Energy Recovery Ventilation Mode Switching for Smoke Evacuation
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Solution Overview
Problem
Existing energy recovery ventilation systems in buildings face operational conflicts and mismanagement 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 threshold, using algorithms to control ERV wheels, dampers, and fans to optimize smoke removal while maintaining 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 HVAC components occur
Solution Approach 1:
The patent integrates the exhaust fan control into the HVAC system's central control architecture, merging previously independent smoke evacuation functionality with the existing HVAC control infrastructure. This allows coordinated operation of exhaust fans with other HVAC components through a unified control system that processes smoke detector signals and manages fan operation in conjunction with heating, cooling, and ventilation functions.
2Loss of energy
If energy recovery ventilation systems operate continuously, then energy recovery efficiency is maximized, but smoke evacuation capability is reduced
Solution Approach 1:
The patent implements dynamic control of the energy recovery ventilation system that automatically adjusts operational mode based on environmental conditions. The system transitions between energy recovery mode (under normal conditions) and smoke evacuation mode (when smoke detectors activate), with the control system modifying fan speeds, damper positions, and airflow paths in real-time to prioritize smoke removal when needed while maintaining energy efficiency during normal operation.
3Measurement precision
If smoke sensors are integrated into the control system, then smoke detection accuracy improves, but system complexity increases
Solution Approach 1:
The patent leverages existing multi-functional components within the HVAC control system to handle smoke detection and response. The central controller that already manages heating, cooling, and ventilation functions is extended to process smoke detector signals and coordinate exhaust fan operation, eliminating the need for separate dedicated control hardware and reducing overall system complexity while maintaining accurate smoke detection capabilities.
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 and efficiently evacuates smoke from buildings while minimizing utility expenses and ensuring occupant safety by seamlessly integrating with existing HVAC components, preventing misoperation and enhancing air quality.
Implementation Method 1
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
Implementation Method 2
controls the operation of one or more energy recovery ventilation systems in a first mode of operation to recover energy
Implementation Method 3
in a second mode of operation to evacuate smoke when the smoke level signal is above the predetermined value
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.