Common-Vent Hot-Water Supply Control for Combustion Stability
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Solution Overview
Problem
In connected hot-water supply systems using a common vent system, differences in combustion exhaust pressure among hot-water suppliers can lead to combustion failure due to varying fan rotation speeds, causing exhalation resistance and hindering smooth operation.
Innovation Solution
A connection control unit regulates the combustion amount and fan rotation speed of each hot-water supplier to reduce pressure differences by adjusting the combustion amount and water flow, using a combustion regulator that acquires operation data from hot-water supply controllers to ensure balanced operation and prevent combustion failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a common vent system is adopted to connect exhaust ducts of multiple hot-water suppliers, then the cost and installing space of exhaust ducts are reduced, but pressure differences in combustion exhaust among suppliers may cause combustion failure
Solution Approach 1:
The patent applies dynamics by making the fan rotation speeds adjustable and controllable. The connection control unit dynamically adjusts the rotation speeds of fans in different hot-water suppliers to balance the combustion exhaust pressure, transforming a static common vent system into a dynamically balanced system that prevents combustion failure while maintaining cost efficiency
Solution Approach 2:
The patent implements feedback control where the connection control unit monitors the operation status of multiple hot-water suppliers and adjusts fan rotation speeds based on detected pressure differences. This closed-loop feedback mechanism ensures that combustion exhaust pressure is balanced across all suppliers connected to the common vent system, preventing combustion failure
2Use of energy by moving object
If fan rotation speed is reduced to match lower combustion amount, then energy consumption is reduced, but combustion exhaust pressure drops causing exhalation resistance and combustion failure
Solution Approach 1:
The connection control unit continuously monitors combustion exhaust pressure and provides feedback to adjust fan rotation speeds. When one supplier operates at low combustion amount, the system detects the resulting pressure drop and adjusts other fans to compensate, ensuring all suppliers maintain adequate exhaust pressure without wasting energy on unnecessarily high fan speeds
Solution Approach 2:
The patent changes the operational parameters of the fans by adjusting rotation speeds individually for each hot-water supplier. Instead of running all fans at fixed high speeds, the system optimizes each fan's rotation speed according to its supplier's actual combustion amount, reducing energy consumption while preventing pressure-related combustion failure through coordinated parameter adjustment
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 reduces pressure differences among hot-water suppliers, preventing combustion failure and ensuring stable hot-water supply by dynamically adjusting fan rotation speeds and combustion amounts based on detected variations in water flow and temperature.
Implementation Method 1
a heat exchanger provided in the water flow passage, a burner configured to heat the heat exchanger
Implementation Method 2
a fan configured to make combustion air and combustion exhaust of the burner forcibly flow
Implementation Method 3
a burner configured to heat the heat exchanger
Data Source
AI summary
To provide a connected hot-water supply system capable of preventing combustion failure of the burner of each hot-water supplier during hot-water supply operation to achieve stable hot-water supply operation. When dispersion in the rotation speed of a fan 15 among respective hot-water suppliers 1 is detected, a connection control unit 2 regulates the combustion amount of each of the hot-water suppliers 1 so as to reduce a difference in the rotation speed of the fan 15 among the respective hot-water suppliers 1.