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US 12,710,185 B2Granted
HVAC airflow measurement with in-situ calibration
AssigneeThe Energy Conservatory, Inc.
InventorSteven B. Rogers
Life of this patent
Estimating the term…
Abstract
In-situ calibration of a flow measurement device in a forced air HVAC system. A flow measurement that is obtained by a flow measurement device that is temporarily installed in the HVAC system is used to calibrate a flow measurement device that is permanently installed in the HVAC system. The calibration described herein can be aided by a technician installing or servicing the HVAC system.
Claims21
A method of calibrating a flow measurement device, the method comprising:
- obtaining a first flow measurement by a first flow measurement device of a forced air HVAC system;
- calibrating a second flow measurement device of the forced air HVAC system in-situ,
- wherein the first flow measurement is obtained while the first flow measurement device and the second flow measurement device are installed in series in the forced air HVAC system to measure a volumetric or mass of air flow through the HVAC system and the forced air HVAC system is operating, wherein the calibrating of the second flow measurement device is based on a difference in the first flow measurement and a second flow measurement by the second flow measurement device;
- and
- removing the first flow measurement device after calibrating the second flow measurement device.
2 more elements
A method comprising:
- in a forced air HVAC system in which a first flow measurement device is installed at a first location and a second flow measurement device is installed at a second location in series with the first flow measurement device to measure a volumetric or mass of air flow through the HVAC system, obtaining a first flow measurement using the first flow measurement device and obtaining a second flow measurement using the second flow measurement device;
- comparing the first flow measurement and the second flow measurement;
- calibrating the second flow measurement device in-situ or replacing the second flow measurement device based on a determined difference between the first flow measurement and the second flow measurement;
- and
- removing the first flow measurement device after calibrating the second flow measurement device.
2 more elements
A system comprising:
- a forced air HVAC system with a blower, a supply duct in fluid communication with the blower and receiving air therefrom, and a return duct in fluid communication with the blower and returning air thereto;
- a first flow measurement device that is temporarily installable in the return duct at a first location, the first flow measurement device includes a first wireless data transmitter;
- a second flow measurement device that is permanently installed in the supply duct at a second location, the second flow measurement device includes a second wireless data transmitter;
- and
- a receiving device in wireless communication with the first wireless data transmitter and with the second wireless data transmitter, the receiving device includes a data processor that is in communication with a storage device that includes instructions which, when executed by the data processor, configure the data processor to calibrate the second flow measurement device in-situ using one or more flow measurements obtained by the first flow measurement device,
- wherein the first flow measurement device and the second flow measurement device are installed in series in the forced air HVAC system to measure a volumetric or mass of air flow through the HVAC system,
- wherein calibrating the second flow measurement device in-situ is based on a difference in the one or more flow measurements by the first flow measurement device and a flow measurement by the second flow measurement device.
4 more elements
Dependencies are inferred from the claim text.