Abstract: The invention relates to a processing system comprising a processing unit (1, 60, 100) that can be operated between an upper (To) and a lower (Tu) temperature. A first heat accumulator (3, 61) and a second heat accumulator (4, 62) are operationally interconnected by means of a line arrangement (L) for a heat-transporting medium, said processing unit (1, 60, 100) being arranged in a first section (I) of said line arrangement (L) between the first (3, 61) and the second heat accumulator (4, 62).

Abstract: The invention relates to a method for producing a concrete workpiece (1, 60), wherein fresh concrete is poured into a negative (35, 80) of the workpiece (1, 60), and the concrete at least partly hardens in the negative and is then removed. The invention is characterized in that a positive (5, 71) is produced from me concrete workpiece (1, 60) to be produced, the positive is arranged in a casting formwork (20, 70), and negative fresh concrete is then poured onto the positive. The negative fresh concrete is removed after being at least partly hardened (35, 80), and the concrete body produced in this manner is used as a negative (35, 80) in order to produce the workpiece (1, 60) therein using the fresh concrete poured into the negative (35, 80).

Abstract: The disclosure relates to a method for producing a dimensionally stable concrete work-piece characterised in that to produce the concrete work-piece a fully-sealed dimensionally stable form is filled with fresh concrete in a predetermined geometry, during the subsequent and undisrupted hydration a predetermined temperature distribution of the walls of the form surrounding the hydrated concrete is carried out and the concrete workpiece is shaped at a compressive strength of more than 10 MPa.

Abstract: The method according to the invention for producing a prestressed concrete workpiece is characterized in that the prestress is created by a heat treatment, wherein the concrete and the reinforcement therefor are selected in such a way that, when cooling the concrete workpiece from an elevated temperature, the heat expansion coefficient of the concrete is less than that of the reinforcement, and in that, during cooling, the concrete and the reinforcement adhere sufficiently strongly to one another if, during cooling, the concrete is hydrated at least to such an extent in order to be able to expand the reinforcement on account of the different heat expansion coefficients, and in that the concrete, together with the reinforcement, is brought to the elevated temperature in such a way that and is hydrated during cooling at least to such an extent that it is prestressed by the reinforcement after cooling.

Abstract: The invention relates to a compressed air energy storage system comprising a pressure accumulator (2) for gas to be stored under pressure, and a heat accumulator (27) for storing the compression heat that has accumulated during charging of the pressure accumulator (2), wherein the heat accumulator (27) is arranged ready for use in an overpressure zone (31). Said arrangement enables a structurally simple heat accumulator to be provided, since said heat accumulator is not loaded by the pressure of the gas passing therethrough.

Abstract: The invention relates to a process system (1, 60, 100, 130, 160, 180, 190) comprising heat stores (3,4,30,61,61a-61d,62,62a-62d,110,163-165,181-183, 195-198), which are designed to store heat between an upper (To) and a lower temperature (Tu) and to discharge the same again, and comprising a conduit arrangement (L) for the transport of heat-transporting medium to the heat stores (3,4,30,61,61a-61d,62,62a-62d,110,163-165,181-183, 195-198) and away from the latter again, wherein a plurality of operable process units (2,63,63a-63d,161-162, 184-185,191-193) are provided between the upper (To) and the lower temperature (T(u) and are each arranged such that the process units are capable of operation between two heat stores (3,4,30,61,61a-61d,62,62a-62d,110,163-165,181-183, 195-198), through the conduit arrangement (L). This results in a reduced outlay for the production of the process system.

Abstract: The invention relates to a processing system comprising a processing unit (1, 60, 100) that can be operated between an upper (To) and a lower (Tu) temperature. A first heat accumulator (3, 61) and a second heat accumulator (4, 62) are operationally interconnected by means of a line arrangement (L) for a heat-transporting medium, said processing unit (1, 60, 100) being arranged in a first section (I) of said line arrangement (L) between the first (3, 61) and the second heat accumulator (4, 62).

Abstract: The invention relates to a method for producing a dimensionally stable concrete workpiece characterised in that to produce the concrete workpiece a fully-sealed dimensionally stable form (20) is filled with fresh concrete in a predetermined geometry, during the subsequent and undisrupted hydratation a predetermined temperature distribution of the walls (21, 22) of the form (20) surrounding the hydrated concrete is carried out and the concrete workpiece is shaped at a compressive strength of more than 10 MPa. The maximum size of the fresh concrete has a diameter of less than 20% of the smallest measurement of the shape.

Abstract: The method according to the invention for producing a prestressed concrete workpiece is characterized in that the prestress is created by a heat treatment, wherein the concrete and the reinforcement therefor are selected in such a way that, when cooling the concrete workpiece from an elevated temperature, the heat expansion coefficient of the concrete is less than that of the reinforcement, and in that, during cooling, the concrete and the reinforcement adhere sufficiently strongly to one another if, during cooling, the concrete is hydrated at least to such an extent in order to be able to expand the reinforcement on account of the different heat expansion coefficients, and in that the concrete, together with the reinforcement, is brought to the elevated temperature in such a way that and is hydrated during cooling at least to such an extent that it is prestressed by the reinforcement after cooling.

Abstract: The invention relates to an elongated absorber arrangement for a trough collector, which is subjected to concentrated radiation over its length during operation, and which has means for transporting heat-transporting fluid through the absorber arrangement. The absorber arrangement has at least one fluid-free absorber space for concentrated radiation, which has a thermal opening leading into its interior and walls for absorption of the heat incident into it.

Abstract: The invention relates to a trough collector with a primary concentrator, which concentrates solar radiation into a focal line region, with an arrangement for secondary concentration of the solar rays reflected by the primary concentrator, which arrangement concentrates the solar rays further into focal point regions. The arrangement for secondary concentration has a plurality of rows of secondary concentrators which have identical orientation in a row, but have differing orientation from row to row. Further, means are provided in order to keep one of the rows in the operating position and the other rows in a rest position. Thus, a range of the skew angle can be assigned to each of the rows and in the event of the change thereof, another row is brought into operating position.

Abstract: The invention relates to a compressed air energy storage system comprising a pressure accumulator (2) for gas to be stored under pressure, and a heat accumulator (27) for storing the compression heat that has accumulated during charging of the pressure accumulator (2), wherein the heat accumulator (27) is arranged ready for use in an overpressure zone (31). Said arrangement enables a structurally simple heat accumulator to be provided, since said heat accumulator is not loaded by the pressure of the gas passing therethrough.

Abstract: The invention relates to a trough collector comprising a number of secondary concentrators, by which the solar radiation concentrated by the concentrator of the trough collector in a first direction transverse to the length thereof is concentrated in a second direction running along the trough collector, wherein the secondary concentrators each have a first, front reflecting wall and a second, rear reflecting wall which concentrate the radiation in the second direction, and wherein the secondary concentrators are arranged such as to be synchronously pivotable with one another, preferably about a respective pivot axis fixed with respect to the primary concentrator, such that as the position of the sun changes, the secondary concentrators can always be oriented in accordance with the incident radiation.

Abstract: The invention comprises a method and a device for measuring a reflector for radiation during the operation thereof, in which to determine the current reflection properties of the reflector in a number of at least one measurement points provided in the path of the radiation reflected by the reflector, the pattern of predetermined characteristics of the currently reflected radiation is measured and compared with a predetermined reference pattern, wherein the current geometrical properties of the reflector are inferred from the comparison and in the event of undesired geometrical properties, appropriate operational parameters of the reflector are modified. This method is preferably applied in trough collectors for solar power plants, in order to measure flexible concentrators arranged in a pressure cell, during their operation.