Hyperloop environmental control system
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Environmental control systems for vehicles in low-pressure environments, such as hyperloop tubes, face challenges in heat rejection and power efficiency due to the absence of ambient atmosphere, making conventional air conditioning and heat transfer methods impractical.
Innovation Solution
An environmental control system utilizing a thermodynamic device with a compressor and turbines in series, coupled with a regeneration heat exchanger and bypass conduit, efficiently conditions cabin air and manages heat transfer by mixing and recycling air and medium flows to optimize energy use and heat rejection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional air conditioning systems are used to provide cool air to the cabin, then cooling function is achieved, but heat rejection becomes impractical in the absence of ambient atmosphere for convection
Solution Approach 1:
The patent introduces a heat exchanger as an intermediary device that enables heat transfer from the cabin air to the external environment through the tube wall. The heat exchanger uses the tube wall itself as the heat transfer medium, allowing thermal energy to be conducted through the wall structure rather than requiring direct convection to ambient air.
Solution Approach 2:
The patent replaces the conventional convection-based heat rejection system with a radiation-based system. The heat exchanger is designed to reject heat via thermal radiation to the external environment, substituting the mechanical convection process with electromagnetic radiation transfer that does not require an ambient atmosphere.
2Loss of energy
If heat is rejected via radiation to the tube walls, then heat transfer is possible, but the system becomes impractical when tube walls are warmer than the cabin
Solution Approach 1:
The patent implements a dynamic heat rejection system that can adapt its operating mode based on the temperature differential between the cabin and tube wall. The system can switch between rejecting heat to the tube wall when the wall is cooler, and using the tube wall as a heat sink when the wall is warmer, allowing flexible adaptation to varying thermal conditions.
Solution Approach 2:
The heat exchanger is designed with multi-functionality to handle different heat transfer scenarios. It can operate in multiple modes: rejecting heat to the tube wall when cooler, using the tube wall as a heat sink when warmer, and providing both heating and cooling functions to the cabin, making the system universally applicable across varying thermal conditions.
3Speed
If on-board batteries supply electrical power at high speed, then power independence is achieved, but the limited electrical energy constrains the environmental control system
Solution Approach 1:
The patent implements a self-service thermodynamic cycle where the system generates its own mechanical power through the expansion of compressed air in the turbine. The turbine is mechanically coupled to the compressor, allowing the expansion process to directly drive the compression process, creating a self-sustaining cycle that reduces external electrical power requirements.
Solution Approach 2:
The system recovers and utilizes the thermal energy that would otherwise be wasted during air expansion. The heat exchanger captures the thermal energy from the expanding air and redirects it to pre-heat the incoming air or provide cabin heating, thereby recovering useful energy and reducing the overall electrical power consumption of the environmental control system.
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 conditions cabin air and manages heat transfer within the limited power and atmospheric constraints of a hyperloop environment, ensuring comfort and efficient energy use while maintaining a stable cabin pressure.
Implementation Method 1
a compressor and at least one turbine operably coupled by a shaft. The first medium is provided to the compressor and the at least one turbine in series
Implementation Method 2
at least one turbine operably coupled by a shaft. The first medium is provided to the compressor and the at least one turbine in series
Implementation Method 3
A regeneration heat exchanger is fluidly coupled to another outlet of the thermodynamic device and to the at least one inlet
Implementation Method 4
A first mixing point is fluidly coupled to the second inlet and an outlet of the at least one turbine
Data Source
Figure 1
AI summary
An environmental control system for conditioning a cabin of a vehicle positioned in an enclosed air-evacuated environment includes a first inlet (24) for receiving a first medium (A1) and at least one inlet for receiving a second medium. The second medium includes a first flow of the second medium and a second flow of the second medium. A thermodynamic device (30) is fluidly coupled to the first inlet (24) and includes a compressor and at least one turbine operably coupled by a shaft. The first medium (A1) is provided to the compressor and the at least one turbine in series. A first mixing point (M1) is fluidly coupled to the second inlet and an outlet of the at least one turbine. A regeneration heat exchanger (56) is fluidly coupled to another outlet of the thermodynamic device (30) and to the at least one inlet.