Task 2. Read the text and translate using the dictionary.

There are many different kinds of chillers used in industrial process. Chillers are used to cool machines, prevent sparks and other problems while fashioning parts, keeping rooms cool, and preventing liquids from evaporating. There are water chilling machines, air chilling machines, evaporator chilling machines, and vapor compression chilling machines. This wide variety of chilling machine types make it possible for any industry to find the best cooling system for their unique needs.

In general, water-cooled systems are the most efficient and effective, followed by evaporated systems and vapor compression systems, and with air chilling machines as the least effective chilling model. However, some factories still choose to use air cooling systems due to a lack of water in the area or in situations where the presence of moisture could damage a delicate manufacturing process.

Factories get to choose between centralized chilling systems and decentralized chilling systems. A centralized chilling system is located in a central location and has pipes connecting the chilling system to the other machines in the factory. A decentralized chilling system gives each machine its own specific cooling machine. Factories that have many machines that require the same cooling power often choose centralized systems, while factories that have machines that require different cooling temperatures and techniques typically choose decentralized systems. Some factories have both if the majority of machines use the same cooling temperature and method with a select few requiring their own special cooling systems.

There is no one cooling system that is better than another in a factory. Other than the efficiency ratings of the different chilling styles, there is no great benefit from choosing one system over another. Factories can save money by using a centralized system, but not every factory can use a centralized chilling system to keep machines and manufacturing processes cool.

Task 3. Answer the questions according to the text:

1) What is chillers?

2) What kinds of chillers do you know?

3)  What is the most efficient and effective?

4) Factories get to choose between centralized chilling systems and decentralized chilling systems, don’t they?

5) What differences between centralized and decentralized chilling systems?

Task 4. Make thesis plan to the text.

Task 5. Find terms and term-combinations from the text and make some sentences with them.

Task 6. Filling the gaps:

1) There are many different kinds of _____ used in industrial process.

2) There are water chilling machines, _____chilling machines, evaporator chilling machines.

3) In general, _______systems are the most efficient and effective.

4) Some _______still choose to use air cooling systems.

5) Factories get to choose between ______chilling systems and decentralized chilling systems.

6) A ________chilling system gives each machine its own specific cooling machine.

7)  Some factories have _____if the majority of machines use the same cooling temperature.

8) There is no one cooling system that is ______than another in a factory.

Task 7. Try to translate the following sentences into your native language.

1. This wide variety of chilling machine types make it possible for any industry to find the best cooling system for their unique needs. 2. In general, water-cooled systems are the most efficient and effective, followed by evaporated systems and vapor compression systems, and with air chilling machines as the least effective chilling model.3. Factories get to choose between centralized chilling systems and decentralized chilling systems. 4. There is no one cooling system that is better than another in a factory.

SSW

Task 1. Make a PowerPoint Presentation

Theme6 .Equipment for mixing particulate solids

Task 1.Topical vocabulary:

2. Read and translate the text into your native language:

Equipment for mixing particulate solids

Mixers for powders fall into two categories:

1. Diffusive (passive) mixers: in this type of mixer, homogeneity is achieved as a result of the random motion of the particles when the particle is in flow under the effect of gravity or vibration, without mechanical agitation. The mechanism is assimilated to ‘diffusion’, in reference to the random movement of molecules. There is almost no shear. Consequently, these mixers are particularly suitable for particulates that require gentle mixing, such as fragile agglomerates, but they do not perform well with cohesive powders.

2. Convective (active) mixers: in this type of mixer, mixing is achieved by mechanical agitation. Parts of the bulk material are ‘conveyed’ with respect to each other by the action of impellers or turbulent gas flow. Shearing occurs and may be considerable.

In practice, most powder mixers function by a combination of both mechanisms. In addition to mixing, powder mixers may perform other functions in powder processing technology. Some of these additional functions are: 

1. Particle coating

2. Agglomeration

3. Admixture of liquids (such as fat into a dry soup mixture)

4. Drying

5. Size reduction, change of particle shape.

The drum blender consists of a horizontal cylinder rotating about its axis. Its mixing action is essentially diffusive. The powder to be mixed is placed inside the drum. As the drum rotates, the powder is lifted up, until the angle of repose is exceeded. At that point, the powder falls back on the rest of the bulk and enters a new cycle of lifting and falling. Diffusive mixing takes place during the residence of the powder in air, while falling. Continuous operation can be made possible by tilting the drum.

Answer the questions

1. What is diffusive (passive) mixers?

2. What is the mechanism?

3. What is convective (active) mixers?

4. What kind of additional functions do you know?

5. What does the drum blender consist of?

Put prepositions

  Diffusive (passive) mixers: … this type … mixer, homogeneity is achieved … a result … the random motion … the particles when the particle is … flow … the effect … gravity or vibration, … mechanical agitation. The mechanism is assimilated … ‘diffusion’, … reference … the random movement … molecules. There is almost no shear. Consequently, these mixers are particularly suitable … particulates that require gentle mixing, such … fragile agglomerates, … they do not perform well … cohesive powders.

5. Retell the text Mixers for powders fall into two categories: