Abstract: The invention relates to a method for operating a linearly concentrating solar power plant (1), in which a heat transfer medium flows through a pipeline loop (47) having at least one receiver, the heat transfer medium having a flow velocity which is such that the flow in the pipeline loop (47) is turbulent, at least part of the heat transfer medium, upon exit from the pipeline loop (47), being extracted and recirculated into the pipeline loop (47). Furthermore, the invention relates to a linearly concentrating solar power plant with at least one pipeline loop (47) having at least one receiver in which a heat transfer medium flowing through the pipeline loop (47) is heated by irradiating solar energy, a mixing device (27) being comprised, in which at least part of the heat transfer medium flowing through the pipeline loop (47) is mixed with heat transfer medium to be delivered.

Abstract: At least two series-connected storage cells have hot liquid supplied to or removed from a first cell and cold liquid supplied to, or removed from, a final cell. The liquid temperature decreases from the first cell to the final cell. Individual cells are connected from the warmer cell lower region to the colder cell upper region. At least one cell is closed by a cover forming a gas space between the liquid and the cover. A gas line branches off from the gas space entering into the liquid of a colder cell or into the liquid in the connection of two adjacent cells. At least one of the adjacent cells has a lower temperature than that of the cell from the gas space of which the gas line branches off.

Abstract: A pipeline system in a linearly concentrating solar power station comprises at least one pipeline which is connected at one end to a converger and at a second end to a distributor. The converger and the distributor are arranged at a different geodetic height. When the converger lies on top pressurized gas can be fed into the converger and the distributor is connected to a drainage container. When the distributor lies on top pressurized gas can be fed into the distributor and the converger is connected to a drainage container. The drainage container is lower than the converter and the distributor.

Abstract: The invention relates to a solar power plant with a first heat transfer medium circuit and with a second heat transfer medium circuit, in which the first heat transfer medium circuit comprises a store (3) for hot heat transfer medium and a store (5) for cold heat transfer medium and also a pipeline system (6) connecting the stores (3, 5) for hot heat transfer medium and for cold heat transfer medium and leading through a solar array (7), and the second heat transfer medium circuit comprises a pipeline system (9) connecting the stores (3, 5) for hot heat transfer medium and for cold heat transfer medium and in which at least one heat exchanger (11) for the evaporation and superheating of water is accommodated, the at least one heat exchanger (11) having a region through which the heat transfer medium flows and a region through which water flows, said regions being separated by a heat-conducting wall, so that heat can be transmitted from the heat transfer medium to the water.

Abstract: The invention relates to a device for storing heat, comprising a heat storage medium which absorbs heat in order to store heat and releases heat in order to use the stored heat, and a container for holding the heat storage medium, the container being closed by a gastight cover, and the device comprising volume compensation means in order to compensate for a volume increase of the heat storage medium (3) due to a temperature rise and a volume decrease due to a temperature reduction.

Abstract: The invention relates to a device for heat transfer, comprising a low temperature heat exchanger (3) and a high temperature heat exchanger (5), the heat exchangers (3, 5) being connected to one another by means of a connecting line such that a heat transfer medium flows through the high temperature heat exchanger (5) and through the low temperature heat exchanger (3) in succession, at least one dwell time tank (19) being arranged in the connecting line.

Abstract: Method of maintaining or widening the long-term operating temperature range of a heat transfer medium and/or heat storage medium comprising a nitrate salt composition selected from the group consisting of alkali metal nitrate and alkaline earth metal nitrate and optionally alkali metal nitrite and alkaline earth metal nitrite, wherein the nitrate salt composition is brought into contact with an additive comprising the components nitric acid and/or nitrous acid and oxygen-comprising gas having an oxygen partial pressure which is equal to or greater than that in air and/or oxygen-generating compounds and optionally nitrogen oxides and/or compounds which generate further nitrogen oxide.

Abstract: The invention relates to a container for storing a liquid, which tends to decompose into gaseous decomposition components in the case of the conditions prevailing in the container (1) and in the case of which a chemical reaction equilibrium results between gaseous decomposition components and liquid, wherein a floating roof (29) is accommodated in the container (1) and the floating roof (29) comprises floats (33), using which the floating roof (29) floats on the liquid, and wherein the floating roof (29) is guided using a sliding seal (45) in the container (1). The invention furthermore relates to a device for storing heat, comprising a first container (57) for storing a colder liquid and a second container (59) for storing a hotter liquid and a use of the container and the device for storing heat.

Abstract: The invention relates to a pipeline system for a linearly concentrating solar power plant (1) with at least one receiver line (13), in which a heat transfer medium is heated by radiating solar energy, or with a central receiver and at least one emptying tank (21) and/or one store for the heat transfer medium, the heat transfer medium having a vapor pressure of less than 0.5 bar at the maximum operating temperature. Furthermore, a gas displacement system (31) is comprised, which connects gas spaces in the at least one emptying tank (21) and/or in the store for the heat transfer medium to one another and which has a central gas store (35) and/or a central gas connection (37) and a central exhaust gas outlet (39), through which gas can be discharged into the surroundings.

Abstract: The invention relates to a solar power plant with a first heat transfer medium circuit and with a second heat transfer medium circuit, in which the first heat transfer medium circuit comprises a store (3) for hot heat transfer medium and a store (5) for cold heat transfer medium and also a pipeline system (6) connecting the stores (3, 5) for hot heat transfer medium and for cold heat transfer medium and leading through a solar array (7), and the second heat transfer medium circuit comprises a pipeline system (9) connecting the stores (3, 5) for hot heat transfer medium and for cold heat transfer medium and in which at least one heat exchanger (11) for the evaporation and superheating of water is accommodated, the at least one heat exchanger (11) having a region through which the heat transfer medium flows and a region through which water flows, said regions being separated by a heat-conducting wall, so that heat can be transmitted from the heat transfer medium to the water.

Abstract: The invention relates to a device for heat transfer, comprising a low temperature heat exchanger (3) and a high temperature heat exchanger (5), the heat exchangers (3, 5) being connected to one another by means of a connecting line such that a heat transfer medium flows through the high temperature heat exchanger (5) and through the low temperature heat exchanger (3) in succession, at least one dwell time tank (19) being arranged in the connecting line.

Abstract: The invention relates to an apparatus for storing a liquid, comprising at least two series-connected storage cells (3), with hot liquid being able to be supplied to, or removed from, a first storage cell (3) via a first central line (35) and with cold liquid being able to be supplied to, or removed from, a final storage cell of the series-connected storage cells (3) via a second central line (33), and with the temperature of the liquid in the series-connected storage cells (3) decreasing in each case from the first storage cell (3) to the final storage cell (3), and the individual storage cells (3) being connected to one another in each case via a connection (5; 7) from the lower region (11) of the warmer storage cell (3) to the upper region (15) of the colder storage cell (3), and with at least one storage cell (3) being closed by a cover (27) and therefore a gas space (25) being formed between the liquid in the storage cell (3) and the cover (27), wherein a gas line (29) branches off from at least one gas s

Abstract: The invention relates to a method for operating a linearly concentrating solar power plant (1), in which a heat transfer medium flows through a pipeline loop (47) having at least one receiver, the heat transfer medium having a flow velocity which is such that the flow in the pipeline loop (47) is turbulent, at least part of the heat transfer medium, upon exit from the pipeline loop (47), being extracted and recirculated into the pipeline loop (47). Furthermore, the invention relates to a linearly concentrating solar power plant with at least one pipeline loop (47) having at least one receiver in which a heat transfer medium flowing through the pipeline loop (47) is heated by irradiating solar energy, a mixing device (27) being comprised, in which at least part of the heat transfer medium flowing through the pipeline loop (47) is mixed with heat transfer medium to be delivered.

Abstract: Described is a pipeline system for conveying a salt melt, comprising at least one pipeline (5) through which the salt melt flows, at least one inlet and at least one outlet, wherein the pipeline (5) through which the salt melt flows has at least one gradient inclined with respect to the horizontal and is respectively connected at the lowest positions via a drainage valve (25) to a drainage line (27) and at the highest positions to a venting valve (23). Also described is a method for draining the pipeline system.

Abstract: The invention relates to an apparatus for heating a pipeline system, comprising at least two pipelines (1), along which in each case one electrical resistance heating element extends, wherein a potential close to the ground potential is set at each electrical resistance heating element at at least one end (3, 5), and the electrical resistance heating element is connected to a terminal of a DC source or to in each case one phase (7) of an n-phase AC source (9) at a position remote from this end (3, 5), where, when using an n-phase AC source (9), n is an integer equal to or greater than 2.

Abstract: A nitrate salt composition comprising A) an alkali metal nitrate and optionally an alkali metal nitrite in a total amount in the range from 90 to 99.84% by weight and B)an alkali metal compound selected from the group B1) alkali metal oxide, B2) alkali metal carbonate, B3) alkali metal compound which decomposes into alkali metal oxide or alkali metal carbonate in the temperature range from 250° C. to 600° C., B4) alkali metal hydroxide MetOH, in which Met is lithium, sodium, potassium, rubidium, cesium, B5) alkali metal peroxide Met2O2, in which Met is lithium, sodium, potassium, rubidium, cesium, and B6) alkali metal superoxide MetO2, in which Met is sodium, potassium, rubidium, cesium, in a total amount in the range from 0.16 to 10% by weight, in each case based on the nitrate salt composition.

Abstract: The invention relates to a pipeline for carrying a molten salt, with a pipe wall that is stable with respect to the temperatures occurring. A heating conductor (21) is provided inside the pipeline (5) for heating, the heating conductor (21) preferably not lying against the inner wall of the pipeline (5).

Abstract: The invention relates to an apparatus for heating a pipeline system, comprising at least two pipelines (1), along which in each case one electrical resistance heating element extends, wherein a potential close to the ground potential is set at each electrical resistance heating element at at least one end (3, 5), and the electrical resistance heating element is connected to a terminal of a DC source or to in each case one phase (7) of an n-phase AC source (9) at a position remote from this end (3, 5), where, when using an n-phase AC source (9), n is an integer equal to or greater than 2.

Abstract: Method of maintaining or widening the long-term operating temperature range of a heat transfer medium and/or heat storage medium comprising a nitrate salt composition selected from the group consisting of alkali metal nitrate and alkaline earth metal nitrate and optionally alkali metal nitrite and alkaline earth metal nitrite, wherein the nitrate salt composition is brought into contact with an additive comprising the components nitric acid and/or nitrous acid and oxygen-comprising gas having an oxygen partial pressure which is equal to or greater than that in air and/or oxygen-generating compounds and optionally nitrogen oxides and/or compounds which generate further nitrogen oxide.

Abstract: The invention relates to a pipeline system, comprising at least one pipeline loop (9) which is connected at one end to a converger (7) and at a second end to a distributor (5), wherein the converger (7) and the distributor (5) are arranged above one another, and when the converger (7) lies on top pressurized gas can be fed into the converger and the distributor (5) is connected to a drainage container (21), and when the distributor (5) lies on top pressurized gas can be fed into the distributor (5) and the converger (7) is connected to a drainage container (21), the drainage container (21) lying lower than the converger (7) and the distributor (5).