Heat Engine With Fluid-Assisted Isothermal Expansion
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Solution Overview
Problem
Existing heat engines are inefficient and costly for small capacities, particularly in solar energy systems, due to the use of gases with poor heat capacity and temperature deviations from isothermal expansion, leading to reduced efficiency.
Innovation Solution
A heat engine system that utilizes a mix of gas and fluid, where the fluid, with higher thermal capacity, maintains the gas at a constant temperature during expansion, allowing for isothermal processes, thereby increasing efficiency and reducing engine size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional heat engines use gases with poor heat capacity, then the engine can be simpler in design, but the efficiency is reduced due to temperature deviations from isothermal expansion
Solution Approach 1:
The patent introduces a heat transfer fluid as an intermediary substance between the heat source and the working gas. This fluid acts as a mediator that efficiently transfers thermal energy while maintaining the gas at constant temperature during expansion, thereby achieving isothermal conditions and improving efficiency without fundamentally redesigning the engine architecture
Solution Approach 2:
The patent changes the thermal parameters of the system by using a heat transfer fluid with high heat capacity to maintain constant temperature (isothermal conditions) during gas expansion. This parameter control transforms the thermodynamic process from adiabatic or polytropic to isothermal, significantly improving energy efficiency
2Power
If heat engines are designed for small capacities, then they are more suitable for distributed energy systems, but existing small-capacity engines are inefficient and costly
Solution Approach 1:
The patent applies isothermal expansion parameters to small-capacity engines, using a heat transfer fluid to maintain constant temperature during the expansion process. This thermodynamic parameter optimization enables small engines to achieve high efficiency comparable to or exceeding larger conventional engines, making distributed energy systems economically viable
3Loss of energy
If conventional engines operate without maintaining constant gas temperature, then the engine structure can be simpler, but the expansion process deviates from isothermal conditions reducing efficiency
Solution Approach 1:
The heat transfer fluid serves as an intermediary thermal management system that passively maintains isothermal conditions through its high heat capacity. Rather than active temperature control mechanisms, the fluid naturally absorbs and releases heat to maintain constant gas temperature during expansion and compression cycles
Solution Approach 2:
The heat transfer fluid self-regulates the temperature of the working gas through its thermal properties. During gas expansion, the fluid provides heat to maintain constant temperature; during compression, it absorbs excess heat. This self-service mechanism eliminates the need for complex external temperature control systems
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 achieves higher efficiency and cost-effectiveness by using fluid to stabilize gas temperature, enhancing isothermal expansion and compression, potentially reducing engine size by orders of magnitude and improving energy conversion from solar heat.
Implementation Method 1
enabling the HTF in the gas-and-HTF mix to heat the gas
Implementation Method 2
isothermal expansion of the gas in the gas-and-HTF mix
Implementation Method 3
causing the gas-and-HTF mix to eject through a nozzle, thereby converting the heat of the HTF to kinetic energy
Data Source
AI summary
A method for converting heat to mechanical work includes providing incoming heat transfer liquid (HTL) at a first temperature to a plurality of mixing chambers, providing incoming compressed gas at a second temperature to the plurality of mixing chamber, enabling the gas and the HTL to mix, producing a gas-and-HTL mix, enabling the HTL in the gas-and-HTL mix to heat the gas and isothermal expansion of the gas in the gas-and-HTL mix, limiting volume of the gas-and-HTL mix, thereby increasing pressure of the gas and causing acceleration of a flow of the gas-and-HTL mix, causing the gas-and-HTL mix to eject through a plurality of nozzles, thereby converting the heat of the HTL to kinetic energy to cause movement of the plurality of nozzles; and using the kinetic energy to produce mechanical work.