HVAC dynamic air volume correction
AssigneeFrostFire Services Inc.
InventorWayne Andrew Kavanagh
Life of this patent
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Abstract
An HVAC volume correction controller for a building's HVAC system, and an associated method, for dynamically modulating the volumetric airflow rate entering the building to account for the thermal expansion of air through a blow through heat exchanger. The HVAC volume correction controller: (i) calculates a temperature differential between an air discharge temperature and an air intake temperature; (ii) calculates a volume correction factor, taking into account the thermal expansion coefficient of air and the temperature differential; and (iii) modifies a blower motor speed of the blow through heat exchanger. The HVAC volume correction controller can be retrofitted on existing HVAC systems, or can be integrated with a blow through heat exchanger for new installations.
Claims18
A method of operating a HVAC system for a building defining an interior airspace, the HVAC system comprising a HVAC system blower and a blow through heat exchanger, the HVAC system blower having a HVAC system blower motor, the method being executed by at least one controller operatively connected to the HVAC system, the method comprising:
- calculating a temperature differential between a temperature at a discharge region of the blow through heat exchanger and a temperature at an intake region of the blow through heat exchanger;
- calculating a volume correction factor based on the calculated temperature differential, wherein the volume correction factor accounts for the thermal expansion of air within the temperature differential;
- calculating a modified motor speed according to the volume correction factor;
- and
- transmitting a signal comprising an indication of the modified motor speed to cause modification of a speed of the HVAC system blower motor.
A volume correction controller for a HVAC system for a building defining an interior airspace, the HVAC system comprising a HVAC system blower and a blow through heat exchanger, the HVAC system blower having a HVAC system blower motor, the volume correction controller comprising:
- a. a communication interface operatively connected to the HVAC system;
- b. a non-transitory storage medium, the non-transitory storage medium storing computer-readable instructions thereon;
- and
- c. a processing unit operatively connected to the non-transitory storage medium and the communication interface;
- the processing unit, upon executing the computer-readable instructions, being configured for:
- calculating a temperature differential between a temperature at a discharge region of the blow through heat exchanger and a temperature at an intake region of the blow through heat exchanger;
- calculating a volume correction factor based on the calculated temperature differential, wherein the volume correction factor accounts for the thermal expansion of air within the temperature differential;
- calculating a modified motor speed according to the volume correction factor;
- and transmitting a signal comprising an indication of the modified motor speed to cause modification of a speed of the HVAC system blower motor.
Dependencies are inferred from the claim text.