Compressed Air Energy Storage Heating Medium Temperature Control
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Solution Overview
Problem
Compressed air energy storage (CAES) systems face issues with temperature fluctuations in heat media, leading to viscosity increases and decreased power generation efficiency due to unstabilized fluid states.
Innovation Solution
A CAES power generation device with a heat management system that includes a first and second heat exchanger, heat storage units, and a sub flow passage with a heating means to maintain optimal heating medium temperature and viscosity, utilizing temperature and volume detection for dynamic switching between main and sub flow passages to prevent wasteful heating and ensure efficient fluid circulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the heating medium temperature is reduced to increase viscosity control, then the fluid state stability improves, but the temperature decreases causing higher viscosity and potential flow problems
Solution Approach 1:
The heating means is activated in advance to heat the heating medium before it enters the heat exchanger, preventing temperature drop and viscosity increase that would occur during normal operation. This preliminary heating action ensures the heating medium maintains optimal temperature and flow characteristics throughout the system.
Solution Approach 2:
The heating means acts as an intermediary device between the heat storage unit and the heat exchanger, providing additional thermal energy to the heating medium to compensate for temperature losses and maintain stable fluid properties during operation.
2Stability of the object's composition
If the heating means is always activated to maintain temperature, then the heating medium temperature stability improves, but the energy consumption increases
Solution Approach 1:
The control means continuously monitors the temperature of the heating medium and activates or deactivates the heating means based on detected temperature conditions. This feedback mechanism ensures the heating means operates only when necessary to maintain temperature stability, avoiding unnecessary energy consumption while ensuring temperature requirements are met.
Solution Approach 2:
The system dynamically adjusts the operation of the heating means based on real-time temperature conditions, transitioning between active heating and passive maintenance modes to optimize the balance between temperature stability and energy efficiency.
3Device complexity
If a simple single flow passage is used, then the device complexity is reduced, but the ability to dynamically adjust for temperature and volume conditions is lost
Solution Approach 1:
The flow passage system is segmented into a main flow passage and a sub flow passage, with the heating means positioned in the sub passage. This segmentation allows the system to route the heating medium through different paths based on operational conditions, providing adaptability for temperature and volume management while maintaining relatively simple individual passage structures.
Solution Approach 2:
The dual flow passage structure serves multiple functions: the main passage handles normal high-volume flow, while the sub passage with heating means handles temperature correction and stabilization. This multi-functional design allows a single system to address both flow efficiency and temperature control requirements.
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 effectively stabilizes the heating medium's temperature and viscosity, preventing drift in the heat exchanger and maintaining power generation efficiency by dynamically adjusting the flow passage based on detected temperatures and volumes, thus enhancing overall system performance.
Implementation Method 1
a first heat exchanger that conducts heat exchange between the heating medium and the compressed air supplied from the compressor to the pressure accumulation unit so as to cool the compressed air and heat a heating medium
Implementation Method 2
a second heat exchanger that conducts heat exchange between the compressed air supplied from the pressure accumulation unit to the expander and the heating medium supplied from the first heat storage unit so as to heat the compressed air and cool the heating medium
Implementation Method 3
a first heating means that is provided in a middle of the shortened flow passage, and heats the heat medium passing therethrough
Data Source
AI summary
In a main flow passage, a first heat exchanger, a first heat storage unit, a second heat exchanger, and a second heat storage unit are connected by a heating medium flow passage. The main flow passage allows a heating medium to be circulated. A sub flow passage includes a shortened flow passage which is a part of the heating medium flow passage and branches from the heating medium flow passage between the second heat exchanger and the second heat storage unit and extends to the first heat storage unit. The sub flow passage allows circulation of the heating medium between the first heat storage unit and the second heat exchanger. A first heating means in a middle of the shortened flow passage, the first heating means heating a passing heat medium, and a switching means conducting switching between the main flow passage and the sub flow passage are provided.