Valved Cell Heat Engine for True Isochoric Displacement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing Stirling engines face challenges in achieving true constant volume (isochoric) displacement heat transfer processes due to the impracticality of instantaneous piston movements required by the ideal Stirling cycle, leading to inefficiencies and thermodynamic losses.
Innovation Solution
The EISG CCVC testbed employs a valved cell concept with synchronized volumes connected by valves to achieve isochoric displacement processes, utilizing a valved regenerator and exhaust recuperator to enhance thermal efficiency and reduce dead space, incorporating a valved regenerator to improve heat exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If instantaneous piston movements are used to achieve true constant volume displacement, then isochoric heat transfer efficiency is improved, but mechanical feasibility and reliability deteriorate
Solution Approach 1:
The patent divides the displacement process into two independent synchronized volumes (first and second displacers) that operate in parallel. Each displacer handles a portion of the isochoric heat transfer, eliminating the need for instantaneous single-piston movements while maintaining constant volume conditions through coordinated operation of multiple segments.
Solution Approach 2:
The patent introduces a regenerator as an intermediary heat storage device between the hot and cold spaces. The regenerator mediates heat transfer during the isochoric processes, allowing finite-rate heat exchange without requiring instantaneous piston movements, thus maintaining thermodynamic efficiency while ensuring mechanical feasibility.
2Use of energy by moving object
If synchronized volumes with valves are used to achieve isochoric displacement, then thermal efficiency is improved, but device complexity increases
Solution Approach 1:
The patent combines the functions of compression, expansion, and heat storage into a single integrated system where the first and second displacers share a common regenerator. This merging of functions reduces the need for separate components for each thermodynamic process, managing device complexity while maintaining high thermal efficiency through coordinated operation.
Solution Approach 2:
The regenerator serves multiple functions: it stores heat during the isochoric heating process, releases heat during the isochoric cooling process, and facilitates heat transfer between the two displacers. This multi-functionality reduces the need for separate heat exchangers for each process, managing device complexity while maximizing thermal efficiency.
3Productivity
If valved regenerator and exhaust recuperator are used to reduce dead space, then productivity is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent uses dynamic valve control where the timing and duration of valve openings are adjusted based on the instantaneous positions of the displacers. This dynamic synchronization allows the system to adapt to varying operating conditions, maintaining precise coordination between the two volumes without requiring extremely tight manufacturing tolerances on fixed components.
Solution Approach 2:
The system incorporates feedback mechanisms where the operation of one displacer informs the timing of valve operations for the other displacer. This feedback-based synchronization ensures that heat transfer processes are coordinated optimally, maximizing productivity while accommodating reasonable manufacturing variations through active control rather than relying solely on precision manufacturing.
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 approach enables a heat engine with true isochoric displacement, increasing thermal efficiency and reducing thermodynamic losses by optimizing heat transfer and minimizing dead space, effectively approximating a hybrid Ericsson/Stirling cycle.
Implementation Method 1
utilizing a valved regenerator and exhaust recuperator to enhance thermal efficiency
Implementation Method 2
employing a valved regenerator and exhaust recuperator to enhance thermal efficiency
Implementation Method 3
utilizing a valved regenerator and exhaust recuperator to enhance thermal efficiency
Implementation Method 4
effectively approximating a hybrid Ericsson/Stirling cycle
Data Source
AI summary
The present application relates to systems and methods for applying open cycle and closed cycle valved cell heat engines to Bland/Ewing (B/E) chemo-thermodynamic cycles. The application proposes several new embodiments of a closed cycle valved cell (CCVC) heat engine, including means to create a fully-regenerated isochorically-heated CCVC heat engine. The application further relates to the application of such a heat engine to B/E chemo-thermodynamic half-cycles.