Ventilation type air cleaner and ventilation system having the same
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Solution Overview
Problem
Current ventilation systems using total heat exchangers struggle with efficient filtration of ultrafine dust and require frequent replacement of filters, leading to high maintenance costs and reduced indoor air quality due to the installation of low-grade HEPA filters and issues with dew condensation affecting filter functionality.
Innovation Solution
A ventilation type air cleaner with a rotating filter assembly that sequentially passes through purification, washing, and sterilization parts, using a conductive fiber filter and HEPA filter to achieve 99% ultrafine dust filtration, reducing the burden on the total heat exchanger and enabling semi-permanent filter use, while also integrating sensors and a controller for improved air quality management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a HEPA filter with 99% fine dust collection rate is installed, then ultrafine dust filtration is improved, but the cost and complexity of the system increases
Solution Approach 1:
The filtration system is divided into two independent stages: a pre-filter that captures larger dust particles and a HEPA filter that captures ultrafine dust. This segmentation allows each filter to be optimized for its specific function, achieving 99% ultrafine dust filtration without requiring the entire system to be overly complex.
Solution Approach 2:
The pre-filter performs preliminary filtration of larger dust particles before air enters the HEPA filter. This preliminary action protects the HEPA filter from rapid clogging and extends its service life, maintaining high filtration efficiency without increasing system complexity.
2Reliability
If a pre-filter and HEPA filter are equipped in the total heat exchanger, then dust filtration is improved, but dew condensation occurs in heat exchange elements affecting filter functionality
Solution Approach 1:
The filtration system (pre-filter and HEPA filter) is extracted from the total heat exchanger and placed in a separate housing. This separation prevents dew condensation in the heat exchange elements from affecting filter functionality, while maintaining effective dust filtration.
Solution Approach 2:
A separate housing structure acts as an intermediary between the external air source and the total heat exchanger. This intermediary housing provides a dedicated environment for the filters, isolating them from the dew condensation issues in the heat exchange elements while still allowing filtered air to be supplied to the heat exchanger.
3Quantity of substance
If low grade HEPA filters are installed, then system cost is reduced, but ultrafine dust flows into rooms as is
Solution Approach 1:
The filtration system uses a two-stage approach with a pre-filter for larger particles and a HEPA filter for ultrafine dust. This segmentation enables effective ultrafine dust collection at a lower overall cost compared to using a single high-grade filter throughout.
Solution Approach 2:
The system changes the filtration parameter approach by using a pre-filter to remove larger particles first, reducing the burden on the HEPA filter. This allows the use of a standard HEPA filter (99% efficiency) rather than requiring a higher-grade filter, thereby reducing cost while maintaining ultrafine dust collection performance.
4Reliability
If pre-filter and HEPA filter replacement cycle is set to 3 months, then filter performance is maintained, but maintenance effort and cost increase
Solution Approach 1:
The filtration system is segmented into a pre-filter and a HEPA filter with different replacement cycles. The pre-filter is replaced more frequently (3 months) while the HEPA filter is replaced less frequently (6 months or longer). This segmentation reduces overall maintenance time and cost compared to replacing both filters every 3 months, while maintaining filter performance.
Solution Approach 2:
The system implements periodic maintenance with different replacement intervals for different filter components. The pre-filter is maintained on a 3-month cycle while the HEPA filter follows a 6-month or longer cycle, optimizing the balance between performance and maintenance burden.
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 significantly reduces maintenance costs and extends filter replacement cycles, enhances indoor air quality management by filtering ultrafine dust to 99% and providing real-time air quality information, thereby improving the efficiency and effectiveness of ventilation systems.
Implementation Method 1
a conductive fiber filter and HEPA filter to achieve 99% ultrafine dust filtration
Implementation Method 2
the total heat exchanger includes a pre-filter and a high efficiency particulate air filter (HEPA) filter for filtering the dust
Implementation Method 3
A total heat exchanger is provided to exchange heat between indoor air discharged to the outside and external air (outdoor air) flowing into a room
Implementation Method 4
when a temperature difference between indoor air and external air is significant, dew condensation may occur in a heat exchange element
Data Source
AI summary
A ventilation type air cleaner includes a housing having a central rotating shaft including a purification part, a washing part, and a sterilization part in a circumferential direction with respect to the central rotating shaft, a rotating unit installed to be rotatable about the central rotating shaft as a rotation center in the housing, a filter assembly detachably coupled to the rotating unit and configured to sequentially pass through the purification part, the washing part, and the sterilization part according to rotation of the rotating unit, an intake duct connected to the housing and configured to guide a flow of air introduced to the purification part, and an exhaust duct connected to the housing and configured to guide a flow of air discharged from the purification part.