Refrigerator Fan Control for Fresh Food Temperature Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In no-frost refrigerators with two compartments, high temperature fluctuations occur in the fresh food compartment due to the intermittent operation of the evaporator fan, leading to adverse effects on food quality.
Innovation Solution
A cooling device with a control unit that regulates the operation of the compressor and fans in both compartments, ensuring the fresh food compartment fan operates with the freezer compartment fan when temperatures exceed a certain threshold, and stops the fresh food compartment fan when temperatures reach a second threshold, thereby reducing temperature fluctuations and optimizing energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the evaporator fan operates at long intervals to save energy, then energy consumption is reduced, but temperature fluctuations increase in the fresh food compartment
Solution Approach 1:
The patent implements dynamic fan control by introducing multiple threshold temperatures (first threshold, second threshold, third threshold) that adaptively adjust fan operation parameters. The control unit dynamically modifies fan speed and operation timing based on real-time temperature readings, enabling the system to respond flexibly to changing thermal conditions rather than operating at fixed intervals.
Solution Approach 2:
The patent applies beforehand cushioning by activating the evaporator fan in advance when the temperature reaches the first threshold temperature, before the temperature can rise to problematic levels. This preemptive action creates a thermal buffer that prevents excessive temperature fluctuations, ensuring smoother temperature transitions in the fresh food compartment.
2Temperature
If the fresh food compartment fan operates continuously to maintain stable temperature, then temperature fluctuations are reduced, but energy consumption increases
Solution Approach 1:
The patent implements periodic action through multi-threshold temperature control, where the fan operates in controlled cycles rather than continuously. The fan activates when temperature reaches the first threshold and deactivates at the second threshold, creating regular operational periods that maintain temperature stability while avoiding continuous operation and associated energy waste.
Solution Approach 2:
The patent changes operational parameters by introducing multiple temperature thresholds (first, second, third thresholds) that modify the fan's operation characteristics. Instead of binary on/off control, the system adjusts fan speed and timing based on which threshold is reached, enabling fine-grained control over both temperature stability and energy consumption.
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 effectively reduces temperature fluctuations in the fresh food compartment, improving food storage conditions and maintaining stable temperatures, which enhances food quality and reduces energy consumption.
Implementation Method 1
an evaporator for cooling the compartments by providing heat transfer between a refrigerant fluid and an environment
Implementation Method 2
a fan that blows the cold air generated by the evaporator into the compartments
Data Source
Figure 1
Figure 2~5
Figure 6
AI summary
By means of the present invention, the storage conditions of the foods stored in the fresh food compartment (2) are improved and hence, they are provided to last for a longer period of time by decreasing the temperature fluctuations inside the fresh food compartment (2).