- •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
2. Use your knowledge and answer the questions.
1. How many fluids are there in this plate heat exchanger?
2. How many types of plate heat exchangers are used in refrigeration?
What are they?
3. What are the main differences in?
4. What materials are used for different heat exchangers?
5. Which one is better for operation and maintenance? Why?
3. Now read the text quickly and check your guesses. Evaporators, condensers and interchangers.
This text deals exclusively with plate heat exchangers and especially brazed plate heat exchangers, where one fluid is a one or two-phase refrigerant and the other is a liquid for cooling or heating or a refrigerant.
The three heat exchanger types used in refrigeration, brazed, welded and semiwelded, have similar thermal and hydraulic properties.
The differences are mainly in the corrosive properties of the materials, different qualities of stainless steel, titanium and rubber for the SWPHE, stainless steel or titanium for the AWPHE and stainless steel and copper or nickel for the BPHE. Moreover, a SWPHE can be opened for inspection and cleaning while this is not possible for AWPHE and BPHE.
4. Read the text more carefully.
Are these statements true (T) or false(F)?
1. The three heat exchangers-brazed, welded and semiwelded have different thermal and hydraulic properties.
2. The differences are mainly in the thickness and colour of the materials.
3. A SWPHE and AWPHE can be opened for inspection and cleaning.
19
5.Translate these sentences into English.
1.В паяных пластинчатых теплообменниках одна среда представляет собой одно- или двухфазный хладагент, а другая среда - это охлаждаемая или нагреваемая жидкость или хладагент.
2.ПСПТО доступны для осмотра и очистки, что невозможно для СПТО и ППТ.
3.Пластинчатые теплообменники отличаются, главным образом, коррозийными свойствами материалов.
6. Make these sentences negative.
1. The liquid part has to evaporate in the evaporator, where it supplies the cooling effect.
2.The liquid has reached the final pressure.
3.However the compression was ideal.
20
Vocabulary.
a step motor – шаговый электродвигатель
acceleration energy –
advantage – преимущество
balanced – согласованый
Brazed plate heat exchanger (BPAE) – паянный пластинчатый теплообменник
capacity – ёмкость, вместимость
capillary tube – капилярная трубка
cause – являться причиной
centrifugal – центробежный
clog – задерживать
compared to… – по сравнению с…
compress – сжимать
compressor – компрессор
condenser – конденсатор
content – содержание
copper – медь
corrosion – коррозия
cross section –
damage – повреждение
decelerate – замедлять
decrease – уменьшаться
device – устройство
diameter – диаметр
direct – прямой, непосредственный
direct expansion evaporator – испаритель непосредственного охлаждения
droplet – капля
emerge – выходить
emerging – выходящий
equip – оснащать
evaporator – испаритель
exist – существовать
expansion – расширение
expansion valve – регулирующий вентиль
flooded - утопленный
flooded flow – утопленный поток
flow – поток
fluid – среда
forced circulation – принудительная циркуляция
function – функция
gravity – сила тяжести
heat motor – термоелектрический привод
hydraulic – гидравлический
instead - вместо
isentalpic –
join – соединять
knocking – стук
leave – покидать
length – длинна
level – уровень
21
liquid – жидкость
liquid hammering – удар жидкости
loop – контур/ виток
mixture – смесь
multitude – множество
natural – самотёком
oil – масло
orifice – отверстие
partly – частично
pipe liquid – трубная жидкость
piston – поршень
pressure – давление
pressure drop – снижение давления
process fluid –
pulse modulated motor – импульсный электродвигатель
pure – чистый
recipient – получатель
recirculated liquid – жидкость из отделителя
recover – возвращать
re-enter – возвращаться
refrigerant – хладагент
refrigeration plant –
reliable – надёжный
roughness – шероховатость
rubber – резина
saturation curve –
screw – винт
scroll – спираль
Semiwelded plate heat exchanger (SWPHE) – полусварной пластинчатый теплообменник
separate – отделять
separator-evaporator – отделитель-испаритель
stainless – нержавеющий
superheated – перегретый
the vapour has to be superheated – пар перегревают
thermal – тепловой
thermostatic – терморегулирующий
to settle – оседать
valve – вентиль
velocity – быстрота
vessel – сосуд (для жидкости)
wear and tear –
Welded plate heat exchanger (AWPHE) – сварной пластинчатый теплообменник
wound – свёрнутый
22