Refrigerator Cycle-Transition Fan Control to Reduce Power Consumption
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Solution Overview
Problem
In refrigerators with both freezing and refrigerating compartments, the continuous operation of fans after cycle transitions leads to increased power consumption due to reduced heat exchange efficiency and unnecessary cooling, as the temperature difference between the compartments and their evaporators decreases.
Innovation Solution
Implementing a control method that adjusts the output of the refrigerating compartment fan stepwise during the freezing cycle, reducing its power consumption by decreasing the fan output based on temperature changes and elapsed time, and maintaining the compressor operation without stopping it during transitions between cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the freezing compartment fan is operated continuously after the freezing cycle is stopped, then cooling of the freezing compartment is maintained for a predetermined time, but unnecessary power consumption is caused due to reduced heat exchange efficiency
Solution Approach 1:
The fan output is dynamically adjusted based on the temperature difference between the freezing compartment and the evaporator. When the temperature difference is large, the fan operates at high output to maintain cooling efficiency. When the temperature difference decreases, the fan output is reduced or stopped to save energy, thus resolving the contradiction between maintaining cooling and reducing power consumption
Solution Approach 2:
The control method changes the fan operation parameters (output level) based on real-time temperature conditions. By monitoring the temperature difference and adjusting the fan output accordingly, the system optimizes energy consumption while ensuring cooling is maintained when necessary
2Temperature
If the freezing compartment fan output is maintained at previous level after freezing cycle stops, then cooling effect is sustained, but heat exchange efficiency decreases due to temperature rise of evaporator
Solution Approach 1:
The system uses feedback control by continuously monitoring the temperature difference between the freezing compartment and the evaporator. Based on this feedback, the controller adjusts the fan output to maintain optimal heat exchange efficiency while sustaining the cooling effect when needed
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 approach reduces power consumption by optimizing fan output according to temperature changes and elapsed time, maintaining efficient cooling while minimizing unnecessary energy use during cycle transitions.
Implementation Method 1
air is cooled by latent heat of evaporation of the freezing compartment evaporator
Implementation Method 2
a refrigerating compartment fan for moving air over the refrigerating compartment evaporator
Implementation Method 3
a refrigerating compartment evaporator for cooling the refrigerating compartment when a refrigerating cycle is operated
Data Source
AI summary
A method of controlling a refrigerator may include operating a first cooling cycle for a first storage compartment to drive a compressor and operating a first cooling fan for cooling the first storage compartment, and switching to a second cooling cycle for cooling a second storage compartment to drive the compressor and operating a second cooling fan for cooling the second storage compartment when a stop condition of the first cooling cycle is satisfied. The method may also include switching to a third cooling cycle for cooling the first storage compartment to drive the compressor and operating the first cooling fan when a stop condition of the second cooling cycle is satisfied.