ERV Pressure-Based Ventilation Control Without Economizer Interface
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Solution Overview
Problem
Commercial HVAC systems face energy losses due to air exchange, as fresh air needs to be conditioned to match indoor temperatures, and existing solutions for balancing fresh air requirements between energy recovery ventilators and economizers involve costly interfacing and potential failure points.
Innovation Solution
The implementation of a Global Pressure Demand Control (GPDC) mode in energy recovery ventilators, which uses pressure transducers and controllers to maintain internal air pressure at atmospheric levels, allowing the ERV to operate autonomously and balance fresh air requirements without electrical communication with the economizer, thus eliminating the need for additional hardware and interface standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrical communication and interfacing are used between ERV and economizer to balance fresh air requirements, then fresh air demand can be coordinated, but system complexity increases and potential failure points are introduced
Solution Approach 1:
The patent extracts the communication interface between ERV and economizer by implementing autonomous pressure-based control in the ERV. The ERV independently senses building pressure and adjusts fresh air intake without electrical communication with the economizer, removing the problematic interfacing layer while maintaining coordinated operation through shared physical environment sensing
Solution Approach 2:
The ERV system performs self-service by autonomously sensing building static pressure through pressure transducers and automatically adjusting its fresh air intake accordingly. This self-regulating mechanism eliminates dependency on external control signals from the economizer, reducing system complexity and potential failure points while maintaining reliable operation
2Ease of operation
If additional hardware and interface standards are implemented for ERV-economizer communication, then fresh air balancing is achieved, but cost and maintenance requirements increase
Solution Approach 1:
The patent removes the need for additional communication hardware and interface standards by implementing autonomous pressure-based control. The ERV uses built-in pressure transducers to sense building pressure and independently adjusts fresh air intake, extracting the problematic communication layer while maintaining effective fresh air balancing through environmental feedback
Solution Approach 2:
The pressure transducer serves multiple functions: it senses building static pressure, provides feedback for autonomous control, and enables fresh air balancing without requiring dedicated communication hardware. This multi-functionality reduces hardware requirements while achieving the same operational goal
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 approach reduces energy losses by optimizing air flow and meeting fresh air demands without additional infrastructure, enhancing the efficiency and reliability of HVAC systems while avoiding costly interfacing and maintenance issues.
Implementation Method 1
A pressure transducer is configured to determine internal air pressure within the enclosure
Implementation Method 2
The first blower is configured to direct a first air stream into a first zone of the enclosure
Implementation Method 3
A second blower is configured to direct a second air stream into a second zone of the enclosure
Implementation Method 4
A controller is configured to control the first blower and/or the second blower in response to the internal air pressure
Data Source
AI summary
An energy recovery ventilator includes first and second blowers, a pressure transducer and a controller. The first blower is configured to direct a first air stream into a first zone of an enclosure. A second blower configured to direct a second air stream into a second zone of the enclosure. A pressure transducer is configured to determine internal air pressure within the enclosure. A controller is configured to control the first blower and/or the second blower in response to the internal air pressure.