Weather responsive smart ventilation system using multiple optimization parameters
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Solution Overview
Problem
Existing HVAC systems lack an efficient method to optimize ventilation flow rates based on natural daily and seasonal temperature and humidity cycles, leading to suboptimal energy use and indoor comfort in humid climates.
Innovation Solution
A method that calculates a residual sum of squares for temperature and moisture differences between indoor and outdoor conditions to adjust ventilation fan flow rates dynamically, shifting operation from high to low difference periods, using online weather and smart thermostat data without specific measurement devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous mechanical ventilation is used to maintain indoor air quality, then pollutant exposure is reduced, but energy consumption increases
Solution Approach 1:
The ventilation system dynamically adjusts fan flow rates based on real-time outdoor temperature and humidity conditions. The system transitions from static continuous ventilation to dynamic variable ventilation, optimizing energy consumption while maintaining indoor air quality through weather-responsive control algorithms
Solution Approach 2:
The system changes ventilation parameters (flow rate, operation timing) based on outdoor environmental parameters (temperature, humidity, dew point). By monitoring these parameters and adjusting ventilation accordingly, the system reduces energy consumption during unfavorable outdoor conditions while maintaining air quality standards
2Reliability
If ventilation rate is increased to improve indoor air quality, then pollutant exposure is reduced, but heating and cooling loads increase
Solution Approach 1:
The system performs preliminary ventilation during periods when outdoor conditions are favorable (moderate temperature, low humidity). By pre-ventilating the building envelope under these conditions, the system reduces the heating and cooling load that would otherwise be required to condition the building, while still achieving air quality goals
3Use of energy by moving object
If weather-responsive ventilation is used to reduce energy consumption, then heating and cooling loads are reduced, but indoor air quality may be compromised
Solution Approach 1:
The system incorporates feedback mechanisms that continuously monitor outdoor conditions (temperature, humidity, dew point) and adjust ventilation operations accordingly. This feedback control ensures that ventilation rate reductions do not compromise indoor air quality by maintaining appropriate ventilation during periods when outdoor conditions support healthy indoor environments
Data Source
AI summary
A smart ventilation system which uses outdoor temperature and moisture to optimize control of the system. The main principle is to shift ventilation from time periods that have large indoor-outdoor temperature and moisture differences to periods when these differences are smaller, and their energy and comfort impacts are expected to be less. Fan flow rates are reduced when the outside temperature and moisture falls outside of optimum levels, yet overall air exchange is maintained to ensure chronic and acute exposure to pollutants remains relative to best practice. Online weather and smart thermostat data can be used as control inputs, so no specific measurement devices are needed to control ventilation fans.