11. Choose the right word or word–combination.

1. An air–conditioning unit is based on the principle that cooled air reaches saturation and loses moisture through ...

a) condensation b) absorbtion c) humidification

2. In a simple …, the refrigerant, in a volatile liquid form, is passed through a set of evaporator coils.

a) boiler b) heater c) air conditioner

3. In the meantime the vaporized refrigerant passes into … where it is pressurized and forced through condenser coils.

a) generator b) compressor c) evaporator coils

4. Alternate systems of cooling include the use of …

a) warm water b) distilled water c) chilled water

5. In the induction system, … is cooled once at a central plant and then conveyed to individual units

a) air b) water c) steam

12. Insert the appropriate words.

a) fins b) heat pump c) purity d) coils e) ducts f) refrigerant

1. Air–conditioning is the control of temperature, humidity, …, and motion of air in an enclosed space, independent of outside conditions.

2. The … evaporates and, in the process, absorbs the heat contained in the air.

3. The water runs down the … and drains.

4. Such a unit is known as a ….

5. Water may be cooled by refrigerant at a central location and run through … at other places.

6. More complex systems, as in tall buildings, use … to deliver cooled air.

13. Fill in the words listed below.

Assignment I

a) properties b) odors c) regulating d) circulation e) products f) particles g) humidity

Air conditioning

Air conditioning is the technique of – 1 – the condition of air in order to provide a comfortable environment for people or a favorable environment for making industrial – 2 –.

Air conditioning usually involves control of four physical properties of air: its temperature, its relative – 3 – its motion or – 4 – and the dust – 5 –in it. Some control of these four properties is important in air conditioning for human comfort. In certain industrial environments these – 6 – are even more precisely controlled, and there may be control of other properties, such as – 7 – and air pressure.

Assignment II

a) humid b) transportation c) conditioning d) product e) operation

f) temperature g) control

Applications of air conditioning

Air conditioning has many applications. Air – 1 –for the home is useful in regions where outdoor air – 2 –and moisture content vary widely or suddenly. Stores, restaurants, and theaters have found it necessary to have air–conditioned premises to attract customers on hot or – 3 –days. Air conditioned buses, trains, aircraft, and passenger cars are a feature of modern – 4 –.

Many industrial plants need close – 5 – of temperature and humidity conditions during manufacturing operations to provide a high–quality – 6 –. In addition, industrial air conditioning for the comfort of workers can thus provide more efficient – 7 –of the plant.

Summarizing

14. What parts of the text can you define? Name each part.

1. ________________ 4. ________________

2. ________________ 5. ________________

3. ________________ 6. ________________