Hyperloop Vapor Cycle Cooling Without Compressor or Condenser
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Solution Overview
Problem
Hyperloop systems face challenges in environmental control due to the lack of ambient atmosphere for heat rejection via convection or radiation, and limited electrical power availability, making traditional air conditioning systems impractical for maintaining cabin comfort and cooling electronics without high power consumption.
Innovation Solution
A hyperloop vapor cycle environmental control system that operates without a compressor or condenser heat exchanger, using a water vessel to generate a two-phase water and vapor stream that absorbs heat from cabin air and electronics, with the heat absorbed causing evaporation and steam to be exhausted into the evacuated tube, while maintaining control through expansion valves and pressure regulators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a traditional air conditioning system with compressor and condenser is used, then cooling capability is provided, but power consumption increases and system complexity increases
Solution Approach 1:
The patent removes the compressor and condenser from the traditional vapor cycle air conditioning system, extracting only the essential evaporator and expansion valve components. This eliminates the high-power compression stage while maintaining cooling capability through direct expansion of water in the evaporator, thereby resolving the contradiction between cooling capability and power consumption.
Solution Approach 2:
The system changes the operating parameters by using water as a refrigerant alternative and operating at lower pressures without compression. The expansion valve controls the pressure drop and flash evaporation of water, achieving cooling through phase change at low power consumption, thus resolving the energy consumption issue while maintaining temperature control.
2Temperature
If a traditional air conditioning system with compressor and condenser is used, then cooling capability is provided, but system complexity increases
Solution Approach 1:
The patent extracts and removes the complex compressor and condenser components from the traditional system, retaining only the essential evaporator and expansion valve. This simplification directly addresses the contradiction by reducing system complexity while preserving the core cooling function through water expansion and evaporation.
Solution Approach 2:
The system uses water stored in the vehicle's water tank as both a resource and a refrigerant. The water serves multiple functions: as a flash evaporating refrigerant in the evaporator, and as a stored thermal resource. This self-service approach eliminates the need for external compressors and condensers, reducing system complexity while maintaining cooling capability.
3Loss of energy
If heat rejection via radiation is used, then heat can be rejected in vacuum environment, but cooling efficiency decreases when tube walls are warmer than cabin
Solution Approach 1:
The patent converts the harmful effect of the vacuum environment (inability to use convection) into a benefit by using phase change evaporation. The flash evaporation of water in the evaporator provides intense cooling through latent heat absorption, effectively converting the constraint of no atmosphere into an opportunity for efficient evaporative cooling that doesn't rely on external heat rejection.
Solution Approach 2:
The system utilizes phase transitions of water (liquid to vapor) in the evaporator to achieve cooling. The flash evaporation process absorbs latent heat from the cabin air, providing efficient cooling without requiring external heat rejection mechanisms. This phase change approach resolves the contradiction by providing effective heat removal independent of the external environment's temperature.
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 solution effectively cools the cabin and electronics without the need for a compressor, reducing power consumption and allowing for efficient heat rejection, as the system leverages the latent heat of vaporization to cool the air and electronics without relying on external heat exchangers or pumps.
Implementation Method 1
the two-phase water and vapor stream absorbs heat from a flow of entering warm cabin air, thereby reducing a temperature of the entering warm cabin air
Implementation Method 2
the heat absorbed into the two-phase water and vapor stream results in the water from the two-phase water and vapor stream evaporating, thereby yielding produced steam
Implementation Method 3
a first portion of the water from the water vessel is configured to flow through a cabin expansion valve where a pressure and a temperature of the first portion of the water is reduced below a temperature of the vehicle cabin thereby turning the first portion of the water into a two-phase water and vapor stream
Data Source
AI summary
The present disclosure provides for hyperloop vapor cycle environmental control systems (ECS) and related methods. More particularly, the present disclosure provides for hyperloop vapor cycle environmental control systems and methods, with the hyperloop vapor cycle environmental control systems and methods configured without a compressor needed to pump a refrigerant through the system and configured without a condenser heat exchanger needed to condense gas refrigerant to a liquid to reject the heat of compression of a compressor to the ambient atmosphere. Since there is no need for a compressor, the example hyperloop ECS of the present disclosure requires only a small fraction of the electrical power of a standard vapor cycle air conditioning system. Power is needed substantially only for the ECS controller and some various valves.