Heat Exchanger Flow Control Using Temperature Difference Feedback
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Solution Overview
Problem
Existing air conditioning and heating systems face inefficiencies due to excessive carrier fluid flow rates, leading to unnecessary energy waste and suboptimal energy exchange, particularly in systems serving multiple rooms.
Innovation Solution
A control process and device that regulate the flow rate of carrier fluid through heat exchangers by adjusting the flow regulator based on temperature differences across the exchanger, optimizing the flow rate to balance heat exchange efficiency and prevent excessive flow-related losses, using sensors to monitor temperature and flow parameters and adjust the flow regulator in a cyclical manner until a minimum threshold is met.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the flow rate of carrier fluid is increased to enhance heat exchange efficiency, then the heat exchange performance is improved, but the load losses and energy waste increase significantly
Solution Approach 1:
The system dynamically adjusts the flow rate of carrier fluid through automated control based on actual heat exchange requirements. The control unit continuously monitors temperature differences and flow rates, then modulates the flow regulator to maintain optimal operating conditions, preventing both excessive flow (causing load losses) and insufficient flow (reducing heat exchange efficiency).
Solution Approach 2:
The system implements a closed-loop feedback control mechanism where sensors continuously measure temperature differences across heat exchangers and flow rates, feed this information to the control unit, which then adjusts the flow regulator accordingly. This feedback loop ensures the flow rate is optimized in real-time to maximize heat exchange efficiency while minimizing load losses and energy waste.
2Reliability
If the flow rate is maintained at high values to ensure adequate heat supply to all rooms, then the heat delivery is sufficient, but unnecessary energy waste occurs in branches that do not require high flow
Solution Approach 1:
The system segments the heating/cooling network into individual controllable branches, each equipped with its own flow regulator and control unit. This allows independent optimization of flow rates in each branch based on local heat exchange requirements, rather than maintaining high flow rates throughout the entire system. Each branch can be adjusted to deliver adequate heat supply while minimizing energy waste specific to that branch.
Solution Approach 2:
The system applies local quality control by allowing each branch to have its own optimized flow rate based on local conditions (heat exchange requirements, room temperature needs). Instead of uniform high flow rates across all branches, each branch receives the specific flow rate it needs, ensuring adequate heat supply locally while eliminating energy waste in branches that require lower flow.
3Ease of operation
If manual control methods are used to adjust flow rates, then the system is simple to operate, but the control precision and optimization capability are insufficient
Solution Approach 1:
The system implements self-service control where the automated control units independently monitor system conditions, calculate optimal flow rates, and adjust flow regulators without requiring manual intervention. This maintains ease of operation (users simply set desired room temperatures) while achieving high control precision through continuous automated optimization based on real-time measurements of temperature differences and flow rates.
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 solution optimizes energy management in air conditioning and heating systems by ensuring efficient heat exchange while minimizing energy waste, maintaining optimal operating conditions for the flow regulator and reducing unnecessary flow rates, thereby improving overall system efficiency.
Implementation Method 1
at least one temperature sensor (9; 9a, 9b) configured to emit at least one temperature signal related to a temperature difference (ΔTi)
Implementation Method 2
at least one heat exchange unit (7)
Data Source
AI summary
A method to control a carrier fluid through a service line (5) of a conditioning and/or heating system (1). The service line includes a heat exchange unit (7), a flow regulator (8), temperature sensors (9; 9a, 9b) detecting a temperature difference (ΔTi) between the carrier fluid in a first section (5a) of the service line (5) upstream of said heat exchange unit (7) and carrier fluid in a second section (5b) of the service line (5) downstream of the same heat exchange unit (7). The method includes calculating a value assumed by a control parameter (Pc) which is a function of at least one or more values assumed by the temperature difference in the transition of the flow regulator from a first to a second operating condition, for then determining whether the value of the control parameter (Pc) is higher than a threshold (S).