Heat Recovery Ventilation Control With Intermittent Forced Airflow
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Solution Overview
Problem
Conventional ventilators for living rooms do not consider power consumption during forced ventilation operations, leading to inefficient energy conservation.
Innovation Solution
The ventilator includes an air supply fan, an exhaust fan, and a total heat exchanger, with a controller that intermittently operates both fans during forced ventilation, allowing for adjustable ventilation amounts and varying airflow rates to optimize power usage and heat exchange efficiency based on temperature sensing units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fans operate continuously during forced ventilation operation, then ventilation amount is sufficient, but power consumption is high
Solution Approach 1:
The control unit operates the air supply fan and exhaust fan in an intermittent periodic manner during forced ventilation operation, switching between operation and stop states. This periodic action reduces power consumption while still achieving the required ventilation amount over time, directly resolving the contradiction between continuous operation (high productivity) and intermittent operation (low energy consumption).
2Temperature
If total heat exchanger operates at high efficiency, then air temperature is close to exhaust air temperature, but power consumption increases
Solution Approach 1:
The total heat exchanger operates periodically by switching between heat exchange operation and stop states. During operation, it efficiently temperatures the supply air close to exhaust air temperature. During stop periods, power consumption is eliminated. This periodic operation resolves the contradiction between maintaining high temperature efficiency and reducing energy consumption.
Solution Approach 2:
The system dynamically adjusts the operation state of the total heat exchanger based on real-time temperature conditions. When the temperature difference between supply air and exhaust air is large, heat exchange operation is activated. When the difference is small or ventilation priority is needed, operation is stopped. This dynamic adaptation resolves the contradiction between temperature efficiency and power consumption.
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
This approach reduces power consumption during forced ventilation operations while maintaining the required ventilation levels, and allows for adaptive heat exchange efficiency to control air temperature effectively.
Implementation Method 1
a total heat exchanger (22) having a supply air channel through which the supply air flows, and an exhaust air channel through which the exhaust air flows
Data Source
Figure 1(A)~1(B)
Figure 2(A)~2(B)
Figure 3
AI summary
A total heat exchanger unit (1) includes a controller (2) for, upon receipt of a stop signal for stopping optional ventilation operation, terminating the optional ventilation operation and starting forced ventilation operation, and upon receipt of a start signal for starting the optional ventilation operation, terminating the forced ventilation operation and starting the optional ventilation operation. The controller (2) allows intermittent operation of an air supply fan (20) and an exhaust fan (21) during the forced ventilation operation.