Combination washing/drying laundry appliance having a heat pump system with reversible condensing and evaporating heat exchangers
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Solution Overview
Problem
Conventional washing and drying appliances face challenges in efficiently switching between washing and drying modes, particularly in managing heat exchange and particulate filtration, leading to inefficiencies and maintenance issues due to direct contact of refrigerant circuits with heat exchangers.
Innovation Solution
A reversible refrigerant circuit with flow control valves directs refrigerant between heat exchangers, allowing the appliance to alternate between washing and drying modes by reversing the function of heat exchangers, ensuring efficient heat transfer and separating particulate filtration and moisture condensation mechanisms from the primary heat exchangers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional refrigerant circuit directly contacts heat exchangers during washing and drying operations, then heat transfer efficiency is maintained, but particulate matter accumulates on the heat exchangers causing clogging and maintenance issues
Solution Approach 1:
The system segments the heat exchange function from the filtration function by introducing a separate particulate filtration mechanism (HEPA filter) that is distinct from the primary heat exchangers. This allows the heat exchangers to focus on heat transfer while particulate removal is handled by the dedicated filtration system, preventing accumulation and clogging on the heat exchange surfaces.
Solution Approach 2:
A third heat exchanger is introduced as an intermediary component that facilitates heat transfer between the refrigerant circuit and the process air without direct contact between the refrigerant and the particulate-laden air stream. This intermediary heat exchanger protects the primary heat exchangers from particulate contamination while maintaining efficient heat transfer.
2Adaptability or versatility
If the appliance switches between washing and drying modes using conventional heat exchanger configurations, then mode switching is achieved, but heat transfer efficiency decreases and maintenance frequency increases
Solution Approach 1:
The system employs dynamic configuration of the refrigerant circuit through reversible valves and flow control mechanisms that allow the refrigerant to be redirected between different heat exchangers based on the operational mode. During washing, the refrigerant flows through the first heat exchanger; during drying, it flows through the second and third heat exchangers, optimizing heat transfer efficiency for each mode without requiring physical reconfiguration.
3Object-affected harmful factors
If particulate filtration is integrated directly into the heat exchangers, then filtration is provided, but the heat exchanger surfaces become clogged requiring frequent maintenance
Solution Approach 1:
The system separates the filtration function from the heat exchange function by placing a HEPA filter in the airflow path upstream of the heat exchangers. This segmentation ensures that particulate matter is removed from the air before it reaches the heat exchanger surfaces, preventing clogging and reducing maintenance frequency while maintaining effective filtration.
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 solution enables efficient heat transfer and filtration, reducing maintenance needs by keeping particulate matter separate from primary heat exchangers, improving the appliance's operational efficiency and reducing the risk of clogging.
Implementation Method 1
A reversible refrigerant circuit directs a refrigerant between the first and second heat exchangers, the reversible refrigerant circuit having a flow control valve that further defines the drying and washing conditions of the reversible refrigerant circuit.
Implementation Method 2
The drying condition is further defined by the first heat exchanger being a heater for the process air
Implementation Method 3
the second heat exchanger being a cooling module for the fluid
Implementation Method 4
the fluid being selectively directed through the third heat exchanger to intersect with the process air
Data Source
AI summary
An appliance air/water handling system includes a rotating drum, airflow and fluid paths for directing process air and fluid, respectively, therethrough. First and second heat exchangers are in direct engagement with the airflow and fluid paths, respectively. A reversible refrigerant circuit delivers refrigerant through the first and second heat exchangers to alternatively define washing and drying conditions. In the washing condition the first heat exchanger cools the process air into cooled process air, and the second heat exchanger heats the fluid to define a heated fluid that is directed into the drum. In the drying condition the first heat exchanger heats the process air to define heated process air that is directed through the drum and through a third heat exchanger, and the second heat exchanger cools the fluid to define a cooled fluid that is directed to the third heat exchanger intersect with the heated process air.