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US 2006/0130502 A1Published application
Virtual controller for mixed air low temperature protection of HVAC systems
OwnerRichard Wruck, Larry Weberinventors
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OwnerRichard Wruck, Larry Weberinventors
Estimating the term…
A method for protecting an HVAC system of an air handling unit from low temperature outdoor ventilation air. The air handling unit may include an outdoor fresh air region, a return air region, a supply air region, and a damper situated in or adjacent to the fresh air region to regulate the flow of outdoor air into the air handling unit. The air handling unit mixes the outdoor fresh air and the return air to provide a mixed air stream to the HVAC system. In one illustrative embodiment, one or more sensors are used to measure the temperature and flow rate of the air entering or passing through the outdoor fresh air region, the temperature of the air entering or passing through the return air region and the flow rate of the air passing through the supply air region. The temperature of the mixed air stream, which is provided to the HVAC system, is then calculated using a controller or the like. In some cases, when the temperature of the mixed air stream falls below a threshold value, the controller may instruct the damper to close and reduce the fresh outdoor air that is brought into the air handler unit. Various other embodiments and algorithms are disclosed.
A method for determining a characteristic of a mixed airflow stream in a air handling unit (AHU), wherein the AHU includes at least two flow inputs that are mixed to provide the mixed airflow stream, and a flow output, the method comprising:
A method for determining a characteristic of a mixed airflow stream in a air handling unit (AHU), wherein the AHU includes at least two flow inputs that are mixed to provide the mixed airflow stream, and a flow output, the method comprising:
A method for determining the temperature of a mixed airflow stream in a air handling unit (AHU), wherein the AHU includes an outdoor fresh air input port, a return air input port, a return air exhaust port, and a supply air port, wherein the mixed airflow stream is a mixture of the air passing through the outdoor fresh air input port and the return air input port, the method comprising:
A method for determining the temperature of a mixed airflow stream in a air handling unit (AHU), wherein the AHU includes an outdoor fresh air input port, a return air input port, a return air exhaust port, and a supply air port, wherein the mixed airflow stream is a mixture of the air passing through the outdoor fresh air input port and the return air input port, the method comprising:
An air handling unit (AHU) having an outdoor fresh air input port, a return air input port, and a supply air port, wherein the AHU mixes the air passing through the outdoor fresh air input port with the return air input port to produce a mixed air stream, the AHU comprising:
A method for determining the mixed air temperature in a air handling unit (AHU), the air handling unit including a fresh air region, a return air region, and a supply air region, the method comprising:
A method for protecting a HVAC system of an air handling unit from low temperatures wherein the air handling unit includes a fresh air region, a return air region, a supply air region, and a damper situated in or adjacent to the fresh air region to regulate the flow of outdoor air into the HVAC, the method comprising:
Dependencies are inferred from the claim text.