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| Number | Title | Issue Date |
| 6606872 | Active refrigerant circuit using condenser fan of an inactive circuit A chiller system includes at least two refrigerant circuits. In a low ambient temperature condition, only one refrigerant circuit is activated, but its condenser fan is de-energized. To provide some airflow across the condenser of the activated circuit, a... | 08/19/2003 |
| 6606881 | Absorption solution conditioner A filter system for an absorption chiller includes a replaceable filter element, a plateable member, and a sacrificial member. The filter receives a weak solution from the chiller's evaporator, receives a stronger solution from the chiller's absorber, and... | 08/19/2003 |
| 6604688 | Air handler with return air bypass for improved dehumidification A VAV air handler includes a cooling coil with a return air bypass damper for improved dehumidification. The bypass interjects into the supply air a portion of relatively warm, dry return air downstream of the cooling coil. This allows the cooling coil to... | 08/12/2003 |
| 6601405 | Single-pass, direct-fired generator for an absorption chiller A direct-fired generator for an absorption chiller includes an inner shell, in which combustion occurs, and an outer shell. The inner shell supports a tube bundle through which a first portion an absorption solution is conveyed. Combustion products makes ... | 08/05/2003 |
| 6585484 | Pivotal and removable door for an air handler An air handler enclosure having a pivotal door panel covers an access opening leading to a blower inside the enclosure. The door panel is held in engagement with the enclosure when the panel is fully open or closed. The panel can completely disengage the ... | 07/01/2003 |
| 6577131 | Motor terminal fixture A motor test fixture for connection to motor terminal lugs. The fixture includes a housing including a plurality of external apertures positioned and formed to enclose the motor terminal lugs; an aperture in the housing; a chamber within the housing havin... | 06/10/2003 |
| 6572689 | Vapor/liquid separator for an absorption chiller An absorption apparatus for an absorption chiller includes a series of eliminator blades situated between a vaporizing chamber (e.g., a generator or an evaporator) and a devaporizing chamber (e.g., a condenser or an absorber). Each of the blades includes ... | 06/03/2003 |
| 6564562 | Generator solution outlet box for an absorption chiller An absorption apparatus includes a generator with an integrated outlet box comprising a liquid sensing chamber and a solution outlet chamber. The sensing chamber has an opening into the generator, with the opening being sized according to the liquid surfa... | 05/20/2003 |
| 6564560 | Oil-free liquid chiller A refrigeration chiller employs a centrifugal compressor the impellers of which are mounted on a shaft which is itself mounted for rotation using rolling element bearings lubricated only by the refrigerant which constitutes the working fluid of the chille... | 05/20/2003 |
| 6564564 | Purge A purging device for a system accumulating condensable and non-condensable gases. The purging device comprises: a purge tank; apparatus receiving the condensable and non-condensable gases from the system and directing said gases into the purge tank; appar... | 05/20/2003 |
| 6563287 | Method of controlling three phase motor starting sequence A motor starter. The motor starter comprises a motor; start, run, shorting and transition contactors operably associated with the motor; and run, start, shorting and transition auxiliary contactors. The transition auxiliary contactor operably controls the... | 05/13/2003 |
| 6532754 | Method of optimizing and rating a variable speed chiller for operation at part load A method of optimizing the design of a chiller involves placing more emphasis on the chiller's performance at part load than at full load and rating the chiller accordingly. In some embodiments, compressor speed and impeller diameter are chosen to optimiz... | 03/18/2003 |
| 6516627 | Flowing pool shell and tube evaporator An evaporator for a refrigeration chiller includes a tube bundle in which at least a portion of the tubes of the tube bundle are immersed in a pool which include both liquid refrigerant and is lubricant. Liquid refrigerant and lubricant are deposited into... | 02/11/2003 |
| 6459276 | Rotor analyzer for an induction motor A rotor analyzer for an induction motor or generator checks and quantifies the integrity of a rotor that is not currently installed within its stator. The analyzer includes an electromagnetic coil that exposes the bars of a rotor to a pulsating magnetic f... | 10/01/2002 |
| 6456473 | Input overload protection for multiple input controller A current loop input overload protection system for a controller having multiple inputs includes zener diodes that limit the maximum voltage that can be applied to any input. If an electrical short of a temperature, pressure or humidity transducer forces ... | 09/24/2002 |
| 6435269 | Heat exchanger with intertwined inner and outer coils A double-row heat exchanger coil includes intertwined inner and outer loops. The loops are situated to allow one continuous coil to be wound in an uninterrupted coiling operation, and later cut at several locations to create several individual circuits th... | 08/20/2002 |
| 6427767 | Nucleate boiling surface The present invention provides an improved heat transfer surface. The improved heat transfer comprises: a surface covered with fin convolutions. The fin convolutions have fin tips extending from the surface. The fin tips have a first plurality of notches ... | 08/06/2002 |
| 6401485 | Discharge refrigerant heater for inactive compressor line A refrigerant system includes two compressors that are independently activated to meet a variable cooling demand of a comfort zone or a process. For high cooling demands, both compressors are operated. However, for lower cooling demands, one compressor is... | 06/11/2002 |
| 6398581 | Bus connector and method for integrating electrical test points in the bus connector A system for electrically connecting electrical components. The system comprises a ribbon cable, a connector cap and a connector base. The connector cap includes a track area adapted to operably engage the ribbon cable, a cap alignment guide, and a cap or... | 06/04/2002 |
| 6386281 | Air handler with return air bypass for improved dehumidification A VAV air handler includes a cooling coil with a return air bypass damper for improved dehumidification. The bypass interjects into the supply air a portion of relatively warm, dry return air downstream of the cooling coil. This allows the cooling coil to... | 05/14/2002 |
| 6382311 | Nucleate boiling surface The present invention provides an improved heat transfer surface. The improved heat transfer comprises: a surface covered with fin convolutions. The fin convolutions have fin tips extending from the surface. The fin tips have a first plurality of notches ... | 05/07/2002 |
| 6382310 | Stepped heat exchanger coils A heat exchanger comprising: a plurality of longitudinally extending tubes grouped into at least first, second and third passes; the tubes in the first pass being serially connected with tubes in the second pass; the tubes in the second pass being seriall... | 05/07/2002 |
| 6381970 | Refrigeration circuit with reheat coil A refrigeration system with a high percentage of fresh air. The system comprises a supply air duct; an indoor heat exchange coil operably positioned in the supply air duct; a reheat heat exchange coil operably positioned in the supply air duct; an outdoor... | 05/07/2002 |
| 6377426 | Gas furnace with variable speed draft inducer A method of controlling a variable speed draft inducer motor and fan in a gas furnace. The method comprises the steps of: detecting a first fault driving the motor to a maximum operating range; detecting a second fault forcing the motor to operate towards... | 04/23/2002 |
| 6357254 | Compact absorption chiller and solution flow scheme therefor An absorption chiller includes a vertically split absorber section the upper portion of which is a high temperature absorber and the lower portion of which is a low temperature absorber. Weak solution is pumped in parallel from the absorber to both a low ... | 03/19/2002 |
| 6357239 | Oil return from chiller evaporator Oil return from the evaporator to the compressor of a refrigeration chiller is accomplished by routing the suction piping that communicates between the chiller's evaporator and compressor to a location physically below the lubricant-rich pool at the botto... | 03/19/2002 |
| 6341492 | Oil return from chiller evaporator Oil return from the evaporator to the compressor of refrigeration chiller is accomplished by routing the suction piping that communicates between the chiller's evaporator and compressor to a location physically below the lubricant-rich pool at the bottom ... | 01/29/2002 |
| 6341948 | Internal oil filter element for refrigeration compressor A refrigeration unit having a compressor that includes a cast member, a cavity formed in the cast member, and an oil filter element dividing the cavity into an inlet cavity and an outlet cavity. An inlet port for directing the unfiltered oil into the inle... | 01/29/2002 |
| 6341493 | HVAC control and method for interpreting broad range of input voltages An HVAC (heating, ventilating, and air conditioning) control and method for interpreting a broad range of input voltages generates a series of voltage pulses whose quantity increases with the amplitude of the input voltages. Upon counting the pulses or ac... | 01/29/2002 |
| 6321558 | Water source heat pump with hot gas reheat A refrigerant system selectively operable in a cooling mode, a reheat cooling mode, and a heating mode, includes a primary heat exchanger and a reheat heat exchanger that condition air for a room. In the cooling mode, the primary heat exchanger functions ... | 11/27/2001 |
| 6318117 | Absorption chiller with counter flow generator A generator for an absorption chiller boils an absorption solution with steam heat by conveying the steam through a tube bundle with the steam flowing counter to the flow of solution. The tube bundle runs downhill in the direction of steam flow, while in ... | 11/20/2001 |
| 6305081 | Installing and servicing an HVAC system A valve in valve assembly. The assembly comprises a housing having an internal passage, a valve body in the housing and movably operable to control process fluid flow through the passage, and a chamber in the valve body. The chamber is open to the passage... | 10/23/2001 |
| 6293119 | Enhanced economizer function in air conditioner employing multiple water-cooled condensers A self-contained air conditioner cools a building's air using a water-cooled economizer coil and two refrigerant evaporators. The two evaporators are provided by two separate refrigeration circuits, each having its own water-cooled condenser. A water circ... | 09/25/2001 |
| 6290467 | Centrifugal impeller assembly A impeller shaft assembly is disclosed for use in a refrigerant compressor, and more particularly in a commercial high-speed centrifugal impeller shaft configuration. The impeller shaft assembly includes a contoured spacer body. The contoured spacer body ... | 09/18/2001 |
| 6276152 | Chiller capacity control with variable chilled water flow compensation A method of controlling chiller capacity in a chiller system. The method comprises the steps of: measuring entering the fluid temperature of a fluid entering a heat exchanger; measuring the fluid temperature of the fluid leaving the heat exchanger; determ... | 08/21/2001 |
| 6272869 | Multiple orifice expansion device An expansion device in a refrigeration chiller defines at least two fixed orifices and employs at least two positionable valve members in order to minimize the overall flow area through the expansion device under a first set of chiller operating condition... | 08/14/2001 |
| 5138844 | Condenser fan control system for use with variable capacity compressor A method of controlling a multiplicity of condenser fans in a refrigeration system comprising the steps of: calculating a first difference in state between a high pressure side and a low pressure side of the refrigeration system; determining an optimum st... | 08/18/1992 |
| 5070937 | Internally enhanced heat transfer tube An internally enhanced heat transfer tube comprising a heat transfer tube including an internal surface and an internal diameter (D); a plurality of roughness elements on the internal surface of the heat transfer tube, each roughness element having a heig... | 12/10/1991 |
| 5067560 | Condenser coil arrangement for refrigeration system A condenser for an air conditioning or refrigeration system having first, second, third and fourth condenser coils arranged in a modified "W" arrangement.... | 11/26/1991 |
| 5060722 | Furnace heat exchanger A serpentine passage for a gas furnace clam shell-type heat exchanger comprising a serpentine passage having an inlet and an outlet where the serpentine passage, from the outlet toward the inlet, is shaped as a leaning, cursive w with the trailing end cur... | 10/29/1991 |
