Ventilation system for improving indoor air quality, HVAC system comprising the same and process thereof
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Solution Overview
Problem
Indoor air quality is compromised by particulate matter (PM2.5), volatile organic compounds (VOCs), and ozone, which can lead to health issues such as asthma, cardiovascular disease, and respiratory problems due to inadequate ventilation systems that fail to accurately monitor and respond to these pollutants.
Innovation Solution
A ventilation system equipped with PM2.5, CO2, and TVOC sensors that adjust the speed of air blowers based on real-time readings to introduce outdoor air, incorporating filters and noise reduction modules, ensuring improved air quality and comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If ventilation systems increase air exchange rate to reduce indoor pollutant levels, then indoor air quality improves, but energy consumption increases
Solution Approach 1:
The ventilation system dynamically adjusts the air exchange rate based on real-time indoor air quality conditions. Sensors continuously monitor PM2.5, CO2, and TVOC levels, and the control system modulates the blower speed accordingly, increasing ventilation when pollutants are high and reducing it when air quality is good, thereby resolving the contradiction between maintaining low pollutant levels and minimizing energy consumption
Solution Approach 2:
The system implements closed-loop feedback control where sensor readings of indoor air quality parameters (PM2.5, CO2, TVOC) are continuously fed back to the control system, which then adjusts the ventilation rate in response to the measured conditions. This feedback mechanism ensures the system provides adequate ventilation when needed while avoiding unnecessary energy consumption when air quality is already acceptable
2Measurement precision
If ventilation systems use multiple sensors to accurately monitor pollutants, then measurement precision improves, but device complexity increases
Solution Approach 1:
The system segments the monitoring function into three specialized sensors, each dedicated to detecting a specific pollutant type (PM2.5 particles, CO2 gas, TVOC volatile organic compounds). This segmentation allows each sensor to be optimized for its specific detection task, improving overall measurement precision while keeping individual sensor complexity low and manageable
Solution Approach 2:
The control system serves multiple functions: it processes signals from three different sensor types, compares readings against threshold values, determines appropriate ventilation responses, and controls the blower operation. By creating a universal control platform that handles all sensing and actuation tasks, the system achieves high measurement precision without proportionally increasing overall system complexity
Data Source
AI summary
The present invention provides a ventilation system for improving air quality of an indoor space. The system includes sensors for measuring PM2.5 particle level P, CO2 level C, and TVOC level T in the indoor space. A control circuit is configured to receive P, C and T values and generate an output signal Vout according to a specific algorithm, which in turn controls speed-variable EC motors that drive ventilating fans. The invention exhibits numerous technical merits such as lower energy consumption, programmable operation, high efficiency, and lower noise, among others.