Refrigerator Frost Detection Cycle Control to Reduce Power Consumption
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Solution Overview
Problem
Conventional refrigerator defrosting operations are inefficient due to indirect frost detection methods, leading to unnecessary power consumption and potential loss of cooling capability, with frequent and inaccurate frost detection operations causing additional energy waste and spoilage of stored items.
Innovation Solution
A frost detection operation control method that adjusts performance cycles based on temperature differences, allowing for accurate detection of frost formation and minimizing unnecessary operations, thereby reducing power consumption and maintaining cooling capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If defrosting operation is performed based on indirect estimation through operation time, then the control system is simple, but power consumption efficiency decreases due to unnecessary or insufficient defrosting
Solution Approach 1:
The patent replaces indirect time-based estimation with direct physical measurement using temperature sensors and pressure difference measurements. Temperature sensors detect temperature differences between evaporator inlet and outlet, while pressure sensors measure pressure differences across the evaporator, providing direct physical indicators of frost formation rather than relying on temporal estimation.
Solution Approach 2:
The system continuously monitors temperature and pressure parameters and uses this feedback to dynamically control the defrosting operation. The controller adjusts defrosting timing and duration based on real-time detection of frost conditions, creating a closed-loop control system that responds to actual system state rather than following a predetermined schedule.
2Measurement precision
If frost detection operation is performed frequently to accurately determine frost formation, then measurement precision improves, but power consumption increases due to repeated heating element activation
Solution Approach 1:
The patent implements dynamic adjustment of detection frequency based on operating conditions. The system performs frost detection operations at varying intervals depending on refrigerator operation status, ambient temperature, and humidity levels, rather than using fixed periodic detection. This dynamic approach maintains detection accuracy while minimizing unnecessary detection operations.
Solution Approach 2:
The system changes detection parameters such as temperature thresholds and pressure difference thresholds based on operating conditions. The controller adjusts the sensitivity and frequency of frost detection according to ambient temperature, humidity, and refrigerator operation mode, optimizing the balance between detection accuracy and energy consumption.
3Reliability
If defrosting operation is performed repeatedly to ensure complete frost removal, then reliability of frost removal improves, but cooling capability is lost and stored items may melt or spoil
Solution Approach 1:
The system performs preliminary frost detection and assessment before initiating defrosting operation. By detecting frost accumulation early and estimating the required defrosting duration based on detected frost levels, the system prepares appropriate defrosting parameters in advance, ensuring complete frost removal while minimizing unnecessary prolonged defrosting that would cause cooling capability loss.
Solution Approach 2:
The patent applies partial defrosting when sufficient, rather than always performing complete or excessive defrosting operations. The controller assesses the actual frost condition and applies defrosting heat only to the extent necessary to remove the detected frost layer, avoiding excessive heating that would unnecessarily compromise cooling capability and cause stored items to melt.
4Measurement precision
If temperature difference method is used to detect frost amount, then measurement precision improves, but device complexity increases due to additional sensors and measurement systems
Solution Approach 1:
The patent makes existing temperature sensors and pressure sensors serve multiple functions. Temperature sensors originally intended for general temperature monitoring are also used for frost detection by measuring temperature differences across the evaporator. Pressure sensors used for refrigeration cycle control are simultaneously employed to detect pressure differences indicating frost accumulation, eliminating the need for dedicated frost detection sensors.
Solution Approach 2:
The system merges frost detection functionality with existing temperature and pressure measurement systems. Rather than adding separate dedicated frost detection hardware, the patent combines multiple measurement functions into a unified control system that uses the same sensors for both routine operation monitoring and frost detection, reducing overall system complexity.
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 method improves power consumption efficiency by optimizing frost detection cycles and preventing cooling capability loss, ensuring accurate defrosting operations are performed when needed, thus preserving the integrity of stored items.
Implementation Method 1
the heating element generates heat so as to heat the inside of the guide flow path
Implementation Method 2
the evaporator serves to maintain air inside the refrigerator within a preset temperature range by exchanging heat between a low-temperature and low-pressure refrigerant and the air inside the refrigerator
Implementation Method 3
frost may be formed on the evaporator due to at least one of water or moisture contained in the internal air
Data Source
AI summary
A refrigerator in which a performance cycle for a next frost detection operation according to a logic temperature (ΔHt) checked through a frost detection operation may be changed. Thus, unnecessary power consumption may be reduced and power consumption efficiency may be improved.