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Demand Control Ventilation (DCV)

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Demand Control Ventilation (DCV)

DVC is an intelligent ventilation method that ensures good indoor air quality, saves energy and consists of sensors, controllers and ventilation fans. DCV is not constrained by air tightness levels, so it is suitable for all house types and all ages, new builds and retrofits.


Demand Control Ventilation (DCV)

The sensors continuously measure and monitor indoor air quality and provide realtime feedback to the controller. The controller conveys the sensor information to the fans adjusting the rate according to what is happening in each room.

The extract fans, which are barely audible, are placed in the attic spaces or utility rooms and are connected via ducts to extract grills in the kitchen, bathrooms and utility room.  Air. Ones into the house through passive or humidity sensitive vents or window vents.

  • Low electrical running costs (from 0.27-0.5 W/l/s).
  • No need for filter changes.
  • Quiet operation.
  • Continuous demand driven extract ventilation.
  • No occupier interface required.
  • Humidity sensitive strips with 30 year guarantee.


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 How Demand Control Ventilation Works:

  1. Occupancy Sensing: DCV systems use occupancy sensors to detect the number of people present in a space. These sensors can be infrared, ultrasonic, or other technologies that can accurately determine occupancy levels.
  2. Indoor Air Quality Monitoring: Some DCV systems also incorporate sensors that measure indoor air quality parameters such as carbon dioxide (CO2), volatile organic compounds (VOCs), and humidity. Elevated levels of these pollutants can indicate a need for increased ventilation.
  3. Control Logic: The DCV system processes data from occupancy sensors and indoor air quality sensors to determine the appropriate ventilation rate. When occupancy is high or IAQ deteriorates, the system increases the ventilation rate. Conversely, when occupancy is low and IAQ is acceptable, the system decreases the ventilation rate.
  4. Variable Airflow Rates: The ventilation system modulates the operation of fans, dampers, or vents to adjust the amount of fresh outdoor air supplied based on real-time conditions.

Benefits of Demand Control Ventilation:

  1. Energy Savings: DCV optimizes energy consumption by providing ventilation only when necessary. This reduces over-ventilation during low-occupancy periods, minimizing energy waste.
  2. Improved Indoor Air Quality: By adjusting ventilation rates based on occupancy and IAQ conditions, DCV systems ensure that indoor air quality is maintained at acceptable levels.
  3. Health and Comfort: Properly controlled ventilation contributes to occupant health, comfort, and well-being by providing fresh air without overworking HVAC systems.
  4. Regulatory Compliance: DCV can help buildings meet ventilation standards and codes while minimizing energy use.
  5. Reduced Operating Costs: Energy savings resulting from DCV can lead to lower operating costs for buildings.
  6. Environmental Impact: Reduced energy consumption translates to a lower carbon footprint and a positive impact on the environment.
  7. Adaptability: DCV systems can be integrated with existing HVAC systems and can be adjusted based on changing occupancy patterns and indoor conditions.
  8. Zoned Ventilation: DCV allows for zoned ventilation, adjusting ventilation rates based on occupancy in different areas of a building.

10 STEPS TO INSTALLING Energy Recovery Ventilation (ERV) and Heat Recovery Ventilation (HRV)

1. System Design and Sizing:

  • Calculate the ventilation requirements based on the building's size, occupancy, and local codes.
  • Determine the appropriate ERV/HRV unit size based on the calculated ventilation needs and the expected heat recovery efficiency.

2. Site Selection and Ductwork Planning:

  • Choose a suitable location for installing the ERV/HRV unit. Typically, this should be a central location with easy access to both indoor and outdoor air intakes and exhausts.
  • Design the ductwork layout for air distribution, considering supply and exhaust connections to various rooms and areas in the building.
  • Plan the route for the outdoor and exhaust ducts to ensure optimal airflow and minimize obstructions.

3. Duct Installation and Outdoor and Exhaust Vent Installation:

  • Install the ductwork according to the planned layout, making sure to insulate the ducts properly to prevent heat loss or gain.
  • Install outdoor air intake and exhaust vents. The outdoor air intake should be placed in a location with minimal outdoor pollutants, and the exhaust vent should direct stale air away from the building.

4. ERV/HRV Unit Installation:

  • Mount the ERV/HRV unit on a stable surface in the chosen location. Make sure to follow the manufacturer's guidelines for clearances and installation instructions.

5. Electrical Wiring and Duct Connection:

  • Connect the ERV/HRV unit to the electrical supply following the manufacturer's instructions. This includes connecting the unit to power and any necessary control wiring.
  • Connect the supply and exhaust ducts to the appropriate ports on the ERV/HRV unit. Ensure proper sealing to prevent air leaks.

6. Condensate Drainage and Controls and Settings:

  • If your system includes a condensate drain, ensure that it is properly connected to the ERV/HRV unit and that it drains away from the unit and the building's foundation.
  • Set up the controls for the ERV/HRV system, including setting desired ventilation rates, fan speeds, and other parameters.

4. Balancing and Testing and Insulation and Sealing:

  • Once the system is installed, balance the airflow by adjusting dampers and registers to ensure even air distribution throughout the building.
  • Perform system tests to ensure that the ERV/HRV unit is functioning properly and effectively transferring heat or moisture.
  • Insulate any exposed ducts to prevent heat loss or gain and ensure efficient energy recovery.
  • Seal all duct connections, joints, and openings to prevent air leaks that could compromise system efficiency.

4. Maintenance and Operation Instructions:

  • Provide the building owner with information about proper operation, maintenance, and cleaning of the ERV/HRV system. This includes regular filter replacement and cleaning to ensure optimal performance.

4. Compliance and Inspection:

  • Ensure that the installation complies with local building codes and regulations.
  • If required, schedule inspections to verify the installation's compliance and safety.

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