HVAC Pressure-Based Detection for Open Door and Window Control
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Solution Overview
Problem
Existing HVAC systems lack efficient and cost-effective methods to detect open windows or doors, leading to unnecessary heating or cooling, and require costly sensor installations.
Innovation Solution
A tubeless and wireless system that measures differential air pressures using MEMS-based absolute pressure sensors, applying algorithms to detect open doors or windows, and adjusts HVAC operations accordingly, with integrated calibration and communication protocols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If individual sensors are installed to detect open windows or doors, then detection accuracy is improved, but system cost and installation complexity increase
Solution Approach 1:
The patent combines multiple sensing functions (pressure detection, temperature sensing, humidity sensing, and communication capabilities) into a single integrated HVAC controller unit. This eliminates the need for separate door/window sensors and their associated wiring, reducing installation complexity while maintaining detection accuracy through the pressure-based sensing mechanism.
Solution Approach 2:
The HVAC controller is designed to perform multiple functions: it controls heating and cooling operations, monitors indoor environmental conditions (temperature, humidity), detects open doors or windows through pressure differential sensing, and communicates with remote devices. This multi-functional approach replaces what would traditionally require multiple separate devices.
2Measurement precision
If traditional sensor systems are used to detect open doors or windows, then detection capability is improved, but system cost increases
Solution Approach 1:
The HVAC controller leverages its existing multi-functionality to include pressure-based door/window detection without requiring additional expensive specialized sensors. The same controller that manages climate control also monitors pressure differentials to detect open doors or windows, eliminating the need for separate detection systems.
Solution Approach 2:
The system uses the HVAC controller's own pressure sensing capabilities to detect open doors or windows, rather than requiring external sensors. The controller monitors pressure differentials across the building envelope and interprets these changes as indicators of open doors or windows, making the system self-sufficient.
3Reliability
If multiple sensors are installed throughout the system, then monitoring coverage is improved, but maintenance requirements and costs increase
Solution Approach 1:
By consolidating detection, control, and communication functions into a single HVAC controller unit, the system reduces the total number of components that require maintenance. Instead of maintaining multiple separate sensors and their wiring infrastructure, only the integrated controller needs maintenance, simplifying the maintenance regimen while preserving monitoring coverage.
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
Accurately detects open doors or windows, optimizing HVAC operation to save energy by halting heating or cooling when necessary, while maintaining low installation and maintenance costs.
Implementation Method 1
measures differential air pressures at several different indoor points relative to outside air
Data Source
AI summary
A substantially tubeless and wireless system accurately measures differential air pressures at several different indoor points relative to outside air. In some embodiments, individual units (e.g., receivers and/or zone transmitters) apply an algorithm to derive the air pressure in the space in which the unit is installed. If the derived pressure is at or near the outside pressure, the unit starts a counter to measure the length of time the equalized pressure condition exists. If the condition persists longer than the time it takes to egress or ingress through a door or to open and close a window, a flag signal is sent to the unit. The unit then takes action to halt cooling or heating in the space. In some embodiments, the unit may be a thermostat, or HVAC controlling device or cloud acting as a HVAC controller. Notification to the end user of the action taken may be provided on the thermostat panel or through a mobile application or other available source.