Heat-release retardative cold conduction device with multi-cavity and multi-phase change and method of calculating transfer heat thereof
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Solution Overview
Problem
Thermosyphons used in permafrost engineering suffer from uneven efficiency distribution in space and time, discontinuous operation, and low actual power due to reliance on external energy sources and complex systems, leading to engineering damages.
Innovation Solution
A heat-release retardative cold conduction device with multi-cavity and multi-phase change that utilizes phase-change energy storage, heat reflective cooling, and radiative refrigeration, incorporating multiple cavities and materials to regulate heat distribution without external energy, ensuring continuous operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a single thermosyphon is used for cold conduction, then the heat transfer efficiency is high with a rated power of up to 200 W, but the actual working power is only 50 to 60 W due to discontinuous operation and dependence on air temperature
Solution Approach 1:
The device is divided into multiple independent thermosyphons arranged in parallel, each capable of operating independently. This segmentation allows the system to maintain continuous cold conduction even when individual thermosyphons are not operating, thereby improving reliability and actual working power output.
Solution Approach 2:
Multiple thermosyphons are combined into a single integrated device with shared structural components and a unified cold conduction path. The merging of multiple thermosyphons creates a redundant system where the failure or non-operation of one unit does not compromise the overall system performance, ensuring continuous operation.
2Power
If thermosyphon refrigeration technology is improved through compression or adsorption approaches, then the cold-conducting power is increased and working time is prolonged, but the system complexity increases with photovoltaic panels, batteries, inverters and generator sets
Solution Approach 1:
The thermosyphon system operates autonomously using natural phase change and gravity-driven refrigerant circulation without requiring external power sources or control systems. The device self-regulates its operation based on temperature differences, eliminating the need for photovoltaic panels, batteries, inverters, and generator sets while maintaining high cold-conducting power.
Solution Approach 2:
The invention replaces complex mechanical refrigeration systems (compression or adsorption approaches requiring external energy) with a passive thermodynamic system based on natural convection and phase change. This substitution eliminates the need for motors, compressors, and control electronics while achieving comparable or superior cold conduction performance.
3Ease of operation
If the thermosyphon relies on air temperature level for cold conduction in cold season, then the system operates passively, but the efficiency utilization is uneven and the foundation cannot work effectively in warm season
Solution Approach 1:
The device incorporates phase change materials with specifically selected melting and freezing points that allow operation across a wide temperature range. By changing the thermal parameters of the phase change materials, the system adapts to different seasonal conditions, maintaining effective cold conduction in both cold and warm seasons while retaining passive operation.
Solution Approach 2:
The invention uses composite structures combining multiple phase change materials with different thermal properties, heat transfer enhancement elements, and thermally conductive materials. This composite approach enables the system to maintain high efficiency across varying temperature conditions, providing seasonal adaptability while preserving the simplicity of passive operation.
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
Improves the regulation of heat distribution, enhances actual power, and prevents engineering damages by ensuring continuous operation and efficient heat transfer, addressing discontinuities in thermosyphon performance.
Implementation Method 1
the working medium inside the pipe continuously undergoes a liquid-gas phase transition
Implementation Method 2
achieves heat transfer by using liquid-gas phase transition
Implementation Method 3
phase-change heat transfer
Implementation Method 4
utilizes the principles of low-temperature phase-change energy storage
Implementation Method 5
phase-change energy storage
Implementation Method 6
utilizes the principles of low-temperature phase-change energy storage, heat reflective cooling and radiative refrigeration
Implementation Method 7
phase transition, phase-change heat transfer and gravity reflux
Data Source
AI summary
The invention provides a heat-release retardative cold conduction device with multi-cavity and multi-phase change and a method of calculating the transfer heat thereof. The device comprises an inner cavity, a heat-release retardative cavity, and a phase-change cold storage cavity. The inner cavity is a hollow sealing structure with an unobstructed central core and two closed ends, and a refrigerant is placed in the cavity; the heat-release retardative cavity is encased on a bottom region outside of the inner cavity, and a phase-change heat storage material is placed in the heat-release retardative cavity; the phase-change cold storage cavity is encased on the outside of the inner cavity and is located in a region above the heat-release retardative cavity, wherein the phase-change cold storage cavity does not completely encase a top region outside of the inner cavity, and a phase-change cold storage material is placed in the phase-change cold storage cavity.