Hyperloop Cabin Cooling With Turbine-Driven Heat Rejection
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Solution Overview
Problem
Environmental control systems for vehicles in low-pressure or vacuum environments, such as hyperloop tubes, face challenges in heat rejection and power efficiency due to the lack 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 to condition air, where energy is extracted from the compressed medium to drive the compressor, and a regeneration heat exchanger is used to manage heat, with a bypass conduit and valves to control flow and optimize energy use.
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 vacuum environment
Solution Approach 1:
The patent introduces an intermediary fluid (liquid or gas stored in reservoirs) that serves as a heat transfer medium between the cabin environment and the thermodynamic device. This intermediary enables heat rejection functions in the vacuum environment by providing a substance that can absorb and transport heat away from the cabin, overcoming the lack of ambient atmosphere for direct heat dissipation.
Solution Approach 2:
The system changes the operating parameters by using a thermodynamic cycle that operates with stored fluids rather than relying on ambient atmospheric pressure. The thermodynamic device utilizes phase changes and pressure variations of the stored fluids to achieve cooling and heat rejection functions that are incompatible with conventional AC systems in vacuum conditions.
2Loss of energy
If heat is rejected to deep space via radiation heat transfer, then heat rejection is achieved in vacuum, but the tube walls being warmer than cabin reduces effectiveness
Solution Approach 1:
The patent employs an intermediary thermodynamic system with stored fluids that act as a heat sink, mediating the heat transfer process. Instead of relying directly on radiation to space or conduction to tube walls, the system uses the thermodynamic cycle of stored fluids to absorb heat from the cabin and reject it through controlled expansion and heat exchange processes, bypassing the temperature gradient limitation imposed by warm tube walls.
3Speed
If on-board batteries supply electrical power at high speed, then propulsion is achieved, but power consumption is limited
Solution Approach 1:
The thermodynamic device is designed to be self-sufficient by using stored fluids as its working medium, eliminating the need for external power sources. The system recovers and stores energy through the thermodynamic cycle, using the expansion and compression of fluids to drive components without requiring electrical power from limited on-board batteries, thereby enabling operation during high-speed travel when power consumption is constrained.
4Loss of energy
If a reasonably sized heat exchanger is used to reject heat in vacuum, then heat rejection capacity is improved, but system size and complexity increase
Solution Approach 1:
The patent replaces the need for large conventional heat exchangers with an intermediary thermodynamic system using stored fluids. The heat rejection function is achieved through the phase change and expansion processes of the stored fluids, which provide high heat transfer coefficients and compact heat exchange surfaces, thereby maintaining heat rejection capacity while significantly reducing the size and complexity of the heat exchanger components.
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 system effectively conditions the cabin air and manages heat transfer efficiently, reducing power consumption and maintaining comfort in low-pressure environments while minimizing the size and power requirements of the heat exchanger.
Implementation Method 1
a compressor and a plurality of turbines operably coupled by a shaft
Implementation Method 2
Energy extracted from the second medium at one of the plurality of turbines is used to drive the compressor
Implementation Method 3
a regeneration heat exchanger is fluidly coupled to and located downstream from an outlet of the compressor and an outlet of one of the plurality of turbines
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), at least one inlet for receiving a second medium, and a thermodynamic device (30) including a compressor (32) and a plurality of turbines operably coupled by a shaft (34). The plurality of turbines includes a first turbine (36) and a second turbine (38) arranged in series relative to a flow of the first medium (A1). Energy extracted from the second medium at one of the plurality of turbines is used to drive the compressor (32). The flow of the first medium (A1) and a first flow of the second medium are mixed to form a third medium at a first mixing point (M1) located downstream from the thermodynamic device (30) relative to the flow of the first medium (A1).