Dryer After-Care Cycle Using Residual Heat to Prevent Bacterial Growth
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Solution Overview
Problem
Laundry appliances lack an effective method to maintain freshness after a drying cycle, as residual moisture can lead to bacterial growth and odor, and existing technologies do not adequately address this issue.
Innovation Solution
A laundry appliance with a heat pump system and blower that maintains residual fluid within an airflow path, activating an after-care cycle to maintain a predetermined temperature range, using the heat pump system until the upper limit is reached, and deactivating it until the lower limit is approached again, with intermittent drum and blower operation to distribute heat evenly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the drying cycle is completed and the appliance is turned off, then energy consumption is reduced, but residual moisture remains in the airflow path leading to bacterial growth and odor
Solution Approach 1:
The after-care cycle is activated automatically after the drying cycle completes, performing preliminary maintenance action before the user would normally end the appliance operation. This preliminary action removes residual moisture and prevents bacterial growth while the appliance is still warm, extending the useful thermal state without requiring full drying cycle energy input.
Solution Approach 2:
The heat pump operates in periodic cycles during the after-care mode, activating when moisture is detected in the airflow path and deactivating when the environment is sufficiently dry. This periodic operation maintains freshness without continuous energy consumption, resolving the contradiction between preventing bacterial growth and reducing energy use.
2Object-affected harmful factors
If the heat pump system operates continuously to maintain freshness, then bacterial growth is prevented, but energy consumption increases
Solution Approach 1:
The control system continuously monitors moisture levels in the airflow path and drum environment, using this feedback to determine when the heat pump should activate or deactivate. This feedback mechanism ensures the heat pump operates only when necessary to prevent bacterial growth, avoiding continuous operation and unnecessary energy consumption.
Solution Approach 2:
The after-care cycle uses the residual heat already present in the drum and airflow path from the drying cycle, rather than requiring full heating capacity. The system serves itself by utilizing the existing thermal energy to continue preventing bacterial growth without requiring additional energy input equivalent to a full drying cycle.
3Object-affected harmful factors
If high temperature is applied to kill bacteria, then freshness is maintained, but fabric damage may occur
Solution Approach 1:
The after-care cycle operates at lower temperatures compared to the high-temperature drying cycle, changing the temperature parameter from high (drying) to low (maintenance). This parameter change is sufficient to prevent bacterial growth and maintain freshness while avoiding the fabric damage that would result from sustained high-temperature exposure.
Solution Approach 2:
The heat pump provides partial heating action during the after-care cycle, delivering just enough thermal energy to maintain freshness and prevent bacterial growth without applying excessive heat. This partial action is sufficient for the maintenance function while protecting fabric integrity from overheating damage.
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 after-care cycle effectively kills bacteria, prevents odor growth, and keeps laundry fresh for an extended period without damaging fabrics, reducing the need for additional fragrances and allowing for longer storage of laundry.
Implementation Method 1
A heat pump system is activated and a blower delivers the residual fluid to the drum. A drum temperature is maintained within the drum at a predetermined temperature range during performance of the after-care cycle.
Implementation Method 2
a blower delivers process air through an air flow path that includes the rotating drum and the heat exchanger
Data Source
AI summary
A method for processing laundry after completion of a drying cycle includes maintaining residual fluid within an airflow path of the appliance, wherein the residual fluid results from a primary drying cycle. A heat pump system is activated and a blower delivers the residual fluid to the drum. A drum temperature is maintained within the drum at a predetermined temperature range during performance of the after-care cycle.