Dual-Mode Energy Recovery Ventilation for Coordinated Smoke Evacuation
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Solution Overview
Problem
Existing energy recovery ventilation systems in buildings face conflicts and misoperation when smoke is detected, as their operation is independent of other HVAC components, leading to inefficiencies and potential safety issues.
Innovation Solution
A control system integrating smoke sensors to manage energy recovery ventilation systems in two modes: energy recovery when smoke levels are low and smoke evacuation when levels exceed a predetermined value, using algorithms to control ERV wheels, dampers, and fans to optimize smoke removal and maintain building pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If building exhaust fans operate independently of HVAC components, then smoke evacuation can be achieved, but conflicts and misoperation with heating, ventilating and air conditioning system components occur
Solution Approach 1:
The patent combines the exhaust fan operation with the HVAC system control by integrating smoke level sensing and coordinated control logic into the existing HVAC controller. The controller receives smoke level signals and automatically adjusts exhaust fan operation based on smoke conditions, merging previously independent systems into a unified control architecture that eliminates conflicts and misoperation while maintaining effective smoke evacuation.
2Loss of energy
If energy recovery ventilation systems operate in energy recovery mode, then utility expenses are reduced, but smoke evacuation capability is compromised when smoke levels are high
Solution Approach 1:
The patent implements dynamic mode switching in the energy recovery ventilation system based on real-time smoke level detection. The controller automatically transitions between energy recovery mode and smoke evacuation mode depending on smoke conditions, allowing the system to optimize energy efficiency during normal operation while rapidly responding to smoke events by activating high-speed exhaust fans and adjusting damper positions to prioritize smoke removal when needed.
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
The system effectively evacuates smoke while minimizing utility expenses and ensuring occupant safety by seamlessly integrating with existing HVAC components, preventing misoperation and enhancing air quality.
Implementation Method 1
energy recovery wheels rotate between the incoming outdoor air and the building exhaust air. As the wheel rotates, it transfers a percentage of the heat and moisture differential from one airstream to the other
Implementation Method 2
one or more smoke sensors, each configured to measure a level of smoke at a location within a building and to output a smoke level signal based at least in part upon the measured level of smoke
Data Source
AI summary
A control system, comprising one or more smoke sensors, each configured to measure a level of smoke at a location within a building and to output a smoke level signal based at least in part upon the measured level of smoke. A controller configured to receive the smoke level signals and to control an operation of one or more energy recovery ventilation systems in a first mode of operation to recover energy when the smoke level signal is below a predetermined value and in a second mode of operation to evacuate smoke when the smoke level signal is above the predetermined value.