4. Answer the questions to the text:

1) What is a heat exchanger?

2) What separates the fluids and prevents them from mixing?

3) Why are fins or corrugations sometimes used with the wall?

4) What can heat exchangers be used for?

5) In what industries have heat exchangers found their use?

6) What are three primary flow arrangements with heat exchangers?

7) How is a shell and tube heat exchanger designed?

8) How does a regenerative heat exchanger work?

5. Choose the correct continuation to complete the following statements:

1) The fluids may be separated and prevented from mixing

a) by a solid wall

b) by a specialized device

2) In the most efficient heat exchangers, the surface area of the wall between the fluids

a) is maximized

b) is minimized

3) Heat exchangers are often brought to use in

a) heating processes

b) industrial procedures

4) Some other important fields where heat exchangers are applied.

a) air conditioning and refrigeration systems

b) spacecrafts and airplanes

5) The fluids come in from the same end and move parallel to each other as they flow to the other side

a) in the parallel-flow heat exchanger

b) in the counter-flow heat exchanger

6) For jobs that would require high pressures

a) a shell and tube heat exchanger is usually used

b) a plate heat exchanger is usually used

6. Fill in the gaps with the suitable words from the box:

a) treatment b) heat c) arrangements d) refrigeration d) tube e) spacecrafts f) finned g) flow

1. fluid _____resistance

2. waste water _______industry

3. to recover lost _______energy

4. primary flow _______with heat exchangers

5. multiple ______tubes

6. shell and _______design

7. to be used widely in______ and airplanes

8. air conditioning and______ systems

7. Which of the following sentences from the text contain the Passive Voice forms? Explain how you define these forms.

1. A solid wall may separate the fluids.

2. Fins or corrugations are sometimes used with the wall

3. Heat exchangers have found their use in several industries.

4. The main use of heat exchangers is in industrial procedures.

5. In the counter-flow heat exchanger, the fluids enter the exchanger from opposite sides.

6. The set of tubes present in a shell and tube heat exchanger is called a tube bundle.

7. The tube bundle is comprised of several different tubes in all shapes and sizes.

8. A regular and timely examination of heat exchangers is essential.

6. Say if the following statements are true or false. If the statement is false explain why:

1) A heat exchanger is a specialized device that separate the fluids and prevent them from mixing.
2) Fins or corrugations are sometimes used with the wall in order to minimize the fluid flow resistance.
3) Heat exchangers are used to recover lost heat energy in industries
4) Because of transferring the greatest amount of heat cross-flow heat exchanger is the most efficient design.
5) The most typical type of heat exchanger is the shell and tube design.
6) The strength of the tubes that make up a shell and tube heat heat exchanger enables it to handle temperatures high.
7) Regenerative heat exchangers can be made with the shell and tube design or the plate design.
8) To prevent contamination and any impurities collected in a heat exchanger, a regular and timely blockage of heat exchangers is essential.

7. Imagine that you are a representative of the company that manufactures four different designs of heat exchangers: shell and tube, plate, regenerative and intermediate ones. At this moment you are at the engineering fair. There are some representatives of competitive companies designing the same types of heat exchangers. You have to exert every effort in order to persuade the potential customers of buying nothing but your manufactured articles. So think over a brief informative presentation.

8. Pick up the key words from the text “Heat exchangers”. Make up your own sentences with them.

9. Write an abstract to the text “Heat exchangers”.

10. Get ready for presenting the topic “Heat exchangers” at the conference ”Innovations in Science and Engineering” based on the following questions of Task 4.