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Home Journal Wireless Temperature-controlled Air-vent System
 

Wireless Temperature-controlled Air-vent System

The Activent is a wireless electronically controlled air register that opens or closes automatically to maintain a constant and optimal room temperature. The patented system replaces existing vent/register covers in any home or business, converting them into active components in a zoned heating and cooling system—eliminating the common problems of over-heated or over-cooled rooms.

In a typical home or building of course, a central thermostat tells the heating or cooling system to turn on and off. Hot or cool air is pumped throughout the home until the central thermostat reaches the temperature selected. However, because homes and businesses are composed of large and small rooms—each with different windows, ductwork and environments—achieving a desired temperature in one room may cause another room to be over-heated or over-cooled.

The Activent "zones" a home or business by automatically gauging the temperature of that room and wirelessly closing the vent when that temperature is reached, allowing the desired temperature in a room to be easily set and achieved. The Activent can be used as a retrofit in any home or business, as part of a remodel or in any new construction.


How it works
After installing the Activent as the new register, users simply set the desired room temperature using the wireless remote temperature controller. The RTC communicates with the Activent louver system to maintain the set temperature. The RTC also can be used to manually open and close the Activent louver system. This wireless thermostat can be placed anywhere within the room signaling the vent to close when that temperature is reached or to open when additional heating and cooling is needed. Battery life with alkaline batteries is approximately one year.


Money/energy savings
Switching the RTC to the heater mode in winter or the A/C mode in summer creates a comfortable environment while saving money. The Activent redistributes hot or cold air to other rooms allowing the home to reach its set temperature in a more efficient manner. Depending on how many are installed in a house or office, the energy savings can be as much as 40%. With the vent automatically closed at the desired temperature, the heating or cooling that would have been wasted in one room is automatically redirected to the remaining rooms. Each Activent will pay for itself in a little over a year.


The data

The following data was taken from the Campbell, CA (a suburb of San Jose) home in which the Activent system was installed. Installation occurred in winter when the outside temperature averaged 40°F–42°F. The first step included measuring to determine the four warmest rooms. The vents were replaced with Activents. When the room temperature was established, the Activents closed, redirecting the warm air to other portions of the house. The house heated faster and the furnace turned off sooner. This resulted in the following energy savings:
 
Number of Activents installed
4
Customer cost/vent
$75.00
Total customer cost 
$300.00
 
 
Average heating period w/o Activents
13 minutes
Average heating period w Activents
9 minutes
Number of heating periods/day w/o Activents
12
Number of heating periods/day w/Activents
12
 
 
Cost per day w/o Activents
$12
Cost per day w/Activents
$8.31
Total savings/heating day
$3.69 (30.78%)
 
 
Number of heating days/year
100
Cost/year w/o Activents
$1,200.00
Cost/year w/Activents
$831.00
Total savings/year
$369.00
 
 
Payback period (years)
0.8 (~10 mo)
 
 
Residential Volume Calculation
Room description
Area (ft2)
Volume (ft3)
Percentage
of home
Dining Room
140
1,190
8.05%
Kitchen
140
1,190
8.05%
Living Room
240
2,040
13.79%
Family Room
200
1,700
11.49%
Bedroom 1
120
1,020
6.90%
Bedroom 2
120
1,020
6.90%
Bedroom 3
140
1,190
8.05%
Bedroom 4
280
2,380
16.09%
Hallways
140
1,190
8.05%
Hall Bathroom
100
850
5.75%
Master Bath
120
1,020
6.90%
Total
1,740
14,790
100.00%
   
Forced Air Heater Data
Manufacturer
Carrier
Product/Model
58RAV095
Max amps
10.2 A
Max outlet pressure
0.5 in. wc
Max outlet-air temperature
180°F
  
Carrier Data, Energy Consumption, Average
Location
Bay Area
Heating cost
$1,064
Cooling cost
$258
Based upon 50,000 Btu heating requirment.
Average fuel rate/therm
$1.090
Nominal 3-ton A/C
Electric rate assumed ($/kWh)
$0.110

For more information, visit www.theactivent.com.

 
 
 
 
 
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