Refrigerator cooling system having a secondary cooling loop
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Solution Overview
Problem
Prior refrigeration systems face challenges in efficiently managing surplus cooling capacity, leading to unwanted temperature fluctuations in compartments with different thermal demands, as excess cooling capacity from one evaporator cannot be consistently operated at a desired temperature.
Innovation Solution
A dual evaporator cooling system with a secondary cooling loop and a controller that manages coolant flow through a series and parallel configuration, utilizing a three-way valve and throttling devices to distribute coolant effectively between compartments, and a secondary cooling loop with a pump and heat exchangers to utilize excess cooling capacity, allowing for independent temperature control of fresh food and freezer compartments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single evaporator is used to cool multiple compartments, then the system is simpler, but temperature control precision deteriorates due to inability to independently manage different thermal demands
Solution Approach 1:
The cooling system is segmented into multiple independent evaporators (first evaporator for fresh food compartment, second evaporator for freezer compartment), each capable of independent operation and temperature control, thereby resolving the contradiction between system simplicity and temperature control precision
Solution Approach 2:
Each evaporator is designed with local quality tailored to its specific compartment's thermal demands, with the first evaporator optimized for fresh food compartment conditions and the second evaporator optimized for freezer compartment conditions, enabling precise temperature control in each zone
2Productivity
If evaporator operates at high capacity, then cooling performance is improved, but temperature stability deteriorates due to surplus cooling capacity causing fluctuations
Solution Approach 1:
The system dynamically adjusts evaporator operation by selectively activating only the required evaporator based on real-time thermal demands of different compartments, preventing surplus cooling capacity and maintaining temperature stability while preserving cooling performance when needed
Solution Approach 2:
The controller changes operational parameters by selectively controlling which evaporator operates and at what capacity, matching the cooling output to the actual thermal demand of each compartment, thereby maintaining both cooling performance and temperature stability
3Adaptability or versatility
If coolant is distributed to both compartments simultaneously, then cooling coverage is improved, but energy efficiency deteriorates due to inability to manage excess cooling
Solution Approach 1:
The system dynamically distributes coolant based on real-time thermal demands of different compartments, selectively routing coolant to only the compartments that require cooling at any given time, thereby improving energy efficiency while maintaining flexible cooling distribution capability
Solution Approach 2:
Coolant distribution is optimized with local quality by providing different cooling rates and temperatures to different compartments based on their specific thermal demands, with the first evaporator serving the fresh food compartment and the second evaporator serving the freezer compartment, reducing energy waste from excessive cooling
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 enables consistent operation of evaporators at desired temperatures, reduces energy usage by managing excess cooling, and provides efficient thermal regulation by selectively distributing cooling resources, making the system 'Smart Grid friendly' and space-efficient.
Implementation Method 1
an evaporator that provides cooling to at least one of the compartments
Implementation Method 2
a compressor that compresses the coolant
Implementation Method 3
a condenser that receives the coolant from the compressor
Data Source
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AI summary
A refrigerator cooling system and method provides cooling to one or more features of a refrigerator by employing a secondary cooling loop that utilizes the excess cooling capacity of an evaporator to selectively provide supplemental cooling to the features when a thermal demand arises.