Heating and Hot Water Flow Control to Prevent Cold Air Blowing
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Solution Overview
Problem
In heating and hot water supply systems that perform simultaneous operations, the distribution ratio of the heating medium is often reduced during high hot water supply loads, leading to insufficient heat delivery to the heating terminal, causing low-temperature blowing and discomfort to users.
Innovation Solution
A system with a combustion means, heat exchanger, circulation and bypass passages, and a distribution means that adjusts the distribution ratio to prioritize hot water supply, prohibiting the blower operation at the heating terminal when the distribution ratio to the circulation passage side is below a certain value during simultaneous heating and hot water supply operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the distribution ratio of heating medium to circulation passage is reduced to prioritize hot water supply, then hot water supply capability is improved, but heating terminal heat delivery becomes insufficient causing low-temperature blowing
Solution Approach 1:
The control unit prohibits the blower operation in advance when the distribution ratio is below the threshold value, preventing low-temperature blowing before it occurs. This preliminary action ensures that the heating terminal does not experience temperature drops even when hot water supply priority reduces the heating medium flow.
Solution Approach 2:
The control unit continuously monitors the distribution ratio of the heating medium and dynamically adjusts the blower operation based on real-time conditions. When the distribution ratio falls below the threshold, the system provides feedback to stop the blower, and when it recovers, the blower operation is restored, ensuring temperature stability.
2Temperature
If the distribution ratio of heating medium to circulation passage is increased to ensure heating terminal heat delivery, then heating terminal temperature is maintained, but hot water supply capability is reduced
Solution Approach 1:
The system dynamically adjusts the blower operation based on the real-time distribution ratio. Instead of maintaining a fixed distribution ratio, the system allows the ratio to vary according to operational needs while using the control unit to manage blower operation, achieving both heating and hot water supply requirements through dynamic control.
3Object-affected harmful factors
If the blower operation is prohibited when distribution ratio is low, then low-temperature blowing is prevented, but user comfort during simultaneous operations is reduced
Solution Approach 1:
The control unit continuously monitors the distribution ratio and provides real-time feedback control of the blower operation. When the distribution ratio recovers to the threshold value or above, the system automatically restores the blower operation, ensuring user comfort is maintained whenever sufficient heat delivery is available while preventing low-temperature blowing when the distribution ratio is low.
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
Prevents low-temperature blowing by ensuring sufficient heat delivery to the heating terminal, maintaining user comfort and preventing temperature drops during simultaneous heating and hot water supply operations.
Implementation Method 1
a heat exchanger for heating a heating medium with heat generated by the combustion means
Implementation Method 2
a hot water supply heat exchanger arranged in the bypass passage
Data Source
AI summary
A heating and hot water supply system includes: a combustion means; a heat exchanger; a heating terminal; a circulation passage that connects the heat exchanger and the heating terminal; a circulation means; a bypass passage branched from the circulation passage and bypassing the heating terminal; a distribution means for distributing a heating medium to the circulation passage and the bypass passage; a hot water supply heat exchanger for the bypass passage; and a hot water supply passage; wherein the distribution means can adjust the distribution ratio so as to correspond to a heating operation, a hot water supply operation, and a simultaneous heating and hot water supply operation, and when the distribution ratio on the circulation passage side of the distribution means is smaller than a prescribed value during the simultaneous heating and hot water supply operation, the blowing operation of the blower at the heating terminal is prohibited.