Liquid-Crystalline Optical Switch for Automatic Radiant Energy Regulation
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Solution Overview
Problem
Current window technologies, such as electrochromic devices and thermoresponsive systems, require electrical control or have limitations in adapting to varying weather and seasonal conditions, leading to inefficiencies in energy management and potential instability at low temperatures.
Innovation Solution
A thermoresponsive optical switch element utilizing a liquid-crystalline medium with specific compounds that undergo a phase transition between 20 and 50°C, allowing for automatic regulation of radiant energy flow without electrical control, by aligning molecules in a nematic or isotropic phase to control light transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If electrochromic devices or thermoresponsive systems are used for regulating radiant energy flow, then energy management is improved, but electrical control is required or adaptability to varying weather conditions is limited
Solution Approach 1:
The liquid-crystalline medium automatically responds to temperature changes without requiring external electrical control. The system serves itself by utilizing the natural thermotropic behavior of the liquid-crystalline compounds to regulate radiant energy flow based on ambient temperature conditions
Solution Approach 2:
The invention changes the physical state parameter of the liquid-crystalline medium from isotropic to nematic phase based on temperature. This parameter change automatically adjusts the optical properties of the medium to regulate radiant energy flow without electrical intervention
2Extent of automation
If liquid-crystalline medium undergoes phase transition between 20 and 50°C, then automatic regulation of radiant energy flow is achieved, but stability at low temperatures may be compromised
Solution Approach 1:
The invention uses a composite liquid-crystalline medium comprising multiple compounds (formula I compounds combined with other liquid-crystalline compounds) to achieve both automatic temperature-dependent regulation and improved low-temperature stability. The composite formulation balances phase transition behavior with operational reliability across temperature ranges
3Illumination intensity
If glass surfaces are used in buildings, then aesthetic appearance and brightness are improved, but undesired heating of interior spaces occurs in warm seasons
Solution Approach 1:
The liquid-crystalline medium is applied locally to the glass surface, creating a temperature-responsive layer that selectively regulates radiant energy flow. The local application allows the glass to maintain its aesthetic and brightness properties while adding adaptive thermal control capability at the surface level
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 enables efficient, automatic, and temperature-dependent regulation of radiant energy flow, enhancing energy management in buildings by optimizing light transmission based on external conditions while maintaining stability across a wide temperature range.
Implementation Method 1
the medium exhibits a temperature-induced phase transition from an isotropic to a liquid-crystalline phase, most preferably to a nematic phase
Implementation Method 2
the liquid-crystalline medium shows thermotropic behavior
Implementation Method 3
by aligning molecules in a nematic or isotropic phase to control light transmission
Data Source
AI summary
The present invention relates to an optical switch element, comprising a liquid-crystalline medium for the temperature-dependent regulation of radiant energy flow. The invention furthermore relates to the use of the optical 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, characterised in that it comprises 5-95% of a compound of the formula (I), in particular for use in the optical switch elements according to the invention.