Climate smart fan ventilation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current mechanical ventilation systems for buildings, particularly in hot and humid climates, face challenges such as moisture-related issues, energy inefficiency, high installation and maintenance costs, and the need for complex control systems that fail to consistently meet ASHRAE standards for indoor air quality.
Innovation Solution
A Climate Sensing Control Module (CSCM) that controls an electromechanical fan to supply fresh air based on temperature and humidity conditions, enabling or disabling the fan to ensure air quality compliance with ASHRAE standards, integrated with sensors and flexible installation options to create a Climate Smart Ventilation system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical ventilation is used to deliver fresh air, then indoor air quality is improved, but energy consumption increases
Solution Approach 1:
The ventilation system dynamically adjusts fan operation based on real-time monitoring of indoor air quality parameters (CO2, VOC, humidity, temperature) and outdoor conditions. The controller enables or disables the fan depending on whether outdoor air meets predefined quality thresholds, creating a dynamic response that optimizes energy use while maintaining air quality standards.
Solution Approach 2:
The system incorporates sensors that continuously monitor indoor air quality and provide feedback to the controller. This feedback loop allows the system to make informed decisions about when to operate the fan, adjusting ventilation based on actual air quality conditions rather than running continuously, thereby reducing energy consumption while maintaining acceptable air quality.
2Reliability
If fan is enabled to supply fresh air, then air quality compliance is improved, but moisture-related issues worsen in hot and humid climates
Solution Approach 1:
The controller monitors outdoor humidity levels and uses this feedback to make intelligent decisions about fan operation. When outdoor air is humid, the system can disable the fan or adjust operation to prevent introducing excessive moisture indoors, thereby avoiding moisture-related problems while still maintaining air quality compliance when conditions are favorable.
Solution Approach 2:
The system changes operational parameters based on outdoor conditions. By monitoring temperature and humidity thresholds, the controller adjusts fan operation to enable supply ventilation when outdoor air quality and humidity are acceptable, and disables or reduces operation when humidity levels would cause moisture problems, thus adapting to changing environmental parameters.
3Loss of energy
If climate sensing control is implemented, then energy efficiency is improved, but device complexity increases
Solution Approach 1:
The controller performs multiple functions: it monitors multiple air quality parameters (CO2, VOC, humidity, temperature), compares outdoor conditions against predefined thresholds, makes enable/disable decisions, and interfaces with the fan system. This multi-functional approach consolidates what could be multiple separate devices into a single integrated control unit, managing complexity while achieving energy efficiency.
Solution Approach 2:
The system is designed to operate autonomously once installed. The controller automatically monitors air quality parameters, compares conditions against predefined thresholds, and makes ventilation decisions without requiring user intervention. This self-service capability reduces operational complexity while maintaining energy efficiency through continuous automated monitoring and adjustment.
4Reliability
If continuous ventilation is provided, then indoor air quality is maintained, but long term energy cost increases
Solution Approach 1:
Instead of continuous operation, the ventilation system uses periodic monitoring of air quality parameters and conditional fan operation. The controller periodically assesses outdoor air quality and indoor conditions, enabling the fan only when conditions warrant ventilation. This periodic action maintains air quality while significantly reducing long-term energy costs compared to continuous operation.
Solution Approach 2:
The system transitions from static continuous operation to dynamic conditional operation. Fan operation is continuously adjusted based on real-time air quality measurements and outdoor conditions, creating a dynamic system that provides ventilation only when needed. This dynamic approach maintains air quality reliability while optimizing energy consumption over the long term.
Data Source
AI summary
A supply ventilation system controller for locating at an interior of a building. The controller comprises circuitry for receiving a signal representative of exterior air temperature and circuitry for receiving a signal representative of exterior relative humidity. The controller also comprises circuitry for establishing at least a first range of acceptable temperature and circuitry for establishing at least a first range of acceptable relative humidity. The circuitry for providing an enable/disable signal to a fan is responsive to at least one of: (i) the signal representative of exterior air temperature indicating satisfaction of the first range of acceptable temperature; or (ii) the signal representative of exterior relative humidity indicating satisfaction of the first range of acceptable relative humidity.