HVAC Flow Control Using Secondary Circuit Temperature Feedback
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Solution Overview
Problem
Existing HVAC systems operating with thermal energy transfer devices connected by primary and secondary fluid circuits often operate sub-optimally due to neglecting conditions within the secondary fluid circuit when controlling parameters of the primary fluid circuit.
Innovation Solution
A method and flow control device that determine and control the flow rate of the primary fluid circuit based on the temperature of the secondary fluid circuit, using sensors and actuators to maintain optimal thermal energy transfer rates and prevent overheating or freezing, ensuring efficient operation and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the flow rate of the primary fluid circuit is controlled without considering secondary fluid circuit conditions, then the system operation is simplified, but the thermal energy transfer efficiency deteriorates
Solution Approach 1:
The system implements feedback control by continuously monitoring the temperature of the secondary fluid circuit and using this information to adjust the flow rate of the primary fluid circuit. The processing unit receives temperature data from sensors in the secondary circuit and dynamically modifies the primary circuit flow rate accordingly, creating a closed-loop control system that optimizes thermal energy transfer efficiency while maintaining operational simplicity.
2Productivity
If the flow rate of the primary fluid circuit is increased to improve thermal energy transfer, then the thermal energy transfer rate improves, but the energy consumption increases
Solution Approach 1:
The system employs dynamic flow rate adjustment based on real-time temperature conditions in the secondary fluid circuit. Rather than maintaining a constant high flow rate, the system dynamically adapts the primary circuit flow rate to match actual thermal energy transfer needs, ensuring optimal transfer rates while minimizing unnecessary energy consumption during periods of lower demand.
Solution Approach 2:
The control system changes the flow rate parameter of the primary fluid circuit based on detected temperature parameters of the secondary fluid circuit. By continuously adjusting this parameter according to actual thermal conditions, the system achieves high thermal energy transfer rates when needed while reducing energy consumption when thermal demand is lower.
3Device complexity
If the flow rate of the primary fluid circuit is not monitored and controlled, then the system complexity is reduced, but the system reliability deteriorates
Solution Approach 1:
The system incorporates feedback mechanisms with temperature sensors in the secondary fluid circuit and a processing unit that continuously monitors thermal conditions. This feedback loop enables the system to detect and respond to abnormal thermal conditions, preventing failures and ensuring reliable operation without requiring overly complex monitoring infrastructure.
Solution Approach 2:
The system performs self-monitoring and self-adjustment of the primary fluid circuit flow rate based on temperature conditions in the secondary circuit. The processing unit automatically detects thermal conditions and adjusts flow rates without external intervention, enabling the system to maintain high reliability through autonomous operation while keeping the control architecture relatively simple.
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 enhances the operational efficiency and reliability of HVAC systems by optimizing thermal energy transfer, preventing system failures, and ensuring consistent comfort levels while minimizing energy consumption and wear on components.
Implementation Method 1
a thermal energy transfer device fluidically connected to a thermal energy source by a primary fluid circuit and further fluidically connected to thermal energy consumer(s) by a secondary fluid circuit
Data Source
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AI summary
Method of operating an HVAC system (1) comprising a thermal energy transfer device (200) fluidically connected to a thermal energy source (100) by a primary fluid circuit (400) and further fluidically connected to thermal energy consumer(s) (300) by a secondary fluid circuit (500), the method comprising determining a flow rate (Φ) of a fluid in the primary fluid circuit (400); determining a temperature of a fluid in the secondary fluid circuit (500); and controlling, by a flow control device (10) arranged in the primary fluid circuit (400), the flow rate (Φ) of the fluid in the primary fluid circuit (400) using the temperature of the fluid in the secondary fluid circuit (500).