Heat exchange – Geographical
Patent
1990-03-08
1994-06-21
Rivell, John
Heat exchange
Geographical
62260, F28D 2100
Patent
active
053221150
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an installation for utilizing the earth's heat in accordance with the preamble of claim 1.
Installations of the above-described type are known, for example, from Swiss Patent 650,069. In the installation described in this patent, the return line leads into the upper portion of the borehole underneath the earth's surface. The water then flows through the porous filling to the bottom of the borehole, the water is heated as a result and is again conducted to the heat pump through the flow lines by means of the pump. This has the disadvantage that the return water is conducted in an uncontrolled manner in the return region, so that, on the one hand, short circuit loads may occur which make a sufficient heating of the return water difficult On the other hand, there is the danger that the porous filling is clogged, so that the resistance to flow is increased and there is the danger that the return water flows off into the ground. It is then necessary to pump water by means of the pump from the surrounding ground which, however, poses problems because of the resistance to flow in the ground Moreover, silt material is picked up from the ground which, in turn, results in clogging of the intake region at the bottom of the borehole and causes the pump to become ineffective.
It is the object of the invention to construct an installation of the above-described type in such a way that the described disadvantages are avoided.
The above object is met in accordance with the invention by the characterizing features of claim 1.
The arrangement of the return pipe with several transverse plugs distributed over the length of the return pipe and the passages arranged on both sides of the transverse plugs ensure a defined return flow of the return water. The transverse plugs force the return water radially outwardly through the passages into the porous filling and, thus, cause the water to come into contact with the wall of the borehole and to be heated. After passing the transverse plug, the return water can again flow through the passages into the return pipe and can flow to the next transverse plug where it is again forced to flow out. This guidance of the return water defines the return flow to the bottom of the borehole, on the one hand, and ensures, on the other hand, that the return water is always in contact with the filling and the borehole wall and, thus, can be heated. However, the distances are so short that the return water can again collect in the next section of the return pipe. The fact that the return water flows out radially also ensures that the flow paths are kept free along the porous filling. The defined guidance of the return water further prevents water losses to the surrounding area. This results in an excellent guidance of the return water to the bottom of the borehole and to the pump, so that an optimum heating of the return water and a sufficient amount of return water through the pump are ensured. The result is an installation having a high efficiency and a low susceptibility to trouble.
Advantageous developments of the installation are described in claims 2 to 7.
A development of the installation in accordance with claim 2 is particularly advantageous because the longitudinal slots make it possible to distribute the water guidance over a greater area and the small width still makes possible a strong jet which is capable of penetrating the porous filling up to the borehole wall and simultaneously flushing out any silt material from the porous filling. It is a further advantage if the installation is constructed in accordance with claim 3, so that a uniform distribution of the water guidance over the entire length of the return pipe is ensured. By offsetting the passages of adjacent rows, flushing through the porous filling and flushing free the porous fillings are reinforced.
Various materials may serve as filling, such as, slag, special components and the like. However, the feature according to claim 4 is preferred.
It is essentially conceivable to arrange only one return pip
REFERENCES:
patent: 3679264 (1972-07-01), Van Huisen
patent: 3805885 (1974-04-01), Van Huisen
patent: 4010731 (1977-03-01), Harrison
patent: 4019577 (1977-04-01), Fitch et al.
patent: 4060988 (1977-12-01), Arnold
patent: 4392531 (1983-07-01), Ippolito
patent: 4452303 (1984-06-01), Bontje et al.
Leo L. R.
Rivell John
LandOfFree
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