Hot beverage preparation apparatus comprising a continuous flow heater
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Solution Overview
Problem
Continuous flow heaters in fully automatic coffee machines experience long heating-up times and significant limescale formation, especially when operating at high heating powers, due to residual hot water left in the system after brewing.
Innovation Solution
Implementing a controller to rapidly cool down the continuous flow heater by switching it off shortly before the end of a beverage drawing operation, using a drainage valve to direct residual water into a wastewater line, and post-cooling the heater with fresh water after brewing, thereby reducing limescale deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a continuous flow heater is operated at high heating power to heat water quickly, then the heating speed is improved, but limescale formation increases significantly
Solution Approach 1:
The controller switches off the continuous flow heater shortly before the pre-specified quantity of hot water is completely drawn, proactively preventing the heater from remaining hot and reducing limescale formation in residual water
Solution Approach 2:
The system changes the operational parameters by switching off the heater at an optimized moment, altering the temperature parameter of residual water from high to lower, thereby reducing limescale deposition
2Object-generated harmful factors
If the continuous flow heater is switched off early to reduce limescale formation, then limescale deposition is reduced, but the beverage temperature may be affected
Solution Approach 1:
The controller monitors the drawing operation and switches off the heater at an optimized moment based on the pre-specified quantity of hot water, balancing temperature maintenance with limescale reduction
Solution Approach 2:
The heater provides slightly more than the minimum required heating duration, ensuring beverage temperature is maintained while switching off early enough to reduce limescale formation in residual water
3Productivity
If residual hot water remains in the continuous flow heater after beverage drawing, then the heater is ready for the next operation, but limescale forms more quickly
Solution Approach 1:
The heater is switched off proactively before the beverage drawing operation completes, preventing residual water from remaining at high temperature and reducing limescale formation while maintaining readiness for the next operation
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
This approach significantly reduces limescale formation on the continuous flow heater, maintaining beverage quality and efficiency while minimizing heating-up times.
Implementation Method 1
the heating arrangement (114) is switched off shortly before the pre-specified quantity of hot water is completely drawn
Implementation Method 2
The drainage valve (16) can be opened during a heating-up phase of the continuous flow heater and the water arriving from the continuous flow heater can be conducted into the wastewater line
Implementation Method 3
post-cooling the heater with fresh water after brewing, thereby reducing limescale deposition
Data Source
AI summary
In order to reduce limescale formation on the continuous flow heater during operation of an apparatus for preparing freshly brewed hot beverages which has a hot water generator, which is embodied as a continuous flow heater, and a brewing apparatus, to which hot water from the hot water generator can be supplied, a controller for actuating the continuous flow heater is provided, which controller switches on the continuous flow heater for the purpose of drawing a pre-specified quantity of hot water and switches off said continuous flow heater shortly before the quantity of hot water is completely output, so that the temperature of the hot water at the output of the continuous flow heater is declining at the end of the drawing operation.