Abstract: Computer implemented method for determining boundary thermal resistance data (Rbl) of a boundary layer (15), comprising the following steps: obtaining first temperature data (T1) from a first temperature sensor (13), which is arranged at a first pipe section (S1); obtaining second temperature data (T2) from a second temperature sensor (14), which is arranged at a second pipe section (S2); wherein the first temperature sensor (13) and the second temperature sensor (14) are non-invasive temperature sensors; providing process condition data (P); determining boundary thermal resistance data (Rbl) of a boundary layer (15) of the fluid (11) next to an inner surface (16) of the wall of the pipe (12) based on the process condition data (P) and/or based on the first temperature data (T1) and/or the second temperature data (T2).

Abstract: A computer implemented method for determining boundary thermal resistance data of a boundary layer includes obtaining first temperature data from a first temperature sensor, which is arranged at a first pipe section; obtaining second temperature data from a second temperature sensor, which is arranged at a second pipe section, wherein the first temperature sensor is a non-invasive temperature sensor and the second temperature sensor is an invasive temperature sensor; providing process condition data; determining boundary thermal resistance data of a boundary layer of the fluid next to an inner wall of the pipe based on the process condition data.

Abstract: A method for determining a temperature of a fluid flowing through a pipe section includes: determining a temperature of the pipe section; obtaining a reference temperature at a distance from a surface of the pipe section; determining a heat transfer behaviour, in particular a thermal resistance, of a boundary layer of the fluid on an inner wall of the pipe section based on at least one material property and/or at least one value of a state variable of the fluid; and determining the temperature of the fluid based on the heat transfer behaviour of the boundary layer, a heat transfer behavior, in particular a thermal resistance, of the pipe section, the temperature of the pipe section, and the reference temperature.

Abstract: A system for non-invasive determining of a fluid temperature of a fluid in a pipe, comprising a surface temperature sensor disposed at a pipe surface of the pipe; a reference temperature sensor disposed outside of the pipe; a data interface, configured for receiving nominal process parameters; a process parameter sensor, configured for determining at least one measured process parameter, wherein the at least one measured process parameter relates to measured parameters of a process that relates to the fluid in the pipe; and a process model, configured for determining a calculated fluid temperature of the fluid in the pipe by using the determined surface temperature, the determined reference temperature, the received nominal process parameters and the at least one measured process parameter.

Abstract: A method for validating an invasive temperature measurement system includes providing a first temperature data of the invasive temperature measurement system of a medium, the medium surrounded by a vessel wall enclosing the medium; providing a second temperature data of a non-invasive temperature measurement system, the non-invasive temperature measurement system thermally contacting an outside surface of the vessel wall enclosing the medium; determining a temperature of the medium based on the second temperature data medium properties and properties of the vessel wall; and comparing the first temperature data with the determined temperature of the medium to validate the invasive temperature measurement system.

Abstract: A temperature sensor assembly configured to be coupled thermally to a vessel wall for determining a temperature of a surface of the vessel wall is provided, the assembly includes: a first single-branched thermal conduction path, between the surface of the vessel wall and an environment of the temperature sensor assembly, comprising a temperature measurement sensor, configured to be thermally coupled to a first site of the surface of the vessel wall resulting in a first thermal resistance; and a second single-branched thermal conduction path, between a second site of the surface of the vessel wall and an environment of the temperature sensor assembly, comprising a reference temperature sensor, configured to be thermally coupled to the surface of the vessel wall resulting in a second thermal resistance.

Abstract: A temperature-measuring device for determining the temperature of a surface or a medium by utilizing the temperature of the surface enclosing the medium includes at least one measuring sensor and at least one reference sensor as well as a value processing device, which is connected to the measuring sensor via a first connection line and which is connected to the reference sensor via a second connection line, wherein of both connection lines at least the first connection line is partly realized as a mineral-insulated sheathed cable providing the measuring sensor, wherein both connection lines comprise a flexible cable connected to the value processing means.

Abstract: A temperature measuring device for determining a medium temperature by a temperature of a measuring point on a surface enclosing the medium includes: at least one measuring sensor; at least one reference sensor; and a measured value processing device which is connected via a cable to the at least one measuring sensor and via a cable to the at least one reference sensor. The at least one measuring sensor and the at least one reference sensor are arranged along a main thermal connection path between the surface enclosing the medium and surroundings. The at least one measuring sensor is arranged close to the measuring point. A thermal resistance between a relevant measuring sensor and the at least one reference sensor is smaller than a thermal resistance between a relevant reference sensor and the surroundings.

Abstract: A measurement system for determining a physical parameter of a pipe-fluid system includes a pair of confining elements configured to decrease surface vibration deformations at an outer surface of each end of the pipe-fluid system; wherein each confining element comprise a supporting frame configured to be detachably mounted on a pipe of the pipe-fluid system; and a fixation element configured to be detachably mounted for mechanically coupling the supporting frame with an outer surface of the pipe; an excitation system, configured to generate a mechanical vibration spectrum at a surface of the pipe-fluid system; and a vibration measurement device configured to be mechanically coupled to an outer surface of the pipe-fluid system, and configured to provide a mechanical vibration spectrum of the pipe-fluid system.

Abstract: A system and method for determining a physical parameter of a pipe-fluid system includes providing a mechanical vibration spectrum of the pipe-fluid system, which is generated by a mechanical excitation impacting an outer surface of the pipe-fluid system, providing characteristic data of a pipe of the pipe-fluid system, providing process-fluid data of the pipe-fluid system, determining a mechanical model vibration spectrum based on a provided theoretical model for the pipe-fluid system and the provided characteristic data of the pipe and the provided process-fluid data, and comparing the mechanical vibration spectrum and the model vibration spectrum for determining the physical parameter of the pipe-fluid system for determining the physical parameter of the pipe-fluid system.

Abstract: A method for determining a temperature of a fluid flowing through a pipe section includes: determining a temperature of the pipe section; obtaining a reference temperature at a distance from a surface of the pipe section; determining a heat transfer behaviour, in particular a thermal resistance, of a boundary layer of the fluid on an inner wall of the pipe section based on at least one material property and/or at least one value of a state variable of the fluid; and determining the temperature of the fluid based on the heat transfer behaviour of the boundary layer, a heat transfer behavior, in particular a thermal resistance, of the pipe section, the temperature of the pipe section, and the reference temperature.

Abstract: A temperature measuring device for determining a medium temperature by a temperature of a measuring point on a surface enclosing the medium includes: at least one measuring sensor; at least one reference sensor; and a measured value processing device which is connected via a cable to the at least one measuring sensor and via a cable to the at least one reference sensor. The at least one measuring sensor and the at least one reference sensor are arranged along a main thermal connection path between the surface enclosing the medium and surroundings. The at least one measuring sensor is arranged close to the measuring point. A thermal resistance between a relevant measuring sensor and the at least one reference sensor is smaller than a thermal resistance between a relevant reference sensor and the surroundings.

Abstract: A protective tube device can protect a temperature sensor against contact with a fluid, and has a distal end containing the temperature sensor and has an outer wall provided for contact with the fluid, and a proximal end which is connected to the temperature sensor by electric lines and is intended for arrangement outside the fluid, wherein, on the outer wall of the distal end, an elastic membrane closes off a resultantly defined pressure transmission fluid reservoir in a fluid-impermeable manner, the pressure transmission fluid reservoir being connected fluidically by a fluid channel running within the protective tube device to a pressure sensor arranged in the proximal end.

Abstract: A protective tube device can protect a temperature sensor against contact with a fluid, and has a distal end containing the temperature sensor and has an outer wall provided for contact with the fluid, and a proximal end which is connected to the temperature sensor by electric lines and is intended for arrangement outside the fluid, wherein, on the outer wall of the distal end, an elastic membrane closes off a resultantly defined pressure transmission fluid reservoir in a fluid-impermeable manner, the pressure transmission fluid reservoir being connected fluidically by a fluid channel running within the protective tube device to a pressure sensor arranged in the proximal end.