Cascade Refrigeration Loops With Shared Return Header
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Solution Overview
Problem
Existing refrigeration systems face inefficiencies in managing temperature variations across different storage devices, requiring separate cooling systems and complex configurations to maintain optimal temperatures in both low and medium temperature settings.
Innovation Solution
A refrigeration system with a primary loop and secondary loops operably coupled by a chiller, where the secondary loops share a common return header and utilize liquid coolant to pre-cool and distribute cooling efficiently across low and medium temperature storage devices, eliminating the need for separate cooling systems and enhancing energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If separate cooling systems are used for low and medium temperature storage devices, then each temperature zone can be optimized independently, but the system complexity and number of components increases
Solution Approach 1:
The patent combines separate cooling systems into a unified cascade system where a single refrigerant loop serves both low and medium temperature storage devices through strategic placement of expansion devices and heat exchangers, reducing overall system complexity while maintaining independent temperature control capability
Solution Approach 2:
The refrigerant loop is designed to perform multiple functions simultaneously - cooling both low and medium temperature storage devices through different expansion devices, eliminating the need for separate dedicated cooling systems and reducing component count
2Temperature
If separate cooling systems are used for low and medium temperature storage devices, then each system can be optimized for its specific temperature range, but the overall system size and component quantity increases
Solution Approach 1:
Multiple cooling functions are merged into a single integrated refrigerant loop that serves both low and medium temperature storage devices, significantly reducing the total quantity of components such as compressors, condensers, and expansion devices while maintaining optimized temperature control
Solution Approach 2:
The unified refrigerant loop is designed to perform multiple cooling functions simultaneously for different temperature zones, eliminating redundant components and reducing overall system component quantity while preserving temperature-specific optimization
3Device complexity
If a unified cooling system is used for both low and medium temperature storage devices, then the system complexity is reduced, but temperature control precision for each zone may be compromised
Solution Approach 1:
The unified refrigerant loop is segmented into distinct control zones with separate expansion devices - a first expansion device for low temperature storage and a second expansion device for medium temperature storage - allowing independent temperature control precision within each zone while maintaining overall system simplicity
Solution Approach 2:
Different sections of the unified system are designed with locally optimized characteristics - specific heat exchangers and expansion devices are positioned and configured to provide appropriate temperature control precision for each temperature zone (low vs. medium) without requiring completely separate systems
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 configuration allows for efficient cooling distribution across varying temperature devices, reduces energy consumption, and simplifies the system by sharing coolant resources, thereby improving overall thermal management and operational efficiency.
Implementation Method 1
a chiller, where the primary loop circulates refrigerant through the chiller to provide cooling to a coolant in the secondary loop
Data Source
AI summary
A refrigeration system includes a first portion having a primary loop and a secondary loop operably coupled by a first chiller, The primary loop circulates a refrigerant through the first chiller to provide cooling to a coolant in the secondary loop. The secondary loop has a supply portion and a return portion, the supply portion circulates the coolant to one or more temperature-controlled storage devices operating at a first temperature. A second portion has a primary loop and at least one secondary loop operably coupled by the second chiller. The primary loop circulates a refrigerant through the second chiller to provide cooling to coolant in the secondary loop. The secondary loop has a supply portion and a return portion, the supply portion circulates the coolant to one or more temperature-controlled storage devices operating at a second temperature. The return portion of the secondary loop of the first portion and the return portion of the secondary loop of the second portion share a common return header.