Heating and Hot-Water Control for Warm Air Temperature Stability
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Solution Overview
Problem
Central heating systems experience discomfort due to temperature drops when transitioning from heating to simultaneous heating and hot-water supply operations, particularly with warm air heaters, where reduced heat supply leads to lower warm air temperatures that can cause discomfort to users.
Innovation Solution
A heating and hot-water supply device with a control system that adjusts the distribution ratio and target heat medium temperature to maintain heat supply during transitions, using a combustion means, heat exchanger, circulation and bypass passages, and temperature detection to prioritize heat distribution to the heating terminal, especially raising the target heat medium temperature when a warm air heater is used.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hot water supply is prioritized during simultaneous heating and hot-water supply operation, then hot water supply efficiency is improved, but heat supplied to heating terminal is reduced and heating capacity drops
Solution Approach 1:
The distribution ratio of the distribution means is dynamically adjusted based on the type of heating terminal. For warm air heaters, the system maintains a distribution ratio that prevents excessive hot water supply flow rate, while for radiators and floor heating devices, the distribution ratio can be optimized for hot water supply. This dynamic adjustment resolves the contradiction by adapting the system behavior to the specific heating terminal type.
Solution Approach 2:
The system changes the operational parameters (distribution ratio and hot water supply flow rate) based on the heating terminal type. When a warm air heater is detected, the system limits the hot water supply flow rate to a predetermined value or below, whereas other heating terminals allow higher flow rates. This parameter change ensures heating capacity is maintained for warm air heaters while enabling efficient hot water supply for other terminal types.
2Productivity
If heat is reduced for heating terminal during simultaneous operation, then hot water supply is improved, but warm air temperature drops and user discomfort increases
Solution Approach 1:
The system detects the heating terminal type and changes the hot water supply flow rate parameter accordingly. For warm air heaters, the flow rate is limited to prevent temperature drops that cause user discomfort. For radiators and floor heating devices, higher flow rates are permitted since these terminals are less sensitive to temperature variations. This selective parameter adjustment resolves the contradiction between hot water supply capability and user comfort.
3Productivity
If distribution ratio is optimized for hot water supply, then hot water supply efficiency is improved, but heat supply to heating terminal is reduced
Solution Approach 1:
The system applies different distribution strategies to different heating terminal types. For warm air heaters, the distribution ratio is controlled to maintain adequate heat supply, recognizing their sensitivity to temperature changes. For radiators and floor heating devices, the distribution ratio is optimized for hot water supply efficiency. This localized quality approach resolves the contradiction by tailoring the distribution strategy to the specific thermal characteristics of each heating terminal type.
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 solution effectively suppresses temperature drops in warm air heaters during simultaneous heating and hot-water supply operations, ensuring comfortable temperatures by compensating for reduced heat supply through increased target heat medium temperatures and optimized distribution ratios.
Implementation Method 1
a heat exchanger which exchanges heat between the heating heat-medium and a high-temperature combustion gas generated in the combustion part
Implementation Method 2
a combustion part which burns a fuel
Implementation Method 3
a hot-water supply heat exchanger which exchanges heat between the heating heat-medium and water for hot water supply
Implementation Method 4
a circulation means is provided in the circulation passage to circulate the heating heat-medium
Implementation Method 5
a heating heat exchanger and a blower which exchange heat between the heating heat-medium and air
Implementation Method 6
the air in the room is sent to the heating heat exchanger by the blower, and the air heated by the heating heat exchanger is blown into the room as warm air
Implementation Method 7
A radiator and a floor heating device which heat by radiant heat of the heating heat-medium and natural convection of air
Implementation Method 8
A radiator and a floor heating device which heat by radiant heat of the heating heat-medium and natural convection of air
Data Source
AI summary
A heating and hot-water supply device includes a combustion means, a heat exchanger, a circulation passage, a circulation means, a bypass passage, a distribution means, a hot-water supply heat exchanger, a water supply passage, a hot-water supply passage, and a control means. The heat exchanger heats a heating heat-medium to a target heat medium temperature. The distribution means distributes the heating heat-medium to the circulation passage and the bypass passage. The control means is capable of adjusting a distribution ratio of the distribution means to be adaptable to a heating operation, a hot-water supply operation, and a simultaneous heating and hot-water supply operation. At the time of transition from the heating operation to the simultaneous heating and hot-water supply operation, in a case where the heating terminal for performing heating is a warm air heater, the control means raises the target heat medium temperature.