227 results about "Re circulation" patented technology

An improved solution for cooling a data center is provided. In an embodiment of the invention, a data center design that combines physical segregation of hot and cold air streams together with a data hall variable air volume system is provided. The invention is a data center design that resolves air management issues of re-circulation, bypass and load balance. Bypass is airflow supplied by the cooling units that directly returns without cooling servers. Recirculation airflow is server discharge warm air that returns directly without being cooled. Load balance is supplying the required server airflow. An embodiment includes physical segregation of cold and hot air streams and by providing variable air volume to match server load. Air segregation is done by enclosing the hot aisle end and above the cabinets. The air conditioning system provides variable air volume to the data hall (cold side) to meet server demands. The cooling plant consists of variable-air-volume air-cooling system, which cools air by air free cooling (economizer) and is supplemented with mechanical cooling in the warmer seasons.

A method of workload placement among servers includes receipt of a workload request. The method also includes selection of a group of servers from a set of servers capable of performing the requested workload. In addition, server workload indexes, which are ratios of temperature rises due to re-circulation load for the servers in the group of servers to temperature rises due to re-circulation load for the set of servers, of the servers in the group of servers are calculated. Moreover, the workload is placed on one or more of the servers in the group of servers based upon the server workload indexes of the servers in the group of servers.

An air conditioning unit may be controlled based on an index of performance designed to quantify re-circulation levels. For the air conditioning unit control, an index of performance set point is determined and the index of performance for a first iteration is measured. In addition, it is determined whether the measured index of performance for the first iteration equals or exceeds the index of performance set point. Moreover, a supply air temperature of the air conditioning unit is increased in response to the measured index of performance for the first iteration equaling or exceeding the index of performance set point.

In a method for evaluating one or more components in a data center, inlet and outlet temperatures of one or more heat dissipating devices are detected. In addition, the temperatures of air supplied by one or more computer room air conditioning (CRAC) units are also detected. Indices of air re-circulation for the one or more heat dissipating devices are calculated based upon the detected inlet temperatures, outlet temperatures and supplied air temperatures. The indices of air re-circulation are determined at various flow field settings of air delivered to the one or more heat dissipating devices and the one or more components are evaluated based upon changes in the indices of air re-circulation for the one or more heat dissipating devices at the various flow field settings.

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 along a cool aisle and a hot aisle. The index is calculated by dividing the enthalpy rise due to infiltration of heated air into the cool aisle and the total enthalpy rise of the heated air from the outlets of the one or more racks.

A system for reducing effects of adverse air re-circulation in a room containing at least one heat generating component includes an air conditioning unit configured to cool airflow in the room and at least one cooling vent tile operable to deliver the cooled airflow to the at least one heat generating component. The system also includes at least one secondary vent tile positioned and operated to one of, introduce airflow into a re-circulating airflow and remove airflow from a re-circulating airflow, to thereby respectively divert or vary the temperature of the re-circulating airflow and thereby reduce the effects of air re-circulation in the room.

Methods for simultaneous injection and aspiration of fluids during a medical procedure are disclosed. Embodiments include methods for operating medical devices within the subarachnoid space of the spinal column to gain access to the ventricles of the brain, as well as the surrounding cranial subarachnoid space. A dual lumen constant volume aspiration catheter is disclosed that injects a volume of injectable fluid to break up an obstruction within the brain or cranial subarachnoid space while simultaneously aspirating a same volume of aspirated fluid from the treatment site. Methods hereof include constant volume re-circulation of cerebral spinal fluid to and from a treatment area within one of the brain and the surrounding cranial subarachnoid space, which may be desirable during a ventriculostomy.

A furnace flow control valve for use within a bath of molten metal. The flow control valve includes a vertically-disposed elongated tubular stator, which is configured to receive flow from a molten metal pump. The valve has a rotor which is sealing rotatable within the stator between: a full re-circulation position, where flow from the pump passes un-hindered through the valve; a full transfer position, where flow from the pump is redirected into the vertically disposed stator and out of the valve; and a partial re-circulation/partial transfer position where flow from the pump both passes through the valve and is transferred up and out of valve through the stator.

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.

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.

The invention relates to a process or apparatus for transforming a first polymorph of a chemical material into a second polymorph of the same chemical material, utilizing an apparatus comprising a vessel connected to a re-circulation system, the process comprising the steps of: suspending said first polymorph in a solution to form a slurry in the vessel, re-circulating the slurry and removing the slurry from the vessel.

A method of allocating workload among servers in a geographically collocated cluster of compute equipment includes calibrating causes of heat re-circulation in the cluster of compute equipment. In addition, workload is allocated among the servers to address causes of the heat re-circulation to reduce costs associated with cooling the compute equipment.

One of the drawbacks common to many currently available low-temperature gas mixture separation techniques is that known systems and methods that embody the techniques are inefficient. In contrast to known systems and methods for low-temperature gas mixture separation, some embodiments of the present invention provide a system for low-temperature gas mixture separation that recycles energy and reduces power consumption by re-circulating heated and/or cooled flows (e.g. gas, liquid and mixed-phase flows) within the system. Accordingly, in some embodiments efficiency is somewhat improved, as compared to comparable systems that do not include the re-circulation of heat energy. In some embodiments the heat energy that is re-circulated is a combination of heat added to the system (i.e. inputs to the system) and heat released within the system (i.e. byproducts from within the system) that are subsequently recovered. In particular, some systems and methods provided in accordance with embodiments of the invention are suited for separating the constituent components of natural gas and other hydrocarbon gas mixtures.

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.

An apparatus for separating components of batches of waste rubber by pyrolysis comprises at least one heating chamber interconnected with a condenser by a conduit. The heating oven is provided with a plurality of cooperating heating elements, an inlet for receiving waster rubber, and an outlet for egress of pyrolyzed gaseous components. The condenser condenses and separates cooled liquid components from the gaseous components. Separated gaseous components are exhausted from the condenser. Cooled liquid components are conveyed from the condenser to a re-circulation tank. The conduit is provided with a pair of opposed injectors adjacent the outlet of the heating oven. A re-circulation line interconnects the re-circulation tank with the injectors and is provided with a pressurizing device for injecting cooled liquid components through the injectors into the conduit in the form of intersecting liquid laminar sheets thereby applying a vacuum draw on the egressing pyrolyzed gaseous components.

An interface region between a combustion liner and a transition duct of a gas turbine combustor is disclosed having improved cooling such that component life is increased and metal temperatures are lowered. An aft end of a combustion liner is telescopically received within the transition duct such that a combustion liner seal is in contact with an inner wall of the transition duct inlet ring. Increasing the dedicated cooling air supply to the combustion liner aft end, coupled with a modified combustion liner aft end geometry, significantly reduces turbulence and flow re-circulation, thereby resulting in lower metal temperatures and increased component life. Multiple embodiments of the interface region are disclosed depending on the amount of cooling required.