Sky Sensor Device for Electrochromic Window Control
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Solution Overview
Problem
Traditional pyranometer-based electrochromic window systems are expensive and limited in their ability to measure solar irradiance effectively, failing to provide comprehensive monitoring of sky conditions and natural lighting optimization.
Innovation Solution
A sky sensor device that uses high-resolution image sequences and illuminance sensors to determine direct normal illuminance, integrating with cloud-based analytics to inform electrochromic window systems for optimal tinting and energy savings, while being more affordable and durable than pyranometer-based systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If pyranometer-based systems are used to measure solar irradiance, then measurement capability is provided, but cost is high and functionality is limited
Solution Approach 1:
The sky sensor device integrates multiple sensors (illuminance sensor, camera sensor, temperature sensor, humidity sensor) into a single multi-functional unit that can measure various sky conditions and environmental parameters, replacing the need for separate pyranometer systems while providing broader measurement capabilities
2Adaptability or versatility
If pyranometer-based systems are used to measure solar irradiance, then basic measurement is achieved, but comprehensive monitoring of sky conditions is limited
Solution Approach 1:
The patent combines multiple sensing functions (illuminance measurement, image capture, temperature sensing, humidity sensing) into a single integrated sky sensor device, enabling comprehensive sky condition monitoring while managing system complexity through unified design
3Reliability
If traditional pyranometer systems are deployed, then solar irradiance measurement is provided, but durability and maintenance requirements are not optimized
Solution Approach 1:
The sky sensor device incorporates self-diagnostics and automated calibration capabilities, with sensors designed to withstand outdoor environmental conditions, reducing the need for frequent manual maintenance and intervention while ensuring reliable long-term 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
The sky sensor device provides reliable, long-term monitoring of sky conditions, enabling advanced analysis and automation of electrochromic window tinting, reducing energy consumption and enhancing occupant comfort without the need for frequent maintenance.
Implementation Method 1
captures high-resolution image sequences of the sky using a camera
Implementation Method 2
measures an amount of illuminance with an illuminance sensor
Data Source
AI summary
A sky sensor device for measuring direct normal illuminance (DNE) value is described. One method controls a camera sensor to capture a series of exposure-bracketed images having a first dynamic range and generate an image from the series of exposure-bracketed images, the image having a second dynamic range higher than the first dynamic range. The method controls an illuminance sensor to measure a global illuminance value. The method determines a global horizontal diffuse value based on at least the image. The method determines a direct normal illuminance (DNE) value using the global illuminance value and the global horizontal diffuse value.