DE2801791A1 - Heat storage pipeline with liq. storage medium - has helically wound pipelines enveloping each other for uniform heat circulation - Google Patents

Abstract

The low loss storage system for thermal energy ensures also low loss drawing of this stored energy. A liquid storage medium circulates between the energy source heat storage and heat drawing point. Heat absorption and emission is uniform over the whole circumference of the individual pipelines. The pipelines are wound so that they form shell like assemblies around each other. The individual pipe systems are connected to each other within functional units. These pipelines are wound in such a helical pattern with such a pitch that one half of the pipeline in one direction is wound over the circumference of a second pipeline system. The other half is wound in opposite direction pref. in the pipeline interstitial spaces.

Description

The main patent (patent application P 27 00 822.6) relates to a method for low-loss storage in a heat storage unit and for the low-loss extraction of the stored thermal energy from this heat storage unit using a flow medium suitable as a heat transfer medium, preferably liquids, which use the energy source and to store the thermal energy in circulation the heat accumulator, and the heat accumulator and the consumer flow through the heat accumulator and the consumer to remove the stored heat energy, so that the heat energy absorbed by the flow medium from the energy source is transferred to the heat storage mass of the heat accumulator, this from the flow medium from its center in layers, preferably in a spiral , is traversed to the outside in the direction of the outer circumference, and that the heat accumulator is traversed by the flow medium in the opposite direction to remove stored thermal energy.

According to this method, the heat accumulator is heated from the inside to the outside during the storage process, and heat energy is extracted from the heat accumulator from the outside to the inside during the removal process.

It is stated in the main patent that for this purpose the flow medium heated by the energy source is introduced into the core of the heat accumulator via a pipe bale arranged in the heat accumulator and with constant heat transfer to the heat accumulator mass through the pipeline system to the outer circumference of the heat accumulator and after the outlet is returned to the energy source for rewarming.

The removal takes place in the opposite direction. The flow medium is taken from the core of the heat accumulator, fed to the consumer and the cooled flow medium is fed back to the outer circumference of the heat accumulator and fed to the accumulator core via the pipe bale with slow heating.

As suggested in the main patent, the pipe ball is formed from individual pipe layers, of which the next pipe layer surrounds the previous one at a certain distance, and surrounds a common center like a shell.

In each of these pipeline layers, the pipeline is wound spirally in one direction over the respective circumference, so that the pipeline inlet and outlet are located at two opposite points of each pipeline layer.

The flow rate of the flow medium must be selected to be relatively low so that the largest possible amount of heat can be absorbed by the flow medium in the energy source (solar collector) while it is being stored, and the flow medium can absorb as much heat as possible in the less warm edge zones of the heat accumulator while it is being removed, so that little or no heat needs to be extracted from the core for as long as possible.

This low flow rate of the flow medium has the disadvantage that the flow medium on the inlet side in the individual pipeline layers already emits or absorbs the heat on the first half of the circumference, and the adjoining half of the circumference remains almost unaffected, which results in undesirable heat losses.

The invention has therefore set itself the task of avoiding these heat losses, a more uniform distribution of the heat absorption or heat output by the flow medium over the entire circumference of the individual pipe to achieve line layers. This object is achieved according to the invention in that shell-like enveloping pipe layers are wound to guide the heat transfer medium, that the individual pipe layers are connected to one another in terms of flow within the functional units, and that the pipe of each pipe layer is spirally wound with a pitch such that one half of the Pipeline is wound in one direction over the circumference of the pipeline layer and the other half in the opposite direction, preferably in the interstices of the pipeline.

The circumference of each pipeline layer is now completely traversed twice, in opposite directions. However, because the pipe spiral is now twice as steep, the pipe coil flows through twice as fast over its entire circumference in one direction of flow, which results in a more even distribution of heat absorption or extraction.

So that the previously stored or absorbed by the flow medium amount of heat is not stored or released again in the opposite direction of flow, it is proposed in a further embodiment of the invention that the pipelines of each pipeline layer to each other, and the individual pipeline layers. are arranged at a certain distance from each other.

The invention is explained with reference to the illustrated embodiment.

In the figure, for the sake of clearer representation, only one pipe layer 1 of the heat accumulator is shown. With 2 and 3, the two inlets and outlets of the pipeline layer 1 are designated, which are to be thought of as being connected to the pipeline layers adjoining inward and outward.

The pipeline 4 is wound spirally over the circumference of the pipeline layer 1 in one direction with a spacing 5 such that the pipeline 4 can still be inserted in the opposite wound direction with a sufficient gap 6 to the windings determining the spacing 5.

7 with the turning point of winding of the pipeline 4 of the pipeline layer 1 is designated.

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Claims (2)

1) Device for the low-loss storage of thermal energy in a heat storage device and for the low-loss extraction of the stored thermal energy from this heat storage device using a flow medium suitable as a heat transfer medium, preferably liquids, which are used to store the thermal energy in circulation, the energy source and the heat storage device, and to remove the stored thermal energy in circulation flow through the heat storage and the consumer, that for releasing and storing the heat energy absorbed by the flow medium from the energy source to the heat storage mass of the heat storage, this from the flow medium from its center in layers, preferably spirally, outwards towards the outer circumference is traversed, and that the heat accumulator is traversed by the flow medium in the opposite direction to remove stored thermal energy, according to patent (patent application P 27 00 822.6), characterized in that d ate to carry the heat transfer medium, shell-like enveloping pipe layers (1) are wound, so that the individual pipe layers (1) flow within the functional units with are connected to each other, and that the pipeline (4) of each pipeline layer (1) is spirally wound with such a pitch that one half of the pipeline (4) in one direction over the circumference of the pipeline layer (1) and the other half in is wound in the opposite direction, preferably in the pipeline spaces (5). 2) Device according to claim 1, characterized in that the pipes (4) of each pipe layer (1) to one another, and the individual pipe layers (1) are arranged at a certain distance (6) from one another.