Air change rate measurement and control
First Claim
1. A method for controlling a system, the method comprising:
- receiving temperature and humidity measurements of supply air to a serviced space, return air from the serviced space, and outside air, wherein the outside air includes air outside the serviced space, and a flow rate of the supply air to the serviced space;
calculating a volumetric flow rate of the outside air entering the system using the received temperature and humidity measurements of the supply air, the return air, the outside air, and the flow rate of the supply air to the serviced space;
calculating an air change per hour (ACH) rate in the serviced space using the calculated volumetric flow rate of the air outside the serviced space entering the system and the volume of the serviced space; and
controlling the ACH rate in the serviced space.
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Accused Products
Abstract
A method for controlling a system includes receiving temperature and humidity measurements of supply air to a serviced space, return air from the serviced space, and outside air, wherein the outside air includes air outside the serviced space, calculating a volumetric flow rate of the outside air entering the system using the received temperature and humidity measurements of the supply air, the return air, and the outside air, calculating an air change per hour (ACH) rate in the serviced space using the calculated volumetric flow rate of the air outside the serviced space entering the system and the volume of the serviced space, and controlling the ACH rate in the serviced space.
15 Citations
20 Claims
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1. A method for controlling a system, the method comprising:
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receiving temperature and humidity measurements of supply air to a serviced space, return air from the serviced space, and outside air, wherein the outside air includes air outside the serviced space, and a flow rate of the supply air to the serviced space; calculating a volumetric flow rate of the outside air entering the system using the received temperature and humidity measurements of the supply air, the return air, the outside air, and the flow rate of the supply air to the serviced space; calculating an air change per hour (ACH) rate in the serviced space using the calculated volumetric flow rate of the air outside the serviced space entering the system and the volume of the serviced space; and controlling the ACH rate in the serviced space. - View Dependent Claims (5, 6, 20)
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2. A method for controlling a system, the method comprising:
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receiving temperature and humidity measurements of supply air to a serviced space, return air from the serviced space, and outside air, wherein the outside air includes air outside the serviced space, and a flow rate of the supply air to the serviced space; calculating a volumetric flow rate of the outside air entering the system using the received temperature and humidity measurements of the supply air, the return air, the outside air, and the flow rate of the supply air to the serviced space; calculating an air change per hour (ACH) rate in the serviced space using the calculated volumetric flow rate of the air outside the serviced space entering the system and the volume of the serviced space; and controlling the ACH rate in the serviced space; wherein the calculating the volumetric flow rate of the outside air entering the system (CFMo) using the received temperature and humidity measurements of the supply air, the return air, the outside air, and the flow rate of the supply air to the serviced space comprises; calculating a density of the supply air (ds), a density of the return air (dr), and a density of the outside air (do); and calculating an absolute humidity of the supply air (Ws), absolute humidity of the return air (Wr), and absolute humidity of the outside air (Wo); calculating a volumetric flow rate of the supply air (CFMs); and calculating the CFMo, wherein CFMo=CFMs*(dr*Wr−
ds*Ws)/(do*Wo). - View Dependent Claims (3)
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4. A method for controlling a system, the method comprising:
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receiving temperature and humidity measurements of supply air to a serviced space, return air from the serviced space, and outside air, wherein the outside air includes air outside the serviced space, and a flow rate of the supply air to the serviced space; calculating a volumetric flow rate of the outside air entering the system using the received temperature and humidity measurements of the supply air, the return air, the outside air, and the flow rate of the supply air to the serviced space; calculating an air change per hour (ACH) rate in the serviced space using the calculated volumetric flow rate of the air outside the serviced space entering the system and the volume of the serviced space; and controlling the ACH rate in the serviced space; wherein the calculating the ACH rate in the serviced space comprises calculating a product of the CFMo and 60 and dividing the product by a volume of the serviced space.
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7. A system comprising:
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a first sensor arrangement to measure a temperature and humidity of outside air, the outside air including air outside a serviced space; a second sensor arrangement to measure a temperature and humidity of return air flowing from the serviced space; a third sensor arrangement to measure a temperature and humidity of supply air flowing into the serviced space; and a controller communicatively connected to the first sensor, the second sensor, and the third sensor, the controller to receive temperature and humidity measurements from the sensors, calculate a volumetric flow rate of the outside air entering the system using the received temperature and humidity measurements of the supply air, the return air, the outside air, and a flow rate of the supply air to the serviced space, calculate an air change per hour (ACH) rate in the serviced space using the calculated volumetric flow rate of the air outside the serviced space entering the system and the volume of the serviced space, control the ACH rate in the serviced space. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. A method for calculating an air change per hour (ACH) rate in a system, the method comprising:
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receiving temperature and humidity measurements of supply air to a serviced space, return air from the serviced space, outside air, wherein the outside air includes air outside the serviced space, and a flow rate of the supply air to the serviced space; calculating a volumetric flow rate of the outside air entering the system using the received temperature and humidity measurements of the supply air, the return air, the outside air, and the flow rate of the supply air to the serviced space; calculating an ACH rate in the serviced space using the calculated volumetric flow rate of the air outside the serviced space entering the system and the volume of the serviced space; and outputting the calculated ACH rate. - View Dependent Claims (19)
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16. A method for calculating an air change per hour (ACH) rate in a system, the method comprising:
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receiving temperature and humidity measurements of supply air to a serviced space, return air from the serviced space, outside air, wherein the outside air includes air outside the serviced space, and a flow rate of the supply air to the serviced space; calculating a volumetric flow rate of the outside air entering the system using the received temperature and humidity measurements of the supply air, the return air, the outside air, and the flow rate of the supply air to the serviced space; calculating an ACH rate in the serviced space using the calculated volumetric flow rate of the air outside the serviced space entering the system and the volume of the serviced space; and outputting the calculated ACH rate; wherein the calculating the volumetric flow rate of the outside air entering the system (CFMo) using the received temperature and humidity measurements of the supply air, the return air, the outside air, and the flow rate of the supply air to the serviced space comprises; calculating a density of the supply air (ds), a density of the return air (dr), and a density of the outside air (do); and calculating an absolute humidity of the supply air (Ws), absolute humidity of the return air (Wr), and absolute humidity of the outside air (Wo); calculating a volumetric flow rate of the supply air (CFMs); and calculating the CFMo, wherein CFMo=CFMs*(dr*Wr−
ds*Ws)/(do*Wo). - View Dependent Claims (17)
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18. A method for calculating an air change per hour (ACH) rate in a system, the method comprising:
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receiving temperature and humidity measurements of supply air to a serviced space, return air from the serviced space, outside air, wherein the outside air includes air outside the serviced space, and a flow rate of the supply air to the serviced space; calculating a volumetric flow rate of the outside air entering the system using the received temperature and humidity measurements of the supply air, the return air, the outside air, and the flow rate of the supply air to the serviced space; calculating an ACH rate in the serviced space using the calculated volumetric flow rate of the air outside the serviced space entering the system and the volume of the serviced space; and outputting the calculated ACH rate; wherein the calculating the ACH rate in the serviced space comprises calculating a product of the CFMo and 60 and dividing the product by a volume of the serviced space.
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Specification