Carrier Controls. Demand Controlled Ventilation. Comfort = Temperature + Ventilation. Ventilation Control. Comfort Is More Than Just The Right Temperature…. Why Ventilation?. Ventilation Control. Why Ventilation?. Comfort Health & Safety Compliance. Ventilation Provides.
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Temperature + Ventilation
Ventilation ControlComfort Is More Than Just The Right Temperature…
Health & Safety
The same way it was in 1930.
With Fixed Ventilation!
Building codes require ventilation rates based on cfm/person: (typically 20 cfm/person)
Max Occupancy: 25 people = 500cfm
Actual Occupancy: 1 person = 500cfm
Actual Occupancy: 5 people = 500cfm
Total cfm = Max occupants X 20 cfm
There Is No Control!
Is There A Better Way?
Temperature + Ventilation SensorTemperature Control In A Multi-Zoned Building
What if we did the same thing with ventilation?
The RIGHT Amount of Fresh Air,
To The RIGHT Place,
At The RIGHT Time…
But How Does It Work?
ASHRAE 62.1 & 90.1
ASTM CO2 &
CO2 is the control parameter for ventilation!
Single Zone Ventilation
Actual Occupancy 1 person = 20cfm
Actual Occupancy 5 people = 100cfm
Actual Occupancy 25 people = 500cfm
Ventilation based on actual occupancy!
Healthy & Efficient!
But How Does Carrier Do It?
The innovative DDC control system that automatically gives you the ventilation you need only when you really need it, with a thermostat or network.
Individual sensors throughout the building work together to identify and immediately respond to changing needs for total comfort control.
Here’s how it works…
As certain areas become occupied, the PremierLink identifies the changing temperature load as well as the change in ventilation requirements.
Outside air dampers are utilized only as deemed necessary by actual occupant CO2 levels (rather than maximum assumed levels), thus reducing energy consumption by the HVAC system.
Mechanical Engineers Handbook
Explains relationship between CO2 and ventilation
NY Building code details CO2 levels shall not be greater than one part in one thousand
Energy crunch introduce VAV system for commercial buildings
ASHRAE Standard 62-89 sets 1000 PPM maximum
Interpretation IC-62-1989-27 clarifies use of CO2 as a method of controlling ventilation based on occupancy
ASHRAE 62-99 eliminates 1000 PPM CO2 threshold inside/outside differential introduced
ComfortID introduced zone level DCV
Carrier introduces low cost temp/CO2 sensor
People exhale CO2 at concentrations of 4% (40,000 ppm)
Normal room concentrations are in the range of 400 - 1200 ppm
As a gas, CO2 diffuses
and equalizes rapidly throughout a room
CO2 levels will build until an equilibrium level is reached with outside air entering the space
PremierLink Ventilation Savings
This chart compares ventilation usage throughout a typical day using purple to represent “demand controlled” and green to represent “constant.” The difference between the two equates to significant savings.
RJ-14 for CCN
TechnologyCO2 Plus Temp Sensor
First Cost Effective Zone Level CO2 + Temp Sensor
TechnologyNDIR Gas Sensing
Target gas absorbs radiation at signature wavelength
Filter isolates wavelength that reaches detector
More gas in chamber leads to lower signal to detector
0 ppm CO2
1000 ppm CO2
2000 PPM CO2
Long life (15 years expected)
Selective - no interference with other gases
Stable - does not require calibration
Automatic Baseline Calibration (ABC Logic)
Self calibrating algorithm
Considers lowest CO2 level every 24 hrs
Looks at long term changes in baseline
Applies a correction factor for calibration
TechnologySelf Calibration Of A CO2 Sensor
International Mechanical Code:
“Current technology (CO2 sensors) can permit the design of ventilation systems that are capable of detecting the occupant load of the space and automatically adjusting the ventilation rate accordingly.”
Model, State & Local Codes
Accepted by: ASHRAE Standard 62
Can Be Measured & Documented!
Improves Occupant/Customer Satisfaction
Helps Prevent Sick Building Syndrome Health Affects
Zone Ventilation ControlNumerous Studies Confirm That Correct Ventilation ...
“Air Quality and Ventilation”
ranked very high (#2 of 25) on the list
of tenant retention issues
in a recent survey conducted by
Real Estate Information Systems.
Health & Safety
Zone Ventilation ControlEnsure for every zone…
Eliminate Wasteful Over-Ventilation
Very Attractive ROI/Lower Operating Costs
Zone Ventilation ControlA Better Operating Building