DE3209207A1 - Absorber for absorption heat pump system - Google Patents

Abstract

In an absorber of an absorption heat pump system, a weak solution of refrigerant is enriched with refrigerant and the heat of absorption is supplied to a heat transfer medium. In order to improve the mixing of the solution with the refrigerant and the heat transfer to the heat transfer medium, the solvent and the refrigerant flow through an inner tube space of a twin-shell tube in which a spiral is preferably fitted as the deflection body. As a result, a centrifugal flow component impinges on an inner tube which heats the heat transfer medium. <IMAGE>

Description

STIEBEL ELTRON GmbH & Co. KG Holzminden / Weser

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3.3.1982 file

Absorber for an absorption heat pump system

The invention relates to an absorber, in particular for an absorption heat pump system, in which low-refrigerant Solution enriched with refrigerant and heat of absorption is supplied to a heat transfer medium.

Such an absorber is described in DE-OS 30 04 586. In this case, the absorber also forms the main heat exchanger. In the proposal according to DE-OS 30 Ok 586, heat sinks are arranged one above the other in several floors, through which the low-refrigerant solution flows in a cascade-like manner. The low-refrigerant solution absorbs refrigerant vapor and thus becomes a refrigerant-rich solution. The heat transfer medium of the useful circle flows through the floors of the floors. Not only the heat of the poor solution, but also the heat of absorption is transferred to the heat transfer medium. The absorber described in DE-OS JO Ok 586 is expensive to build due to its storey structure.

Absorbers are also in the refrigeration manual, ¥. Niebergall, Springer-Verlag, 1959.

With known coaxial double tube absorbers, the heat of absorption of the two-component mixture R22 / E181 can only discharge limited.

In DE-AS 12 71 584 an electric water heater is described. This is on a pipe jacket a spiral wound tubular heating element soldered on. There is an auger in the pipe jacket arranged. The water to be heated should be swirled by the water guiding screw. The pipe screw creates a mixture of two media not reached.

The object of the invention is to propose an absorber of the type mentioned at the outset in which the solvent and mix the refrigerant as much as possible, thereby ensuring effective heat transfer to the heat transfer medium takes place.

According to the invention, the above object is achieved in that the absorber has at least one double-walled tube that the thermal carrier medium through the outer space of the double-walled tube and through the inner tube space of the double-jacket tube, the low-refrigerant solution and the refrigerant vapor flows and that baffles are arranged in the inner tube space, the low-refrigerant Solution and the refrigerant vapor a centrifugal

Imprint flow component. The low-refrigerant solution and the refrigerant vapor are released through the baffle given an additional flow direction. This results in a favorable mixing of the low-refrigerant Solution and the refrigerant vapor take place, whereby the absorption of the refrigerant vapor by the low-refrigerant solution is improved. The additional direction of flow is outwards onto the inner jacket of the double jacket pipe directed, whereby the heat transfer to the heat transfer medium flowing through the outer space is improved.

In a preferred embodiment of the invention, the flow cross section of the inner tube space is dimensioned so that the Can draw refrigerant vapor over the low-refrigerant solution and thus a surface contact that promotes mixing entry.

In a preferred embodiment of the invention, the deflecting bodies are formed by a helix. This shapes the low-refrigerant solution and the refrigerant vapor on the centrifugal flow component.

Further advantageous embodiments of the invention emerge from the following description of a Embodiment. In the drawing show:

FIG. 1 schematically shows a perspective view of a double-jacket tube of an absorber and

FIG. 2 shows a section of the double-jacket tube along the line H-II according to FIG. 1, compared to FIG. 1 enlarged. ,

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An absorber has at least one double-jacket tube 1. The jacketed pipe or pipes 1 are arranged horizontally, vertically or at an incline in the absorber. The double-jacket pipe 1 is formed by an outer pipe 2 and an inner pipe 3. In the inner tube 3 an ¥ end k is arranged. The outer space 5 of the double-jacket tube 1, which lies between the outer tube and the inner tube 3, is flowed through by a transfer medium in the direction of the arrow according to FIG. Liquid solvent L and vaporous refrigerant K flow through the inner tube space 6 in the direction of the arrow L + K according to FIG. 1. The endel 4 consists of a helically bent sheet metal. The ¥ endel k is designed so that a flow cross section is formed in the inner tube 3, into which the refrigerant K and the solvent L can flow evenly. The flow cross-section is dimensioned in such a way that the refrigerant vapor K can pull over the low-refrigerant solution L. The flow cross-section is therefore not completely filled with liquid solvent.

The functioning of the device described is about the following:

Solvent L pressed through the end 4 through the end k assumes a flow component that is centrifugal to the pipe axis. The solvent L is thus pressed against the inner tube 3 on the one hand. On the other hand, it mixes with the refrigerant vapor K and absorbs it. This is particularly effective

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Mixing when the jacketed pipe 1 is about is oriented horizontally. The heat of absorption, which is enriched with refrigerant, is transferred through the helix 4 developing refrigerant pressed against the inner tube 3. This improves the heat transfer to the the outer space 5 flowing through the heat transfer medium W.

In the device described, a film of solvent is thus formed on the inside of the inner tube 3 with a high absorption heat content, which is transferred to the inner tube 3 and the heat transfer medium W. heats up. This is on the one hand by the centrifugal rotational movement of the solvent L and the with it at the same time connected good mixing with the refrigerant achieved.

In the embodiment described, the solvent and refrigerant flow concurrently. In another embodiment of the invention, solvents and refrigerants can the inner tube 3 are supplied i- ^m countercurrent.

In the exemplary embodiment according to FIG. 1, the solvent L and the refrigerant K each flow in countercurrent to the Heat transfer medium W. It is also possible to lead this in direct current to them.

In the exemplary embodiment, a helix 4 is provided in the inner tube space 6. Instead of the helix 4 can also other deflection bodies can be provided, which allow the refrigerant vapor to be mixed with the low-refrigerant solution

favor and the mixture a centrifugal, directed towards the heat exchanger surface with the heat transfer medium Give flow component.

The absorber proves to be particularly effective when R22 / E181 is used as the solvent / refrigerant will ·

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Claims (2)

3.3.1982 Patent y protection claims 1 .! Absorber, in particular for an absorption heat pump system, in which a low-refrigerant solution is enriched with refrigerant and absorption heat is supplied to a heat transfer medium, characterized in that the absorber has at least one double-walled tube (i) that is passed through the outer space (5) of the double-walled tube (1 ) the heat transfer medium (w) and through the inner tube space (6) of the double-jacket tube (1) the low-refrigerant solution (l) and refrigerant vapor (κ) flows and that deflecting bodies (k) are arranged in the inner tube space (6) which carry the low-refrigerant solution ( l) and impose a centrifugal flow component on the refrigerant vapor (κ). 2. Absorber according to claim 1, characterized in that that the flow cross-section of the inner tube space (6) is dimensioned so that the refrigerant vapor (κ) over the Low-refrigerant solution (l) draws. 3 absorber according to claim 1 or 2, characterized in that that the deflecting bodies are formed by a helix (4). ht absorber according to one of the preceding claims, characterized in that the inner tube space (6) is aligned horizontally or at an angle to the horizontal.