- •Міністерство аграрної політики україни
- •Table of Contents. (Зміст)
- •Plate Heat Exchanger. ( The main components).
- •1. Match the words from the left column with their translations in the right
- •2. Make up sentences with the key words.
- •3. Read the text and find the sentences with the key words in the text. Main components.
- •4. Discuss the questions.
- •Vocabulary.
- •A direct expansion evaporator.
- •1 Match the key words with their translations.
- •2. Write your ideas of what you would like to know about a direct expansion evaporator.
- •3. Read the text and say if you have found the answer. A direct expansion evaporator.
- •Vocabulary.
- •Flooded flow
- •Flooded flow.
- •6. Complete the sentences.
- •7. Discuss the questions
- •8. Complete the sentences with the correct form of the verbs in bra-
- •9. Translate these sentences into English.
- •Vocabulary.
- •The basic refrigeration cycle.
- •1. Match the words from the left column with their definitions in the right column.
- •2. Write your ideas of what you would like to know about the basic refrigeration cycle.
- •3. Read the text and say if you have found the answer. The basic refrigeration cycle.
- •4. Find the sentences with the key words in the text guess the meaning. Use a dictionary to check the answer.
- •5. Discuss the questions.
- •1. Read the text, find the sentences with the key words and guess the meaning. Use a dictionary to check the answer. The basic refrigeration cycle. Part 2
- •2. Read the text again. Answer these questions.
- •The expansion process and devices
- •In all types of the refrigeration cycle there is a step where liquid refrigerant is expanded from the condensing pressure to the evaporating pressure. Refrigerant evapo-
- •2. Read the text again and correct the mistakes. Begin your answer with:
- •3. Complete the sentences.
- •4. Give affirmative answers to the following questions according to the given model:
- •5. Complete the with the correct forms of the verbs given in brackets.
- •Vocabulary
- •1. Match the words from the left column with their definitions in the right colomn.
- •2. Write your ideas of what you would like to know about the pressure drop.
- •3. Read the text and say if you have found the answer. Methods to control the pressure drop
- •4. Find the key words in the text and guess the meaning. Use a dictionary to check the answer.
- •5. Discuss the question.
- •Vocabulary.
- •The compressor.
- •1. Match the words with their translation.
- •2. Read the text and answer the questions.
- •Evaporators, condensers and interchangers.
- •1. Match the Key words with their translation.
- •2. Use your knowledge and answer the questions.
- •3. Now read the text quickly and check your guesses. Evaporators, condensers and interchangers.
- •4. Read the text more carefully.
- •6. Make these sentences negative.
- •Vocabulary.
- •Literature.
- •Рецензія
1 Match the key words with their translations.
Повреждение, пар, термоэлектрический привод, смесь, испаритель непосредственного охлаждения, терморегулирующий, шаговый электродвигатель, перегретый, импульс- ный электродвигатель, гидравлический удар.
2. Write your ideas of what you would like to know about a direct expansion evaporator.
3. Read the text and say if you have found the answer. A direct expansion evaporator.
All the mixture enters the evaporator, the liquid part evaporates and a pure vapour leaves the evaporator and enters the compressor. To ensure that no liquid droplets the compressor, where they could cause liquid hammering and damage, the vapour has to be somewhat superheated. The superheat is also an excellent variable for control of the expansion valve.
Of special importance is the thermostatic expansion valve, which is controlled by the vapour superheat from the evaporator. This is of prime importance for the function of a direct expansion evaporator.
The electronic expansion valve is increasingly common. The advantages, flexible control parameters and remote control, make it is very popular in supermarkets with numerous air conditioning units and refrigeration duties at different temperature levels. The most reliable valves are equipped with a heat motor, but pulse modulated and step motors are also used.
4. Fill the gaps with the necessary words.
1 All the mixture___________ the evaporator.
2 A pure vapour ________ the evaporator and _______the compressor.
3 If liquid gets the compressor, it can cause_______________.
4 The______________is increasingly common.
5. Read the text again and answer the questions.
1 Where does all the mixture enter?
2 How does the refrigerant leave the evaporator?
3 What can a drop of liquid cause in compressor?
4 Why has the vapour to be superheated?
5 What is superheated also used for?
6 Why is the thermostatic valve of special importance?
7 What are the advantages of the electronic valve?
8 What are the most reliable valves equipped with?
6. Read and translate the text from ex.3.
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7. Write the questions to the sentence
1In a flooded evaporator the expansion of the refrigerant is seldom controlled by the superheat as in the direct expansion evaporator.
2 When the saturated mixture rises through the evaporator, the pressure decrease.
Vocabulary.
direct – прямой, непосредственный,
pure - чистый,
droplet – капать (здесь)
cause – являться причиной
liquid hammering- гидравлический удар
damage - повреждение
superheated - перегрев
the vapour has to be superheated - пар перегревают
thermostatic - терморегулирующий
mixture- смесь
advantage- преимущество
reliable- надежный
pulse modulated motor- импульсный электродвигатель
a step motor – шаговый электродвигатель
heat motor – термоэлектрический привод
to equip-оснащать
saturated- насыщенный
flooded- утопленный
pressure- давление
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