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16. Fill in the blanks with the following prepositions or adverbs where necessary:

about; at; of; into; frequently; in; for; therefore; near; despite; possibly; out.

  1. Air-conditioning may be divided … two main sections: one … the processing … materials … industry; the other … human com­fort.

  2. It has been found that there is an optimum condition … temper­ature and humidity … which the processing … different materials may be carried … with the minimum … wastage and the maximum … goods' quality.

  3. The system is … designed to produce air … predetermined temperature and moisture content and to keep it so … all external influences.

  4. Conditioning air … human comfort may be divided … two main sections – winter and summer.

  5. … the systems in­stalled … office buildings provide control during both seasons.

  6. The control … air purity can be achieved … various degrees.

  7. As a minimum control some sort … filtering must be done … the en­trance … the air-conditioning system.

  8. … the most efficient fil­tering device is the electrostatic precipitator.

  9. To avoid stuffiness, the air should be given a certain amount … motion.

  10. In summer time much greater air motion is needed, enough to change the air … a room completely … three to ten times per hour.

17. Find in the text answers to the following questions. Work in pairs. Use such expressions as:

I think/ suppose/ consider/ believe; to my mind/ in my opinion; as far as I remember/ know/ understand; Let me see…; How shall I put it?; Well, let me think…; Let's put it this way…; I'll have to think about that; The best way I can answer that is…; That's a good question.; That's a difficult question.

  1. How can air-conditioning be defined?

  2. What sections is it divided into?

  3. What services does air-conditioning provide?

  4. What are the basic pieces of equipment for air-conditioning?

  5. How are desirable conditions inside the house brought about?

18. Give the definitions to the following terms:

 processing

 furnace

 purity

 attic

 uniform

 prevent

19. Match the following definitions with their terms:

1. the amount of water in the air

a. achieve

2. a current of air that comes into a place in an undesirable way

b. install

3. to succeed in doing something or causing it to happen, usually after a lot of effort

c. filter

4. to put a piece of equipment, so that it is ready to be used

d. outlet

5. to pass a substance through a device which is designed to remove certain particles contained in it

e. humidity

6. a hole or pipe through which liquid or air can flow away

f. draught

20. Speak on the following topics:

  • The objectives of air-conditioning.

  • The services provided by air-conditioning.

  • The process of bringing about desirable conditions inside the house.