Retrofittable Exhaust Air Blower Controller for Adaptive Ventilation
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Solution Overview
Problem
Mechanical exhaust ventilation systems in buildings often lead to uncontrolled air exchange, heat energy loss, discomfort, draft issues, and safety concerns due to the lack of adaptability and intelligence in existing exhaust air blower operations.
Innovation Solution
A retrofittable controller for exhaust air blowers, comprising a processor unit, data transfer unit, memory unit, sensor unit, and control unit, which measures exhaust air parameters and adjusts fan motor operation to implement need-adapted ventilation, enhancing safety, comfort, and reducing mechanical noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If mechanical exhaust ventilation operates at fixed speeds with timer control, then the system is simple to operate, but it causes uncontrolled air exchange and heat energy loss
Solution Approach 1:
The patent implements feedback control by using sensors to detect exhaust air parameters (temperature, humidity, CO2 concentration) and automatically adjusting the blower motor speed accordingly. This closed-loop system eliminates the need for manual timer control while reducing heat energy loss through adaptive ventilation that responds to actual indoor air quality conditions.
Solution Approach 2:
The system dynamically changes operational parameters (motor speed, ventilation rate) based on measured exhaust air characteristics. By varying the ventilation intensity according to real-time sensor data rather than fixed timer schedules, the system reduces unnecessary heat energy loss while maintaining adequate air exchange only when needed.
2Reliability
If exhaust air blower operates continuously at full capacity, then ventilation effectiveness is maximized, but mechanical noise increases
Solution Approach 1:
The patent transitions from static fixed-speed operation to dynamic variable-speed control. The blower motor speed is continuously adjusted based on sensor feedback, allowing the system to maintain adequate ventilation effectiveness while operating at lower speeds during periods of reduced demand, thereby significantly reducing mechanical noise generation.
Solution Approach 2:
Instead of continuous full-capacity operation, the system employs periodic measurement and adjustment cycles. Sensors periodically monitor exhaust air parameters and trigger speed adjustments only when necessary, allowing the blower to operate quietly at reduced speeds during stable conditions while maintaining ventilation effectiveness when air quality deteriorates.
3Adaptability or versatility
If retrofittable controller is added to existing exhaust air blower, then intelligence and adaptability are improved, but device complexity increases
Solution Approach 1:
The patent divides the control system into separate functional modules: sensor unit for parameter detection, processor unit for data analysis, and control unit for motor regulation. This segmentation allows each component to be independently optimized and installed on existing blowers, providing intelligent adaptability without requiring complete system replacement and minimizing overall complexity.
Solution Approach 2:
The retrofittable controller is designed as a universal solution that can be installed on various existing exhaust air blower models. The controller performs multiple functions (sensing, processing, control) in one integrated unit, enabling need-adapted ventilation across different applications without requiring application-specific custom designs, thus balancing adaptability with controlled complexity.
4Measurement precision
If sensor unit measures exhaust air parameters in real-time, then ventilation control precision is improved, but manufacturing cost increases
Solution Approach 1:
The patent employs sensors strategically positioned to measure specific exhaust air parameters (temperature, humidity, CO2) at the critical location where exhaust air is present. By focusing measurement capability only where needed rather than comprehensive environmental monitoring, the system achieves sufficient measurement precision for ventilation control while minimizing sensor quantity and manufacturing cost.
Data Source
AI summary
The application relates to a retrofittable controller (126) according to one embodiment for a building's exhaust air blower (100). The controller comprises a processor unit, a data transfer unit, and a memory unit. The controller further comprises a sensor unit with at least one sensor for measuring the exhaust air arriving at the exhaust air blower, and a control unit which is adapted to regulate operation of a fan motor on the basis of a measurement conducted by the at least one sensor. The controller further comprises a protective housing (125) inside which the controller's units are installed and an attachment element (160) for fastening the controller to a safety cage (102) of the exhaust air blower. The protective housing comprises an air inlet duct, which protrudes therefrom and is intended to be fitted inside the exhaust air blower's safety cage (102), and by means of which a portion of the exhaust air arriving at the exhaust air blower is conducted into the protective housing to be analyzed by the sensor unit.