Sealed Solar Collector Heat Pipe Switching for Stagnation Control
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Solution Overview
Problem
Insulated solar panels face challenges in operating at higher temperatures than conventional solar thermal collectors, leading to potential damage due to uncontrolled internal temperature increases, which existing systems fail to effectively manage.
Innovation Solution
The implementation of a solar thermal collector with an absorber and internal insulation, featuring a heat transfer mechanism that transitions from thermal isolation to active heat transfer above a pre-defined temperature, using components like heat pipes, circulation pipes, or venting tubes to manage temperature and prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transparent insulation material is used to improve energy conversion efficiency, then energy conversion efficiency is improved, but internal temperature control capability deteriorates
Solution Approach 1:
The patent applies a dynamic heat transfer mechanism that transitions between thermal isolation and active heat transfer states based on temperature conditions. The system dynamically adjusts its thermal conductivity to maintain optimal operating temperatures, resolving the contradiction between maximizing efficiency and controlling temperature.
Solution Approach 2:
The patent changes the thermal parameter of the heat transfer mechanism based on operating conditions. By adjusting the effective thermal conductivity of the heat transfer path, the system can operate at high efficiency while preventing excessive temperature buildup that would damage components.
2Loss of energy
If transparent insulation material is used to suppress thermal convection and conduction, then thermal energy retention is improved, but temperature management capability deteriorates
Solution Approach 1:
The patent introduces a heat transfer mechanism as an intermediary between the absorber and the environment. This intermediary component mediates the thermal energy retention function while providing a controlled pathway for heat removal, thus maintaining both energy retention and temperature management capabilities.
Solution Approach 2:
The heat transfer mechanism operates passively based on temperature differentials and phase change principles, automatically regulating heat flow without external control systems. The system self-adjusts to maintain optimal temperatures, eliminating the need for active temperature management.
3Power
If the solar thermal collector operates at higher temperatures to increase energy output, then energy output is improved, but system reliability deteriorates due to potential damage
Solution Approach 1:
The patent implements a heat transfer mechanism that acts as a protective buffer before temperatures reach damaging levels. The mechanism preemptively removes excess heat through phase change and thermal conduction pathways, cushioning the system against temperature spikes that would compromise reliability.
Solution Approach 2:
The patent utilizes phase transition of the heat transfer fluid (e.g., evaporation of water or phase change materials) to absorb excess thermal energy at constant temperature. This phase change mechanism provides a natural temperature ceiling, allowing high energy output while maintaining system reliability through inherent thermal protection.
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 solution allows insulated solar panels to operate safely at higher temperatures, extending their lifespan and maintaining efficiency by actively managing internal temperatures, preventing damage and ensuring continuous energy distribution.
Implementation Method 1
The heat transfer mechanism may be implemented as a heat pipe, thermal siphon, venting tube, or circulation pipes with an actuator valve
Implementation Method 2
a working fluid inside the heat pipe configured to function with the heat pipe as the actuator
Implementation Method 3
the transparent insulation material is a thermal convection suppressor as a result of the geometry and physical characteristics of the material
Implementation Method 4
a thermal conduction suppressor as a result of the thermal properties of the material, including for example, thin walls of a honeycomb
Implementation Method 5
Thermally insulating panels transmissive to solar radiation, while having low transmissivity to thermal infra-red radiation
Implementation Method 6
The heat transfer mechanism may be implemented as a heat pipe, thermal siphon, venting tube, or circulation pipes with an actuator valve
Data Source
AI summary
Insulated solar panels that provide a solar thermal collector with means for limiting stagnation temperatures and preventing damage include: temperature limiting is provided by the insulated solar panel, isolating internal components from the environment, using passive closed systems within the sealed solar thermal collector, while also allowing alternative implementations as active systems and/or portions of the temperature limiting system outside the sealed solar thermal collector. A heat pipe can be used as a passive thermal switch, where the temperature induced action at a predetermined temperature causes an abrupt transition from a state of thermal isolation to a state of strong thermal coupling. Additionally, a set of siphon circulation pipes provides a passive closed system for temperature limiting.