Barometric Zone Damper for HVAC Static Pressure Relief
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Solution Overview
Problem
Conventional HVAC zoning systems face inefficiencies due to the use of bypass dampers, which are energy-intensive and costly to install and maintain, as they attempt to alleviate excess static duct pressure through air recycling.
Innovation Solution
The introduction of barometrically responsive zone dampers that include a mechanical portion responsive to pressure differentials, allowing conditioned air to be bled into zones when static pressure increases, eliminating the need for bypass dampers by adjusting to maintain optimal pressure levels using adjustable counterbalance weights and coupling mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If bypass dampers are used to relieve excess static duct pressure, then static pressure control is improved, but energy efficiency deteriorates and system cost increases
Solution Approach 1:
The patent extracts the barometric relief function from the traditional bypass damper system and integrates it directly into the zone damper assembly. This allows the zone damper to automatically relieve excess static pressure through a relief opening when barometric pressure differential exceeds a set point, eliminating the need for separate bypass dampers and their associated energy waste from air recycling.
Solution Approach 2:
The zone damper assembly becomes self-regulating by incorporating a barometric pressure differential sensor and relief mechanism. When static pressure exceeds acceptable levels, the system automatically opens the relief opening to bleed off excess pressure without requiring external control systems or energy input, making the system self-service for pressure management.
2Stress or pressure
If bypass dampers are installed to control static pressure, then pressure regulation is improved, but device complexity and installation cost increase
Solution Approach 1:
The patent merges the barometric relief function with the zone damper assembly into a single integrated unit. The relief opening, barometric pressure differential sensor, and relief control mechanism are combined with the existing zone damper components, eliminating the need for separate bypass damper installations and reducing overall system complexity.
3Measurement precision
If zone dampers close completely when zone temperature is satisfied, then zone control precision is improved, but static pressure in duct system increases
Solution Approach 1:
The patent implements partial action by providing a relief opening in the zone damper assembly that allows a controlled amount of air to bypass the damper blade when barometric pressure differential exceeds the set point. This partial opening maintains zone temperature control precision while preventing excessive static pressure buildup in the duct system.
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
This solution reduces drafts, noise, and energy consumption by managing static pressure within HVAC systems more efficiently, eliminating the need for bypass dampers and associated costs, while enhancing system performance and reducing the risk of coil freeze-up.
Implementation Method 1
a mechanical portion responsive to the barometric pressure differential in the system to open and bleed a small amount of conditioned air into each zone when the static pressure of the system increases above a selected level
Implementation Method 2
the second portion of the zone damper can include a counter balance weight, which may be adjustable, to set the desired static pressure differential value that will be allowed
Data Source
AI summary
A control system for an HVAC system serving at least two zones, each zone receiving conditioned air by way of a zone duct, each zone duct including a zone damper having a first portion responsive to the static pressure in a HVAC system to open and bleed an amount of conditioned air past the damper when the static pressure of the system increases above a selected level, a second portion controlled by a actuator to move between an open and a closed position in response to a zone thermostat, and a coupling mechanism coupling the first and second portions to limit the relative movements of the two portions with respect to each other, and a biasing mechanism exerting a torque against the system static pressure differential. The first portion can be a single one-piece undivided blade pivotally mounted with a shell surrounding the zone damper.