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What is an Air Curtain?

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An Air Curtain, also known as an air door, is a machine that blows a controlled stream of air across an opening to the other side to create an air seal. This seal separates different environments while allowing a smooth, uninterrupted flow of traffic and unobstructed vision through the opening. Because they help to contain heated or conditioned air, they provide sizable energy savings and increased personal comfort when applied in industrial or commercial settings. They also help to stop the infiltration of pollutants and flying insects.

 

 

How Does an Air Curtain Work?

  1. Once it is powered on, air is brought into the unit through the intake

  2. The air then enters the fan housing and is accelerated by the fan.

  3. This fast-moving air goes into a plenum, which allows for an even distribution of air along the full length of the discharge nozzle.

  4. Airfoil-shaped vanes in the nozzle create a uniform air stream with minimal turbulence.

  5. The air discharged through the nozzle creates a jet stream to the floor. Approximately 80% of the air returns to the intake side of the Air Curtain Door, and 20% goes in the opposite direction.

 

Why Use an Air Curtain?

  • Energy savings through control of air transfer

  • Energy savings due to shorter run times of air handler or compressor

  • Safe environment support by increasing ventilation and de-stratifying the air

  • Maintain employee/customer comfort

  • Reduce flying insect infiltration

  • Unhindered traffic flow & unobstructed visibility across the threshold

  • Increase productivity due to stable temperatures

  • Maintain usable space around the door

  • Elimination of ice and fog in cold storage areas

 

Do Air Curtains Cool a Room?

While Air Curtain Blowers are not the same as air conditioners, they are highly effective at maintaining the interior temperature, keeping cool air inside and warm air outside (or vice versa) when the door is open. They are sometimes referred to as “invisible doors” as they create an invisible barrier between inside and outside environments. Because they help to contain heated or conditioned air, they provide sizable energy savings and increased personal comfort when applied in industrial or commercial settings.

 

Do Air Curtains Keep Flies Out?

Yes! And mosquitos, yellowjackets, and bees. Air Curtain Fans, sometimes referred to as fly fans, supply a high velocity stream of air across a door or window opening that keeps pests like insects from entering the building. These flies and other small insects, find the air stream too powerful for them to fly through and if they try, they are blown down or sideways before they can enter the building.

How Much Does an Air Curtain Cost?

Electric Air Curtains can range in price depending on features, the application, and specific requirements. Consult a Berner sales rep today to get pricing on a model and control package that is best suited for your project.

 

Air Coolers, also known as evaporative or swamp coolers, cool an atmosphere by evaporating water. As air flows over water, certain particles on the water's surface are carried away. These particles take the heat with them, and this allows the air to cool. This is the main mechanism behind air coolers. Continue reading the article to know more about them.

How Does Air Cooler Work With Water?

Sweating also functions in the same way: the water particles on the skin's surface bring heat away with them as they evaporate, cooling the skin. It is also known that these air coolers are able to make use of 75% less energy as compared to the central air conditioners.

Evaporative coolers come in a variety of styles. A fine mist is sprayed into the air and then whipped out by a fan in some methods. Since the water in this mist is made up of fine droplets, it evaporates easily and absorbs heat from the air. In some other methods, the air is made to blow through a material that has been wetted. It can be blown through a fine mesh or past wet sheets, for example. This wet material then cools as it evaporates, and this, in turn, cools the air.


Ventilating a building simply replaces stale or foul air with clean, fresh air. Although the ventilation process is required for many different applications, the airflow fundamentals never change: Undesired air out, fresh air in. The key variables that do change depending on applications are the fan model and the air volume flow rate (CFM). Other considerations include the resistance to airflow (static pressure or SP) and sound produced by the fan (Sones). Sometimes you need a Exhaust Fan to perform a particular function, but it’s not clear which model to use or even what CFM is needed. If this is the case, you’ll need to do some fan specification work. Fan specification is not an exact science, but it can be done confidently when the fan application is understood.

Fans all perform the basic function of moving air from one space to another. But the great diversity of fan applications creates the need for manufacturers to develop many different models. Each model has benefits for certain applications, providing the most economical means of performing the air movement function. The trick for most users is sorting through all of the models available to find one that is suitable for their needs. Here are some guidelines.

 

An indoor Air Purifier ensures the filtration of air within an enclosed/closed place, which is processed then released as purified air. It operates as a complement to natural ventilation where it is possible to open windows.

 

It is vital to distinguish a professional model from a consumer device: they do not both guarantee identical air treatment or comparable overall performance.

A professional air purifier, equipped with a HEPA 13 or 14 filter, will operate effectively on pollens, fine particles PM2.5 and PM10, VOCs (Volatile Organic Compounds), viruses and bacteria. Finally, the device’s benign operation is key: that is to say the air purifier itself does not generate any secondary pollutants. To limit the diffusion of harmful residues, allergens or even viral elements; prevent asthma or allergy problems linked to poor indoor air quality to people at risk (children, elderly or sensitive people).

Home Air Purifier, not to be confused with an air ioniser or air humidifier, can be used as a preventative and/or therapeutic measure: at home, in enclosed offices, open spaces or coworking sites, shops, hairdressing salons, hotels or restaurants, medical and paramedical offices… By extension, as Covid-19 is obliging us, it is assuming an expanding rôle in schools, hospitals, medical and paramedical sectors, services.

 

posted Mar 16 by Aop12sd

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Failure analysis of a commercially pure titanium tube in an air conditioner condenser

Joining of titanium and stainless steel is challenging due to the formation of hard, brittle intermetallics. This study focuses on engineering ductile materials for joining transition metals. Friction welding of tube to tube-plate by an external tool, a novel solid state welding process was employed to join titanium tube and stainless steel tube plate. The interlayers engineered were copper, silver and Cu–Zn alloy. The micrographs revealed phase transformations in titanium tube and unaffected stainless steel base. Interface peak microhardness of 458 HV was observed for Ti/Cu–Zn/SS welded sample. The intermetallics formed were characterized by X-ray diffraction and scanning electron microscopy with energy dispersive spectroscopy. A novel shear test procedure was developed to evaluate the maximum shear load. It was found that joints with silver as interlayer withstood the maximum shear load of 56 kN. The shear surfaces were further analyzed and investigated for fracture study.

 

Titanium has today replaced copper alloys as the most favoured tube material for salt water cooled condensers. Main reason is the excellent corrosion resistance of titanium in chloride containing environments. The experience of titanium bar condensers is usually more than satisfactory, even if a few tube leaks have occurred. Possible damage mechanisms by high cycle fatigue, galvanic corrosion, water-droplet erosion and by flow-assisted corrosion are discussed. These perils can be handled by a number of adequate countermeasures analysed in laboratory work and meanwhile proven by plant service.

 

The corrosion resistance of titanium in sea water is extremely excellent, but titanium 、nickel 、zirconium tube are expensive, and the copper alloy tubes resistant in polluted sea water were developed, therefore they were not used practically. In 1970, ammonia attack was found on the copper alloy tubes in the air-cooled portion of condensers, and titanium tubes have been used as the countermeasure. As the result of the use, the galvanic attack on copper alloy tube plates with titanium tubes as cathode and the hydrogen absorption at titanium tube ends owing to excess electrolytic protection was observed, but the corrosion resistance of titanium tubes was perfect. These problems can be controlled by the application of proper electrolytic protection. The condensers with all titanium tubes adopted recently in USA are intended to realize perfectly no-leak condensers as the countermeasure to the corrosion in steam generators of PWR plants. Regarding large condensers of nowadays, three problems are pointed out, namely the vibration of condenser tubes, the method of joining tubes and tube plates, and the tubes of no coolant leak. These three problems in case of titanium tubes were studied, and the problem of the fouling of tubes was also examined. The intervals of supporting plates for titanium tubes should be narrowed. The joining of titanium tubes and titanium tube plates by welding is feasible and promising. The cleaning with sponge balls is effective to control fouling.

 

Titanium is the ninth most abundant element in the earth's crust and the fourth most commonly used structural metal. In nature, it occurs only as a mineral (ore) in combination with oxygen or iron (rutile, TiO2, or ilmenite, FeTiO3).

 

Titanium is a lightweight material whose density is approximately 60 percent of steel's and 50 percent of nickel and copper alloys'. It was recognized in the 1950s as a desirable material for aerospace applications—especially airframe and engine components. In the 1960s and 1970s, titanium was considered for use in vessels and heat exchangers in corrosive chemical process environments. Typical applications included marine, refinery, pulp and paper, chlorine and chlorate production, hydrometallurgy, and various other oxidizing and mildly reducing chemical services.

 

In the 1980s and 1990s, titanium began to be used for many nontraditional applications, including tubulars for geothermal energy extraction and oil and gas production, consumer goods (such as sporting equipment), food processing, biomedical implants, and automotive components.

 

According to the U.S. Geological Survey (USGS), 52 million pounds of titanium were produced in the U.S. in 2000; worldwide, more than 100 million pounds were produced.

 

Titanium sponge is obtained by reacting rutile ore with chlorine and coke, followed by magnesium (Kroll) reduction and then vacuum distillation to remove excess magnesium and magnesium chloride. Titanium sponge is pressed into blocks to make a consumable electrode and then melted in an inert environment under vacuum to produce a titanium ingot.

 

Titanium is well-known for its unique combination of properties, which include low modulus of elasticity, stable and steadfast oxide film (which provides excellent corrosion and erosion resistance), and a high strength-to-density ratio.

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