93 results about "Discharge coefficient" patented technology

A dry sprinkler for a fire protection system. The preferred dry sprinkler has a metallic disc annulus positionable within a passageway to skew a central axis of a face of the metallic disc annulus with respect to a longitudinal axis of the dry sprinkler so that an expected minimum flow rate based on a rated discharge coefficient is provided. The dry sprinkler operates to provide an expected flow rate over a range of start pressures. The expected flow rate is based on a K-factor rating. The dry sprinkler provides an acceptable level of fluid flow rate from the expected flow rate based on the K-factor for a range of start pressures.

A method and system for predicting degradation of a battery. Modeling of a battery is made to be separated into an aging section and a current-carrying section. The modeling is established such that the amount of degradation of a capacity retention ratio is determined by the linear sum of stay at each temperature and each SOC. The separation into degradation components at each temperature and each SOC enables predicting degradation under various degradation environments. A model for a battery separated into an aging section and a current-carrying section and a calculation model of a root law are combined into an objective function, and a table of discharge coefficients a_h(T,S) and a table of current-carrying coefficients a_c(T,S) are generated using a solver, where T indicates the temperature and S indicates SOC. Once tables are generated, degradation of the battery can be predicted by calculation using the tables.

Multi-phase flow is estimated in a flow meter by measuring fluid pressure within the flow meter and using the measured pressure to calculate a density of the flow. A total flow rate through the flow meter is estimated based on the calculated density and a PVT analysis of the fluid. A corrected total mass flow rate is calculated using a liquid/gas slip correction technique. Fluid flow rates are further corrected with a discharge coefficient that varies with changes in the Reynolds number of the fluid. The gas and oil fractions can be determined from the corrected total mass flow rate and gas fraction.

A method for determining an actual gas flow rate as gas flows through a gas flow delivery system is provided. The method includes sending the gas through the gas flow delivery system into a gas conduit, wherein a section of the gas conduit is widened to form an orifice. The method also includes pressurizing the gas to create a choked flow condition within the orifice of the gas conduit. The method further includes measuring upstream pressure of the gas via a set of pressure sensors. The method yet also includes calculating the actual flow rate based on the upstream pressure of the orifice of the gas conduit.

The invention discloses a cascaded multi-ditch gate lockage discharge coefficient calibration method, and relates to the field of hydrodynamic parameter identification. The method comprises the steps of building a hydrodynamic simulating and forecasting model of a researching channel section; combining flow measured values and water level measured values of all gates in the researching channel section, and using a Kalman filtering assimilation algorithm to obtain a real-time analysis water level sequence; utilizing a Saint-Venant equation to deduce and obtain an analysis flow sequence of a ditch gamma according to the real-time analysis water level sequence of the gates of any ditch gamma in the researching channel section; deducing and obtaining a ditch gamma lockage discharge coefficient by utilizing the real-time analysis water level sequence of the gates of the ditch gamma and the analysis flow sequence of the ditch gamma. By means of the cascaded multi-ditch gate lockage discharge coefficient calibration method, the precision of the hydrodynamic simulating and forecasting model is sharply improved, and the accuracy of a forecasting value is improved.

The invention discloses a pneumatic type/mechanical type combined adjustment mach number 0-7 stage combined engine air inlet. The pneumatic type/mechanical type combined adjustment mach number 0-7 stage combined engine air inlet is mainly composed of a high-speed channel, a low-speed channel, a mechanical type variable geometry assembly and a pneumatic type shock wave adjusting assembly. Under the low-speed mode, the mechanical type variable geometry assembly is adopted for adjusting the throat area and the internal shrinkage ratio of the air inlet, and the low mach number starting performance and the high mach number compression performance of the air inlet are guaranteed; and under the high-speed mode, the pneumatic type shock wave adjusting assembly is used for adjusting the precursor shock wave position, the precursor shock wave sealing state is kept, and the discharge coefficient and the working performance of the air inlet are obviously improved within the wide mach number scope. According to the pneumatic type/mechanical type combined adjustment scheme, the compression amount and the precursor shock wave position of the air inlet can be continuously adjusted, it is guaranteed that the combined engine air inlet can effectively work within the wide mach number scope, and the good pneumatic performance is obtained.

An apparatus and method for measuring a mass flow rate of a multi-phase fluid flowing through a conduit. The apparatus includes a differential pressure element located in the conduit, wherein a first differential pressure measurement device is in communication with the multi-phase fluid between a first and second position across the differential pressure element and is able to measure a first fluid differential pressure. A second differential pressure measurement device is in communication with the multi-phase fluid between a third and fourth position across the differential pressure element and is able to measure a second fluid differential pressure. A processor is in communication with the first and second differential pressure measurement devices, and is able to calculate the Reynolds number and discharge coefficient using the first and second fluid differential pressures. The processor is also capable of calculating the mass flow rate by using the Reynolds number and discharge coefficient.

Provided an optimizing apparatus comprising a setting calculation unit (31) for calculating a control setting value for a hot rolling apparatus (100) to roll a rolling material (120), on the basis of the initial sizes, the initial temperature and the target temperature of the rolling material (120), a working energy calculation unit (32) for calculating a working energy necessary for the hot rolling apparatus (100) to roll the rolling material (120), on the basis of the control setting value, a during-manufacture carbon dioxide discharge calculating unit (33) for calculating the quantity of carbon dioxide to be discharged in the hot rolling apparatus (100), on the basis of the working energy and the carbon dioxide discharge coefficient, and an optimizing unit (35); for calculating the target temperature both as the temperature at or higher than the value necessary for retaining the quality of the rolling material (120) to be rolled, and as a temperature for minimizing at least one of the working energy or the carbon dioxide discharge.

The invention provides an estimation method for load of watershed agricultural non-point source pollutants into a lake. The estimation method includes acquiring data of a typical small watershed in a target watershed, creating a SWAT (soil and water assessment tool) of the typical small watershed, and acquiring LoadLr and LoadLo in the typical small watershed according to the SWAT; acquiring planting industry source, livestock and poultry industry source, aquaculture industry source and rural life source pollutant producing and discharging coefficients of each sub watershed of the typical small watershed, and combining basic information survey data to acquire LoadLs in the typical small watershed; acquiring target watershed agricultural non-point source pollutant ditch reduction factor Factorcr according to the LoadLs and the LoadLr; acquiring LengthLr according to water system data; acquiring target watershed agricultural non-point source pollutant riverway reduction factor Factorrr according to the LoadLr, the LoadLo and the LengthLr; acquiring target watershed agricultural non-point source nitrogen and phosphorus discharge load and the total length LengthBr of an inner riverway of the target watershed; acquiring the load of the target watershed agricultural non-point source pollutants into the lake according to the target watershed agricultural non-point source nitrogen and phosphorus discharge load, the Factorcr, the Factorrr and the LengthBr. By the method, the total load of the watershed agricultural non-point source pollutants into the lake can be acquired simply, accurately and rapidly, cost is low and large-scale comprehensive implementation is achieved.

A method and system to optimize values of a plurality of calibration discharge coefficients useable in a computer program operable to estimate mass air flow into an internal combustion engine having an air intake system comprising a throttle body and a plurality of sensors is presented. This includes collecting engine operation data points, including throttle position. Discharge coefficients are calculated, one for each engine operation data point. The discharge coefficients are partitioned based upon throttle position. Calibration discharge coefficients are calculated for each partitioned plurality of discharge coefficients. This includes circumscribing each calibration discharge coefficient based upon predetermined thresholds. This further includes monitoring and collecting input signals correlatable to airflow from the sensors during ongoing engine operation, preferably comprising throttle position, manifold pressure, intake air temperature, and, atmospheric pressure.

The invention discloses a method for predicting the flow rate of a large-scale low-head pump, which comprises the following steps: S1, calculating the pressure difference of the large-scale low-head pump through a test model; S2, calculating the pressure difference of large-scale low-head pump by cloud computing model; S3, calculating the pressure difference of the prototype large-scale low-head pump by cloud computing; S4, predicting discharge coefficient and truncation error of large-scale low-head pump; S5 predicts the field measured discharge of large-scale low-lift pumps. Cloud computingis introduced into the method of predicting the flow of large-scale low-head pumps, The numerical method of cloud computing solves the problem that the workstation can not compute because the model mesh size is used to generate huge mesh in the prototype numerical computation, and avoids the problem that the simulation results are not accurate due to the hardware problem which will increase the grid spacing. The invention can accurately predict the field measured flow rate of the large-scale low-lift pump, thereby determining the efficiency of the pump device and the unit energy consumption inthe pump station engineering, and scientifically and accurately completing the performance test of the pump device.

The invention discloses a simple detection method of a differential pressure device. The simple detection method includes the steps that EXCEL table cells are filled with the practical mass flow q<m> of the differential pressure device, the inner diameter D of an upstream pipe under the working condition, the diameter d of a throttle hole or a throat part of a primary device under the working condition, the differential pressure deltap and the diameter ratio beta from top to bottom; initial values are assigned to quantities required to be solved, and other quantities are obtained through measurement by a measurement device; the fluid density and the dynamic viscosity are determined according to characteristic parameters, namely the pressure and the temperature, of fluid of the differential pressure device; the discharge coefficient C1 and the discharge coefficient C2 are calculated; the difference value between the discharge coefficient C1 and the discharge coefficient C2 is calculated to serve as a target table cell, a target value is zero, when a certain value is needed to be solved, the table cell where the certain value is located is selected to be a variable table cell, a determining button is clicked, and a value in the variable table cell is the result of the quantity needing to be solved after calculation is completed. The simple detection method is rapid, simple and convenient to detect.

The invention relates to an evaluation and rectification method based on operation conditions of rod-pumped wells in a whole block. Relevant data in an A2 database are extracted; the load rate, the torque load rate and the power load rate are worked out, and ground efficiency, underground efficiency and system efficiency are worked out through indicator diagram data; and evaluation criterions of key nodes such as the rod-pumped well system efficiency, the motor load rate, the reduction gearbox load rate, the polished rod load rate, the pump discharge coefficient and the submergence depth, and corresponding rectification measures are established. The operation conditions of the rod-pumped wells in the whole block are considered, the wells to be rectified are screened out according to the evaluation criterions, the numbers of the wells are listed, the specific rectification measures are proposed for the wells according to specific problems, and the reliable technological method is provided for efficient and economical management of the wells in the whole block.

The invention discloses a battery online monitoring and maintenance system. The system comprises an isolated power source, a microprocessor, a communication chip, a pulse module, a charging module, ameasuring module and a discharging module. The isolated power source is used for eliminating voltage clutter. The pulse module, the charging module and the discharging module are respectively connected to the microprocessor and are controlled by the microprocessor. Output ends of the pulse module, the charging module and the discharging module are respectively connected to a battery. A first dataacquisition end of the measuring module is connected to the battery. A second data acquisition end of the measuring module is connected to the discharging module. An output end of the measuring moduleis connected to the microprocessor. The microprocessor acquires the voltage, temperature, internal resistance, dynamic load voltage, dynamic discharge current and a dynamic discharge coefficient or dynamic discharge power or dynamic discharge energy of the battery. The microprocessor is connected to the communication chip. The system can monitor many kinds of parameters on line, is installed in adistributed installation way and realizes the online voltage equalization and the online high-frequency pulse anti-vulcanization maintenance.

The invention relates to an air suction type safety valve, which comprises a main valve and a pilot valve. Primarily, a piston chamber is formed between a valve flap of the main valve and a valve cavity as well as a valve cover on the side of a valve body inlet; the valve flap is provided with a small hole for communicating a valve body inlet passage with the piston chamber; the valve body is provided with a through hole for communicating the inlet passage thereof with the piston chamber; a flow adjuster is arranged on the through hole; an opening height adjusting thread sleeve is arranged between the valve cover and the piston chamber; a seal chamber which is communicated with a transverse inlet of the pilot valve is formed between the opening height adjusting thread sleeve and the valvecover; the center of the opening height adjusting thread sleeve is provided with an inner hole for communicating the piston chamber with the seal chamber; and opening height of the valve flap and main valve flow coefficient are adjusted by adjusting relative position of the opening height adjusting thread sleeve and an upper valve rod; and closing speed of the main valve and the opening and closing pressure difference are controlled by adjusting an adjusting needle of the flow adjuster. The valve has the advantages that the opening height, discharge coefficient, discharge time and opening andclosing pressure difference can be adjusted and the opening height can be observed at any time and the like, and the safety valve is suitable to be used for various medium pipelines and vessels.

The invention provides a method and apparatus for monitoring a battery in an uninterruptible power supply. The method comprises: external power inputting to an uninterruptible power supply is stopped and a battery in the uninterruptible power supply provides power for a load; when the battery provides power for the load, a discharge coefficient of the battery and discharge time of the battery for releasing the stored electricity by a first predetermined percentage are detected; according to the discharge coefficient of the battery, one standard discharge curve is selected from a plurality of standard discharge curves of the battery; and the discharge time and the standard discharge curve are compared to determine whether the battery fails to work.

A dry sprinkler for a fire protection system. The preferred dry sprinkler has a metallic disc annulus positionable within a passageway to skew a central axis of a face of the metallic disc annulus with respect to a longitudinal axis of the dry sprinkler so that an expected minimum flow rate based on a rated discharge coefficient is provided. The dry sprinkler operates to provide an expected flow rate over a range of start pressures. The expected flow rate is based on a K-factor rating. The dry sprinkler provides an acceptable level of fluid flow rate from the expected flow rate based on the K-factor for a range of start pressures.

The present invention provides a method and apparatus for the measurement of a pressure differential across a differential pressure flow meter ΔP₁ and the line pressure drop due to friction ΔP_f along a length L of pipe. Subsequently, the quantity (formula) is calculated, enabling the inline calculation of multiple properties of the flow. Calculated flow properties include friction factor, Reynolds number, discharge coefficient, density, viscosity, and corrected flowrate. The present invention further relates to a method of calibration of a differential flow meter and a calibration apparatus for a differential flow meter utilising the same principles.