Systems and computer program products for measuring airflow rates in heating, ventilating, and air conditioning (HVAC) ducts and HVAC systems including the same
First Claim
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1. A heating, ventilating and air conditioning (HVAC) system, the system comprising:
- at least one duct;
a high resolution airflow measurement system positioned in the duct, the high resolution airflow measurement system including thermistor pairs in a first plurality of cells in the duct, each pair including a self-heated thermistor and a reference thermistor and the high resolution system being configured to be removed from the duct and replaced by a low resolution airflow measurement system, the low resolution airflow measurement system including thermistor pairs in a second plurality of cells in the duct, the second plurality being less than the first plurality;
a power module configured to regulate a variable amount of power delivered to the self-heated thermistor;
an analog to digital convertor (ADC) configured to receive a non-linear output of the self-heated thermistor; and
a calculation module configured to receive an output of the ADC and calculate data used to control air flow in the HVAC system.
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Abstract
An airflow measurement system configured to be received in a duct of a heating, ventilating and air conditioning (HVAC) system is provided. The air flow measurement system includes a housing, and a plurality of cells positioned in the housing, the plurality of cells being configured such that air flows through the plurality of cells when the flow measurement system is positioned in the duct of the HVAC system, wherein at least one of the cells includes a self-heated thermistor.
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Citations
14 Claims
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1. A heating, ventilating and air conditioning (HVAC) system, the system comprising:
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at least one duct; a high resolution airflow measurement system positioned in the duct, the high resolution airflow measurement system including thermistor pairs in a first plurality of cells in the duct, each pair including a self-heated thermistor and a reference thermistor and the high resolution system being configured to be removed from the duct and replaced by a low resolution airflow measurement system, the low resolution airflow measurement system including thermistor pairs in a second plurality of cells in the duct, the second plurality being less than the first plurality; a power module configured to regulate a variable amount of power delivered to the self-heated thermistor; an analog to digital convertor (ADC) configured to receive a non-linear output of the self-heated thermistor; and a calculation module configured to receive an output of the ADC and calculate data used to control air flow in the HVAC system. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A computer program product for measuring air flow in a heating, ventilation and air conditioning (HVAC) system, the computer program product comprising:
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a non-transitory computer readable storage medium including computer readable program code embodied therein, the computer readable program code comprising; computer readable program code configured to receive data collected in an HVAC system using a high resolution system including thermistor pairs in a first plurality of cells in a duct of the HVAC system, each pair including a self-heated thermistor and a reference thermistor and the high resolution system being configured to be removed from the duct and replaced by a low resolution airflow measurement system, the low resolution airflow measurement system including thermistor pairs in a second plurality of cells in the duct, the second plurality being less than the first plurality; and computer readable program code configured to calculate configuration details for the HVAC system based on the received collected data associated with the HVAC system and data associated with other HVAC systems provided by a centralized reference model. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification