Abstract:
The invention relates to a flow measurement system for determining a flow of a medium, comprising a Coriolis flow sensor, a thermal flow sensor and a processing unit connected thereto. According to the invention, the processing unit is arranged for determining, based on the output signals of both the Coriolis flow sensor and the thermal sensor, at least one of the thermal conductivity and the specific heat capacity of a medium in the flow measurement system. The invention further relates to a method of determining at least one of the thermal conductivity and the specific heat capacity of a medium.
Abstract:
A method for determining fluid parameters, such as a heat capacity c p p, a calorific value Hp, a methane number MN, and/or a Wobbe index WI, of an unknown fluid (g). An unknown flow (55) of the fluid (g) is set in a sensor device (10), the sensor device (10) comprising a thermal flow sensor (1) and a pressure sensor device (15) for measuring at least one temperature value T 1 , T 2 , a further parameter, and differential pressure value Δρ over a flow restrictor (14). Using these measurement parameters T 1 , T 2 , Δp and calibration data, the calorific value Hp, and/or the Wobbe index Wl, or parameters indicative thereof, of an unknown fluid (g) are calculated. The invention also relates to such a sensor device (10) and to a computer program product for carrying out such a method.
Abstract:
The present invention relates to methods and apparatus for making in situ thermal property determinations utilizing a heat source employed in wellbore stabilization procedures, well drilling, or well perforating, for example. In particular, using a heat source, such as a laser driller, to enable formation temperature measurements. Based on these measurements, thermal properties of the formation may be inferred.
Abstract:
A modular materials characterization apparatus includes a sensor array (10) disposed on a substrate (16), with a standardized array and contact pad (14) format; electronic test and measurement apparatus (54) for sending electrical signals to and receiving electrical signals from the sensor array (10); an apparatus for making electrical contact (50) to the sensors in the standardized array format; an apparatus for routing signals (129) between one or more selected sensors and the electronic test and measurement apparatus and a computer (52) with a computer program recorded therein for controlling the operation of the apparatus. The sensor array (10) is preferably arranged in a standardized format used in combinatorial chemistry applications for rapid deposition of sample materials on the sensor array. An interconnection apparatus (40) and sensor array (10) and contact pad (32) allow measurement of many different material properties by using substrates carrying different sensor types.
Abstract:
Apparatus and method for measuring the heat capacity of a sample (S) where a series of measurements are taken in succession. The apparatus comprises a sample holder (12), a temperature sensor (24), a sample heater (28) for providing a heat pulse upon receiving an electrical output from a first power supply (DC current source in the figure), an adiabatic heat shield (50) in which the sample holder (12) is positioned, and a heat shield electrical heater (51) which receives electrical power from a second power supply (DC current source in the figure). This electrical power being adjusted by a control device (computer in the figure), if necessary, from one measurement to the next in response to a sample temperature-versus-time change determined before and after a previous heat pulse so as to provide a subsequent sample temperature-versus-time change that is substantially linear before and after the subsequent heat pulse. Optionally, the sample (S) may be subjected to DC magnetic fields.
Abstract:
A method for sorting mined material in a sorting apparatus is disclosed. The method includes supplying particles of a mined material onto a conveyor belt (5), transporting the particles on the conveyor belt past a detection assembly (9, 13) and assessing the particles, and separating the particles based on the assessment into an accepts stream and a rejects stream at a discharge end of the belt using a separator assembly (29). The method also includes controlling the arrangement of particles so that there is an ordered arrangement of particles on the belt to optimise the throughput of particles through the sorting apparatus.
Abstract:
The invention relates to a device (1) for determining the heat capacity of an object (2), comprising: a first heat conduction member (11) via which the object (2) can be coupled in a heat conducting manner to the device (1). According to the invention said first heat conduction member (11) is formed by a first Peltier (10) element, which is connected to an inductive component (30), so that a heat current from an object (2) coupled to said first heat conduction member (11) through said first Peltier element (10) varying with time induces a voltage drop across said inductive component (30) that opposes the changes in said heat current. Further, the invention relates to a method for determining the heat capacity of an object.
Abstract:
The invention relates to a device and methods for the characterisation of a flowing substance, liquid or gas. Particular embodiments of the invention relates to the use of the device for the identification of a flowing substance, for controlling the flow of a fuel or combustion gas to deliver a controlled heat of combustion and for measuring the heat capacity of a gas. Further embodiments of the invention relate to a flow control device for controlling the flow rate of a flowing substance and a method for the combustion of a fuel or combustion gas. The device for the characterisation of a flowing substance comprises: a transport duct on which is mounted a heating or a cooling element; a temperature difference sensor comprising a first temperature measurement cell downstream of the heating or cooling element and means to determine a temperature difference in the flowing substance upstream and downstream of the heating or cooling element; flow control means comprising flow measurement means for measuring a mass flow characteristic and flow correction means for correcting for measured mass flow variations; and evaluation means for evaluating a characterising feature of the flowing substance comprising a function relating temperature differences measured on one or more calibration substances to one or more characterising features of the flowing substance. The device is relatively simple and cheap and gives a quick but accurate and reliable characterisation of a flowing substance, gas or liquid, that can be used in a flow control device to control the flow rate of unknown substances.
Abstract:
Die Erfindung betrifft ein Verfahren zur Bestimmung der Gasbeschaffenheit von Brenngasen, bei dem mittels Korrelationsverfahren aus meßtechnisch an dem Brenngas ermittelten Meßgrößen Gaskenngrößen ermittelt werden, die Aussagen über die Gasbeschaffenheit des Brenngases erlauben, wobei als Meßgrößen die Wärmeleitfähigkeit λ, die Wärmekapazität c p und der Kohlendioxidanteil XC0 2 des jeweiligen Brenngasses gemessen und daraus unter Einbeziehung bekannter Stoffgrößen für typische Brenngase die Gaskenngrößen berechnet werden, wie z.B. Brennwert, Dichte, Wobbeindex, Methanzahl etc...