Vehicle Liquid-Cooled Refrigerator With Cascade Thermoelectric Cooling
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Solution Overview
Problem
Conventional aircraft galley refrigerators rely on energy-intensive vapor-compression refrigeration systems, which are prone to malfunction, heavy, and occupy significant space, limiting their efficiency and reliability.
Innovation Solution
A refrigeration system that connects to a vehicle's liquid cooling system, utilizing a chilled liquid coolant system and a thermoelectric cooling system in a cascade configuration to maintain precise temperature control, reducing the need for mechanical components and air flow, thereby minimizing weight, energy consumption, and increasing reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a vapor-compression refrigeration system is used, then cooling function is achieved, but energy consumption increases significantly
Solution Approach 1:
The patent replaces the mechanical vapor-compression system with a thermoelectric cooling system that uses electrical current directly to create a temperature differential through the Peltier effect, eliminating the need for mechanical compressors and refrigerant cycles
Solution Approach 2:
The patent changes the fundamental operating parameter from mechanical compression of vapor to direct electrical current application across thermoelectric materials, fundamentally altering how cooling is achieved and reducing energy consumption
2Temperature
If a vapor-compression refrigeration system is used, then cooling function is achieved, but device complexity increases
Solution Approach 1:
The patent extracts and removes the complex mechanical components (compressor, condenser, expansion valve, evaporator) from the system, retaining only the essential thermoelectric modules and control electronics, thereby dramatically simplifying the overall system architecture
Solution Approach 2:
The patent substitutes mechanical moving parts with solid-state thermoelectric devices, eliminating the need for seals, bearings, and complex refrigerant distribution systems, resulting in a much simpler and more reliable system
3Temperature
If a vapor-compression refrigeration system is used, then cooling function is achieved, but weight increases
Solution Approach 1:
The patent removes heavy mechanical components such as the compressor motor, condenser coils, and refrigerant storage, retaining only lightweight thermoelectric modules and insulation, thereby significantly reducing overall system weight
Solution Approach 2:
The patent transitions from a heavy mechanical system requiring substantial structural support to a lightweight solid-state system that can be mounted with minimal infrastructure, fundamentally changing the weight characteristics of the refrigeration unit
4Temperature
If a vapor-compression refrigeration system is used, then cooling function is achieved, but occupied space increases
Solution Approach 1:
The patent employs compact thermoelectric modules that can be nested within the refrigerator cavity itself, with cooling plates directly contacting the interior walls, thereby eliminating the need for separate mechanical compartments and reducing overall system volume
Solution Approach 2:
The patent removes the bulky external condenser and compressor housing, integrating all cooling functions into the internal volume of the refrigerator, thereby maximizing usable space and minimizing the footprint of the unit
5Temperature
If a vapor-compression refrigeration system is used, then cooling function is achieved, but reliability decreases
Solution Approach 1:
The patent replaces mechanical systems with moving parts that are subject to wear and failure with solid-state thermoelectric devices that have no moving parts, eliminating the primary sources of mechanical failure and significantly improving system reliability
Solution Approach 2:
The patent uses simple, solid-state thermoelectric modules that can be easily replaced if needed, rather than complex mechanical systems that require extensive repair, improving reliability through simplicity and ease of replacement
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
The system achieves efficient temperature control with reduced energy usage and weight, enhanced reliability, and simplified maintenance, while eliminating the need for air ducts and mechanical components, resulting in a more compact and cost-effective refrigeration solution.
Implementation Method 1
a heat exchanger operationally coupled with the chilled liquid coolant system and the compartment to transfer heat from the compartment into the liquid coolant
Implementation Method 2
a cascade thermoelectric device cooling system design for a vehicle three-mode refrigerator
Data Source
AI summary
An exemplary refrigeration system for cooling food or beverages may use a liquid cooling system of a vehicle. The refrigeration system may include a compartment in which the food or beverages may be placed and removed, a chilled liquid coolant system having a connection through which liquid coolant is received from the liquid cooling system of the vehicle, and a heat exchanger operationally coupled with the chilled liquid coolant system and the compartment to transfer heat from the compartment into the liquid coolant. The refrigeration system may also include a second chilled coolant system through which a second coolant flows and a second heat exchanger operationally coupled with the second chilled coolant system and the compartment to transfer heat from the compartment. The chilled liquid coolant system and the second chilled coolant system may operate together as a cascade cooling system.