Electrostatic Ventilation Filter Layout for Compact Heat Recovery
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Solution Overview
Problem
Conventional filters in decentralized living space ventilation systems are inefficient in removing fine dust particles and require frequent replacement, leading to hygiene issues and increased pressure losses, while electrostatic precipitators are too long and energy-intensive for compact installations.
Innovation Solution
A combined filter arrangement integrating an electrostatic precipitator with additional heat storage elements, designed to optimize space usage and energy efficiency, where the electrostatic precipitator and heat storage elements are intertwined to reduce overall length and power consumption, and the system is controlled to operate only during necessary times for energy savings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional filter mats are used for fine dust filtration, then the system is simple and inexpensive, but the filter performance is insufficient and pressure losses increase over time
Solution Approach 1:
The patent replaces the mechanical filtration system (filter mats that physically block particles) with an electrostatic precipitation system that uses electrical fields to charge and collect particles. This substitution enables effective fine dust removal without the clogging and pressure loss issues of conventional mechanical filters
Solution Approach 2:
The patent changes the operating parameters by applying high voltage (several kilovolts) to create electrostatic fields that enable particle separation. This parameter change allows the system to achieve high filtration efficiency for fine dust particles while maintaining low pressure losses throughout the filter's service life
2Reliability
If electrostatic precipitators are used for fine dust filtration, then the filter performance is high, but the overall length and power consumption are too high for compact installations
Solution Approach 1:
The patent merges the electrostatic precipitator with the heat accumulator into a single integrated component. The precipitator plates are arranged within the heat accumulator structure, allowing both fine dust filtration and heat recovery functions to be performed in the same space, thereby reducing the overall length of the ventilation unit
Solution Approach 2:
The patent arranges the precipitator plates in a counterflow configuration within the heat accumulator, utilizing the three-dimensional space efficiently. This dimensional arrangement allows the air flow to pass through both the electrostatic field and heat exchange surfaces without requiring excessive length
3Reliability
If electrostatic precipitators are used for fine dust filtration, then the filter performance is high, but the power consumption is too high for energy-efficient operation
Solution Approach 1:
The patent combines the electrostatic precipitator function with the heat accumulator function in a single integrated component. This merging allows the system to achieve high fine dust filtration efficiency while simultaneously recovering heat, thereby reducing the overall energy consumption of the ventilation system
Solution Approach 2:
The patent designs the system so that the heat accumulator serves dual purposes: heat recovery and housing for the electrostatic precipitator. This self-service arrangement eliminates the need for separate filtration components, reducing total energy consumption while maintaining high filtration efficiency
4Ease of manufacture
If conventional filter mats are used, then the initial cost is low, but frequent replacement is required leading to hygiene issues and maintenance problems
Solution Approach 1:
The patent replaces disposable mechanical filter mats with a reusable electrostatic precipitation system. The electrostatic plates can be cleaned and reused indefinitely, eliminating the hygiene problems associated with clogged filters and frequent replacements while maintaining effective fine dust filtration
Solution Approach 2:
Instead of discarding clogged filter mats, the patent enables recovery and reuse of the electrostatic precipitator components through cleaning. The plates can be washed and reused, preventing hygiene degradation and eliminating the need for frequent replacements
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 provides effective fine dust filtration with compact sizes and reduced energy consumption, suitable for decentralized ventilation systems with low wall thickness, while maintaining high heat recovery rates and easy maintenance.
Implementation Method 1
The particles to be separated are first electrically charged by a so-called ionizer. This is done by so-called corona discharges using thin corona wires
Implementation Method 2
The charged particles are deposited on the plates (especially the negatively charged plates) so that the air behind the plates is largely particle-free
Implementation Method 3
the above-mentioned decentralized living space ventilation systems usually have a heat accumulator, which is heated by reversing operation of the fan means in the ventilation mode by warm interior air that is routed to the outside and then, in the reverse operating mode, preheats the inflowing, generally cooler, outside air
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
The invention relates to a ventilation unit for decentralised room ventilation systems, in which unit at least one reversible fan means (16) and a heat reservoir element (24) are supplemented by an electrostatic precipitator for air purification. In addition, a filter assembly is provided for a ventilation system, in particular for a decentralised room ventilation system, comprising an air duct (30) with an electrostatic precipitator through which an air stream to be purified is forced, said precipitator extending over a predetermined section of the air duct (30). The filter assembly has in addition, in the predetermined electrostatic-precipitator section (18) of the air duct, at least one heat reservoir element (24) impinged by the air stream, the electrostatic precipitator and the heat reservoir element thus being spatially restricted relative to one another.