The document discusses demand-controlled ventilation (DCV) as a solution for reducing energy waste in conventional ventilation systems, which are often based on maximum occupancy and constant fresh air intake. DCV adjusts fresh air intake according to occupancy levels and CO2 concentration, leading to significant energy savings and improved indoor air quality. The benefits include compliance with ASHRAE standards, support for LEED certification, and applicability in various building types such as offices, hospitals, and theaters.

1. D
Demand
C
Controlled
V
Ventilation
for Energy Savings

2. Conventional Ventilation
Ventilation is typically based on:
• Maximum occupancy (worst-case scenario)
• Constant intake of fresh air (even if unoccupied)
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3. The Result
• Significant waste of energy and money
• Excess running of fans
• Excess heating of cold intake air
• Excess cooling of warm intake air

4. Demand-Controlled Ventilation (DCV)
Outside
Air Adjust fresh-air
90% Occupied
intake based on
Floor 4
occupancy
10% Occupied Floor 3
Ventilation demand
50% Occupied Floor 2
is determined by
CO2 level (ppm)
80% Occupied Floor 1

5. DCV Benefits
• Maintain acceptable indoor air quality (IAQ)
• Reduce energy consumption
• Monitor space occupancy
• Meet ASHRAE standards
• Support LEED certification

6. Powercast Wireless CO2 Sensors
• Fast installation / Easy relocation
• Reduced occupant disruption
• Long battery life (3-15 years)
• 0 - 5000ppm measurement
• Connect to any BAS network

7. Powercast Sensor System
Building
Wireless CO2
Network Sensors
Local Monitoring
Wireless
Gateway
Cloud
Monitoring

8. Payback
Payback = System Cost
Period Monthly Energy Savings
• Measured in months, not years
• Timeframe supported by US DoE studies

9. Where to Use?
• Office buildings
• Theaters, Auditoriums
• Shopping malls, retail complex
• Hospitals, Hotels, Schools, Dormitories
• Government buildings
• Bars, nightclubs, entertainment venues
• Many other places of human occupancy

10. More Information
PowercastSensors.com
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