Abstract: A heat exchanger and method for producing such a heat exchanger which during operation in a flow direction is flown through by a medium to be cooled and by two different cooling media. A power plant has a generator cooled by means of a generator cooling gas and a heat exchanger cooling the generator cooling gas.

Abstract: A regulation system for a compressor comprises a fiber-optic lattice sensor which makes it possible to determine a flow temperature of a fluid to be compressed by means of the compressor. Another aspect of the invention relates to a use of a fiber-optic Bragg lattice sensor as a temperature sensor in a regulation system.

Abstract: A regulation system for a compressor comprises a fibre-optic lattice sensor which makes it possible to determine a flow temperature of a fluid to be compressed by means of the compressor. Another aspect of the invention relates to a use of a fibre-optic Bragg lattice sensor as a temperature sensor in a regulation system.

Abstract: The invention relates to a method and device for representing a process flow. According to the invention, an optimal process flow is represented by means of an optimal point and the actual values of the variables of the processes are represented as points which are respectively arranged at a distance from the optimal point. The distances are determined by means of a good functional.

Abstract: A diagnosis method is for detecting ageing symptoms in a steam turbine. The efficiency and the steam flow rate of an aged steam turbine is compared to the efficiency and the steam flow rate of a relatively new steam turbine. The efficiency and the steam flow rate are calculated using readings at several operating points on the steam turbine. The time history of the efficiency and steam flow rates applied in contrast to parameters such as the peripheral. Mach number, pressure figure and adjustment of the inlet valve provide information on the extent of ageing of the steam turbine.

Abstract: A diagnosis method is for detecting ageing symptoms in a steam turbine. The efficiency and the steam flow rate of an aged steam turbine is compared to the efficiency and the steam flow rate of a relatively new steam turbine. The efficiency and the steam flow rate are calculated using readings at several operating points on the steam turbine. The time history of the efficiency and steam flow rates applied in contrast to parameters such as the peripheral Mach number, pressure figure and adjustment of the inlet valve provide information on the extent of ageing of the steam turbine.

Abstract: The flow of steam into a steam-collecting space of a steam turbine is controlled with a steam-inlet valve. The novel steam-inlet valve has an especially high control performance and losses of steam are kept especially low. The steam-inlet valve has a rotary cylinder that forms a shut-off member. The rotary cylinder is placed in a housing, and a steam inlet can be connected to a steam outlet via a passage provided in the peripheral surface of the rotary cylinder.

Abstract: A method and a device for diagnosing and predicting the operational performance of a turbine plant use a plant model determined from plant-specific characteristics to determine at least one further operating parameter, in order to establish a deviation of a current operating state from an ideal state and in order to predict a reaction of the turbine plant to changing boundary conditions, given the stipulation of an operating parameter, during operation of such a turbine plant. The device includes a computer module which accesses a model memory for the plant model, in order to calculate individual operating parameters with the aid of the plant model.

Abstract: A process and a device for imaging the operational condition of a turbine during a starting process include imaging a reference course being ascertained from turbine-specific characteristics and from operation-relevant parameters. As the reference course, a particular characteristic starting curve derived from the turbine-specific values is determined, which is ascertained by the operation-relevant parameters from a number of stored characteristic starting curves. A course over time of a turbine rpm is imaged in addition to the reference course.

Abstract: A method for monitoring the operating condition of a steam turbine, to which an adjustable inlet steam quantity can be supplied and from which a variable, partially expanded steam quantity can be extracted, includes initially ascertaining a relative inlet steam quantity for an adjustable inlet steam quantity as a percentage value, and ascertaining a relative turbine power from the relative inlet steam quantity as a percentage value; and determining an applicable operating point from the relative inlet steam quantity and the relative turbine power, and subsequently displaying the applicable operating point inside a performance graph for various extraction steam quantities.