CO2 Monitoring & Demand
Controlled Ventilation Design
CO2 monitoring and demand-controlled ventilation (DCV) system design for offices, schools, meeting rooms and public spaces — NDIR sensor placement, BMS integration, energy savings and ASHRAE 62.1 / LEED EQ compliance.
What We Offer
Demand-Controlled Ventilation (DCV) is one of the highest-impact strategies for simultaneously improving indoor air quality and reducing HVAC energy consumption. By measuring CO2 as a proxy for occupancy, DCV systems deliver exactly the amount of fresh air required — eliminating both under-ventilation (poor air quality) and over-ventilation (wasted energy).
ASDV Consultant designs CO2 monitoring and DCV systems for offices, conference rooms, classrooms, retail spaces, gymnasiums, auditoriums and any high-density occupancy spaces. Our designs specify NDIR (non-dispersive infrared) CO2 sensors — the gold standard for accuracy and long-term stability — at optimal positions to measure representative breathing-zone CO2 levels.
CO2 sensor outputs are integrated with BMS to modulate AHU fresh air dampers and VAV system minimum airflow setpoints based on real-time CO2 readings. This approach typically achieves 20–40% ventilation energy savings while maintaining or improving indoor air quality compared to fixed-ventilation designs.
Why Choose ASDV?
- Certified ELV design consultants with 10+ years experience
- AutoCAD & Revit BIM deliverables for seamless coordination
- Full compliance with Indian & international standards
- Transparent pricing with detailed BOQ and specifications
- Pan-India service with international project capability
Design Deliverables
CO2 Sensor Placement Drawings
Plans showing NDIR sensor positions at breathing height, cable routes and control zone boundaries.
DCV Control Sequence
Written sequence of operations defining CO2 setpoints, damper modulation logic and alarm escalation.
BMS Integration Design
CO2 sensor interface to BMS/DDC controllers, AHU damper actuators and VAV terminal units.
Bill of Quantities
Itemised NDIR sensors, transmitters, cabling and BMS integration hardware.
Technical Specifications
NDIR sensor specifications including accuracy, range (0–5000 ppm), self-calibration and maintenance requirements.
LEED/ASHRAE Compliance
DCV design compliance matrix for LEED EQ credit and ASHRAE 62.1 CO2-based ventilation control.
What's Included
Our Design Process
Ventilation System Review
Review HVAC design — AHU types, VAV layout, zone configuration — to define DCV integration points.
CO2 Sensor Placement
Position NDIR sensors at breathing height (1.1–1.5m AFF) in occupied zones, away from supply diffusers and windows.
DCV Control Logic
Define CO2 setpoints (typically 1000–1100 ppm), damper modulation curves, minimum OA limits and high-CO2 alarm thresholds.
BMS Integration Design
Design DDC controller I/O for CO2 sensor inputs and AHU/VAV actuator outputs with communication protocol specification.
BOQ & Specifications
Produce itemised BOQ and technical specifications.
Commissioning & Calibration
Witness sensor calibration, DCV function testing and LEED documentation.
Standards & Codes We Design To
Frequently Asked Questions
DCV automatically adjusts the amount of outdoor air delivered to a space based on real-time occupancy — typically measured via CO2 sensors. When a space is fully occupied and CO2 rises, the AHU increases fresh air supply. When unoccupied and CO2 drops, the system reduces fresh air to a minimum setpoint. DCV prevents both over-ventilation (energy waste) and under-ventilation (poor air quality).
NDIR (non-dispersive infrared) CO2 sensors measure CO2 absorption of infrared light — providing high accuracy (±30–50 ppm), long-term stability (years of reliable operation), and minimal maintenance (auto-calibration via ABC logic). Alternative electrochemical sensors drift significantly over time and require frequent recalibration, making them unsuitable for DCV control applications.
Studies show DCV achieves 20–40% ventilation energy savings compared to fixed minimum outdoor air rates in buildings with variable occupancy (offices, schools, conference rooms). Savings are highest in spaces with wide occupancy fluctuations. ASHRAE 90.1 mandates DCV for spaces with design occupancy above 25 people per 1000 sq ft and outdoor air fraction above 10%.
Need a CO2 Monitoring & DCV Design?
Contact ASDV Consultant for an energy-saving DCV design with NDIR sensor layout, BMS integration and BOQ.