52results about How to "Reduce hydraulic resistance" patented technology

The present invention relates to articles and heat storage devices for storage of thermal energy. The articles include a metal base sheet and a metal cover sheet, wherein the metal base sheet and the metal cover sheet are sealingly joined to form one or more sealed spaces. The articles include a thermal energy storage material that is contained within the sealed spaces. The sealed spaces preferably are substantially free of water or includes liquid water at a concentration of about 1 percent by volume or less at a temperature of about 25° C., based on the total volume of the sealed spaces. The articles include one or more of the following features: a) the pressure in a sealed space is about 700 Torr or less, when the temperature of the thermal energy storage material is about 25° C.; b) the metal cover sheet includes one or more stiffening features, wherein the stiffening features include indents into the sealed space, protrusions out of the sealed space, or both, that are sufficient in size and number to reduce the maximum von Mises stress in the cover sheet during thermal cycling; c) the metal cover sheet and / or the metal base sheet includes one or more volume expansion features; or d) the metal cover sheet has a thickness, tc, and the metal base sheet has a thickness, tb, wherein tc is greater than tb; so that the article is durable. For example, the article does not leak after thermal cycling between about 25° C. and about 240° C., for 1,000 cycles.

The present invention relates to catalysts and methods for producing hydrocarbons, including liquid synthetic fuels, olefins, solid hydrocarbons, as well as oxygen-containing derivatives thereof (for example, alcohols) from a mixture of CO and hydrogen (syngas). The problem to be solved by the present invention is to provide an effective catalyst and a process for the catalytic production of hydrocarbons and their oxygen-containing derivatives from synthesis gas with a high productivity per volume unit of a reactor. The process is carried out by passing carbon monoxide and hydrogen through one or more stationary particles (bodies) of a concentrated permeable catalyst containing at least 0.4 g / cm3 of an assembly of phases comprising a phase of a catalytically active metal, fixed on a phase of a support of oxidic nature, producing an appreciable influence on the dispersity of the active metal phase or on other physicochemical properties thereof, wherein the catalyst body has a permeability of at least 5·10−15 m2. One of Group VIII metals or an intermetallic containing them is used as the catalytically active metal, wherein the content of the catalytically active metal phase in the assembly of the phases is at least 5 wt. %.

A pump includes a two-stepped cylinder with cavities and a lower intake valve, and is connected to a tubing-string via a sub, which includes an upper intake valve and discharge valve. A hollow plunger is arranged in the cylinder below and above the cavities. The plunger is connected to a hollow rod and has a lower discharge valve and a through-hole provided above the lower discharge valve to provide communication between the plunger cavity and a chamber formed as said plunger is moved downwards in a lower step of the cylinder. An upper step of the cylinder includes an inner diameter which is smaller than the inner diameter of the tubing-string. The upper discharge valve is a bush arranged on the rod with longitudinal movement upwards along said rod with excess pressure in the cylinder cavity above the plunger, and downward movement in the liquid under its own weight.

The invention provides a lighting device comprising a light source and a heat sink (200). The heat sink (200) is configured to dissipate thermal energy from the light source when in operation. The heat sink comprises a plurality of pin-shaped fins (210) and a support (220), wherein each fin (210) has a fin height (h) relative to the support (220), a bottom part (213) associated with the support (220) and a top part (214), a cross-section having a first width (d1) and a second width (d2) having a ratio d1 / d2 selected from the range of 1.2-10, and a first width axis, wherein the first width axes of the pin-shaped fins (210) are arranged parallel, and wherein the pin-shaped fins (210) are hollow over at least part of their fin height (h).

Disclosed is an apparatus for efficiently removing ions contained cooling water used in cooling a fuel cell stack. More specifically, the present invention removes ions by trapping ions contained in cooling water using a permeable membranes capable of making ions selectively pass therethrough and electrodes which are configured to attract ions. The present invention can reduce electric power consumption in pump and can modify the overall performance of the system to cope with various environmental conditions.

A bubble cap (400) has a cap (430) with at least one slot (495) and a riser (420), configured with a skirt height (460) of at least 4 cm, such that 1.5*Skirt Height (cm)+[Slot Length (cm)−Exposed Slot Height (cm)] is greater than or equal to 7.5, and posed such that a liquid fluid and a gas flow co-currently upwardly in a space between the riser (420) and the cap (430).

A bubble cap (100) has a riser (120) and a cap (130), separated by a divider (140) that extends to a length at least 50% of a distance measured between the top of the riser (122) and the bottom of the cap (134). In another aspect, the riser (120) and cap (130) cooperate to provide a skirt height (160) of no less than 1.5″. More preferred bubble caps (400) have a relatively high skirt height (460) or long slit length (497), or both. In yet another aspect, flow-redirecting vanes (610) and plates (630) cooperate to provide a rough distribution of fluids to subsequent distribution tray (650).

A bubble cap has a riser and a cap, separated by a divider that extends to a length at least 50% of a distance measured between the top of the riser and the bottom of the cap. In another aspect, the riser and cap cooperate to provide a skirt height of no less than 1.5″. More preferred bubble caps have a relatively high skirt height or long slit length, or both. In yet another aspect, flow-redirecting vanes and plates (e.g., mixing chamber floor and splash deck) cooperate to provide a rough distribution of fluids to subsequent distribution tray(s).

This invention relates to nuclear engineering and may be used in structures of nuclear fuel assemblies, especially those used in PWR and BWR nuclear reactors. A fuel assembly comprises spacing grids comprising cells formed by orthogonal crossing plates. An insertable spacing element is installed in each cell, which is designed for fixing the fuel rod passing through the cell. In the spacing grids that are arranged between the first spacing grid and the last spacing grid downstream the coolant flow at least some cells, through which the fuel rods pass, are provided with deflectors designed for mixing the coolant flow. The insertable spacing element comprises a shell, which has a cross-section in the form of an octagon formed by four facets that are rounded and convex in the direction from the center of said element and by four facets located therebetween that are shaped and concave toward the center of the said element. The result is that cell stiffness is increased, and hydraulic resistance to a coolant flow is reduced.

This invention relates to nuclear engineering and may be used in structures of nuclear fuel assemblies, especially those used in PWR and BWR nuclear reactors. A fuel assembly comprises spacing grids comprising cells formed by orthogonal crossing plates. An insertable spacing element is installed in each cell, which is designed for fixing the fuel rod passing through the cell. In the spacing grids that are arranged between the first spacing grid and the last spacing grid downstream the coolant flow at least some cells, through which the fuel rods pass, are provided with deflectors designed for mixing the coolant flow. The insertable spacing element comprises a shell, which has a cross-section in the form of an octagon formed by four facets that are rounded and convex in the direction from the center of said element and by four facets located therebetween that are shaped and concave toward the center of the said element. The result is that cell stiffness is increased, and hydraulic resistance to a coolant flow is reduced.

A pump includes a two-stepped cylinder with cavities and a lower intake valve, and is connected to a tubing-string via a sub, which includes an upper intake valve and discharge valve. A hollow plunger is arranged in the cylinder below and above the cavities. The plunger is connected to a hollow rod and has a lower discharge valve and a through-hole provided above the lower discharge valve to provide communication between the plunger cavity and a chamber formed as said plunger is moved downwards in a lower step of the cylinder. An upper step of the cylinder includes an inner diameter which is smaller than the inner diameter of the tubing-string. The upper discharge valve is a bush arranged on the rod with longitudinal movement upwards along said rod with excess pressure in the cylinder cavity above the plunger, and downward movement in the liquid under its own weight.

A dam-free hydro-power plant for generating electricity comprises a convergent-divergent water passage including a cylindrical neck containing a shutter, branch pipes connected with the neck, each branch pipe including a reverse valve capable of triggering, depending on the stream direction in the passage. A first and second branch pipes are located in front of the shutter, a third and fourth branch pipes are located behind thereof, a first and second buffers accumulating respectively higher-pressure liquid and lower-pressure liquid, the buffers are communicated through a cross-flow pipeline enclosing a turbine joined with an electro-generator. The first buffer is communicated with the neck via the first and the third branch pipe, whereas the second buffer is communicated with the neck via the second and the fourth branch pipe. The plant is highly efficient due to deploying hydro-impact, and particularly usable in places of tidal activities, in freezing rivers for all-year-round generating electricity.

An energy storage element of an energy storage assembly includes a cylindrical body and a channel formed in an axial direction in an internal thereof; wherein the cylindrical body includes an energy storage material. With the energy storage element having a cylindrical body, the shape of the energy storage element is of the merit of low hydraulic resistance, which allows air flow to pass through the energy storage element(s) smoothly at great speed.

A device for the tangential filtration of liquids at high viscosities is taught. For a given channel length and width (relatively fixed by the cassette design), one can decrease the channel pressure drop by increasing the channel height or reducing the channel hydraulic resistance. One can increase the channel height by using a larger diameter fiber in the screen, by increasing the thickness of the molded border or nm on the overmolded screen or by using a thicker nonwoven as a spacer in a non-overmolded screen. Since the screen is embossed into the surface of the membrane: the effective channel height Is also affected by the hardness of the membrane -as well as the fibers In the screen.

A damper device (10) of a hydraulic unit of a vehicle brake device is designed with a damper chamber (26) whose chamber volume is variable, and a throttle (36) arranged downstream of the damper chamber (26). According to the invention, the throttle (36) has a variable throttling effect and this throttle effect is variable as a function of the chamber volume.

A mixing device includes a first inlet (84) and a second inlet (86) inlet and an outlet (80). The first inlet (84) is connected to the outlet (80) via a first flow connection and the second inlet (86) is connected to the outlet (80) via a second flow connection. A circulation pump assembly (24; 46) includes an electric drive motor (30), a control device (34), for controlling the speed of the drive motor (30), and at least one impeller (68; 100) driven by the drive motor. The at least one impeller (68; 100) is positioned in the first flow connection. The flow connections are configured such that at least one hydraulic pressure generated by the impeller (68; 100) in the first flow connection acts as hydraulic resistance in the second flow connection.