Remote DCV Damper Calibration for Outside Air Control
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Solution Overview
Problem
Demand control ventilation (DCV) and economizer systems in HVAC systems often go uncalibrated or become less optimal over time due to changing environmental conditions, requiring costly and inconvenient on-site visits for maintenance and calibration.
Innovation Solution
A demand control ventilation device with a damper and controller, along with a remote monitoring device, allows for automatic and continuous calibration, enabling remote monitoring and control of outside air flow, system parameter adjustments, and fault alerts, reducing the need for physical visits to the air handling unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DCV systems are manually calibrated during commissioning, then initial system performance is achieved, but calibration becomes suboptimal over time as environmental conditions change
Solution Approach 1:
The DCV system performs automatic self-calibration by utilizing the temperature difference between return air and outside air to determine damper positions. The controller continuously monitors temperature sensors and automatically adjusts dampers to achieve desired ventilation rates, eliminating the need for manual recalibration by technicians.
Solution Approach 2:
The system continuously monitors environmental conditions (return air temperature, outside air temperature) and uses this feedback to automatically adjust damper positions. The controller compares actual conditions with target conditions and makes real-time adjustments to maintain optimal system performance.
2Loss of information
If technicians physically visit the air handling unit for monitoring and calibration, then system status can be verified, but installation and maintenance become inconvenient and costly
Solution Approach 1:
The system uses temperature sensors and a controller as intermediaries to remotely monitor and control DCV system performance. Instead of requiring physical access to the air handling unit, technicians can monitor system status and perform calibration through remote interfaces, making the system accessible without physical presence.
Solution Approach 2:
The patent replaces manual mechanical calibration procedures with an automated electronic control system. The controller uses electronic sensors to detect temperature differences and automatically adjusts dampers, replacing the need for manual mechanical adjustment by technicians.
3Loss of energy
If economizer systems are properly calibrated, then energy efficiency is optimized, but the calibration process is complicated and time-consuming
Solution Approach 1:
The economizer system automatically determines optimal damper positions by measuring temperature differences between return air and outside air. The controller performs calculations and adjusts dampers without requiring technician intervention, simplifying the calibration process while maintaining energy efficiency.
Solution Approach 2:
The system uses temperature as a key parameter to determine damper positions. By monitoring temperature changes and using these parameter variations to automatically adjust system operation, the calibration process becomes straightforward based on natural environmental variations rather than complex manual procedures.
Data Source
AI summary
Methods and systems for remotely monitoring and/or controlling a demand control ventilation system are disclosed. In one illustrative embodiment, a demand control ventilation device having a damper and a controller are provided. The damper may have a range of damper positions for controlling a flow of outside air into the building. The controller controls the damper positions such that a desired flow of outside air is drawn through the damper and into the building. A remote monitoring device may also be provided. The remote monitoring device may be located remotely from the demand control ventilation device, but in communication with or part of the controller. In some instances, the remote monitoring device may have a user interface for remotely monitoring and/or controlling at least certain aspects of the demand control ventilation system from the remote location.