Thermoresponsive Liquid-Crystalline Switch Element for Radiant Energy Regulation
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Solution Overview
Problem
Current window technologies, particularly those with high glass surfaces, face challenges in regulating radiant energy flow effectively across varying climatic conditions, leading to inefficient energy management in buildings, as they either allow excessive heating in warm seasons or require additional infrastructure for electrically controlled solutions.
Innovation Solution
A thermoresponsive switch element utilizing a liquid-crystalline medium with specific compounds that transitions between states based on temperature, allowing for automatic adjustment of radiant energy transmission without the need for electrical control, comprising compounds of formulas (I), (II), (III), and (IV) in specific concentrations, and integrated with polarizers for efficient light management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If glass surfaces are used in buildings for aesthetic reasons and brightness, then illumination intensity and visual comfort are improved, but energy efficiency deteriorates due to excessive radiant energy transmission causing unwanted heating
Solution Approach 1:
The patent applies a thermoresponsive liquid-crystalline medium that dynamically changes its optical properties based on temperature. At lower temperatures, the medium allows high light transmission for brightness, while at elevated temperatures, it automatically reduces radiant energy transmission to prevent excessive heating, thus adapting to environmental conditions without external control
Solution Approach 2:
The invention utilizes temperature-induced phase transitions in the liquid-crystalline medium to change optical parameters. The medium transitions between different phases (isotropic, nematic, smectic) at specific temperature ranges, fundamentally altering its light transmission properties to balance illumination needs with energy efficiency
2Adaptability or versatility
If electrically controlled switch elements are used to regulate radiant energy flow, then control precision is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent employs a self-regulating thermoresponsive system where the liquid-crystalline medium automatically adjusts its optical transmission based on temperature feedback from the environment. The system serves itself by using the temperature difference between interior and exterior surfaces to trigger phase transitions, eliminating the need for external sensors, power sources, or control electronics
Solution Approach 2:
The invention replaces complex electrical control systems with a passive thermodynamic mechanism. Instead of using motors, heaters, or electronic controllers to change the optical state, the system relies on natural heat transfer and temperature-induced phase transitions of the liquid-crystalline material to achieve the desired radiant energy regulation
3Ease of operation
If thermoresponsive liquid-crystalline media are used to regulate radiant energy, then ease of operation is improved, but manufacturing precision requirements increase due to specific compound concentrations
Solution Approach 1:
The patent utilizes composite liquid-crystalline formulations containing multiple specific compounds (cyclohexylbenzene derivatives, cyanobiphenyl compounds, ester compounds) in precisely defined concentration ranges. These composite formulations are engineered to exhibit specific phase transition temperatures and optical properties, requiring controlled manufacturing processes to achieve consistent performance across production batches
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 solution enables adaptive control of radiant energy flow, optimizing energy efficiency by reducing heating costs in warm seasons and minimizing cooling needs, while avoiding the drawbacks of electrical systems, such as increased manufacturing complexity and potential flaws.
Implementation Method 1
the liquid-crystalline medium exhibits a temperature-induced phase transition from an isotropic to a liquid-crystalline phase
Implementation Method 2
the liquid-crystalline medium shows thermotropic behavior
Implementation Method 3
The liquid-crystalline medium has the property of rotating the plane of polarisation of the light at a first temperature and not rotating or essentially not rotating the plane of polarisation of the light at a second temperature
Data Source
AI summary
The present invention relates to a switch element, which is thermoresponsive and which switches between a less transmissive state for radiant energy and a more transmissive state for radiant energy, and which comprises a liquid-crystalline medium. The invention furthermore relates to the use of the switch element for the regulation of radiant energy flow between interior spaces and the environment and for the regulation of the temperature of interior spaces. The invention furthermore relates to a liquid-crystalline medium, characterized in that it comprises 5-60% of a compound of the formula (I), in particular for use in the switch elements according to the invention.