Condensation mitigation method for a refrigerator appliance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Refrigerator appliances face challenges in maximizing internal capacity while minimizing condensation on external surfaces due to space limitations and existing condensation mitigation methods being complex, costly, and ineffective.
Innovation Solution
A refrigerator appliance equipped with a sealed system and ambient humidity sensor that adjusts the chamber temperature based on ambient humidity to prevent condensation by maintaining a target temperature higher than the standard operating temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If minimum insulation thickness is used to prevent condensation, then condensation is reduced, but internal capacity is limited
Solution Approach 1:
The system dynamically changes the operating temperature parameter of the refrigerated space based on ambient humidity conditions. When condensation risk is detected through humidity sensing, the system adjusts the temperature setpoint to prevent the external surface temperature from dropping below the dew point, thereby eliminating condensation without requiring additional insulation thickness that would reduce internal capacity.
Solution Approach 2:
The patent implements a feedback control system using ambient humidity sensors to monitor conditions that lead to condensation. The controller receives humidity data and adjusts the refrigeration system operation accordingly, creating a closed-loop system that responds to actual environmental conditions rather than relying on fixed insulation design margins.
2Object-affected harmful factors
If electrical heater is used to mitigate condensation, then condensation is prevented, but energy consumption increases
Solution Approach 1:
The system uses the refrigeration system's own operational adjustments to prevent condensation rather than requiring separate heating elements. By modulating the refrigeration cycle and adjusting temperature setpoints based on humidity feedback, the system prevents condensation through its primary cooling function, eliminating the need for additional energy-consuming heating components.
Solution Approach 2:
Instead of adding energy through electrical heaters, the system changes the temperature parameter of the refrigerated space dynamically. When condensation risk is detected, the system raises the temperature setpoint temporarily to keep external surfaces above the dew point, using minimal additional energy compared to continuous heating approaches.
3Object-affected harmful factors
If thermal shunts or hot gas loop are used to prevent condensation, then condensation is mitigated, but device complexity increases
Solution Approach 1:
The patent makes the refrigeration system perform multiple functions: its primary cooling function plus a secondary condensation prevention function through dynamic temperature adjustment. The same compressor, condenser, and evaporator system that provides refrigeration also prevents condensation by adjusting operating parameters, eliminating the need for separate thermal shunts or hot gas loop systems.
Solution Approach 2:
The system uses simple humidity sensing feedback to control the refrigeration system, avoiding complex additional hardware. The controller monitors ambient humidity and adjusts the temperature setpoint accordingly, creating an intelligent but simple control approach that doesn't require elaborate thermal management add-ons.
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
Effectively reduces condensation on external surfaces by dynamically adjusting the internal temperature to prevent sweat formation, optimizing internal capacity without complex or costly solutions.
Implementation Method 1
an ambient humidity sensor
Implementation Method 2
a minimum insulation thickness may be needed to prevent such condensation
Implementation Method 3
maintaining the chilled chamber at the standard operating temperature will produce sweat on an outer surface of the refrigerator appliance
Data Source
AI summary
A refrigerator appliance includes a cabinet defining a chilled chamber, a sealed system for regulating a chamber temperature within the chilled chamber, and an ambient humidity sensor. A controller is configured to operate the sealed system to regulate the chamber temperature to a standard operating temperature, obtain an ambient humidity using the ambient humidity sensor, determine, based on the ambient humidity, that maintaining the chilled chamber at the standard operating temperature will produce sweat on an outer surface of the refrigerator appliance, determine a target temperature higher than the standard operating temperature that prevents the sweat from being produced on the outer surface of the refrigerator appliance, and operate the sealed system to regulate the chamber temperature to the target temperature.