Tank Pressure Correction for Accurate Dynamic Flow Rate Calculation
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Solution Overview
Problem
Existing flow rate calculation systems using the dynamic constant volume method incur errors due to adiabatic compression in the tank, leading to inaccuracies in estimating the actual flow rate through the flow rate control device.
Innovation Solution
A flow rate calculation system that includes a tank, an inflow line, a pressure sensor, and a flow rate correction part, which corrects the estimated flow rate based on the pressure change data by using a first pressure detected after a predetermined time has elapsed and a second pressure higher than the first pressure, thereby mitigating the effects of temperature rise caused by adiabatic compression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the dynamic constant volume method is used to calculate flow rate, then the flow rate can be estimated using pressure change rate, but adiabatic compression causes temperature rise leading to measurement errors
Solution Approach 1:
The system waits for a predetermined time after stopping fluid inflow before using the pressure sensor reading for correction. This preliminary waiting period allows the fluid temperature to stabilize after adiabatic compression, eliminating the harmful temperature effect before measurement correction is applied.
Solution Approach 2:
The system uses pressure sensor data from two different time points (during inflow and after predetermined time) to calculate a correction factor, which is then applied to correct the flow rate calculation. This feedback mechanism compensates for the measurement errors caused by adiabatic compression.
2Productivity
If pressure change rate during inflow period is used for calculation, then flow rate can be determined dynamically, but the value is affected by temperature rise from adiabatic compression
Solution Approach 1:
The system performs a preliminary waiting period after stopping inflow to allow temperature stabilization, then uses this stabilized pressure reading to correct the dynamic flow rate calculation, thereby maintaining both speed and accuracy.
Solution Approach 2:
The system changes the temporal parameter by measuring pressure at two different time points (during inflow and after predetermined time) to derive a correction factor, transforming the measurement approach to eliminate temperature effects while maintaining dynamic calculation capability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly reduces errors in estimating the flow rate, enabling a more accurate calculation of the actual flow rate by accounting for the temperature rise associated with adiabatic compression, thus improving the precision of the flow rate measurement.
Implementation Method 1
a pressure sensor that detects the pressure inside the tank
Implementation Method 2
in the process of flowing the fluid flowing through the flow rate control device into the tank, adiabatic compression occurs in the tank to raise the temperature of the fluid
Data Source
AI summary
In order to accurately calculate an estimated flow rate by a dynamic constant volume method, a flow rate calculation system including a tank into which fluid flows, an inflow line through which the fluid flows into the tank, and a pressure sensor that detects the pressure inside the tank is adapted to include: a pressure change data storage part that stores pressure change data indicating a temporal change in the pressure detected by the pressure sensor during an inflow period; a flow rate calculation part that calculates the estimated flow rate during the inflow period based on a pressure change rate; and a flow rate correction part that, on the basis of first pressure detected by the pressure sensor after a predetermined time has elapsed after the inflow period and second pressure included in the pressure change data and higher than the first pressure, corrects the estimated flow rate.