Flow Heater Rinsing Station to Prevent Limescale Buildup
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Solution Overview
Problem
Water systems with flow heaters are prone to lime precipitation at high temperatures, which reduces performance and lifespan, and existing flushing stations primarily address contamination risks rather than lime precipitation.
Innovation Solution
A water system with a flushing station coupled to the flow heater that flushes until the water temperature falls below a predetermined target, typically around 40°C, to prevent lime precipitation, using a control device that communicates with the flow heater to initiate flushing upon warm water extraction cessation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the flow heater heats water to high temperatures for consumer use, then the hot water supply function is improved, but limescale precipitation occurs in the flow heater reducing performance and lifespan
Solution Approach 1:
The system performs a preliminary flushing action immediately when hot water consumption stops, cooling the water in the flow heater before limescale can precipitate. The control device initiates the flushing sequence as soon as it detects that the hot water tap is closed, preventing the harmful effect before it occurs.
Solution Approach 2:
The system uses the cold supply water, which would otherwise just sit in the pipes, as a beneficial cooling agent to rapidly cool the flow heater contents. By directing this cold water through the flow heater, the system converts a potentially stagnant resource into an active cooling mechanism that prevents limescale formation.
2Use of energy by moving object
If the flow heater is switched off immediately after warm water withdrawal ends, then energy consumption is reduced, but warm water stagnates in the flow heater causing limescale precipitation
Solution Approach 1:
The system uses hydraulic principles to force cold water through the flow heater at sufficient pressure and flow rate to rapidly cool the contents. The flushing sequence opens the supply valve and uses the pressure differential to drive water through the heat exchanger, achieving effective cooling without requiring additional energy input.
Solution Approach 2:
The system maintains continuous protective action by immediately initiating the flushing sequence when consumption stops, ensuring there is no time gap during which warm water could stagnate. The control device continuously monitors the hot water tap status and triggers the cooling sequence without interruption.
3Reliability
If a flushing station is used to cool the flow heater water, then limescale precipitation is prevented, but water is consumed during the flushing process
Solution Approach 1:
The system applies partial flushing rather than complete drainage, using just enough cold water to cool the flow heater contents to below 50°C. The flushing sequence is controlled to stop once the temperature threshold is reached, avoiding excessive water consumption while still achieving the protective cooling effect.
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
Effectively prevents lime precipitation by ensuring the water in the flow heater cools below the critical temperature, thereby extending the system's operational life and reducing maintenance.
Implementation Method 1
a flow heater (1) having a hot water outlet (5) connected to the hot water pipe (3) and having a supply water inlet (7) connected to the supply water pipe (6)
Implementation Method 2
the hot water pipe (3) is flushed until the temperature of the water contained in the flow heater (1) is below a predetermined target temperature
Data Source
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AI summary
The invention relates to a water system with a hot water pipe (3) for supplying at least one first consumer (4, 4a, 4b) connected to it with hot water, and a flow heater (1) connected to the hot water pipe (3), in which introduced cold water can be heated. If heated water remains in the flow heater because only part of it is used, limescale deposits can reduce the performance and service life of the flow heater. Limescale deposits occur preferentially with stagnant warm water. The present invention seeks to remedy this problem by providing a rinsing station (2) connected to the hot water pipe (3), by means of which standing water in the hot water pipe can be drained in chronological order until the water contained in the flow heater (1) is below a predetermined target temperature.