The invention relates to a method for optimizing a district heating network (1) comprising outgoing supply pipes and incoming return pipes, wherein a heat carrying fluid is circulated to be utilized for residential and commercial heating requirements. For storing excess thermal energy available at the district heating network, the method involves the steps of implementing more than one ground-based borehole thermal energy storage (4) as distributed heat storages at different locations of or along the district heating network (1). Each heat storage (4) is adapted to receive thermal energy from various forms of heat sources, which heat sources may be found at different locations of or along the district heating network (1) such, that the heat sources and the heat storages forming nodes in the district heating network (1). Excess thermal energy available to one node of the district heating network (1) is used to charge a borehole thermal energy storage (4) at one or several nodes, and thermal energy available from the borehole thermal energy storages (4) is at disposal to be used to heat the heat carrying fluid circulated in the supply pipes of the district heating network.
The present invention comprises an arrangement in a borehole. Such an arrangement comprises two tubes, an outer tube and an inner tube being arranged within each other having essentially parallel longitudinal axes. Said outer and inner tubes are connected to incoming and outgoing tubes respectively. The cross sectional area of the inner tube is less than half of the cross sectional area of the outer tube, whereby the outer tube and/or the incoming and outgoing tubes arranged in the borehole are insulated until they reach below a freezing depth of the surrounding media. Said the inner tube is also arranged to end before reaching the bottom end of the outer tube when inserted in the borehole, thus forming a fluid passage between the both tubes at the bottom end of said borehole.
F24T 10/17 - Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground using tube assemblies suitable for insertion into boreholes in the ground, e.g. geothermal probes using tubes closed at one end, i.e. return-type tubes
F28D 7/12 - Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically the surrounding tube being closed at one end, i.e. return type
The present invention comprises an arrangement in a borehole (13). Such an arrangement comprises two tubes, an outer tube (11) and an inner tube (12) being arranged within each other having essentially parallel longitudinal axes. Said outer and inner tubes are connected to incoming and out-going tubes (15, 16) respectively. The cross sectional area of the inner tube (12) is less than half of the cross sectional area of the outer tube (11), whereby the outer tube (11) and/or the incoming and outgoing tubes (15, 16) arranged in the borehole (13) are insulated until they reach below a freezing depth of the surrounding media. Said the inner tube (12) is also arranged to end before reaching the bottom end of the outer tube (11) when inserted in the borehole (13), thus forming a fluid passage (14) between the both tubes at the bottom end of said borehole.
F24T 10/17 - Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground using tube assemblies suitable for insertion into boreholes in the ground, e.g. geothermal probes using tubes closed at one end, i.e. return-type tubes
4.
ARRANGEMENT AND METHOD FOR OPTIMAL ENERGY STORAGE AND RECAPTURING OF THERMAL WELLS
The present invention relates to an arrangement and method for optimal energy storage and recapturing of thermal wells. Such an arrangement consists of an underground centre storage (2, 12) and bore wells (3) surrounding it in a substantially concentric and circular manner, there being two or more of such circles (4). The centre storage and bore wells are arranged to be in flow communication with each other by means of a pipe line (6) and with one or more heat sources (9) leading thermal energy to the system, the circles being provided with valves (8) to lead fluid transfer fluid to one circle of part thereof at a time.
F24T 10/13 - Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground using tube assemblies suitable for insertion into boreholes in the ground, e.g. geothermal probes
F28D 20/00 - Heat storage plants or apparatus in generalRegenerative heat-exchange apparatus not covered by groups or
F24T 10/30 - Geothermal collectors using underground reservoirs for accumulating working fluids or intermediate fluids
A solar collector arrangement (1) comprises at least two solar collectors (2), each solar collector (2) comprising at least one collector element (3) with at least one flow channel for receiving heat transfer medium to be heated in the solar collector (2). The at least two solar collectors (2) are arranged in parallel connection relative to each other and the heat transfer medium to be heated in the solar collectors (2) and the heat transfer medium heated in the solar collectors (2) are arranged to flow into the solar collectors (2) and out of the solar collectors (2) in turns one or some solar collectors (2) of the solar collector arrangement (1) at a time.
F24S 50/00 - Arrangements for controlling solar heat collectors
F24S 50/40 - Arrangements for controlling solar heat collectors responsive to temperature
F24S 10/00 - Solar heat collectors using working fluids
F24S 80/30 - Arrangements for connecting the fluid circuits of solar heat collectors with each other or with other components, e.g. pipe connectionsFluid distributing means, e.g. headers
A collector element for collecting solar energy. The collector element is made of metal and comprises at least one elongated central ridge comprising at least one internal flow channel for a heat transfer medium, first and second elongated side ridges at opposite sides of the at least one central ridge and an elongated depression between each two adjacent ridges. At least one side ridge comprises at least one fastening element by means of which at least one substantially solar radiation permeable covering element is to be fastened to the collector element for covering at least the at least one elongated central ridge of the collector element.
E04D 13/18 - Roof covering aspects of energy collecting devices, e.g. including solar panels
F24S 20/67 - Solar heat collectors integrated in fixed constructions, e.g. in buildings in the form of roof constructions
F24S 20/25 - Solar heat collectors for receiving concentrated solar energy, e.g. receivers for solar power plants using direct solar radiation in combination with concentrated radiation
The invention relates to a collector element for collecting solar energy, a solar collector for collecting solar energy, a building comprising a roof and a method for transferring heat from a collector element collecting solar radiation. The collector element (1) is made of metal and comprises at least one elongated central ridge (2) comprising at least one internal flow channel (9) for a heat transfer medium, first and second elongated side ridges (3, 5) at opposite sides of the at least one central ridge (2) and an elongated depression (4,6) between each two adjacent ridges (2,3; 2,5). At least one side ridge (3) comprises at least one fastening groove by means of which at least one substantially solar radiation permeable covering element (11) is to be fastened to the collector element (1 ) for covering at least the at least one elongated central ridge (2) of the collector element (1). The collector element (2) may comprise a layer of photovoltaic material at least at a portion of an upper surface of the collector element to be arranged to the face of the sun.
F24S 10/70 - Solar heat collectors using working fluids the working fluids being conveyed through tubular absorbing conduits
F24S 25/65 - Fixation means, e.g. fasteners, specially adapted for supporting solar heat collector modules for coupling adjacent supporting elements, e.g. for connecting profiles together
F24S 10/40 - Solar heat collectors using working fluids in absorbing elements surrounded by transparent enclosures, e.g. evacuated solar heat collectors
F24S 25/40 - Arrangement of stationary mountings or supports for solar heat collector modules using plate-like mounting elements, e.g. profiled or corrugated platesPlate-like module frames
E04C 2/52 - Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure with special adaptations for auxiliary purposes, e.g. serving for locating conduits
E04D 3/35 - Roofing slabs or stiff sheets comprising two or more layers, e.g. for insulation
8.
Solar collector, collector element, building roof, building, and solar energy recovery system
The invention relates to a solar collector (1) comprising a collector element plane comprising a set of parallel metallic collector elements (2) for collecting solar energy. The collector element plane, on its side to be arranged to face the sun, comprises a set of parallel, elongated ridges (R, r) formed by the metallic collector elements (2), and elongated depressions (v) between the ridges (R, r), and that at least some of the ridges (R, r) comprise therein a channel (3) for a heat transfer medium. The invention also relates to a collector element. The invention further relates to a building roof, a building, and a solar energy recovery system comprising said solar collector (1).
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