Heat exchanging ventilation device
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Solution Overview
Problem
Conventional heat exchange ventilators continue normal ventilation operations even when the air-conditioning effect is small, leading to unnecessary energy consumption for fan operation and air conditioning, and fail to adjust humidity effectively.
Innovation Solution
A control unit that reduces fan air volume during low indoor air state changes and switches from normal to heat exchange ventilation when the indoor air state change is below a threshold, optimizing operations based on temperature differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If normal ventilation operation is continued based on instantaneous temperature comparison, then ventilation capacity is maintained, but energy consumption increases unnecessarily when air-conditioning effect is small
Solution Approach 1:
The control unit continuously monitors indoor temperature changes and uses this feedback to dynamically adjust fan operation mode. When temperature change exceeds threshold, normal ventilation is activated; when below threshold, heat exchange ventilation is activated, creating a closed-loop control system that optimizes energy consumption based on actual cooling/heating needs
Solution Approach 2:
The system dynamically switches between two operational modes (normal ventilation and heat exchange ventilation) based on real-time temperature conditions. This dynamic adaptation allows the fan to operate at appropriate capacity levels, avoiding unnecessary high-speed operation when minimal ventilation is sufficient
2Productivity
If normal ventilation operation is continued, then ventilation capacity is maintained, but air-conditioning load increases when temperature difference is small
Solution Approach 1:
The control unit uses feedback from temperature sensors to determine when air conditioning is actually needed. By monitoring whether indoor temperature change exceeds the threshold, the system avoids unnecessary air conditioning operation when outdoor air temperature is already close to indoor temperature, thereby reducing air conditioning energy consumption
Solution Approach 2:
The system changes the operational parameter (ventilation mode) based on temperature difference parameters. When the temperature difference between indoor and outdoor air is small (below threshold), the system switches to heat exchange mode which maintains ventilation capacity while eliminating the need for additional air conditioning energy input
3Use of energy by moving object
If heat exchange ventilation is used, then energy consumption is reduced, but ventilation capacity decreases compared to normal ventilation
Solution Approach 1:
The system dynamically selects the appropriate ventilation mode based on real-time temperature conditions. During periods when temperature difference is large (below threshold), heat exchange ventilation provides sufficient capacity at lower energy consumption. When temperature difference is large (above threshold), normal ventilation is activated to provide maximum ventilation capacity, thus balancing energy efficiency with ventilation requirements throughout the day
4Ease of operation
If switching is based on instantaneous temperature comparison, then control simplicity is maintained, but accuracy of operation switching deteriorates
Solution Approach 1:
The control unit compares temperature changes over a predetermined time period rather than relying on instantaneous values. This preliminary action of accumulating temperature data over time filters out transient fluctuations and provides a more accurate basis for switching decisions, improving measurement precision while maintaining straightforward control logic
Solution Approach 2:
The system uses continuous temperature monitoring feedback to determine switching timing. By base switching decisions on accumulated temperature change data rather than single-point measurements, the feedback mechanism provides more reliable information for control decisions, enhancing the precision of operation switching
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 minimizes energy consumption by reducing fan energy use during small temperature changes and prevents unnecessary air conditioning operation, enhancing energy efficiency and humidity adjustment.
Implementation Method 1
a heat exchanger for heat transfer between the air exchange streams
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
A conventional heat exchange ventilator switches between a heat exchange ventilation operation and a normal ventilation operation based on a result of comparison between an instantaneous value of an outdoor temperature and an instantaneous value of an indoor temperature. Therefore, it has been disadvantageous in that the normal ventilation operation is continued even when air-conditioning effect of the normal ventilation operation is small, thereby wasteful energy being consumed. The invention makes an air volume of a fan smaller than that during the normal ventilation operation, or switches from the normal ventilation operation to the heat exchange ventilation operation, when an amount of change in a state of the indoor air with time, detected during the normal ventilation operation, is smaller than a set threshold. According to the heat exchange ventilator of the invention, when the air-conditioning effect is small, the normal ventilation operation is not continued, and wasteful energy is prevented from being consumed.