231 results about "Re circulation" patented technology

Apparatus and method are provided for facilitating cooling of an electronics rack employing an air delivery structure coupled to the electronics rack. The air delivery structure delivers air flow at a location external to the electronics rack and in a direction to facilitate mixing thereof with re-circulating exhausted inlet-to-outlet air flow from the air outlet side of the electronics rack to the air inlet side thereof. The delivered air flow is cooler than the re-circulating exhausted inlet-to-outlet air flow and when mixed with the re-circulating air flow facilitates lowering air inlet temperature at a portion of the air inlet side of the electronics rack, thereby enhancing cooling of the electronics rack.

A blood purification device confirms whether a specific peak is provided by e.g. an ultrafiltration pump, to concentrate the blood or not and also accurately measures a blood re-circulation with a minimum of parameters providing a ratio of re-circulating blood. The blood purification device composed of arterial blood circuit route 1a and venous blood circuit route 1b, blood pump 3, dialyzer 2, water removal pump 8 providing the specific peak in the variation of blood concentration by removing water rapidly, and a detector detecting the specific peak, can measure the blood re-circulation thereby. The re-circulating blood flowing is the blood which was introduced again to arterial blood circuit route 1a after it had been returned to a patient from venous blood circuit route 1b. A first detector 5a installed in the arterial blood circuit route 1a and a second detector 5b installed in venous blood circuit route detector.

A temperature control system having a re-circulation loop that uses valves to selectively circulate a temperature control fluid through a cooling system, through a heating system, or through a through passage so as to controlling the temperature of the temperature control fluid, which, in turn, controls the temperature of a target. A temperature sensor monitors the target's temperature. A controller controls valve operation in response to the temperature measured by the temperature sensor to obtain a predetermined target temperature. Beneficially, the controller controls the target's temperature according to a predetermined temperature profile. Continuous etching along a predetermined temperature profile is possible.

Sensor systems and methods are disclosed, which generally incorporate isolation between the sensor's electronics and the sensed media. The sensor's electronic circuit can incorporate one or more application specific integrated circuit (ASIC) that processes and outputs the signal for both absolute and differential measurements. Such a sensor can be adapted for use in exhaust gas re-circulation (EGR) systems utilized with automotive gasoline engines. Such a sensor can also be utilized for measuring differential pressure across diesel particular filters and / or applications in which differential pressure is required for system control and / or monitoring purposes. The absolute pressure sensor disclosed herein can therefore sense the exhaust pressure on automotive engines and other mechanical and / or electromechanical devices and machines.

An engine management system uses physically based models to determine the composition and mass of the fresh air / exhaust gas mixture suctioned by an internal combustion engine. The models are closely coupled to each other in a partial manner and are used to simulate the filling of the combustion chamber with the suctioned fresh air / waste gas mixture in order to simulate the flow of the mass of re-circulating exhaust gas, the behavior of the exhaust gas manifold upstream and downstream from a turbine, the storage behavior of the intake manifold, and the behavior of the intake pipe or inlet manifold whereby the fresh air / exhaust gas mixture is fed to the combustion engine from a corresponding mixing point where the suctioned fresh air is mixed with the exhaust gas re-circulated via the exhaust gas re-circulation line. As a result, a plurality of additional state variables can be determined without additional sensors.

The present invention relates to apparatus and method for re-circulating high viscosity liquids. The apparatus comprises a recirculating probe coupled to a fluid storage and dispensing vessel by a connector, and the recirculating probe comprises: (a) a dip tube defining an output flow path; (b) an output port; (c) a recirculating port; and (d) a return flow path. The output flow path and the return flow path preferably have substantially equal cross-sectional areas, which reduce or eliminate the unbalance between the discharge pressure in the output line and that in the re-circulation line, and prevent premature wearing-out of the dispensing / recirculating pump. The output flow path and the return flow path can also be concentric to each other, which not only maximizes the effective flow area for both output and return flow paths within the limited cross-sectional area of the opening of the fluid vessel, but also avoids liquid turbulence and / or formation of air bubbles caused by free-fall drip introduction of the re-circulated liquid that is commonly observed in conventional recirculating probe designs.

A fluid delivery system includes a print cartridge and a fluid supply. The print cartridge includes a housing structure, an air-fluid separator structure within the housing structure, including an air vent region in communication with the seperator structure. A fluid ejector is mounted to the housing structure, and a fluid plenum within the housing structure is in fluid communication with the fluid ejector. A fluid reservoir in the housing structures is in fluid communication with the plenum for supplying fluid to the plenum under negative pressure. A fluid re-circulation path is provided in the housing structure through the separator structure and the fluid plenum. A pump structure re-circulates fluid and air through the re-circulation path during a pump mode. The fluid supply is continuously or intermittently fluidically coupled to the fluid reservoir.