Method of controlling a fluid circulation system
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Solution Overview
Problem
In fluid circulation systems, particularly in HVAC systems, setting the pressure differential setpoint is often a manual and inaccurate process, influenced by site-specific factors like pipe length and terminal device configuration, requiring user expertise and leading to inefficiencies.
Innovation Solution
A method to determine the pressure differential setpoint by establishing a correlation between fluid flow rates and pressure differentials through varying pump operation speeds, allowing the system to automatically maintain a desired flow rate matching the HVAC system's cooling capacity, eliminating the need for user intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual pressure differential setpoint configuration is used, then user expertise can be applied to site-specific factors, but the process becomes time-consuming and inaccurate
Solution Approach 1:
The system performs self-configuration by automatically determining the pressure differential setpoint based on measured flow rates and system characteristics, eliminating the need for manual user input and expertise while improving accuracy through automated calculations
Solution Approach 2:
The manual configuration process is replaced with an automated electronic system that uses sensors, processors, and algorithms to determine the pressure differential setpoint, substituting human expertise with computational methods
2Adaptability or versatility
If fixed pressure differential setpoint is used, then system configuration is simple, but the fluid flow rate cannot adapt to varying HVAC cooling capacity requirements
Solution Approach 1:
The pressure differential setpoint transitions from a fixed value to a dynamic parameter that automatically adjusts based on real-time measurements of fluid flow rate and HVAC cooling capacity, enabling the system to adapt to varying operational requirements
Solution Approach 2:
The system continuously measures the actual fluid flow rate and HVAC cooling capacity, then uses this feedback information to automatically adjust the pressure differential setpoint, creating a closed-loop control system that adapts to changing conditions
Data Source
AI summary
Methods as disclosed herein are generally configured to help determine a pressure differential (or pressure head) in a fluid circulation system of for example, a HVAC system, for controlling the fluid circulation system. The method may include obtaining a correlation between a fluid flow rate and a pressure differential in the fluid circulation system by varying an operation speed of the pump. The method may also include obtaining a desired fluid flow rate for matching a cooling capacity of the HVAC system and determining a pressure differential setpoint corresponding to the desired fluid flow rate based on the correlation between the fluid flow rate and the pressure differential. The methods can be executed by, for example, a controller of the HVAC system so as to eliminate the requirement of a user to set up the pressure differential.