Heat Exchanger Flow Balancing for Stable Shower Heat Recovery
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Solution Overview
Problem
Heat recovery systems in sanitary shower installations face reduced operational effectiveness due to unbalanced fluctuations in fluid flow rates, especially when sharing hot water supplies with other facilities, leading to inefficient heat transfer and energy loss.
Innovation Solution
A fluid flow control system that stabilizes flow rates by coordinating the operation of flow modulating devices in both supply and outlet paths of a heat exchanger, using a control device to maintain proportional fluid flow rates and optionally incorporating a bypass path for enhanced temperature and pressure control, ensuring balanced flow rates across varying conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If heat exchange devices are used in shower installations sharing hot water supply with other facilities, then energy recovery is achieved, but unbalanced fluctuations in fluid flow rates reduce heat recovery efficiency
Solution Approach 1:
The system employs flow modulating devices controlled by a control device that monitors and adjusts flow rates in real-time. The controller receives feedback from flow sensors and actuates the flow modulating devices to maintain balanced flow rates through the heat exchanger, ensuring stable heat recovery performance despite variations in hot water supply conditions
Solution Approach 2:
The flow control system automatically self-regulates by using the control device to monitor flow conditions and adjust the flow modulating devices without external intervention. The system maintains balanced flow rates through autonomous control, eliminating the need for manual adjustment and ensuring continuous optimal heat recovery operation
2Loss of energy
If dedicated water heating units are used to ensure balanced flow rates, then optimal heat exchanger performance is achieved, but system complexity and cost increase
Solution Approach 1:
The flow control system enables existing multi-functional hot water heating units to operate optimally for heat recovery applications. By adding flow modulating devices and a control device to the existing heating unit, the system achieves dedicated-unit performance without requiring a completely separate dedicated heating system, thus reducing overall system complexity
Solution Approach 2:
The flow modulating devices and control device act as intermediaries between the existing hot water heating unit and the heat exchanger. These intermediary components regulate flow rates to ensure optimal heat exchanger performance while allowing the existing heating unit to continue serving multiple facilities, avoiding the need for complex dedicated heating systems
3Adaptability or versatility
If flow rates in heat exchanger paths are allowed to fluctuate freely, then system adaptability to varying usage conditions is maintained, but heat recovery effectiveness decreases
Solution Approach 1:
The system dynamically adjusts flow rates through the heat exchanger using flow modulating devices controlled by a controller. The control device continuously monitors flow conditions and actively modulates the flow rates to maintain balance between the hot and cold water paths, ensuring optimal heat recovery effectiveness while adapting to varying usage conditions in real-time
Solution Approach 2:
The system changes flow rate parameters dynamically by using the flow modulating devices to adjust and balance the flow rates through the heat exchanger. The controller modifies these parameters in response to varying usage conditions, maintaining optimal heat transfer conditions while preserving system adaptability to different operational scenarios
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
The system maintains consistent and balanced fluid flow rates, enhancing heat recovery efficiency and stability of outflow temperatures, even under variable usage conditions, thereby improving the overall performance and energy conservation of heat exchanger devices.
Implementation Method 1
a heat exchanger having a supply path adapted to receive fluid from a fluid supply and an outlet path adapted to receive fluid from the use region, whereby the fluid in the supply path is pre-heated by the fluid in the outlet path
Data Source
AI summary
A fluid flow control system has a heating device for heating a fluid and a first flow path for providing the heated fluid from the heating device to a use region. A heat exchanger has a supply path which is adapted to receive fluid from a fluid supply. The heat exchanger also has a outlet path adapted to receive fluid from the use region, whereby the fluid in the supply path is pre-heated by the fluid in the outlet path. A second flow path provides pre-heated fluid from the supply path of the heat exchanger to the heating device. A first flow modulating device controls fluid flow through the outlet path. A second flow modulating device controls the flow of pre-heated fluid along the supply path. A flow control device controls each of the first and second flow modulating devices such that, during use, the fluid flow rates in the fluid supply path and outlet path of the heat exchanger are balanced, so as to be substantially the same.