Vehicle Cabin Conditioning with Radiative Heat Rejection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing environmental control systems for vehicles, such as stratospheric balloons, face challenges in efficiently rejecting heat and maintaining cabin conditions due to low atmospheric pressure and temperature extremes, which limit the effectiveness of conventional heat rejection methods like convection and sublimation/flash evaporation, and result in inadequate thermal management and humidity control.
Innovation Solution
The system employs phase-change techniques like water pervaporation and radiator-based heat rejection, combined with a heat pump to increase the temperature of the working fluid, enhancing heat rejection capabilities across various altitudes, and includes a refrigerant loop for thermal management and humidity control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional heat rejection methods (convection and sublimation/flash evaporation) are used in stratospheric balloons, then the system is simple and easy to operate, but heat rejection effectiveness deteriorates due to low atmospheric pressure and temperature extremes
Solution Approach 1:
The patent changes the physical parameters of heat rejection by transitioning from convection-based methods to radiation-based methods. The radiator system operates in the infrared spectrum, emitting thermal radiation directly to space, which allows effective heat rejection in the low-pressure stratospheric environment where conventional convection fails. This parameter change enables the system to adapt to extreme environmental conditions.
Solution Approach 2:
The patent replaces mechanical heat rejection methods (convection requiring atmospheric molecules, sublimation requiring specific temperature-pressure conditions) with a radiative heat rejection system. The radiator converts thermal energy directly into electromagnetic radiation, eliminating dependence on atmospheric pressure and temperature conditions, thus solving the adaptability problem.
2Loss of energy
If phase-change techniques and heat pumps are used to enhance heat rejection, then thermal management effectiveness is improved, but system complexity and weight increase
Solution Approach 1:
The patent utilizes phase transitions of the refrigerant in the heat pump system to achieve efficient heat transfer. The refrigerant cycles between liquid and vapor phases, absorbing and releasing latent heat, which enhances the thermal management effectiveness. This phase-change mechanism allows the system to handle varying thermal loads efficiently.
Solution Approach 2:
The patent integrates multiple functions into a unified thermal management system. The heat pump system serves both as a heat rejection mechanism and as a temperature regulation system, while the radiator simultaneously rejects heat from both the cabin environment and the heat pump condenser. This multi-functionality reduces overall system complexity despite the advanced capabilities.
3Reliability
If a comprehensive thermal management system with heat pump and radiator is implemented, then cabin conditioning effectiveness is improved, but system weight increases
Solution Approach 1:
The patent merges the heat rejection function with the thermal management function by integrating the radiator system with the heat pump. The same radiator structure rejects heat from both the cabin air conditioning cycle and the heat pump condenser, eliminating the need for separate heat rejection systems. This merging reduces overall system weight while maintaining reliable cabin conditioning.
Solution Approach 2:
The patent employs thin-film radiator materials and flexible thermal management components that provide high heat rejection efficiency per unit weight. These advanced materials and structures achieve effective thermal management with minimized mass, addressing the weight concern while maintaining cabin conditioning reliability.
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 effectively maintains comfortable and healthy cabin conditions for occupants by minimizing disturbances and optimizing thermal management, even in extreme environments, reducing energy requirements and system weight.
Implementation Method 1
combined with a heat pump to increase the temperature of the working fluid, enhancing heat rejection capabilities
Implementation Method 2
includes a refrigerant loop for thermal management and humidity control
Implementation Method 3
The system employs phase-change techniques like water pervaporation
Data Source
AI summary
The cabin conditioning system can include a cabin air loop, a refrigerant loop, and a set of thermal rejection components. The system can optionally include a phase-change fluid loop. However, the cabin conditioning system can additionally or alternatively include any other suitable set of components. The cabin conditioning system functions to condition a cabin interior (and/or an air volume therein) of a vehicle, such as an atmospheric and/or space-flight capsule. Additionally or alternatively, the system can function to reject heat from the vehicle interior and/or vehicle power systems (e.g., avionics components thereof). Additionally or alternatively, the system can function to maintain the humidity of air within the cabin interior. However, the cabin conditioning system can include any other suitable components.