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MessagePosté le: Jeu 10 Mai 2018 - 10:39    Sujet du message: Christian Eriksen Hotspur Jersey Répondre en citant

An air door or air curtain is a device used for separating two spaces from each other Andre Gomes Barcelona Jersey , usually at the exterior entrance. The most common configuration for air curtains is a downward-facing blower fan mounted over an opening. Normally this opening is an entrance to a building, and the air curtain is intended to help keep flying insects out by creating forceful turbulence. It also helps keep outside air out Aleix Vidal Barcelona Jersey , avoiding cold drafts by mixing-in warm air from the air curtain. The fan must be powerful enough to generate a jet of air that can reach the floor.

The most effective air curtain for containing heated or cooled air inside a building with an open door will have a high face velocity at the opening, generated by top-down flow Xavi Hernandez Jersey , recovered by a recirculating air plenum and duct return to the source fans. This configuration is available for new construction, but difficult to provide in existing buildings. The air curtain is most effective with low exterior wind velocity. At higher wind velocities Thomas Vermaelen Jersey , the rate of air mixing increases and the outside air portion of the total face flow increases. Under ideal conditions of zero wind, the effectiveness of the air curtain is at its maximum.

For industrial conditions Sergio Busquets Jersey , high face velocities are acceptable. For commercial applications like store entrances, user comfort dictates low face velocities Sergi Roberto Jersey , which reduce effectiveness of separation of exterior air from interior air.

Non-heated air curtains are often used in conjunction with cold storage and refrigerated rooms. Airflow through a door depends on wind forces, temperature differences (convection) Samuel Umtiti Jersey , and pressure differences.

Air curtains can be used to save energy by reducing the heat transfer between two spaces, although a closed and well-sealed physical door is much more effective. A combination is usually utilized; when the door is opened air curtain turns on Rafinha Jersey , minimizing air flow from inside to outside and vice versa

A variety of installation options are available to cater for building and architectural features such as suspended ceilings but the most common is simply bolting the unit to the wall above the doorway and connecting a single phase supply and switch to the unit.

Power consumption is negligible for a normal sized doorway opening - about 300 W. Some units can even be specified with a heating element to warm an enclosed area.

Air curtains block the flow
An air curtain simply creates a block in the air flow through an opening. The air velocity of the curtain must then be great enough to direct the resulting velocity downward and ensure that a small part of the air stream goes out while the main air flow comes back into the room.

Canadian Air Systems Co. is a world's leading designer and manufacturer of industrial process air-curtains and environmental air barriers for a variety of industrial process applications. For special applications Canadian Air Systems offer high volume and high penetration tangential air curtains with highly laminar airflows.

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SANAA, Aug. 9 (Xinhua) -- A total of 15 food factory workers including six women were killed and eight others wounded in a series of Saudi-led airstrikes in the Yemeni capital Sanaa on Tuesday, a Xinhua correspondent at the scene reported.

The airstrikes destroyed the two food factory in Nahda quarter near the information ministry in downtown Sanaa.

Blood bath and bodies' parts were every where. Families of the victims crowded to search for their beloved relatives.

The relatives, women, children and men are crying. It's a brutal picture that cannot be imaged.

Sanaa, which is under control of Shiite Houthi group and it's ally forces of former President Ali Abdullah Saleh, has witnessed almost five months of calm with no airstrikes recorded.

Today, Sanaa turned into mess after dozens of airstrikes since dawn, in which several military targets including the presidential palace, the 1st military division base in south part of the capital were hit.

The main mountain bridge road linking Sanaa and southern provinces was destroyed, cutting off travel and food supplies between them.

The airport was shut down, and roads leading to it were closed, security officers and airport official told Xinhua.

Families were seen on vehicles with their belongings leaving Sanaa.

Residents in downtown the capital could hear sounds of artillery shelling from the northeast part of Sanaa, where Saudi-backed Yemeni government army are advancing in military attempts to recapture the rebel-held capital.

The situation here turned suddenly to a completely war zone. Residents expected things to get more worst. Armed Houthi fighters deployed everywhere in the streets and tall buildings.

Saudi Arabia intervened in Yemen's conflict in March 2015, nearly six months after Houthi group and Saleh forces stormed the capital Sanaa and drove out the internationally recognized government of President Abd-Rabbu Mansour Hadi to exile.

However, the Saudi-led Arab countries' coalition has since failed to restore President Hadi and his government to the power in the capital Sanaa.

The intervention triggered more devastating civil war that has so far killed over 6,400 people, mostly civilians, and displaced more than two million others.

The deadly dramatic military escalation came four days after UN-brokered peace talks in Kuwait between Yemeni parties broke down.

""Solution would not come through tanks, but via peace talks,"" said UN envoy to Yemen, Ismail Ould Cheikh Ahmed.
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