forms the heat exchanger surface through which a part the heat from the high-temperature heating water flowing to a heating register the same return heating water at a lower temperature is delivered. 2. temperature reducing element (Fig.I) according to claim 1, characterized in that that in the tube gap between the inner tube (2) and the outer tube (1) helical Wires (4) are attached, which flow evenly around the inner tube (2) and cause turbulence in the flow, which increases heat transfer produce. 3. temperature reducing element (Fig.I) according to claim 1 + 2, characterized characterized in that a core piece (3) is attached in the inner tube (2), which causes the water flow flowing through the inner tube (2) to be forced, to flow tightly along the inner pipe wall of the inner pipe (2). 4. temperature reducing element (Fig.I) according to claim 1, 2 + 3, characterized characterized in that in the pipe gap between the inner pipe (2) and the core piece (3) helical wires (5) are attached, which flow evenly around the Cause core piece (3) and cause turbulence in the flow, which one generate increased heat transfer.