US2007149109A1PendingUtilityA1
Occupancy based ventilation system
Est. expiryDec 23, 2025(expired)· nominal 20-yr term from priority
F24F 2120/10F24F 11/63F24F 11/46F24F 11/30
49
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Claims
Abstract
An occupancy based ventilation system for indoor air quality that uses a counter to count the number of persons in a specific indoor room or other area, wherein the number of persons determines the degree of ventilation from the room's ventilation system. The counter would keep track of both the number of persons and the length of time each is present in the room. A feedback control algorithm between the counting device and the ventilation management controls provides for automatic control of the amount of ventilation needed to insure a comfortable and efficient environment.
Claims
exact text as granted — not AI-modified1 . An occupancy based ventilation system for indoor air quality of a predetermined area, comprising:
a room ventilation system for providing outdoor air to said predetermined area; a counter for counting the number of persons in said area and the amount of time each person remains in said area, said counter producing a signal representing the sum of the number of persons times the amount of time for each person; and a processor for adjusting said ventilation system for said area based on the signal produced, said processor being adapted to determine the amount of ventilation needed to maintain the CO 2 concentration in the room air at a predetermined level.
2 . The system of claim 1 , wherein said CO 2 concentration is 500 ppm or less.
3 . The system of claim 1 , wherein said counter is positioned by the entrance to said area.
4 . The system of claim 1 , wherein said counter includes a sensor selected from photo cells, IR detectors, RF detectors, pressure plates and a turnstile.
5 . The system of claim 1 , wherein said processor is further adapted to adjust the amount of ventilation based on the outside air temperature.
6 . The system of claim 5 , wherein first detector further includes a first filter that passes only said first IR band and said second detector further includes a second filter that passes only said second IR band.
7 . The system of claim 1 , wherein said processor uses the algorithm:
ⅆ
P
CO
2
ⅆ
t
=
j
CO
2
*
N
(
t
)
-
v
CO
2
(
t
)
Vol
where dP CO2 /dt is the rate of CO 2 partial pressure change in the room, V CO2 (t) is the rate of 300 ppm CO 2 /air ventilation into the room, N(t) is the number of people in the room as a function of time, and j CO2 is the average CO 2 respiration rate of a person.
8 . An occupancy based ventilation system for indoor air quality of a predetermined area, comprising:
room ventilation system means for providing outdoor air to said predetermined area; counter means for counting the number of persons in said area and the amount of time each person remains in said area, said counter producing a signal representing the sum of the number of persons times the amount of time for each person; and processor means for adjusting said ventilation system for said area based on the signal produced, said processor being adapted to determine the amount of ventilation needed to maintain the CO 2 concentration in the room air at a predetermined level.
9 . The system of claim 8 , wherein said CO 2 concentration is 500 ppm or less.
10 . The system of claim 8 , wherein said counter means is positioned by the entrance to said area.
11 . The system of claim 8 , wherein said counter means includes a sensor selected from photo cells, IR detectors, RF detectors, pressure plates and a turnstile.
12 . The system of claim 8 , wherein said processor means is further adapted to adjust the amount of ventilation based on the outside air temperature.
13 . The system of claim 8 , wherein said processor means is further adapted to adjust the amount of ventilation based on the air temperature in the room.
14 . The system of claim 8 , wherein said processor means uses the algorithm:
ⅆ
P
CO
2
ⅆ
t
=
j
CO
2
*
N
(
t
)
-
v
CO
2
(
t
)
Vol
where dP CO2 /dt is the rate of CO 2 partial pressure change in the room, V CO2 (t) is the rate of 300 ppm CO 2 /air ventilation into the room, N(t) is the number of people in the room as a function of time, and j CO2 is the average CO 2 respiration rate of a person.
15 . A method for controlling indoor air quality of a predetermined area having a room ventilation system for providing outdoor air to said predetermined area, comprising the steps of:
positioning a counter for counting the number of persons in said area and the amount of time each person remains in said area, and producing a signal representing the sum of the number of persons times the amount of time for each person; and adjusting said ventilation system for said area based on the signal produced using a processor, said processor being adapted to determine the amount of ventilation needed to maintain the CO 2 concentration in the room air at a predetermined level.
16 . The method of claim 15 , wherein said CO 2 concentration is 500 ppm or less.
17 . The method of claim 15 , wherein said counter is positioned by the entrance to said area.
18 . The method of claim 15 , wherein said counter includes a sensor selected from photo cells, IR detectors, RF detectors, pressure plates and a turnstile.
19 . The method of claim 15 , wherein said processor adjusts the amount of ventilation based on the outside air temperature.
20 . The method of claim 15 , wherein said processor adjusts the amount of ventilation based on the air temperature in the room.
21 . The method of claim 15 , wherein said processor uses the algorithm:
ⅆ
P
CO
2
ⅆ
t
=
j
CO
2
*
N
(
t
)
-
v
CO
2
(
t
)
Vol
where dP CO2 /dt is the rate of CO 2 partial pressure change in the room, V CO2 (t) is the rate of 300 ppm CO 2 /air ventilation into the room, N(t) is the number of people in the room as a function of time, and j CO2 is the average CO 2 respiration rate of a person.Join the waitlist — get patent alerts
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