Johnson Controls Technology Company

York International Corporation

Johnson Controls Tyco IP Holdings Llp

William Fred McQuade

Neelkanth S Gupte

Jeb William Schreiber

Mustafa Kemal Yanik

Satheesh Kulankara

Justin Patrick Kauffman

Paul Marie De Larminat

Jay A Kohler

Soren Bierre Poulsen

Lee Li Wang

John C Hansen

Jay C Walser

Thomas R Barratt

Steven M Maddox

Daniel Keir McCormick

Gregory Keith Beaverson

Mark A Adams

Keith E Starner

A leak detection system of a heating, ventilating, and air conditioning (HVAC) system includes a sensor configured to detect a UV tracer in a monitored gas volume of the HVAC system. The leak detection system also includes a controller communicatively coupled to the sensor. The controller is configured to modify operation of the HVAC system in response to the sensor detecting the UV tracer in the monitored gas volume.

Ultraviolet (UV) light-based refrigerant leak detection system and method

The present disclosure relates to a heating, ventilating, and air conditioning (HVAC) system that includes a refrigerant circuit and a sensor configured to measure a refrigerant concentration external to the refrigeration circuit. The HVAC system also includes a controller that is communicatively coupled to the sensor and to an economizer. The controller is configured to control a flow of environmental air into the HVAC system. The controller is further configured to increase a ratio of the flow of environmental air relative to a flow of return air from a conditioned interior space of a building when the sensor measures the refrigerant concentration above a predetermined threshold concentration.

Systems and methods for detecting and responding to refrigerant leaks in heating, ventilating, and air conditioning systems

A heating ventilation and air conditioning (HVAC) control system. The HVAC control system includes a sensor that detects a refrigerant released from an HVAC system and emits a signal indicative of the detection. The HVAC control system also includes a switch that blocks a flow of electricity to an enclosed space and a controller that receives the signal from the sensor and activates the switch to block the flow of electricity in response to detection of the refrigerant.

Heating, ventilation, and air conditioning control system with refrigerant leak control

The present disclosure relates to a refrigeration circuit that includes a controller communicatively coupled to a compressor, an expansion valve, and a sensor of the refrigeration circuit. The controller may activate the compressor and actuate the expansion valve such that the compressor is active while the expansion valve is closed. The controller may also measure a pressure of a refrigerant in the refrigeration circuit using the sensor while the compressor is active and the expansion valve is closed. Additionally, the controller may determine whether a refrigerant leak exists based on a maximum measurement time being reached or a time difference between a first time associated with the compressor being active while the expansion valve is closed and a second time associated with the measured pressure falling below a threshold value.

Diagnostic mode of operation to detect refrigerant leaks in a refrigeration circuit

A refrigerant gas sensing system of a heating, ventilating, and air conditioning (HVAC) system, wherein the refrigerant gas sensing system is configured to collect a sample from a monitored gas volume, to introduce an ignition source to the sample, to detect an amount of combustion product in the sample after ignition, to determine an amount of leaked refrigerant in the monitored gas volume based on the measured amount of combustion product, and to indicate the amount of leaked refrigerant in the monitored gas volume.

Refrigerant gas sensing system

Heating, ventilation, and air conditioning control system

A refrigerant leak detection system for a heating, ventilation, and air conditioning (HVAC) system includes a vessel configured to receive an air sample. The refrigerant leak detection system includes a cooling device configured to cool the vessel and a liquid detection device configured to detect liquid in the vessel. The refrigerant leak detection system further includes an actuator configured to actuate a transfer mechanism to collect the air sample in the vessel.

Refrigerant leak detection and management based on condensation from air samples

An evaporator () in a vapor compression system () () includes a shell (), a first tube bundle (); a hood (); a distributor (); a first supply line (); a second supply line (); a valve () positioned in the second supply line (); and a sensor (). The distributor () is positioned above the first tube bundle (). The hood () covers the first tube bundle (). The first supply line () is connected to the distributor () and an end of the second supply line () is positioned near the hood (). The sensor () is configured and positioned to sense a level of liquid refrigerant () in the shell. The valve () regulates flow in the second supply line in response to the level of liquid refrigerant () from the sensor ().

Vapor compression system

An heat exchanger for use in a vapor compression system is disclosed and includes a shell, a first tube bundle, a hood and a distributor. The first tube bundle includes a plurality of tubes extending substantially horizontally in the shell. The hood covers the first tube bundle. The distributor is configured and positioned to distribute fluid onto at least one tube of the plurality of tubes.

Heat exchanger

A level control algorithm for an HVAC refrigeration system is provided. The control algorithm utilizes a fuzzy logic methodology to automatically adjust a flow of refrigerant in the system to maintain a desired liquid level in the condenser. The fuzzy logic methodology incorporates a plurality of fuzzy logic control algorithms each having different membership functions and other control parameters that can provide different degrees of level control in the condenser. A particular fuzzy logic control algorithm is selected based on the amount a measured liquid level in the condenser deviates from the desired liquid level in the condenser.

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New Cumberland, PA, United States of America

William Fred McQuade