Closed Cycle Engine Heat Recovery Loop for Improved Power Efficiency
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Solution Overview
Problem
Existing power generation and distribution systems face challenges in achieving improved power generation efficiency, reduced emissions, and increased power density, particularly in closed cycle engines like Stirling engines, which are limited by inefficient combustion, heat exchange, and mechanical losses, leading to reduced power output and portability.
Innovation Solution
A closed cycle engine system with a multi-piston free piston arrangement, utilizing a noble gas as the working fluid, coupled with a chiller assembly and heat exchangers, and a control system to manage temperature differentials, enhancing thermal and electrical efficiency and power output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If closed cycle engines are used to improve power generation efficiency, then emissions are reduced, but power output and power density decrease
Solution Approach 1:
The system divides the power generation function across multiple piston assemblies (first, second, third, and fourth piston assemblies) operating in parallel within the closed cycle engine. Each piston assembly processes working fluid independently through its own cylinder, allowing the system to accumulate power output from multiple sources while maintaining the efficient closed cycle operation that reduces emissions and energy loss.
2Loss of energy
If closed cycle engines are used to improve power generation efficiency, then emissions are reduced, but portability deteriorates
Solution Approach 1:
The system integrates multiple functional components into a unified closed cycle engine architecture where piston assemblies, heat exchangers, and working fluid circulation systems are combined into a single coordinated system. This merging allows the engine to achieve high efficiency and low emissions while maintaining a compact form factor suitable for portable applications, as the integrated design eliminates the need for separate auxiliary systems.
3Power
If multi-piston free piston arrangement is used to increase power output, then thermal and electrical efficiency improve, but device complexity increases
Solution Approach 1:
Each piston assembly in the multi-piston arrangement is designed as a universal module that performs multiple functions: it compresses working fluid, drives the electrical generator, and transfers thermal energy through integrated heat exchangers. This multi-functionality allows the system to increase power output through multiple pistons without proportionally increasing complexity, as each additional piston adds power capacity while reusing the same fundamental design architecture.
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 improved thermal and electrical efficiencies, increased power generation, and maintains power density, suitable for small-scale and portable applications, addressing inefficiencies in existing closed cycle engines.
Implementation Method 1
A heater body is positioned at first end A101 of the system and is in thermal communication with the expansion chamber A221
Implementation Method 2
A chiller assembly is positioned at the second end A103 of the system and is in thermal communication with the compression chamber A222
Implementation Method 3
The movement of the piston assembly A1010 causes the electric machines to generate electricity
Data Source
Figure 1.1.1~1.1.2
Figure 1.1.3
Figure 1.1.4
AI summary
A system for energy conversion, the system including a closed cycle engine defining a hot side and a cold side, a heater loop positioned at least in part in a heat exchange relationship with the hot side of the closed cycle engine for imparting thermal energy thereto, and a hot side heat exchanger positioned along an intake line of the heater loop, wherein the heat loop has a heat recovery loop operable to recover heat from the hot side and return the recovered heat to the hot side, and wherein the heat recovery loop has a recirculation loop in fluid communication with the intake line for recirculating heating working fluid to the hot side heat exchanger.