Tintable Window Control Using Outside Temperature and Sun Position
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Solution Overview
Problem
Electrochromic devices, particularly electrochromic windows, have not realized their full commercial potential due to various issues and require advanced control methods to optimize their functionality.
Innovation Solution
A system and method for controlling tintable windows using outside temperature and sun position to determine optimal tint states, incorporating cloud-based 3D modeling and sensor data to adjust tint levels dynamically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If electrochromic windows are used to control light transmission, then energy efficiency is improved, but device complexity increases due to multiple sensors and control systems
Solution Approach 1:
The patent combines multiple control inputs (temperature sensors, photosensors, occupancy sensors, weather forecasts) into a unified window control system that integrates these diverse data sources to make coordinated tinting decisions, thereby managing complexity through systematic integration rather than separate independent systems
Solution Approach 2:
The window control system performs multiple functions: it monitors temperature, detects occupancy, receives weather forecasts, calculates optimal tint states, and controls electrochromic devices. This multi-functional approach consolidates what could be separate systems into one universal control platform
2Measurement precision
If multiple sensors and control systems are implemented, then tint control precision is improved, but device complexity increases
Solution Approach 1:
The system implements feedback loops where temperature sensors, photosensors, and occupancy sensors continuously monitor environmental conditions and occupant presence, feeding this data back to the control system which adjusts tint states accordingly. Weather forecast data provides predictive feedback, allowing the system to pre-adjust tint levels before extreme conditions occur
Solution Approach 2:
The control system dynamically changes multiple parameters including temperature thresholds, light transmission levels, and tint transition rates based on real-time sensor data and weather forecasts. This multi-parameter control enables precise tint adjustment while managing system complexity through coordinated parameter optimization
3Adaptability or versatility
If real-time sensor data and weather forecasts are integrated, then adaptability is improved, but information processing requirements increase
Solution Approach 1:
The system incorporates weather forecast data to perform preliminary actions by pre-adjusting window tint states in anticipation of upcoming temperature changes or extreme weather conditions. This predictive capability allows the system to adapt proactively rather than reactively, improving adaptability while distributing information processing over time
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
Enhances energy efficiency and comfort by optimizing light transmission based on environmental conditions, addressing the limitations of existing electrochromic technologies.
Implementation Method 1
Electrochromism is a phenomenon in which a material exhibits a reversible electrochemically-mediated change in an optical property when placed in a different electronic state, typically by being subjected to a voltage change.
Implementation Method 2
a weather-based tint state based on one or both of infrared sensor readings and photosensor readings
Implementation Method 3
a weather-based tint state based on one or both of infrared sensor readings and photosensor readings
Data Source
AI summary
Methods and systems for determining tint of at least one tintable window when the outside temperature is greater than a first threshold and/or less than a second threshold value.