Heat Pump Dryer Diagnostics for Evaporator Lint Buildup
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Solution Overview
Problem
Users face difficulty in accessing and diagnosing issues with the evaporator in clothes treating apparatuses equipped with heat pumps, as lint accumulation reduces heat transfer efficiency, and existing lint removal filters have limitations in mesh size and accessibility.
Innovation Solution
A diagnostic method that activates the compressor, measures refrigerant properties before and after a predetermined time, checks for changes in these properties to detect efficiency reductions, and notifies users to clean or replace the lint filter or evaporator, allowing for quick identification and resolution of foreign substance-related failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lint removal filter is provided at the upstream of the evaporator, then lint particle adhesion to the evaporator surface is minimized, but the filter mesh size cannot be reduced sufficiently and lint particles smaller than the mesh size still adhere to the evaporator
Solution Approach 1:
The diagnostic method performs preliminary detection of evaporator performance by measuring refrigerant temperature and pressure before failure occurs. By monitoring the temperature difference across the evaporator and comparing it to reference values, the system can identify lint accumulation issues early and prompt users to clean the evaporator, preventing heat transfer efficiency degradation before it becomes severe.
Solution Approach 2:
The patent replaces the mechanical approach of using finer filter meshes with a diagnostic system that uses temperature and pressure sensors to detect evaporator performance degradation. Instead of mechanically preventing all lint particles through ultra-fine filtration, the system substitutes a monitoring mechanism that detects when lint accumulation affects heat transfer, allowing for timely maintenance without requiring complex high-precision filters.
2Volume of moving object
If the evaporator is provided within the cabinet, then the heat pump system is compact, but users have difficulty accessing the evaporator for inspection and cleaning
Solution Approach 1:
The diagnostic system enables self-service monitoring by automatically detecting evaporator performance issues through refrigerant temperature and pressure measurements. The controller compares measured values against reference data and generates maintenance alerts without requiring user disassembly or inspection of the evaporator. This allows the evaporator to remain installed in the compact cabinet configuration while the system autonomously monitors its condition and prompts users for cleaning only when needed.
3Reliability
If foreign substances are accumulated on the evaporator surface, then heat transfer efficiency is reduced, but the reduction is difficult to detect without disassembling the dryer
Solution Approach 1:
The system implements feedback monitoring by continuously measuring refrigerant temperature at the evaporator inlet and outlet, calculating the temperature difference, and comparing it to reference values stored in memory. When the temperature difference exceeds the reference threshold, the controller generates a maintenance alert indicating lint accumulation. This feedback mechanism provides real-time information about evaporator performance without requiring physical inspection or disassembly of the dryer.
Solution Approach 2:
The patent uses refrigerant temperature and pressure as intermediary parameters to indirectly detect evaporator performance. Instead of directly observing lint accumulation on the evaporator surface, the system measures the thermal state of the refrigerant passing through the evaporator. The temperature difference and pressure readings serve as intermediaries that reflect the heat transfer efficiency, which is affected by lint accumulation, thereby enabling indirect detection without direct visual inspection.
4Reliability
If foreign substances are filtered by the lint removal filter, then lint particles are captured, but the filtered substances remain on the filter surface and prevent air flow
Solution Approach 1:
The diagnostic system performs preliminary detection of evaporator performance degradation before it severely impacts air flow and system productivity. By monitoring refrigerant temperature and pressure continuously, the system can identify when lint accumulation begins to affect heat transfer efficiency and prompt users to clean the evaporator proactively, preventing the condition from progressing to the point where air flow is significantly restricted.
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 method enables quick and accurate diagnosis of heat pump system failures due to lint or evaporator issues, preventing adverse effects on heat transfer efficiency and enhancing product reliability by guiding users to address problems promptly.
Implementation Method 1
activating the compressor; measuring a property (P1) of the refrigerant that has passed through the compressor
Implementation Method 2
high-temperature air being discharged from the drum may be cooled and condensed by exchanging heat with the evaporator
Implementation Method 3
high-temperature air being discharged from the drum may be cooled and condensed by exchanging heat with the evaporator
Implementation Method 4
air being supplied to the drum is heat exchanged with the condenser to generate hot air
Data Source
AI summary
The present invention relates to a diagnostic method for a clothes treating apparatus, and according to an aspect of the present disclosure, there is provided a diagnostic method of a clothes treating apparatus having a compressor, a condenser, an expansion apparatus, and an evaporator for cooling air being discharged from a drum by the evaporator a heat pump, and the method may include activating the compressor; measuring a property (P1) of the refrigerant that has passed through the compressor; re-measuring a property (P2) of the refrigerant that has passed through the compressor after a predetermined period of time has passed; checking whether or not a value F that is defined as P2−P1 is equal to or greater than a predetermined value; suspending the operation of the compressor and repeating the foregoing processes when the value F is less than the predetermined value; and determining that a failure has occurred in the clothes treating apparatus when the execution number of the processes is equal to or greater than the predetermined value.