Abstract:
For air distribution or extraction, fan speed is controlled using modeling to account for venturi air valves (28). A minimum pressure for each venturi air valve (28) is incorporated into the model. The pressure losses for various duct airpaths to terminal units (22) is calculated based, in part, on the minimum pressure of any venturi valve (28). The fan set point or operation is established based on the highest needed pressure in the various airpaths connected with the fan (18).
Abstract:
A subsea flow meter assembly (100) for measuring the flow of a medium is provided. The subsea flow meter assembly (100) has a pipe section (101) extending in an axial direction and providing a flow path for a medium. At least four measuring ports (11, 12, 13, 14) are provided at different locations in the pipe section (101). A first sensor assembly (20) is configured to measure at least a differential pressure between a first and a second measuring port (11, 12) and an absolute pressure at one of the first and second measuring ports (11, 12). A second sensor assembly (30) is configured to measure at least a differential pressure between a third and a fourth measuring port (13, 14), and an absolute pressure at one of the third and fourth measuring ports (13, 14). A first measuring unit (50) is mounted to the pipe section (101) and configured to take measurements of the differential pressure and the absolute pressure by means of the first sensor assembly (20). A second measuring unit (60) is mounted to the pipe section (101) and configured to take measurements of the differential pressure and the absolute pressure by means of the second sensor assembly (30). An evaluation unit of each measuring unit (50, 60) determines a flow rate of a flow of medium through the pipe section (101) based on the pressure measurements.
Abstract:
A flow meter (1) comprising a sampling tube (3) through which fluid may flow and a sensor arrangement (9, 25, 27, 39, 41, 43, 44, 45, 46, 47), wherein the sampling tube (3) comprises a first hollow section (51, 53) having a first internal cross-sectional area (A 1 ) and a second hollow section (55, 57) having a second internal cross-sectional area (A 2 ) being less than the first internal cross-sectional area (A 1 ); and the sensor arrangement (9, 25, 27, 39, 41, 43, 44, 45, 46, 47), is for measuring the difference between stagnation and static pressures (P 01 , P 02 , P 1 , P 2 ) within the second hollow section (55, 57).
Abstract:
The invention provides a balancing valve intended to adjust and lock the flow in central heating networks, in hot and cold utility water installations, in air conditioning and cooling installations. The valve (1) is provided with a body (2) that has two connector pipes, namely an inlet one (3) and an outlet one (4), closed with a cover (12), wherein a seat is housed (5) and closed with a head (6) mounted on a stem (7) where the stem (7) is seated in a gland (9) arranged in the cover (12). Outside the cover (12) there is a knob (10) connected with a bolt (1 1) to the stem (7). The valve (1) is provided with sealing elements (19) wherein the head (6) is connected to an adjusting ring (13). The body (2) and the cover (12) are made of plastics.
Abstract:
A turbulator adapted to be mounted to or inserted in an inlet portion of a flow meter for a ventilator is disclosed. The turbulator is adapted to create a turbulent gas flow in the inlet portion downstream of the turbulator upon passage of a gas flow therethrough. A flow meter for a ventilator is provided. The flow meter may comprise such turbulator. The turbulator may be arranged in the inlet portion of the flow meter. A membrane for a ventilator flow meter is provided, as well as a flow meter comprising the membrane. A flow meter comprising a turbulator and a membrane is disclosed.
Abstract:
A method for determining the flow rates of a multi-component mixture in a pipe including a gas phase and a liquid phase comprising an emulsion of oil and water, the emulsion being either of the water continuous type or the oil continuous type, the method comprising the following steps: a. the flow rates of the individual components of the multi-component mixture are measured, b. the Reynolds number of the multi -component mixture is measured, c. the emulsion type of the liquid phase of the multi-component mixture is determined, and d. based on the results from steps b and c, a more accurate flow-rate of the individual components of the multi-component mixture and a fluid property of at least one of the components of the multi-component mixture are calculated. An apparatus for performing the method is also disclosed.
Abstract:
A method for determining the flow rates of a multi-component mixture in a pipe including a gas phase and a liquid phase, the method comprising the following steps: a. the flow rates of the individual components of the multi-component mixture are measured, b. the Reynolds number of the multi-component mixture is measured separately from the flow rate measurements, and c. based on the result from step a and b, a more accurate flow-rate of the individual components of the multi-component mixture is calculated. An apparatus for performing the method is also disclosed.
Abstract:
A method for determining the flow rates of a fluid comprising a multi-component mixture comprising the following steps: a. The temperature and pressure of the multi-component mixture is determined b. the fractions of the multi-component mixture is determined based on at least two measured physical properties of the multi-components mixture and knowledge of the same physical property of the individual components of the multi-component mixture c. the velocity of the multi component mixture is determined d. based on the result from step a-c, the flow rate of the individual component of the fluid is determined characterized by a method for improving the accuracy of the determined flow rates where e. an electromagnetic measurement is performed f. a statistical parameter related to the electromagnetic measurement is calculated g. the said statistical parameter is compared to an empirical derived threshold value corresponding to the value of the statistical parameter when only one of the component of the multi component mixture is present h. the thickness of unwanted deposits on the pipe wall is determined i. the result from step a-d and step h is used to obtain an improved flow rate determination of the individual components of the said fluid An apparatus for performing the method is also disclosed.
Abstract:
A remote seal assembly (18, 20) for subsea applications is provided. The assembly (18, 20) includes an upper housing (34, 102) having a fluid coupling (110) for coupling the remote seal to a process fluid pressure measurement device. A lower housing (36, 104) is coupled to the upper housing (34, 102) and has an interface that is configured to mount to a pressure vessel (12). The lower housing (36, 104) also has a process fluid inlet (32). An isolation diaphragm (41, 154) is disposed between the upper and lower housings. At least one of the upper housing (34, 102), lower housing (36, 104) and isolation diaphragm (41, 154) are constructed from a material suitable for immersion in saltwater. In some embodiments, the lower housing (36, 104) has a shoulder (140) disposed about the process fluid inlet (32) and a plurality of self-energizing seals (40, 42) configured to couple the assembly to a venturi flow meter body (12). A subsea process fluid flow measurement system is also provided that includes a pressure transmitter and at least one subsea remote seal assembly.
Abstract:
A valve includes a body having upstream and downstream ports, both ports configured relative to a common axis, and includes a ball arranged to rotate relative to the common axis between open and closed positions to allow for fluid flow/non-fluid flow. The ball has a calibrated member having a calibrated orifice that has a flow coefficient, pressure taps located upstream and downstream of the calibrated orifice and in communication with the upstream and downstream ports respectively to measure upstream and downstream pressures when in the open position, the upstream and downstream pressure taps are angled relative to the common axis, so conditions of fluid flow are determined based on a measured pressure differential between upstream and downstream pressure taps relative to the flow coefficient of the calibrated orifice when in the open position.