Trane International Inc.

American Standard International Inc.

Ronnie R Moffitt

James Kenneth McKeever

Aaron E Opatz

Zubin Varghese

John Arthur Murphy

Yogesh Pandit

Jeyaprakash Gurusamy

Eugene R Shedivy

A dehumidifying air handling unit for an HVACR system includes a housing, a desiccant wheel, and a cooling heat exchanger. A main airflow path extending through the housing from an air inlet to and air discharged outlet of the housing. The desiccant wheel includes a first end and a second end that are each disposed in the main airflow path and a metal organic framework desiccant that is moved between the first end and the second end. A desiccant wheel includes a metal organic framework desiccant disposed on a surface of the desiccant wheel. Rotation of the desiccant wheel moves a position of the surface between a first end and a second end of the desiccant wheel. The metal organic framework desiccant has an majority absorption-desorption operating band of 25% relative humidity or less.

Dehumidifying air handling unit and desiccant wheel therefor

Systems, apparatus and methods for operating an environmental control system that delivers dehumidified outdoor air into a conditioned space through an air valve. The method includes establishing COsetpoints corresponding to a ventilation outdoor air flow rate and a dehumidification outdoor air flow rate, determining a humidity metric of the conditioned space, and delivering outside air to the conditioned space at the ventilation outdoor air flow rate or dehumidification outdoor air flow rate based upon the humidity metric. The outside air may be tempered with return air from the conditioned space. The dehumidification COset point is determined by predicting the dehumidification COset point based on the airflow quantity per occupant and the relationship of the occupant predicted water vapor emission rate and COemission rate.

Demand control ventilation with predictive humidity control

A method of controlling a discharge air reset in an heating, ventilation, air conditioning, and refrigeration (HVACR system includes determining, by a controller, a space temperature in a conditioned space, a setpoint temperature of the conditioned space, and an operating mode of a variable-air-volume (VAV) box for the conditioned space. The controller determines whether the operating mode of the VAV box matches an operating mode of an HVACR unit. A deviation from the setpoint temperature of the conditioned space for the VAV box for the conditioned is calculated in response to determining the VAV box is in a same mode as the HVACR unit. An average deviation from the setpoint temperature of the conditioned space is calculated. A discharge air setpoint temperature is determined based on the average deviation from the setpoint temperature of the conditioned space. The controller sets the discharge air setpoint temperature of the HVACR unit using the determined discharge air setpoint temperature.

Discharge air reset for a constant volume air changeover bypass

A method of controlling a discharge air reset in an heating, ventilation, air conditioning, and refrigeration (HVACR system includes determining, by a controller, a space temperature in a conditioned space, a setpoint temperature of the conditioned space, and an operating mode of a variable-air-volume (VAV) box for the conditioned space. The controller determines whether the operating mode of the VAV box matches an operating mode of an HVACR unit. A deviation from the setpoint temperature of the conditioned space for the VAV box for the conditioned is calculated in response to determining the VAV box is in a same mode as the HVACR unit. A statistical deviation from the setpoint temperature of the conditioned space is calculated. A discharge air setpoint temperature is determined based on the statistical deviation from the setpoint temperature of the conditioned space. The controller sets the discharge air setpoint temperature of the HVACR unit using the determined discharge air setpoint temperature.

A heat exchange assembly in an air to air heat exchanger includes an arrangement, construction, and/or configuration of a combination of latent heat exchangers and sensible heat exchangers. The heat exchange assembly can minimize footprint required for the air to air heat exchanger, e.g. air handler, by avoiding the need for block offs and plenums, can support direct mounting of a bypass damper(s), can provide acceptable pressure drop ratings and provide good heat exchange efficiency and energy recovery performance. The arrangement and configuration of the sensible heat exchangers and latent heat exchangers of the heat exchange assembly have condensate management for example to provide frost protection.

Heat exchange assembly in an air to air heat exchanger

An HVAC system includes a desiccant wheel, wherein the wheel's speed varies with airflow, the wheel is energized for at least a set period at startup, and/or a heat recovery system (e.g., an air-to-air heat exchanger) upstream of the wheel enhances the system's ability to dehumidify air.

HVAC desiccant wheel system and method

A heat recovery arrangement. The arrangement has a housing including a bathroom exhaust inlet, an exhaust outlet, a bathroom exhaust airflow path through the housing from the bathroom exhaust inlet to the exhaust outlet, a return air inlet, and a return air path through the housing from the return air inlet to the exhaust outlet. The housing also has an outside air inlet, a supply air outlet, an outside air path through the housing from the outside air inlet to the supply air outlet; and a heat recovery device extracting heat from the exhaust airflow path and the return airflow path and transferring heat to the outside airflow path.

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Harrodsburg, KY, United States of America

Ronnie R Moffitt