Removal of an accumulated frozen substance from a cooling unit
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Solution Overview
Problem
Conventional defrost detection methods in cooling units are unreliable, leading to unnecessary or insufficient defrost cycles, which reduce energy efficiency and increase energy consumption.
Innovation Solution
A probe system with a capacitance sensor and temperature sensor, mounted to detect frost accumulation on cooling fins, providing accurate threshold-based initiation and termination of defrost cycles, thereby optimizing defrost operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional defrost detection methods are used, then the cooling unit operates continuously, but the defrost cycles are unnecessary or insufficient, reducing energy efficiency
Solution Approach 1:
The patent replaces conventional mechanical or simple thermal defrost detection methods with a capacitance-based sensing system. The capacitance sensor detects changes in the dielectric properties of the air-frost interface, providing reliable detection of frost accumulation without mechanical contact. This substitution enables accurate defrost timing, eliminating unnecessary defrost cycles and improving energy efficiency.
Solution Approach 2:
The invention monitors changes in capacitance parameters as frost accumulates on the cooling fins. By detecting the dielectric constant changes in the air-frost system, the sensor provides precise measurement of frost thickness and density. This parameter-based detection allows the control system to initiate defrost cycles at optimal moments, avoiding energy waste from premature or delayed defrosting.
2Reliability
If defrost cycles are performed frequently, then frost accumulation is controlled, but energy consumption increases due to unnecessary cycles
Solution Approach 1:
The capacitance sensor provides continuous feedback on frost accumulation levels to the control system. This feedback mechanism allows the system to adjust defrost cycle timing based on actual frost conditions rather than operating on fixed schedules. The control system uses the capacitance measurements to determine when defrost cycles are truly necessary, reducing energy consumption from unnecessary defrost operations while maintaining effective frost control.
Solution Approach 2:
The system performs defrost cycles only to the extent necessary based on actual frost accumulation levels. By using capacitance detection to identify the precise moment when frost reaches critical thresholds, the system avoids excessive defrosting operations. This partial action approach ensures frost control effectiveness while minimizing energy waste from over-defrosting.
3Measurement precision
If a probe with sensor and support is used, then accurate frost thickness detection is achieved, but device complexity increases
Solution Approach 1:
The invention extracts the sensing function from complex multi-sensor assemblies and implements it through a single capacitance sensor mounted on a simple support structure. The capacitance sensor alone provides sufficient measurement precision for frost thickness detection by exploiting dielectric property changes. This extraction simplifies the overall probe system while maintaining accurate measurement capabilities.
Solution Approach 2:
The capacitance sensor serves multiple functions simultaneously: it detects frost thickness, determines frost density, and provides timing information for defrost cycle initiation. This multi-functionality eliminates the need for separate sensors for each measurement parameter, reducing device complexity while maintaining comprehensive monitoring capabilities.
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 ensures defrost cycles are initiated only when necessary, enhancing cooling and energy efficiencies, reducing energy consumption, and minimizing unnecessary cycles, resulting in significant energy savings and reduced carbon emissions.
Implementation Method 1
the sensor is operable to provide an indication of a thickness of a frozen substance that has accumulated between the sensor and a cooling fin
Implementation Method 2
A probe system with a capacitance sensor and temperature sensor, mounted to detect frost accumulation on cooling fins
Data Source
AI summary
A probe includes a sensor and a support. The sensor is operable to provide an indication of a thickness of a frozen substance that has accumulated between the sensor and a cooling fin of a cooling unit, and the support is operable to hold the sensor spaced apart from the cooling fin. When a defrost controller uses such a probe to monitor an amount of frost build up on the fin or fins of a cooling unit (e.g., a refrigeration unit or freezer unit), the defrost controller can initiate a defrost cycle only when warranted, e.g., only when the thickness of the built-up frost equals or exceeds a threshold thickness.