- •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
Flooded flow
1 Key words
Flooded flow, vessel,, to settle, gravity, centrifugal, recirculated liquid, natural, forced circulation, separator- evaporator, expansion valve, loop.
2. Match the translation with the key words.
Сила тяжести, принудительная циркуляция, регулирующий вентиль, испаритель, работающий только на жидкой фазе хладагента, сосуд, самотеком(здесь), оседать(здесь), отделитель-испаритель, центробежный, контур/ виток, жидкость из отделителя.
3. Make up sentences with the key words from ex.1.
4. Write your ideas of what you would like to know about the flooded flow.
5. Read the text and say if you have found the answer.
Flooded flow.
The vapour and liquid are separated, usually in a vessel large enough for the liquid droplets to settle by gravity or, sometimes, by centrifugal force.
The liquid together with recirculated liquid enters the evaporator, partly evaporates. The emerging vapour-liquid mixture re-enters the separator, where the vapour and liquid separate.
The circulation can either be natural – thermosiphon – or by a pump-forced circulation.
The vapour joins the expansion vapour and leaves for the compressor. The liquid mixes withthe expansion liquid and re-enters the evaporator.
The vapour from the evaporator is neither dry nor superheated. Thus, there is no superheat to be used as a control variable. The expansion is controlled by the level of liquid in the separator, instead. If the level decreases, the expansion valve opens and more refrigerant enters the separator-evaporator loop.
6. Complete the sentences.
The vapour and liquid are…….
The emerging vapour- liquid mixture……..
7
The liquid…….
The vapour from the evaporator is……..
The expansion is…….
If the level ……
7. Discuss the questions
1 Where are the vapour and liquid separated?
2 Why are the vessels large enough?
3 What happens to the liquid and recirculated liquid enters the evaporator?
4 Where do vapour and liquid separate?
5 What kind of circulation do you know?
6 What does mixture of vapour and the expansion vapour leave for?
7 Why there is no superheat to be used?
8 What is the expansion controlled by?
9 What happens if the level decreases?
8. Complete the sentences with the correct form of the verbs in bra-
ckets.
1 The liquid usually ( mix)____________with the expansion liquid and (re-enter) the evaporator.
2 The liquid (mix)____________________with the expansion liquid and (re-enter) ________the evaporator now.
3 The liquid (mix)_________________with the expansion liquid and (re-enter) the evaporator ten minutes ago.
4 The liquid _____just (mix)________with the expansion liquid.
9. Translate these sentences into English.
1 Выходящая из испарителя смесь жидкости и пара снова поступает в отделитель, где происходит разделение жидкости и пара.
2 Циркуляция жидкости может происходить либо самотеком – термосифон, либо с помoщью насоса – принудительная циркуляция.
3 Вместо этого процесс расширения управляется по уровню жидкости в отделителе.