Refrigerator Damper Control for Dual-Compartment Temperature Switching
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Solution Overview
Problem
Conventional refrigerators face challenges in efficiently controlling and maintaining different temperature settings across multiple storage compartments, leading to inefficiencies in cooling and warming cycles, particularly when switching between low-temperature and high-temperature modes.
Innovation Solution
The implementation of a refrigerator system with a cooling system that includes an evaporator, defrosting heater, and dampers to control air supply, where the compressor, condenser, and blowing fan are strategically managed by a controller to prioritize temperature regulation in separate compartments, introducing delays for efficient switching and operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the cooling system is switched from cooling to warming mode, then the high-temperature storage compartment can be heated, but the system efficiency decreases due to the switching delay and energy loss
Solution Approach 1:
The system performs preliminary actions by pre-heating the high-temperature storage compartment using the evaporator before the actual warming mode is needed. The controller activates the evaporator in advance to raise the temperature of the high-temperature compartment, so when warming mode is required, the transition is faster and more efficient, reducing energy loss during switching.
2Reliability
If the cooling system operates continuously to maintain low-temperature storage, then the low-temperature storage compartment remains cold, but the high-temperature storage compartment cannot be heated simultaneously
Solution Approach 1:
The system segments the temperature control functions by using separate dampers (first damper for low-temperature storage, second damper for high-temperature storage) to independently control air flow to different compartments. The controller can selectively activate cooling for the low-temperature compartment while simultaneously enabling warming for the high-temperature compartment, allowing multi-compartment temperature control to occur in parallel without interference.
Solution Approach 2:
The evaporator and cooling system are designed to serve multiple functions: they can cool the low-temperature storage compartment during cooling mode, and they can also heat the high-temperature storage compartment during warming mode by controlling the direction of air flow through the dampers. This multi-functionality allows a single cooling system to regulate temperatures in separate storage compartments differently.
3Adaptability or versatility
If the system switches between cooling and warming modes frequently, then both storage compartments can be temperature-regulated, but the system stability decreases due to frequent cycling
Solution Approach 1:
The system performs preliminary temperature adjustments before mode switching is actually needed. The controller monitors temperature trends and activates the evaporator in advance to pre-cool or pre-heat compartments, so that when mode switching occurs, the system is already closer to the target state, reducing the frequency and impact of cycling.
4Productivity
If the evaporator is used for cooling, then the low-temperature storage compartment is cooled efficiently, but frost accumulates on the evaporator requiring defrosting interruptions
Solution Approach 1:
The system converts the harmful effect of frost accumulation into a beneficial opportunity. When frost builds up on the evaporator during cooling operation, the system switches to warming mode and uses the evaporator to heat the high-temperature storage compartment. This simultaneous defrosting process eliminates the need for separate defrosting cycles, turning the frost problem into a useful heating function.
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 allows for precise temperature control in both low-temperature and high-temperature compartments, improving system efficiency by optimizing the use of cooling and warming cycles, and ensuring stable operation by prioritizing cooling over warming.
Implementation Method 1
an evaporator, which may accumulate frost during a cooling cycle
Implementation Method 2
a defrosting heater provided at the evaporator. The evaporator may be used to cool a first storage compartment, and the defrosting heater may additionally be used to warm a second storage compartment
Implementation Method 3
an evaporator, blowing fan, and defrosting heater installed in one of the storage compartments
Data Source
AI summary
A refrigerator includes a low-temperature storage compartment damper to control supply of cool air to a low-temperature storage compartment, a high-temperature storage compartment damper to control supply of hot air to a high-temperature storage compartment, and a controller to control the low-temperature storage compartment damper to be opened and the high-temperature storage compartment damper to be closed while controlling a compressor and blowing fan to be driven so that the temperature of the low-temperature storage compartment reaches a low set temperature, to control the driving of the compressor and blowing fan to be stopped and the low-temperature storage compartment damper to be closed when the temperature of the low-temperature storage compartment reaches the low set temperature, and to control a defrosting heater and the blowing fan to be driven and the high-temperature storage compartment damper to be opened when the supply of cool air is stopped.