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| Number | Title | Issue Date |
| 7266960 | Single integrated humidity and ventilation control in an HVAC system HVAC systems are employed to control the indoor environmental characteristics of a building structure to make it comfortable for its inhabitants. An HVAC system includes one single integrated central control to regulate an indoor temperature level, an indoor relativ... | 09/11/2007 |
| 7150314 | Dual exhaust energy recovery system 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 thr... | 12/19/2006 |
| 7059400 | Dual-compartment ventilation and air-conditioning system having a shared heating coil An HVAC system has two variable-air-volume (VAV) systems, a first VAV system for moving fresh air and a second VAV system for moving recycled air. Both the fresh air and recycled air are cooled and dehumidified by a single heat-exchanging coil. The fresh and recycle... | 06/13/2006 |
| 7051946 | Air re-circulation index An index of air re-circulation in a data center having one or more racks is determined to identify the level of heated air re-circulation into cooling fluid delivered to the one or more racks. The one or more racks comprise inlets and outlets and are positioned alon... | 05/30/2006 |
| 6904968 | Method and apparatus for individually cooling components of electronic systems A cooling system is configured to supply individually metered amounts of cooling fluid to heat generating components of an electronic system. The cooling system includes at least one variable speed fan configured to supply fluid through a centralized plenum and ther... | 06/14/2005 |
| 6688966 | Air handling unit with supply and exhaust fans An air handling apparatus for blending outside and return airflow including a housing having exterior side walls, a top and a bottom and containing first and second inlet regions and a mixing chamber. Outside air flows through a first inlet into the first... | 02/10/2004 |
| 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 |
| 6578770 | Thermostat incorporating a carbon dioxide sensor suitable for reading using potentiostat techniques, and environmental control system incorporating such thermostat A system for monitoring and modifying the quality and temperature of air within a conditioned space includes a blower unit, an optional damper unit for selectively admitting outside air into the conditioned space, a temperature moderating unit and a contr... | 06/17/2003 |
| 6415617 | Model based economizer control of an air handling unit A strategy for controlling an air side economizer of an HVAC system uses a model of the airflow through the system to estimate the load in two modes when minimum and maximum amounts of outdoor air are being introduced into the building. Transitions betwee... | 07/09/2002 |
| 6318096 | Single sensor mixing box and methodology for preventing air handling unit coil freeze-up A method of controlling the mixing of outside air and return air, entering an air handling unit, through inlets having dampers, the air handling unit having a coil for conditioning the incoming air and a fan for blowing the conditioned air into a conditio... | 11/20/2001 |
| 6298912 | Method and system for controlling an economizer A method and system for controlling the temperature of air returned to a conditioning unit in a zoned system is disclosed. The system includes a heating, ventilating, and air conditioning (HVAC) unit that has an economizer. The HVAC unit is connected to a... | 10/09/2001 |
| 6295823 | Apparatus and method for controlling temperature and humidity of a conditioned space An apparatus for controlling temperature and humidity of a conditioned space uses an outside air cooling coil circuit in fluid communication with coolant from a cooling supply. Outside air is introduced over the outside air cooling coil circuit through a ... | 10/02/2001 |
| 6209331 | Air handling controller for HVAC system for electric vehicles An air-flow management system for controlling the supply air to a motor vehicle passenger compartment is disclosed. The air-flow management system includes a reversible heat pump system for transferring heat energy between an outside environment and a ref... | 04/03/2001 |
| 6168515 | Air conditioning intake door control A vehicle air conditioning control system includes an actuator for controlling the position of an outside air intake door and an ambient exhaust gas sensor. A controller of the control system monitors a time rate of change of the degree of uncleanness per... | 01/02/2001 |
| 6161764 | Enhanced economizer controller An enhanced controller for an air conditioning system incorporating mechanical cooling equipment and an economizer, the enhanced controller including circuits for producing signals indicative of commanded changes in temperature of air admitted into the ai... | 12/19/2000 |
| 6135201 | Air conditioning apparatus for vehicle with double layer flow mode In an air conditioning apparatus for a vehicle, a double layer flow mode is set when the maximum heating state is set during an air outlet mode where both a foot opening portion and a defroster opening portion are opened. During the double layer flow mode... | 10/24/2000 |
| 6134895 | Method of air conditioning system temperature control A method of air conditioning system temperature control for a motor vehicle is disclosed. The method includes the steps of measuring an air conditioning compressor discharge pressure and determining if the discharge pressure is greater than a predetermine... | 10/24/2000 |
| 6126540 | Staged power exhaust for HVAC air handling units An air handling unit for a heating, ventilating and air conditioning system of a building has a plurality of exhaust fans. The exhaust fans are sequentially activated in response to the amount of air flowing into the air handling unit from outdoors. Thus ... | 10/03/2000 |
| 6112807 | System and method for defogging a vehicle window There is disclosed a system and method for preventing fogging of the windows of an automotive vehicle. The system and method operate the air conditioning system of the vehicle at temperatures where a high degree of probability of fogging exists. The metho... | 09/05/2000 |
| 6105666 | Vehicular air conditioning apparatus Described is an apparatus for air conditioning a passenger compartment of an automotive vehicle which achieves a quick warming-up of the passenger compartment. In the air conditioning apparatus, in addition to a coolant of a vehicular engine which is util... | 08/22/2000 |
| 6077158 | Air handling controller for HVAC system for electric vehicles An air-flow management system for controlling the supply air to a motor vehicle passenger compartment is disclosed. The air-flow management system includes a reversible heat pump system for transferring heat energy between an outside environment and a ref... | 06/20/2000 |
| 6067808 | Method of air conditioner operation for minimizing moisture condensed on evaporator core A method for reducing overall workload of a vehicle air conditioning (a/c) system takes into account the humidity conditions. A high humidity condition can be detected by monitoring windshield wiper operation for a threshold period of time. High humidity ... | 05/30/2000 |
| 6055848 | Air quality measuring device The present invention provides a device for measuring air quality. The device includes at least one sensor with a sensor resistance which is converted via signal processing into an output signal, the gas sensing or air content sensing device having its se... | 05/02/2000 |
| 5987905 | Air conditioning apparatus for vehicle An air conditioning apparatus for a vehicle includes an air conditioning case for forming an air passage through which air is blown into a passenger compartment. In the air conditioning apparatus, during a cooling mode for cooling a passenger compartment,... | 11/23/1999 |
| 5988518 | Automotive air conditioner On an air-conditioning control panel equipped with an inside/outside air changeover switch which enables selection of an inside air recirculation mode, an outside air intake mode or an inside-outside two-air layer mode and comprises an inside air recircul... | 11/23/1999 |
| 5971067 | Air quality control system The present invention is a system for controlling the quality of air in a building. The system includes a sensor disposed for sensing the air quality in a building. Upon a sensing of an air quality problem, the system issues a command to draw in additiona... | 10/26/1999 |
| 5946923 | Air conditioning system for vehicle An air conditioning system for a vehicle is composed of a control unit which controls an air switching door, an element for detecting a clean-air level of the outside air and a vehicle speed sensor. The control unit controls the air-switching door to set ... | 09/07/1999 |
| 5937940 | Method and system for predicting air discharge temperature in a control system which controls an automotive HVAC system Method and system for predicting air discharge temperature in a control system which controls an automotive HVAC (heating, ventilation and air conditioning) system using a model. The model is based on signals generated by various climate control sensors a... | 08/17/1999 |
| 5862982 | Optimal ventilation control strategy The present invention provides a method of modeling multi zone ventilation systems. The method integrates flow rate standards with the concept of age of air. The method serves as the basis for several different ventilation effectiveness calculation method... | 01/26/1999 |
| 5791408 | Air handling unit including control system that prevents outside air from entering the unit through an exhaust air damper A control system for controlling an air handling unit. The control system links the position of an exhaust air damper and a recirculation air damper so as the exhaust air damper is opened, the recirculation air damper is closed the same amount, and vice v... | 08/11/1998 |
| 5725425 | Sensor system for controlling ventilation systems in vehicles A motor vehicle ventilation system having a recirculation or air input mode in which when the rate of change of a signal from an outdoor gas pollution sensor exceeds a threshold limit, the system is adjusted to the recirculation mode.... | 03/10/1998 |
| 5516330 | Air conditioning system for a passenger aircraft An air conditioning system for a pressurized aircraft body includes an air flow closed loop into which fresh air may be introduced either through a fresh air treatment unit or through a trim valve or through both. A first series connection of system compo... | 05/14/1996 |
| 5348077 | Integrated air exchanger An integrated air exchanger (10) is disclosed for controlling the volume and temperature of air exchanged between an external environment (14) and a supplied environment (16). In that regard, a relatively simple crossed damper (72) controls air introduced... | 09/20/1994 |
| 5301744 | Modular air conditioning system An air conditioning system is disclosed which is capable of receiving interchangeable ventilation modules having varying degrees of air mixing abilities. A ventilation module fits inside the air conditioning system and connects to a return air opening, an... | 04/12/1994 |
| 5293928 | Air-conditioner for automobiles An automobile air-conditioner wherein a controlled variable used to determine the control mode of a component of the air-conditioner is corrected or restricted according to the amount of shifting of the head part setting temperature for driving the compon... | 03/15/1994 |
| 4996849 | Air conditioning system An air conditioning system for a preferably air cooled vehicle has a housing having an evaporator, a chamber and at least one blower. The housing, by way of outlet ducts having individually blockable defroster, center and legroom nozzles, is connected wit... | 03/05/1991 |
| 4941326 | Air conditioner having outdoor air introducing mechanism An air conditioner in which an outdoor unit having a compressor, a condenser, and expansion valve and an outdoor fan and an indoor unit having an evaporator and an indoor fan are connected by a piping to form a refrigerating cycle, and which has an outdoo... | 07/17/1990 |
| 4871011 | Air-conditioning equipment for vehicle An air-conditioning equipment for a vehicle includes first and second local shutter control units each having a motor for moving a shutter, a drive circuit for driving the motor, a controlling device responsive to a heat load signal to control the drive c... | 10/03/1989 |
| 4841733 | Dri-Pc humidity and temperature controller A temperature and humidity control system for natatoriums. The system provides a constant volume of air circulation which is used to control temperature and humidity in the natatorium while inhibiting the accumulation of moisture on the surfaces defining ... | 06/27/1989 |
| 4836096 | Variable air volume air distribution system An improved variable air volume air distribution system for distributing air within the interior of a building. The variable air volume air distribution system includes an air supply plenum, a supply fan for transferring air from the air supply plenum int... | 06/06/1989 |
