Hybrid Liquid Nitrogen Power Cycle Using Ambient Heat
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Solution Overview
Problem
Existing power generation and transportation systems rely on fossil fuels, leading to carbon dioxide emissions and environmental pollution, and existing renewable energy sources like solar panels and wind turbines have low power density and are not continuously operational.
Innovation Solution
A hybrid power cycle using liquid nitrogen as a working fluid in closed cycles, combining a vapor power cycle with a refrigeration cycle, with thermodynamic cycle hybridization to recycle the working fluid and utilize ambient heat for continuous power generation and mechanical power without emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If fossil fuels are used for power generation and transportation, then energy supply is ensured, but carbon dioxide emissions and environmental pollution increase
Solution Approach 1:
The invention changes the fundamental parameter of energy source from fossil fuels to ambient thermal energy. By utilizing the temperature difference between ambient air and liquid nitrogen, the system transforms waste thermal energy into useful work through thermodynamic cycles, eliminating carbon dioxide emissions while ensuring continuous energy supply
Solution Approach 2:
The invention exploits phase transitions of liquid nitrogen (liquid-vapor transition) combined with ambient heat absorption to drive thermodynamic cycles. The working fluid undergoes repeated phase changes to convert thermal energy from ambient air into mechanical work, providing clean energy without emissions
2Productivity
If solar panels and wind turbines are used for renewable energy generation, then emissions are reduced, but power density is low and continuous operation is not achieved
Solution Approach 1:
The invention achieves continuous operation by utilizing ambient thermal energy which is constantly available. The thermodynamic cycle operates continuously as long as liquid nitrogen is supplied, unlike intermittent solar and wind resources. The system maintains steady-state operation with continuous heat absorption from ambient air and continuous work output
Solution Approach 2:
The invention improves power density by changing the energy conversion mechanism from direct solar/wind to thermodynamic cycle-based conversion. The high temperature difference between ambient air and liquid nitrogen enables efficient heat-to-work conversion, achieving higher power density compared to conventional renewable systems
3Object-generated harmful factors
If liquid nitrogen is used as working fluid in closed hybrid cycles, then clean continuous power generation is achieved, but system complexity increases
Solution Approach 1:
The invention merges a power cycle and a refrigeration cycle into a hybrid system sharing common components (compressor, heat exchangers, working fluid). This integration reduces overall system complexity compared to separate systems, while maintaining clean operation and continuous power generation through coordinated cycle operation
Solution Approach 2:
The hybrid system performs multiple functions simultaneously: power generation, refrigeration, and heat pumping. The same liquid nitrogen working fluid and thermal energy source serve both power cycle and refrigeration cycle, reducing component count and system complexity while achieving multiple objectives
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 generates clean electrical and mechanical power continuously with high power density and zero emissions, reducing operational costs and environmental impact, and can be used for refrigeration and air conditioning, with potential for decentralized production of liquid nitrogen.
Implementation Method 1
the compressed liquid and vapor streams are combined in a heat exchanger to absorb ambient heat
Implementation Method 2
absorb ambient heat from air or water through heat exchangers
Implementation Method 3
they undergo turbo-expansion yielding a minimum external achievable work of 60.63KJ/kg of liquid nitrogen
Implementation Method 4
The vapor in the partial refrigeration cycle undergoes a polytropic compression with the rejected heat removed by the compressed liquid in the partial power cycle
Data Source
AI summary
A Novel thermodynamic cycle known as the ‘Hybrid Power Cycle’ is proposed consisting of a power cycle and a refrigeration cycle in a partial form, using fixed amounts of the same working-fluid in closed cycles. The vapor in the partial refrigeration cycle undergoes a polytropic compression with the rejected heat removed by the compressed liquid in the partial power cycle before both are combined at same pressure prior to entering a heat exchanger to absorb ambient heat. When the temperature reaches the desired level, they undergo turbo-expansion yielding a minimum external achievable work of 60.63KJ/kg of liquid nitrogen (LN2). A novel binary-hybrid cycle was also invented to increase the external work-output to 77.79KJ/kg (LN2). This technology can be used to generate clean electrical and mechanical power including transportation without any fuel at a low cost, using only ambient heat with zero environmental pollution and zero global warming potential.