Room ventilation system
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing double-flow ventilation systems require significant modifications to operate safely during a fire for at least thirty minutes, leading to increased costs, bulk, and non-optimized operation in normal mode.
Innovation Solution
A ventilation system with a heat exchanger bypass channel and a shutter device that can distribute fresh air flow between the heat exchanger and bypass channel, allowing the system to maintain safe operation during a fire by ensuring the fresh air outlet temperature remains below a threshold, even when temperatures exceed 180°C, without additional cooling means.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ventilation system is modified to function safely during fire for at least thirty minutes, then the reliability is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The ventilation system is segmented into two separate airflow paths: a normal mode path through the heat exchanger for thermal treatment, and a fire mode path through the bypass duct for direct ventilation. This segmentation allows the system to meet fire safety requirements without modifying the entire system, reducing complexity while improving reliability.
Solution Approach 2:
The shuttering device acts as an intermediary element that directs airflow between the heat exchanger and the bypass duct based on operating conditions. This intermediary mechanism enables the system to switch between normal and fire modes without requiring complex modifications to either path, simplifying the overall system design while ensuring fire safety.
2Reliability
If the ventilation system is modified to function safely during fire, then the reliability is improved, but the manufacturing cost increases
Solution Approach 1:
By segmenting the airflow into separate normal and fire paths, the system avoids the need for expensive fire-resistant modifications to the entire ventilation system. Only the bypass duct and shuttering device need to be implemented, significantly reducing manufacturing costs while ensuring fire safety compliance.
Solution Approach 2:
The fire safety function is extracted from the main heat exchanger system and implemented through a separate bypass duct. This extraction allows the majority of the system to remain unchanged and cost-effective, while only adding the minimal necessary components (bypass duct and shuttering device) to achieve fire safety requirements.
3Reliability
If the ventilation system is modified to function safely during fire, then the reliability is improved, but the system bulk increases
Solution Approach 1:
The bypass duct is designed as a compact segment that utilizes existing system space efficiently. By segmenting the airflow paths and using the shuttering device to switch between them, the system achieves fire safety functionality without requiring a proportional increase in overall system volume.
4Reliability
If the ventilation system is modified to function safely during fire, then the reliability is improved, but the operation in normal mode becomes non-optimized
Solution Approach 1:
The shuttering device serves as a controllable intermediary that directs airflow through the heat exchanger during normal operation, ensuring optimized thermal treatment. The same shuttering device can quickly redirect airflow to the bypass duct during fire conditions, maintaining normal mode efficiency while enabling fire safety operation.
Solution Approach 2:
The system incorporates a dynamic shuttering device that can adjust airflow distribution between the heat exchanger and bypass duct based on operating conditions. This dynamic capability ensures optimal performance in normal mode while providing rapid response for fire safety requirements, preventing any degradation of normal operation efficiency.
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 continuous ventilation during a fire for at least thirty minutes while maintaining optimized operation in normal mode, reducing bulk and eliminating the need for dedicated cooling, ensuring efficient and safe air handling.
Implementation Method 1
a heat exchanger for thermal exchange between the fresh air flow and the stale air flow, in order to thermally treat the fresh air flow before it enters the room
Implementation Method 2
a supply fan for an airflow from outside the room to the room, referred to as the fresh airflow
Implementation Method 3
an exhaust fan for an airflow from the room to the outside, referred to as the stale airflow
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention relates to a room ventilation system (1), comprising a box having a supply fan for a fresh air flow, and an exhaust fan for a stale air flow, a heat exchanger for heat exchange between the fresh air flow and the stale air flow and a bypass channel (13) of the heat exchanger, the ventilation system (1) comprising a shut-off device for distributing the fresh air flow between the heat exchanger (E) and the channel (13), the device (14) being movable to occupy a plurality of positions, and the system (1) being configured so that, when a temperature measured at the fresh air outlet is greater than or equal to a threshold value, the device (14) occupies a position, so that a temperature measured at the fresh air outlet is less than or equal to a temperature equal to a sum of a fresh air inlet temperature and a value of 180°C.