Dual-Evaporator Refrigeration Pulldown Mode for Faster Cooling
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Solution Overview
Problem
Existing refrigeration systems in appliances face inefficiencies in pulldown mode, where rapid temperature reduction is needed, often resulting in increased costs and software complexity due to inadequate compartment management.
Innovation Solution
A refrigeration system with a controller that uses two evaporators and a valve to prioritize cooling in one compartment initially, then switches to cooling both compartments, based on temperature sensors, to optimize pulldown performance and exit the mode when both compartments reach set temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If refrigerant is distributed to both evaporators simultaneously during pulldown mode, then both compartments cool down, but the pulldown performance is slower and energy efficiency is reduced
Solution Approach 1:
The pulldown mode is segmented into distinct phases: initially directing refrigerant flow to only the second evaporator for rapid cooling, then switching to dual evaporator operation when temperature thresholds are met. This segmentation allows optimized cooling performance at different stages of the pulldown process.
Solution Approach 2:
The system dynamically adjusts refrigerant flow distribution based on real-time temperature feedback from both compartments. The valve transitions between positions based on temperature thresholds, creating a dynamic response that optimizes both cooling speed and energy efficiency throughout the pulldown process.
2Adaptability or versatility
If a complex control system with multiple valves is used to manage refrigerant flow to both evaporators independently, then compartment management is optimized, but device complexity and costs increase
Solution Approach 1:
The single valve performs multiple functions by transitioning between positions: it can direct refrigerant to the second evaporator only, to both evaporators, or control flow distribution dynamically. This multi-functionality achieves optimized compartment management without requiring separate control valves for each evaporator.
Solution Approach 2:
The control system uses temperature feedback from both compartments to automatically determine when to switch valve positions and adjust refrigerant flow distribution. The system self-regulates based on temperature thresholds, eliminating the need for complex manual control or additional control components.
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 enables faster pulldown performance, better compartment management, reduced costs, and simplified software complexity by prioritizing cooling and adjusting refrigerant flow dynamically.
Implementation Method 1
a first evaporator in the first compartment and a second evaporator in the second compartment
Implementation Method 2
refrigerant flows directly to a second evaporator
Data Source
AI summary
An appliance includes a first compartment and a second compartment. A temperature of the first compartment is determined with a first temperature sensor, and a temperature of the second compartment is determined with a second temperature sensor. If the temperature of the first compartment is above a first predetermined value and the temperature of the second compartment is above a second predetermined value, a controller causes the appliance to enter a pulldown mode. Upon entering the pulldown mode, the controller causes a valve to enter a first position where refrigerant flows to a freezer evaporator and is prevented from flowing to a fresh food evaporator.