Demand control ventilation system with commissioning and checkout sequence control
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Solution Overview
Problem
Existing HVAC systems, particularly demand control ventilation (DCV) and economizer systems, often lack proper setup and calibration during commissioning, leading to inefficient energy usage and potential operational issues due to the complexity of the commissioning process.
Innovation Solution
The implementation of a DCV and economizer system that includes automated commissioning and verification processes, using a controller to store settings and parameters during commissioning, allowing for remote monitoring and manual control of hardware components like dampers, and enabling self-testing to ensure proper system function.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a DCV and economizer system is implemented with manual commissioning processes, then the system can provide demand control ventilation and energy savings, but the commissioning process becomes complicated and time-consuming
Solution Approach 1:
The system performs self-testing and self-verification during commissioning. The controller automatically executes test sequences that operate dampers, fans, and sensors, then verifies their functionality without requiring external intervention for each test component.
Solution Approach 2:
The system stores commissioning settings and parameters in memory before final system operation. This preliminary storage of configuration data allows the system to be pre-configured with desired operating parameters, ventilation rates, and control settings prior to actual HVAC operation.
2Reliability
If comprehensive system testing and verification are performed during commissioning, then system reliability is improved, but the commissioning time and complexity increase
Solution Approach 1:
The system performs continuous self-testing during normal operation rather than requiring separate dedicated test periods. The controller periodically executes diagnostic routines that verify sensor accuracy, damper positioning, and fan operation without interrupting HVAC service, making the testing continuous and integrated into regular operation.
Solution Approach 2:
The system provides feedback through alerts and notifications when test failures are detected or when commissioning is incomplete. The controller monitors test results and communicates status to building operators, enabling timely correction of issues and verification of proper system setup.
3Ease of operation
If automated commissioning sequences are implemented, then ease of commissioning is improved, but device complexity increases
Solution Approach 1:
The system replaces manual mechanical commissioning procedures with automated electronic control sequences. The controller electronically manages damper actuation, fan speed control, and sensor verification through programmed sequences, substituting manual mechanical adjustments with automated electronic commissioning routines.
4Loss of information
If system settings and parameters are stored for later verification, then ability to verify proper commissioning is improved, but memory and data management requirements increase
Solution Approach 1:
The system extracts and stores only the essential commissioning parameters and test results in memory. Rather than storing all possible operational data, the controller selectively saves critical commissioning information such as damper positions, sensor calibrations, and test outcomes that are necessary for verifying proper system setup.
Data Source
AI summary
The disclosure relates to a Demand Control Ventilation (DCV) and/or Economizer system that is capable of drawing outside air into an HVAC air stream. In some instances, the DCV and/or Economizer system may be configured to help perform one or more system checks to help verify that the system is functioning properly. In some instances, the DCV and/or Economizer system may provide some level of manual control over certain hardware (e.g. dampers) to help commission the system. The DCV and/or Economizer system may store one or more settings and or parameters used during the commissioning process (either in the factory or in the field), so that these settings and/or parameters may be later accessed to verify that the DCV and/or Economizer system was commissioned and commissioned properly.