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| Number | Title | Issue Date |
| 7205533 | Cooling apparatus A cooling apparatus (10) for cooling a detector (52), the cooling apparatus including an inner and an outer countercurrent heat exchanger (12 and 14, respectively) for a first and a second gas in a thermally insulating housing (16)... | 04/17/2007 |
| 7191826 | Variable speed fan motor control for forced air heating/cooling system A fan motor speed control system for controlling the fan motor speed of an air conditioning system includes a power output circuit including a power triac which is turned on and off by an opto-isolator connected to a pulse generator circuit for varying an AC voltage... | 03/20/2007 |
| 7079387 | Computer cooling system and method A computer system includes an enclosure, a backplane within the enclosure, a replaceable unit releasably connected to the backplane, an air cooling system configured to create an air flow along the replaceable unit and an air flow blocking system. The air flow block... | 07/18/2006 |
| 7069976 | Method and arrangement for controlling the temperature of the outstream flow from a heat exchanger and measuring produced heat Process and device for controlling the temperature of an outbound secondary flow in a secondary circuit from a heat exchanger by a primary flow in a primary circuit, via a member that regulates the primary flow, influenced by a control unit. The enthalpy difference ... | 07/04/2006 |
| 7044213 | Constant temperature refrigeration system for extensive temperature range application and control method thereof A constant temperature refrigeration system for extensive temperature range application comprising a refrigerator, a low-temperature heat exchanger, a medium-temperature heat exchanger, a high-temperature heat exchanger, a pump, a first solenoid valve, a second sole... | 05/16/2006 |
| 6796375 | Cooling circuit A coolant circuit (10) includes at least one heat source (12), a radiator (14), and a bypass line (22), which connects a radiator inlet (18) to a radiator return (20) and whose junction (24) has a control valve (26... | 09/28/2004 |
| 6739389 | Waste heat recovering apparatus for an engine The absence or shortage of a heat transfer medium can be detected without any time lag. While the medium is circulated through a water jacket and an exhaust gas heat exchanger which receives heat from the exhaust gas, heat generated by the engine can be recovered. A... | 05/25/2004 |
| 6695046 | Variable speed fan motor control for forced air heating/cooling system A fan motor speed control system for controlling the fan motor speed of an air conditioning system includes a power output circuit including a power triac which is turned on and off by an opto-isolator connected to a pulse generator circuit for varying an... | 02/24/2004 |
| 6684944 | Variable speed fan motor control for forced air heating/cooling system A forced air heating and/or cooling system utilizing an induction type fan motor is controlled by a controller circuit which is operable to continuously vary the speed of the fan motor during a start-up phase and a shut-down phase of the heating and/or co... | 02/03/2004 |
| 6390381 | Control unit and process for adjusting the heating loops in large area heating systems and to control the adjusted heating loops A control system for the room temperature in large area heating systems comprises a feed-line manifold and a return-line manifold and for each heating loop an electrically activated throttle valve. A control-unit automatically adjusts the throttle degree ... | 05/21/2002 |
| 6352106 | High-efficiency pumping and distribution system incorporating a self-balancing, modulating control valve The present invention is a new self-balancing modulating control valve for use in a variable-flow fluid distribution system supplying a plurality of loads, which when installed at each load permits a smaller pumping head at all flow conditions. The purpos... | 03/05/2002 |
| 6176306 | Method and device for controlling operation of heat pump A method and device for controlling the operation of a heat pump having a primary heat system and an auxiliary heat system, and used to heat air circulating in an enclosure such as a building, the invention comprising a first sensor positioned in the retu... | 01/23/2001 |
| 6123147 | Humidity control apparatus for residential air conditioning system A system for controlling the humidity with a residential air conditioning system without compressor or air flow control employs a simple control technique of matching inlet air temperature prior to the refrigeration coils of the air conditioning system to... | 09/26/2000 |
| 6062296 | Regenerative heat recovery unit comprising heat accumulators tiltably movable to have a valve function A heat recovery unit comprising a case (1), which encloses at least one regenerative heat accumulator (5), whereby the casing (1) has a supply air opening (10), an exhaust air opening (15), an exterior air opening (20) and a under-air opening (25), and wh... | 05/16/2000 |
| 5971068 | Method and system for temperature control of hydraulic oil A combination of setting a correction value of an atmospheric temperature for each temporal section in response to a predicted value of a variation of the atmospheric temperature in a day and a delayed variation of a temperature of hydraulic oil due to th... | 10/26/1999 |
| 5960857 | System temperature control tank with integral modulator valve and flowmeter A machine for circulating cooling water through manufacturing process equipment includes a combination pump and heat exchanger assembly. The machine has a cast metal pump case with two upwardly opening sockets receiving the lower ends of two tanks, one of... | 10/05/1999 |
| 5838881 | System and method for mitigation of streaming electrification in power transformers by intelligent cooling system control An intelligent controller for on-line monitoring of circulation system in order to minimize a problem of streaming electrification and to avoid degradation of the electrical insulation of the system. The controller is designed to combine advantages of fuz... | 11/17/1998 |
| 5806582 | Method and arrangement for controlling heat transfer in ventilation Apparatus or air conditioning apparatus A method and an arrangement for controlling heat transfer in a ventilation apparatus or an air conditioning apparatus, in which heat contained in exhaust air is recovered into supply air by means of a heat transfer circuit having fluid circulation. Additi... | 09/15/1998 |
| 5730216 | Air conditioning and refrigeration units utilizing a cryogen Air conditioning and refrigeration apparatus for controlling the temperature of a conditioned space to a predetermined temperature band adjacent to a predetermined set point temperature via cooling and heating cycles utilizing a supply of pressurized cryo... | 03/24/1998 |
| 5318106 | Method and apparatus for controlling the flow of process fluids A method and apparatus for coupling a primary loop with a secondary loop for circulating processing fluids therebetween comprising in combination a first connection for the feed line of the primary loop and a second connection for the return line of the p... | 06/07/1994 |
| 5277034 | Air conditioning system An air-conditioning system for a cooling operation and a heating operation comprises a first heat exchanger to which a high-pressure and high-temperature refrigerant which has not been substantially cooled and adiabatically expanded after being compressed... | 01/11/1994 |
| 5197537 | Apparatus for controlling temperature of machine tool A temperature control apparatus for a machine tool includes four temperature sensors for detecting a reference temperature, outlet temperature of heat transfer fluid at an outlet of a heat exchanger, and temperatures of the heat transfer fluid at both inl... | 03/30/1993 |
| 5123252 | Method of operating a transport refrigeration unit A method of operating a transport refrigeration unit with microprocessor based control. The microprocessor automatically selects an operative control algorithm, according to system configuration, with each algorithm having one or more operating conditions... | 06/23/1992 |
| 4977752 | Transport refrigeration including methods and apparatus for optmizing same A transport refrigeration system having a refrigerant compressor which is selectively operable with either an electric motor or an internal combustion engine. The transport refrigeration system conditions a load space to a selected set point via heating a... | 12/18/1990 |
| 4922996 | Method and apparatus for heat recovery from hydraulic oil To reduce the heat present in hot hydraulic oil, the oil is passed through a heat exchanger in heat exchange relation with water. The temperature of the water entering the exchanger is at least 28° C. and the quantity of water circulated through the exch... | 05/08/1990 |
| 4667730 | Temperature regulating apparatus for a laboratory reaction vessel arrangement The temperature regulating apparatus for a laboratory reaction vessel arrangement, comprises a reaction vessel and a thermal chamber for a fluid heat exchange medium which at least partially surrounds the reaction vessel. A jacketing vessel is provided wi... | 05/26/1987 |
| 4589475 | Heat recovery system employing a temperature controlled variable speed fan An energy recovery system includes a source of fluid desired to be cooled which is passed through a heat exchanger which receives input air and passes it through the heat exchanger utilizing a temperature controlled variable volume fan controlled to assur... | 05/20/1986 |
| 4574870 | Method and apparatus for controlling a counter-flow heat exchanger A figure of effectiveness of a heat exchanger is maintained at a predetermined level, even when one of the input fluid flows varies in an incontrollable manner, without the need for flow meters to detect any flow variations. Temperature sensors are arrang... | 03/11/1986 |
| 4512387 | Power transformer waste heat recovery system Large power transformers such as used at electrical generating plants utilize oil for cooling with the heat removed by air cooled radiators. Several air cooled radiators are removed from the transformers and the oil circulated through plate heat exchanger... | 04/23/1985 |
| 4449569 | Method and apparatus for regulating fluid flows in parallel-connected conduits (e.g. in furnace installations having air preheaters and by-pass conduits) Fluid flow in parallel-connected conduits is regulated by sensing the pressures and/or temperatures at the junctions of the conduits, and regulating the supply of power to a fluid propelling means operable in one of the conduits in accordance with a signa... | 05/22/1984 |
| 4381814 | Control of heat transfer from heat exchangers in parallel The efficiency of a parallel heat exchanger arrangement is substantially maximized by utilizing the differential temperature across a first heat exchanger or group of heat exchangers in series to derive a set point for the differential temperature across ... | 05/03/1983 |
| 4217952 | Energy saving system for retrieving heat loss from an electrical apparatus In a system having an electrical apparatus dissipating thermal energy, an apparatus compartment is provided to substantially surround the apparatus, and a blower, disposed in an inlet air compartment, forces air through the apparatus compartment to an exi... | 08/19/1980 |
| 4114682 | Apparatus for heating, cooling or air-conditioning a room The invention relates to apparatus for heating and/or cooling a room which is large enough to require at least two heat exchanger units. Controls are provided which dependingly relate the outgoing air stream temperatures of the heat exchangers to avoid th... | 09/19/1978 |
| 4113005 | Waste heat boiler temperature control system A waste heat recovery system which can be attached to, and made part of, an existing thermal oxidizer-stack system, at minimum cost, without reducing the reliability of the existing oxidizer-stack system. It comprises a conventional heat transfer means, w... | 09/12/1978 |
| 4031950 | Process fluid circulation and temperature control system A process liquid circulation and temperature control system including a pump for circulating water or other process liquid through a path including a heating unit, a cooling unit, and a process apparatus that is returned to the pump; the pump and the heat... | 06/28/1977 |
| 3973618 | Electronic capacity control or direct expansion refrigeration of air conditioning systems The invention relates to the air conditioning of a storage compartment and is especially significant for a transport system. Air is circulated between an air tempering zone and the storage compartment, said air tempering zone having air cooling means and ... | 08/10/1976 |
