摘要:
A method for determining an air flow in a vehicle air conditioning system, the system comprising: at least one inlet; a plurality of outlets; at least one air duct for guiding air from the inlet to the outlets, each air duct being characterized by a predetermined flow resistance coefficient; at least one flap being characterized by a flow resistance based on a degree of opening of the flap; and a fan for creating an air flow from the inlet to an outlet; the method comprising the steps of; determining a total equivalent flow resistance between a predetermined location in the system and the interior of the vehicle; wherein flow resistances are treated as resistances in an electric circuit, and a total equivalent flow resistance is determined. Treating a pressure drop as equivalent with a voltage drop, the air flow can be determined, as the pressure is equal to the resistance times the flow squared.
摘要:
A method of and apparatus for assessing the condition of a fluid conduit. The method comprises providing a measurement apparatus comprising a measurement region in fluid communication with the fluid conduit. The measurement apparatus is operable to measure at least one of pressure and flowrate in the measurement region. A pressure surge is effected or generated to propagate in the fluid conduit, and at least one of a pressure response or a flowrate response from the fluid conduit is measured. From a pressure data set and a flowrate data set, a data set representative of the cross sectional area along the fluid conduit is determined. This enables average or over all area profiles along long fluid pipelines to be deduced.
摘要:
L'invention concerne un procédé de commande mis en oeuvre dans une unité de traitement (UC) employée dans la commande d'un système multipompes, ledit système multipompes comprenant un conduit d'entrée (IN) destiné à recevoir un fluide, deux pompes (P 1 , P 2 ) connectées en parallèle audit conduit d'entrée et un conduit de sortie relié aux sorties des deux pompes (P 1 , P 2 ), au moins l'une des deux pompes étant commandée par un variateur de vitesse (VSD), chaque pompe (P 1 , P 2 ) étant définie par une première courbe caractéristique (HQ curve_n ) débit-hauteur manométrique à vitesse maximale et par une deuxième courbe caractéristique (PQ curve_n ) débit-puissance reçue. Le procédé de commande permet de déterminer le débit total (Q total ) du système multipompes sans employer de capteurs tels que des débitmètres.
摘要:
Durch die kombinierte Durchfluss- und Thermographiemessung eines Bauteils kann das Bauteil zu einhundert Prozent in einer Vorrichtung bezüglich seines Kühlluftverbrauchs und der gewünschten Querschnitte von Kühlluftöffnungen überprüft werden.
摘要:
Technique of suppressing performance variations for each flow sensor is provided. In a flow sensor FS1 of the present invention, a part of a semiconductor chip CHP1 is configured to be covered with resin (MR) in a state in which a flow sensing unit (FDU) formed on a semiconductor chip CHP1 is exposed. Since an upper surface SUR (MR) of the resin (MR) is higher than an upper surface SUR(CHP) of the semiconductor chip (CHP1) by sealing the resin (MR) on a part of the upper surface SUR(CHP) of the semiconductor chip CHP1 in a direction parallel to an air flow direction, the air flow around the flow sensing unit (FDU) can be stabilized. Further, interface peeling between the semiconductor chip (CHP1) and the resin (MR) can be prevented by an increase of contact area between the semiconductor chip (CHP1) and the resin (MR).
摘要:
A differential pressure sensor (105) for determining a differential pressure value is provided. The differential pressure sensor (105) includes a selector valve (110) configured to receive a first pressure at a first location and a second pressure at a second location that is spaced-apart from the first location, a single-sided pressure sensor (120) coupled to the selector valve (110) and receiving either the first pressure or the second pressure, and a processing system (130) coupled to the single-sided pressure sensor (120) and configured to receive one or more first single-sided pressure measurements from the single-sided pressure sensor (120), subsequently receive one or more second single-sided pressure measurements from the single-sided pressure sensor (120), and generate the differential pressure value from the one or more first single-sided pressure measurements and the one or more second single-sided pressure measurements.
摘要:
A flow sensor includes a fluid chamber configured to receive a fluid. A diaphragm assembly is configured to be displaced whenever the fluid within the fluid chamber is displaced. A transducer assembly is configured to monitor the displacement of the diaphragm assembly and generate a signal based, at least in part, upon the quantity of fluid displaced within the fluid chamber.
摘要:
A method for determining the amount of oxygen introduced into a process tank of a biological treatment works, in particular a small sewage works (1), during a ventilation process is disclosed, wherein the volume of air pumped into the air line (14) with a running compressor (17) is determined. During the ventilation process (B2) the pressure in the air line (14) is measured and, taking into consideration the pumping pressure dependent power curve of the pump, the pumped volume is determined. Taking into account the oxygen content contained therein, the amount of oxygen introduced into the process tank (6) is determined. The current filling level in the process tank is determined absolutely, preferably by means of the pressure sensor arranged in the air line.
摘要:
An apparatus for determining an initial flow rate (Q) of a liquid in a conduit (10), comprising: (a) a means (20, 22, 70, 90) for introducing a change of a known volume of liquid over a known time to the initial flow rate (Q); (b) a sensor (50, 50', 50", 72, 92) located downstream from the point for where a known liquid volume over a known time is introduced, the sensor (50, 50', 50", 72, 92) measuring a flow corresponding parameter; and (c) a controller (100) connected to the sensor (50, 50', 50", 72, 92), the controller (100) being configured to determine the initial flow rate (Q) in response to the relative change (Cd) in the flow corresponding parameter downstream from where the flow is changed and the introduced known liquid volume over a known time, corresponding to Q = Q i C d , where Cd = ΔQd/Qd is the relative change in the measured flow corresponding parameter.