Ventilation system
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Solution Overview
Problem
Conventional ventilation systems are not capable of supplying heat-exchanged air to multiple areas or adjusting airflow quantities for each area effectively.
Innovation Solution
A ventilation system with a refrigerant circuit, multiple air supply fans, and a control unit that adjusts fan speeds to distribute heat-exchanged air across multiple areas, utilizing sensors for airflow detection and control to balance airflow and heat recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single casing houses the air supply fan, exhaust fan, and heat exchanger, then the device structure is simple and manufacturing cost is low, but the system cannot supply heat-exchanged air to multiple areas or adjust airflow for each area
Solution Approach 1:
The patent divides the air supply function into multiple independent air supply fans (first air supply fan, second air supply fan, etc.), each capable of independently controlling airflow to different areas. This segmentation allows the system to supply heat-exchanged air to multiple areas with adjustable airflow for each area, resolving the contradiction between adaptability and device complexity.
2Ease of operation
If multiple air supply fans are introduced to supply air to multiple areas, then airflow adjustment for each area is enabled, but the device complexity and control system complexity increase
Solution Approach 1:
The patent introduces airflow detectors (first air supply detector, second air supply detector, etc.) that detect the airflow quantities from each air supply fan and provide feedback to the control unit. The control unit adjusts the rotational speeds of the fans based on this feedback to achieve the desired airflow distribution, enabling automated control that reduces operational complexity despite having multiple fans.
Solution Approach 2:
The patent employs variable speed control for each air supply fan, allowing the rotational speed of each fan to be dynamically adjusted according to the required airflow for each area. This dynamic control capability enables flexible airflow adjustment while maintaining systematic coordination through the control unit.
3Measurement precision
If airflow detectors are added to each air supply path, then precise airflow control is achieved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent places airflow detectors in each air supply path (first air supply detector for first air supply fan, second air supply detector for second air supply fan, etc.), segmenting the measurement function to match the segmented air supply structure. This allows precise monitoring of airflow in each path, enabling accurate control while maintaining consistency with the overall segmented architecture.
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
Enables adjustable airflow distribution to multiple areas, improving indoor environments by managing CO2 concentrations and heat recovery, while reducing manufacturing costs through distributed control processing.
Implementation Method 1
a heat exchanger, a supply air path and exhaust air path that allow the inside and outside of a target space to communicate with each other via the heat exchanger
Implementation Method 2
an air supply fan that supplies air outside the target space to the target space via the supply air path
Implementation Method 3
an exhaust fan that exhausts air in the target space to the outside of the target space via the exhaust air path
Data Source
AI summary
The ventilation system 1 according to the present disclosure includes: a refrigerant circuit 60; an air supply path having an interior in which a first heat exchanger 12 and a first air supply fan 22A and a second air supply fan 22B are arranged; an exhaust air path having an interior in which a second heat exchanger 32 and an exhaust fan 42 are arranged; a first air supply detector 23A for detecting a first supply airflow AF1 blown out by the first air supply fan 22A; a second air supply detector 23B for detecting a second supply airflow AF2 blown out by the second air supply fan 22B; and a control unit CU. The control unit CU executes first air supply control to adjust the rotational speed of the first air supply fan 22A so that the first supply airflow AF1 becomes a target value TV1, and second air supply control to adjust the rotational speed of the second air supply fan 22B so that the second supply airflow AF2 becomes a target value TV2.