DE8026871U1 - DEVICE FOR HEAT EXCHANGE - Google Patents

Description

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The invention relates to a device for exchanging heat primarily between a gas and a liquid, the inside of the gas leading in its axial length limited annulus one or two helically coiled Has finned tubes. The heat exchangers are mainly used to dissipate overheating or condensation of refrigerants in refrigeration systems or Heat pumps used.

In a known design, finned tubes are used as a tube bundle construction, whereby the medium flowing inside - mostly water - is led in parallel through the pipes and the refrigerant flows outside and is cooled by the water. These exchangers have a large number of soldered joints and cannot counterflow, the particular advantages of using superheated refrigerant vapor offers, realize.

These disadvantages are partially avoided by another type of so-called Coaxial systems in which two tubes, one outer tube with one inside finned tube guided axially to the outer tube, bent into spirals or spirals. In this way, heat exchangers can be implemented according to the countercurrent principle. Disadvantages of this design are that each meter of inner finned tube 1 m outer pipe is necessary. On the other hand, the coiling of the tubes means that the exchangers take up a considerable amount of space. It is also difficult Support outer pipe and inner pipe from one another in order to avoid rattling through the pipes during operation.

The invention is therefore based on the object of a device for heat exchange between a gas - primarily a refrigerant gas - and a liquid to create in which the construction volume is kept to a minimum, a countercurrent is implemented and, for health reasons, no soldering points occur between refrigerant and liquid (service water) (see DVGW publication of 4.10.79).

According to the invention, the solution to this problem is characterized in that | that rolled finned tubes depending on their dimensions to mini 1 painting space can be wound as spirals without the tubes being noticeably flattened (where the winding f! is approx. 2 χ finned tube outer 0). |

Experiments have shown that with rolled finned tubes I

f Realize the smallest angle diameter of approx. 2 χ finned tube outer diameter | permit. As a result, maximum surfaces are accommodated in a minimum of space (structural volume) without impairing the flow conditions on the inside of the pipe. In the embodiment according to FIG. 1, in particular, almost the entire space within the exchanger is filled by the finned tube helix.

To improve the internal heat transfer coefficients, the tubes can through the ribbing process is carried out with internal corrugation or spiral webs will. The coils 1 - in single-pipe or double-pipe design, with and without returning a connecting pipe - are pushed into a housing 2, the free flow cross-section for the flowing gas inside, half of the coil and between the outer diameter of the coil and the housing wall the respective service is coordinated. The pipe ends 4 of the coils 1 are soldered into the base caps 3. The housing 2 contains two connecting pipes 5 for the gas inlet and gas outlet, whereby these pipes should be attached at the beginning and end of the housing offset by 180 °. This creates an i The exchanger can be used horizontally and vertically. The gas inlet must take place at the connection pipe at the top in order to avoid condensation. to be able to discharge the refrigerant at the lower nozzle. The water connection is to be carried out in such a way that the water is directed against the gas flow.

Details can be found in the following drawings: 4

P Fig. 1: shows a helix 1 in which both water connections 4 on one | Side of the heat exchanger are soldered into the base plate. The | Finned tube is bent with a straight piece of pipe and wound back over this, so that the straight pipe section are as a displacer in the helix arrangement.

Fig. 2: shows a heat exchanger 1 with a coiled finned tube in a single-tube design, in which the water inlet or outlet 4 is arranged opposite and allows pure counterflow to the gas will.

Fig. 3: shows a finned tube that is first bent in a U-shape and then was wound as a double helix. Both connection pipes are on one side; there is no pure countercurrent here.

Fig. 4: shows a double helix in which two pipes are parallel to each other are wound, with the water inlets and outlets (4a and 4b) opposite are arranged and thus a pure countercurrent to the | Gas is made possible.

Claims (6)

ι- · 4 · - Protection claims: 1.) Device for heat exchange mainly between a gas and a liquid, which is a helically coiled within an annular space that guides the gas and is limited in its axial length Has finned tube, characterized in that rolled finned tubes depending on their dimensions with minimal Helix diameters of approx. 2 χ finned tube outer 0 are wound without impairing the flow conditions on the inside of the pipe in the form that one part of the finned tube is wrapped around the elongated other end ', the elongated finned tube as a displacement tube fills the free inner cross-section of the helix, or the finned tube is twisted free of displacement tubes. 2.) Device according to claim 1, characterized in that the finned tubes are corrugated on the inside. 3.) Device according to claim 1, characterized in that the Have finned tubes on the inside spiral webs. 4.) Device according to claim 1-3, characterized in that a coiled Finned tube in single-tube design with a spiral diameter of approx. 2 χ finned tube outer diameter so that the water inlet or outlet is arranged opposite one another. 5.) Device according to claim 1-3, characterized in that a finned tube with a helix diameter of approx. 2 χ finned tube outer 0 initially is bent in a U-shape and then wound as two common helixes will. Both connections are on one side. 6.) Device according to claim 1-3, characterized in that two finned tubes with a helix diameter of approx. 2 χ finned tube outer 0 parallel are wound to each other, with the water inlets and outlets opposite each other are arranged and thus enables a pure counterflow to the gas will.