625 results about "Enhanced heat transfer" patented technology

A shut-off type diaphragm valve adapted for use in an atomic layer deposition system includes a valve seat having an annular seating surface that surrounds an inlet of the valve and extends radially therefrom. The seating surface contacts a substantial portion of the first side of a flexible diaphragm when the diaphragm is closed, to facilitate heat transfer and counteract dissipative cooling of the diaphragm, thereby inhibiting condensation of a medium flowing through the valve passage. The seating surface is preferably flat and smooth, to prevent shearing of an elastomeric diaphragm. For a plastic diaphragm, a ring-shaped seating ridge may extend from the seating surface to cause localized permanent deformation of the diaphragm and enhanced sealing, while still allowing a substantial portion of the diaphragm to contact the seating surface for enhanced heat transfer. Valve speed enhancements and other reliability enhancing features are also described.

An improved cooling design and method for cooling airfoils within a gas turbine engine is provided which includes a plenum longitudinally located within the leading edge of the airfoils. Within the plenum are positioned a plurality of turbulence promoters to provide enhance heat transfer within the leading edge. Also, the cooling design includes a plurality of inlets to receive cooling air from an internal cavity of the airfoil as well as a plurality of outlets located within a trench on the exterior surface of the leading edge through which the cooling air exits to film cool leading edge.

A composition for enhanced heat transfer fluid performance, comprising a base heat transfer fluid and a nanometer sized phase change material. Introduction of nanometer sized phase change material into the heat transfer fluid leads to improved, high reversible thermal transport properties at elevated temperatures while ensuring low viscosity of the fluid at sub-freezing temperatures. A method for preparing of the heat transfer fluid with enhanced heat transfer performance, comprising making nanometer sized capsules having the phase change material contained therein and dispersing the capsules into the base heat transfer fluid.

LNG facility employing one or more vertical core-in-kettle heat exchangers to cool natural gas via indirect heat exchange with a refrigerant. The vertical core-in-kettle heat exchangers save plot space and can be use to reduce the size of cold boxes employed in the LNG facility. In addition, vertical core-in-kettle heat exchangers can exhibit enhanced heat transfer efficiency due to improved refrigerant access to the core, improved refrigerant circulation around the core, and/or improved vapor/liquid disengagement above the core.

A heat exchanger with mini channels or micro channels provides enhanced heat transfer abilities. One or more surfaces of the channels may be covered with a nanostructure, such as single walled carbon nanotubes or multiwalled carbon nanotubes. The nanostructures may fully cover the entire surface of the channel or a selected surface area of the channel. Further, the nanostructures may be arranged into multiple patterned bundles covering the surface of the channel.

The invention relates to an inner boundary layer cutting disturbing radial mixed flow device of a heat exchange pipe, which belongs to an inner insertion element enhanced heat transfer device of a heat exchange pipe of pipe type heat exchange equipment. The device consists of a rotor (or a plurality of rotors), pipe end hanging elements, a support shaft and position limiting rivets, wherein two pipe end hanging elements are respectively fixed at both ends of the heat exchange pipe, one or a plurality of rotors are arranged in the heat exchange pipe, the rotors can be ranged in groups, each group is separated through the position limiting rivets, the support shaft passes through shaft holes of the rotors and the position limiting rivets, and both ends of the support shaft are fixed on the pipe end hanging elements. Each rotor consists of a driving wing, a disturbing wing, a support ring and a shaft hole, the fluid in the heat exchange pipe can be divided into two parts: a driving region and a cutting disturbing region, the disturbing wings can be straight wings or spiral wings in the opposite direction to the rotating direction of the driving wings, and in addition, small gaps are formed between the pipe walls and the disturbing wings for realizing the sufficient cutting disturbing on the boundary layer of the fluid. The device per se has the double functions of on-line cleaning and enhanced heat transfer in the heat exchange pipe through the enhanced fluid boundary layer cutting disturbing and radial mixed flow effect.

The invention relates to a trapping method of carbon dioxide, namely a method for multi-tower vacuum pressure and temperature varying coupling adsorbing and concentrating the carbon dioxide. The method comprises the following main steps: (a) under the conditions of 10-50 DEG C of temperature and 1.1-5.0 atm of pressure, adopting an adsorbent for adsorbing the carbon dioxide to adsorb the carbon dioxide in flue gas; (b) under the conditions of 80-150 DEG C of temperature and 1-10 kPa of vacuum, desorbing the adsorbent in step (a), and cooling the obtained gas containing the carbon dioxide to enter a gas collector. The method has the advantages that under the auxiliary condition of heating temperature rising, the adsorbent is desorbed in vacuum, and the power consumption and the cost of vacuum equipment are reduced; pipe-shell absorbers or the absorbers of enhanced heat transfer elements of tower inbuilt fin type, coils, and the like to increase the indirect heating and cooling efficiency; and adopting low-temperature exhaust gas discharged from the top end of an adsorption tower to directly regenerate a post adsorbent in a bed to shorten the cooling time. Compared with the prior art, the method reduces the trapping and post processing cost of the carbon dioxide.

The invention discloses an inner groove porous strengthened boiling micro-channel structure, which includes a metal sintered felt formed by sintering metal powder and provided with uniformly-distributed particles, wherein a plurality of inner grooves are uniformly distributed in the metal sintered felt. The porous surface of the inner groove porous strengthened boiling micro-channel structure has excellent capillary characteristics, can keep the wall surface to be sufficiently damp, avoids the local scabbing and polymer deposit caused by hot spot and local drying, improves the heat transfer coefficient and critical heat flux density by adopting the porous structure for strengthened boiling heat transfer, and has excellent strengthened heat transfer effect.

Embodiments of the present invention are related to an electrode for a plasma arc torch, the electrode comprising a generally tubular outer wall, an end wall, and a protrusion. The end wall is joined to a distal end of the outer wall and supports an emissive element in a generally central region. The protrusion extends from the generally central region of the end wall and is configured to connect with an electrode holder by a releasable connection, wherein the protrusion is configured such that at least one coolant passage forms between the protrusion and the electrode holder when the electrode is connected with the electrode holder. In some embodiments, the releasable connection comprises a threaded connection, wherein the protrusion is threaded to releasably connect to a threaded coolant tube of the electrode holder. In other embodiments, at least one coolant passage is defined by the threaded connection.

A heat transfer structure includes a heat transfer module having a plurality of heat transfer members in the duct chamber with the density increased in the direction of the flow of the coolant and having a greatest density adjacent to the position of a heat source attached in thermal contact with the heat transfer module. The profile of the duct chamber is adjusted to the position of the heat source to increase the velocity of coolant directly under the heat source and to partially or completely block the coolant flow to the areas which do not need to be temperature adjusted. The heat transfer members may be formed as pin fins fabricated from springs compressed to a predetermined density in a direction perpendicular to the longitudinal axis of the spring (and/or in parallel to the longitudinal axis of the heat transfer module).

New lithium ion batteries and methods useful in making lithium ion batteries and/or components thereof are provided. The present lithium ion batteries and/or components thereof are structured to allow enhanced ion diffusion into and out of an active material through an electrolyte and to provide enhanced heat transfer out of the active material. The present methods provide electrodes with enhanced porosity without employing a separate porosity additive or a separate electrolyte percolation additive.

An electrohydrodynamically enhanced heat transfer system (EHD) includes an electrode completely encapsulated in an insulating material and coupled to a power supply to generate an electric field between a heat transfer surface and the encapsulated electrode when energized for interacting with the heat exchange surface and the working media to reduce frost formation on the heat transfer surface and to enhance heat transfer. The power supply may be completely encapsulated and immersed into the working media. In order to reduce accumulation of condensed liquid onto the electrode, the surface of the insulating material of the encapsulated electrode is either covered with a water repellent, or heated a few degrees above the dew point temperature of the air surrounding the heat transfer surface. The encapsulated electrode can be energized by an AC or DC electric field through a controlling switch.

A system combines the thermal conductivity characteristics of certain solids with the high specific heat values of appropriate fluids to enhance the overall heat transfer characteristics of a heat exchanger. The system comprises a fluid channel disposed in a heat exchanger unit with a slurry as the convective heat transfer medium. The slurry comprises an appropriate fluid with field reactive particles suspended therein. Field emitters are located along the walls of the fluid channel whereby the distribution of particles within the slurry is manipulated to achieve enhanced heat transfer characteristics.

One embodiment of the cooling module is implemented as a device having a heat sink and an integrated synthetic jet actuator. The heat sink is configured to have a channel and a jet distribution system associated with the synthetic jet actuator directs fluid flow into the channel of the heat sink. In operation, the fluid flow of this embodiment of the cooling module comprises a synthetic jet stream and ambient fluid entrained into the channel by the synthetic jet stream. The fluid flowing through the channel serves to a wall of the heat sink channel.

One embodiment of the system is implemented as a device for two-phase heat transfer. This device comprises a chamber containing a fluid, where a heated wall makes up a portion of the chamber. The device also comprises an actuator that emits pressure vibrations. The pressure vibrations dislodge vapor bubbles that form at the heated wall due to the heat in the wall.

A composite material for storing thermal energy at various temperatures (30° C. to 450° C.) formed by an elastomer matrix into which a phase change material such as an inorganic salt is encapsulated. The material is characterized by a high volumetric thermal conductivity, a low density, a highly interconnected porosity and a relatively high modulus of elasticity. The significant properties of the matrices are: a large amount of energy involved in full melting/crystallization, a fairly low relative volume expansion upon melting and fairly low sub-cooling. The main advantages of the resulting composites are a very high energy density, a relatively low volume expansion, highly enhanced heat transfer, thermo adaptability, stability and insignificant hysteresis.