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US 12,613,049 B2Granted
Air handling unit
AssigneeCarrier Corporation
InventorLoris Rion
Life of this patent
Estimating the term…
Abstract
An air handling unit includes an air treatment unit for treating at least a part of the fresh air via a treatment that gives rise to a pressure drop as well as a mixing damper for controlling air flow between a return air pat, and a supply air path for allowing recycling of air from a return air inlet to a supply air outlet. A supply fan sensor is used for measuring a parameter associated with air flow across the supply fan. An air treatment unit sensor is used for measuring a pressure drop across the air treatment unit in the supply air path. The air handling unit has a control system in order to determine the rate of fresh air flow, as well as optionally other control functions.
Claims14
An air handling unit comprising:
- a return air inlet for receiving return air;
- an exhaust air outlet for expelling exhaust air to atmosphere;
- a fresh air inlet for receiving fresh air from the atmosphere;
- a supply air outlet for providing supply air;
- an air treatment unit for treating at least a part of the fresh air via a treatment device that gives rise to a pressure drop;
- an exhaust fan for urging air along a return air path from the return air inlet toward the exhaust air outlet;
- a supply fan for urging air along a supply air path from the fresh air inlet via the air treatment unit to the supply air outlet;
- a mixing damper for controlling air flow between the return air path and the supply air path and for allowing recycling of air from the return air inlet to the supply air outlet;
- a supply fan sensor for measuring a parameter associated with air flow across the supply fan;
- an exhaust fan sensor for measuring a parameter associated with air flow across the exhaust fan;
- an air treatment unit sensor for measuring a pressure drop across the air treatment unit in the supply air path;
- and
- a control system comprising a memory for data storage and a processor for determining operating parameters of the air handling unit, wherein the control system receives input from the supply fan sensor, the exhaust fan sensor, and the air treatment unit sensor, wherein the memory comprises stored air flow data concerning a relationship between a rate of fresh air flow at the fresh air inlet and the measured pressure drop across the air treatment unit, wherein the processor is configured to use the stored air flow data and the measured pressure drop to determine the rate of fresh air flow;
- and wherein the control system is configured to perform a calibration process to obtain the stored air flow data, the calibration process including measuring the differential pressure at the air treatment unit with the mixing damper fully closed and the supply fan speed varying, using an output of the supply fan sensor to determine a rate of air flow at the supply fan as the fan speed varies, and mapping known rates of air flow across the air treatment unit against the differential pressure measured by the air treatment unit sensor.
11 more elements
An air handling unit comprising:
- an air handling unit comprising:
- a return air inlet for receiving return air;
- an exhaust air outlet for expelling exhaust air to atmosphere;
- a fresh air inlet for receiving fresh air from the atmosphere;
- a supply air outlet for providing supply air;
- an air treatment unit for treating at least a part of the fresh air via a treatment device that gives rise to a pressure drop;
- an exhaust fan for urging air along a return air path from the return air inlet toward the exhaust air outlet;
- a supply fan for urging air along a supply air path from the fresh air inlet via the air treatment unit to the supply air outlet;
- a mixing damper for controlling air flow between the return air path and the supply air path and for allowing recycling of air from the return air inlet to the supply air outlet;
- a supply fan sensor for measuring a parameter associated with air flow across the supply fan;
- an exhaust fan sensor for measuring a parameter associated with air flow across the exhaust fan;
- an air treatment unit sensor for measuring a pressure drop across the air treatment unit in the supply air path;
- and
- a control system comprising a memory for data storage and a processor for determining operating parameters of the air handling unit, wherein the control system receives input from the supply fan sensor, the exhaust fan sensor, and the air treatment unit sensor, wherein the memory comprises stored air flow data concerning a relationship between a rate of fresh air flow at the fresh air inlet and the measured pressure drop across the air treatment unit, wherein the processor is configured to use the stored air flow data and the measured pressure drop to determine the rate of fresh air flow, wherein the stored air flow data includes parameters for a formula for determining fresh air flow, Q, where the differential pressure dP is fitted to a curve of the form:
- Q=(a1×dP{circumflex over ( )}b1)+(a2×dP{circumflex over ( )}b2)+(a3×dP{circumflex over ( )}b3)+ . . . +(an×dP{circumflex over ( )}bn)+ . . . +c
- where c, a1, a2, a3, . . . an are constants, where any of the constants c, a1, a2, a3, . . . an can be zero, and where b1, b2, b3, . . . , bn are integer values.
13 more elements
Dependencies are inferred from the claim text.