Hyperloop environmental control system
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Solution Overview
Problem
Existing environmental control systems for vehicles in low-pressure environments, such as hyperloop tubes, face challenges in efficiently conditioning the cabin due to limited power supply and impractical heat rejection methods, as conventional air conditioning and radiation methods are not viable.
Innovation Solution
An environmental control system utilizing a thermodynamic device with compressors and turbines to condition a medium, incorporating a regeneration heat exchanger and bypass conduits to manage airflow and heat transfer, enabling efficient cabin temperature and pressure regulation.
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 a heat exchanger as an intermediary component that transfers heat from the cabin air to a cooling medium (such as liquid coolant circulating through radiators). This mediator enables heat rejection without direct contact with the external vacuum environment, solving the problem of how to reject heat in a space where convection and conduction are ineffective.
Solution Approach 2:
The patent replaces the conventional mechanical compression-based refrigeration cycle with a thermodynamic expansion cycle using expanders/turbines. The expansion of compressed air through these devices provides both cooling effect and electrical power generation, eliminating the need for separate mechanical compressors and refrigerants.
2Loss of energy
If heat is rejected to deep space via radiation heat transfer, then heat rejection is possible in vacuum, but the tube walls being warmer than cabin reduces effectiveness
Solution Approach 1:
The patent uses a circulating cooling medium (liquid coolant) as an intermediary to absorb heat from the cabin air through heat exchangers. This coolant then transports the absorbed heat to radiators where it can be efficiently rejected to the tube walls or space, bypassing the limitation of direct radiation from warm tube walls.
Solution Approach 2:
The patent employs a hydraulic cooling system where liquid coolant circulates through closed-loop channels in heat exchangers and radiators. This hydraulic approach enables efficient heat transfer and distribution, allowing heat to be moved from the cabin to external radiating surfaces regardless of the tube wall temperature.
3Power
If on-board batteries supply electrical power at high speed, then power is available, but the limited quantity of electrical energy constrains system design
Solution Approach 1:
The patent implements a self-service energy system where the expansion of compressed air through expanders/turbines generates electrical power that directly drives the compressors and other system components. This self-generated power reduces or eliminates the need for external battery power, effectively making the system energy-self-sufficient during operation.
Solution Approach 2:
The patent recovers energy that would otherwise be wasted as heat or kinetic energy during air expansion. The expanders/turbines capture the energy from expanding air and convert it to useful electrical power, which is then stored in batteries or used immediately to power system components, thereby recovering energy that would be lost.
4Loss of energy
If a reasonably sized heat exchanger is used to reject heat in vacuum, then heat rejection capacity is sufficient, but the system size and weight increase
Solution Approach 1:
The patent designs heat exchangers that serve multiple functions: they cool the cabin air, pre-cool incoming air, and enable heat rejection to the external environment. The same thermal management system components perform multiple roles, reducing the total number and size of separate heat rejection devices needed.
Solution Approach 2:
The patent combines the cooling and heat rejection functions into an integrated thermal management system. The heat exchangers are merged with the cabin pressurization and air circulation systems, allowing a single system to handle multiple thermal control tasks simultaneously, thereby reducing overall system weight and complexity.
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 the cabin by recycling airflow and managing heat, maintaining comfort and power efficiency within the limited energy constraints of a hyperloop vehicle.
Implementation Method 1
A first source of the first medium (e.g., air) is provided to a compressor
Implementation Method 2
The compressed first medium is provided to at least one turbine of a thermodynamic device to extract energy therefrom to drive the compressor and other system components
Implementation Method 3
The compressed first medium is cooled using a second medium (e.g., cabin air) at a regeneration heat exchanger
Implementation Method 4
When the ambient atmosphere is non-existent, as in space applications, heat can be rejected to deep space via radiation heat transfer
Data Source
AI summary
An environmental control system for conditioning a cabin of a vehicle positioned in an enclosed air-evacuated environment includes a first inlet for receiving a first medium 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 is fluidly coupled to the first inlet and includes 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. A first mixing point is fluidly coupled to the second inlet and an outlet of the at least one turbine. A regeneration heat exchanger is fluidly coupled to another outlet of the thermodynamic device and to the at least one inlet.