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| Number | Title | Issue Date |
| 8109104 | System and method for detecting decreased performance in a refrigeration system Systems and methods are provided for detecting performance degradation in a refrigeration system. Specifically, the present invention provides systems and methods for detecting, at a very early stage, a low refrigerant charge and degradation in condenser performance... | 02/07/2012 |
| 8011197 | Apparatus to sense and control compressor operation in an HVAC system An HVAC system and method for configuring a controller to control a compressor including a detection system provided to determine a type of compressor. The detection system includes a processor; and a load sensing circuit connected between the processor and a contro... | 09/06/2011 |
| 7918099 | Medium voltage starter for a chiller unit A single medium voltage starter box is mounted on a chiller unit with the other components of the chiller system. The starter box can be positioned on the chiller system unit to permit the starter box to be close coupled to the motor, and specifically to the main mo... | 04/05/2011 |
| 7908881 | HVAC system with powered subcooler An HVAC system having a main circuit and a subcooler circuit. The main circuit includes a main circuit evaporator, a main circuit expansion device, a main circuit condenser and a main circuit compressor connected in a closed refrigerant loop. The subcooler circuit i... | 03/22/2011 |
| 7895852 | System and method for controlling an economizer circuit A control algorithm for controlling an economizer circuit in a chiller system is provided. The control algorithm opens and closes a port valve in the economizer circuit in response to predetermined criteria to engage and disengage the economizer circuit. The predete... | 03/01/2011 |
| 7845185 | Method and apparatus for dehumidification An HVAC system including a compressor, a condenser and an evaporator arrangement connected in a closed refrigerant loop. The evaporator arrangement includes a plurality of refrigerant circuits. The evaporator arrangement also includes at least one distributor config... | 12/07/2010 |
| 7849710 | Falling film evaporator A falling film evaporator is provided for use in a two-phase refrigeration system or process system. The evaporator includes a shell having an upper portion, a lower portion, and a tube bundle having tubes extending substantially horizontally in the shell. A hood is... | 12/14/2010 |
| 7849698 | Method and apparatus to sense and establish operation mode for an HVAC control A method for configuring a controller for an HVAC system. The method comprises providing a closed loop refrigerant system and a control system to control the closed loop refrigerant system. The control system comprises a controller, an input device, and a processor ... | 12/14/2010 |
| 7784295 | Two-zone fuzzy logic liquid level control 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 methodol... | 08/31/2010 |
| 7770411 | System and method for using hot gas reheat for humidity control A humidity control method is provided for a multi-stage cooling system having two or more refrigerant circuits that balances humidity control and cooling demand. Each refrigerant circuit includes a compressor, a condenser and an evaporator. A hot gas reheat circuit ... | 08/10/2010 |
| 7743617 | Chiller sound reduction control system and method A noise control method is provided for a cooling system having at least one refrigerant circuit. The refrigerant circuit includes a compressor, a condenser, at least one condenser fan, and an evaporator. Noise control is only performed periodically in response to re... | 06/29/2010 |
| 7726140 | System and method for using hot gas re-heat for humidity control A humidity control method is provided for a multi-stage cooling system having two or more refrigerant circuits. A hot gas re-heat circuit having a hot gas re-heat coil, an evaporator and a compressor, such as the evaporator and compressor utilized in one of the refr... | 06/01/2010 |
| 7678434 | Thermally-enhanced HVAC constructions A thermally-enhanced, insulated component for use with an HVAC system includes a component having an outer surface usable with an HVAC system, the component being substantially filled with an insulating material. A thin, dimensionally stable layer of thermal barrier... | 03/16/2010 |
| 7661274 | System and method for capacity control in a multiple compressor chiller system A capacity control algorithm for a multiple compressor liquid chiller system is provided wherein the speed and number of compressors in operation are controlled in order to obtain a leaving liquid temperature setpoint. In response to an increase in the load in the c... | 02/16/2010 |
| 7640066 | Transport of encapsulated serial data via instant messaging communication A method and system is provided for gathering and packetizing data from networked building automation equipment, and for transmitting data packets as instant messages to remotely located users. An instant messaging (IM) server-based system is provided to facilitate ... | 12/29/2009 |
| 7621141 | Two-zone fuzzy logic liquid level control 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 methodol... | 11/24/2009 |
| 7619906 | System for precharging a DC link in a variable speed drive A variable speed drive with a converter that is controllable to precharge a DC link is provided. The variable speed drive also includes an inverter. The converter converts a fixed line frequency, fixed line voltage AC power from an AC power source into DC power. The... | 11/17/2009 |
| 7587911 | Compact evaporator for chiller application An evaporator including a shell having a first end and a second end. A plurality of tubes are disposed within the shell to circulate refrigerant through the shell. A plurality of shell inlets are in fluid communication with the shell to deliver a fluid to exchange h... | 09/15/2009 |
| 7578659 | Compressor discharge muffler A discharge muffler (20) in an HVAC&R system (100) includes a plurality of tubes (34, 38, 42) of predetermined length that are disposed at a predetermined spacing in substantially mutual axial alignment by a plate (30). The tubes (34, ... | 08/25/2009 |
| 7562536 | Method and apparatus to sense and control compressor operation in an HVAC system An HVAC system and method for configuring a controller to control a compressor including a detection system provided to determine a type of compressor. The detection system includes a processor; and a load sensing circuit connected between the processor and a contro... | 07/21/2009 |
| 7559207 | Method for refrigerant pressure control in refrigeration systems A method and system for controlling refrigerant pressure in an HVAC system. The method includes providing a compressor, a condenser and an evaporator connected in a closed refrigerant loop. The condenser has a header arrangement capable of distributing refrigerant t... | 07/14/2009 |
| 7555912 | System for precharging a DC link in a variable speed drive A variable speed drive with a converter that is controllable to precharge a DC link is provided. The variable speed drive also includes an inverter. The converter converts a fixed line frequency, fixed line voltage AC power from an AC power source into DC power. The... | 07/07/2009 |
| 7537084 | Discharge gas check valve integral with muffler A compressor muffler includes a housing having an inlet end and an outlet end. A baffle arrangement extends from an interior surface of the housing. The baffle arrangement includes a surface capable of reflecting compressed fluid to attenuate noise. A valve assembly... | 05/26/2009 |
| 7513754 | Sheet metal support for a furnace blower A motor mount constructed from a single piece of sheet metal. The motor mount contains a band portion and at least three leg portions. The band portion clamps around a motor and the leg portions radiate from the band portion. The leg portions secure the motor to a h... | 04/07/2009 |
| 7481619 | Extended venturi fan ring A high efficiency, low-noise fan ring for use with a heat exchanger having an annular fan ring body attached to a coaxial mounting ring. The fan ring body extends in a substantially perpendicular direction from an inner periphery of the mounting ring. The annular bo... | 01/27/2009 |
| 7440809 | HTML driven embedded controller A method and system is provided for gathering, processing, displaying, and manipulating data from building equipment using a dedicated HTML-driven, non-PLC controller having an integral web server. Authorized users who use microprocessor controlled devices to access... | 10/21/2008 |
| 7439702 | Application of a switched reluctance motion control system in a chiller system A chiller system includes a switched reluctance motor for powering the compressor of the chiller system. A variable speed drive with a boost converter provides a boosted voltage to the switched reluctance motor. The switched reluctance motor and the compressor may b... | 10/21/2008 |
| 7434415 | System and method for using hot gas reheat for humidity control A humidity control method is provided for a multi-stage cooling system having two or more refrigerant circuits that balances humidity control and cooling demand. Each refrigerant circuit includes a compressor, a condenser and an evaporator. A hot gas reheat circuit ... | 10/14/2008 |
| 7434089 | System and method for loading software into a control panel for a chiller system A system and process for loading control software into the control panel of a liquid chiller system is provided. A PCMCIA card socket is installed on a circuit board of a liquid chiller control system and is in direct connection with microprocessor data and address ... | 10/07/2008 |
| 7425806 | System and method for controlling a variable speed drive A variable speed drive is provided having a converter to convert an AC voltage to a DC voltage, a DC link to filter and store energy from the converter, and a plurality of inverters. Each inverter is configured to convert a DC voltage to an AC voltage and is electri... | 09/16/2008 |
| 7421853 | Enhanced manual start/stop sequencing controls for a stream turbine powered chiller unit A control system and method for interactive startup and shutdown of a steam turbine driven chiller unit is provided. The chiller unit includes an integrated central control panel to control operation of both the steam turbine system and the refrigerant system. The c... | 09/09/2008 |
| 7421854 | Automatic start/stop sequencing controls for a steam turbine powered chiller unit A control system and method are provided for the automatic startup and shutdown of a steam turbine driven chiller unit. The chiller unit includes an integrated central control panel to control operation of both the steam turbine system and the refrigerant system. Th... | 09/09/2008 |
| 7424345 | Automated part procurement and service dispatch A method for repairing an HVAC system is disclosed. The method includes monitoring a plurality of sensors positioned throughout the HVAC system and receiving data associated therewith, determining whether the data received from the plurality of sensors is within cor... | 09/09/2008 |
| 7413413 | System and method to reduce acoustic noise in screw compressors A system is provided for attenuating tonal acoustic noise associated with a single positive displacement compressor, or multiple positive displacement compressors proximately located from each other. A controller selectably controls the rotational speed and the freq... | 08/19/2008 |
| 7387498 | System and method for noise attenuation of screw compressors A system is provided for attenuating noise in at least two positive displacement compressors proximately located from each other for use with at least one heating or cooling system. A lead compressor and a lag compressor have a selectably controllable rotational spe... | 06/17/2008 |
| 7356999 | System and method for stability control in a centrifugal compressor A stability control algorithm is provided for a centrifugal compressor. The stability control algorithm is used to control a variable geometry diffuser and a hot gas bypass valve (when provided) in response to the detection of compressor instabilities. The stability... | 04/15/2008 |
| 7353659 | System and method for controlling an economizer circuit A control algorithm for controlling an economizer circuit in a chiller system is provided. The control algorithm opens and closes a port valve in the economizer circuit in response to predetermined criteria to engage and disengage the economizer circuit. The predete... | 04/08/2008 |
| 7353662 | Medium voltage starter for a chiller unit A single medium voltage starter box is mounted on a chiller unit with the other components of the chiller system. The starter box can be positioned on the chiller system unit to permit the starter box to be close coupled to the motor, and specifically to the main mo... | 04/08/2008 |
| 7328587 | Integrated adaptive capacity control for a steam turbine powered chiller unit A control system for a steam turbine driven chiller unit is provided. The control system automatically utilizes the full range of the governor, compressor pre-rotation vanes, and hot gas bypass valve capabilities to control the capacity of the chiller and provide an... | 02/12/2008 |
| 7295896 | Automated part procurement and service dispatch A method for repairing an HVAC system is disclosed. The method includes monitoring a plurality of sensors positioned throughout the HVAC system and receiving data associated therewith, determining whether the data received from the plurality of sensors is within cor... | 11/13/2007 |
