2014-02-17
376
Exercise 2. Read and translate the text.
TEXT 3
Exercise 11. Discuss with your groupmates the types of the refrigerant used at the modern processing plant.
Exercise 9. Find in the text and write down the sentences with Passive Voice, analyze the tense in each sentence.
Exercise 10. Answer the following questions:
1. What did the scientific magazine "Nature" report?
2. What did this discovery lead to?
3. What was the first step to improve the situation?
4. What are the alternatives?
5. What must the refrigerants be absolutely free from?
6. What are disadvantages of the refrigerants of the HFC group?
7. Why will the use of the mixtures require higher technical skill?
8. What are the disadvantages of carbon based refrigerants?
9. What is a traditional refrigerant?
10. What are its disadvantages?
Exercise 1. Read and memorize the words from the text below:
| avoid, v | избегать, остерегаться |
| stick, v | липнуть, прилипать |
| eliminate, v | устранять, исключать |
| mesh, n | ячейка сети; отверстие |
| utilize, v | использовать |
| adherence, n | прилипание; слипание; сцепление |
| stiff, adj | жёсткий, тугой, негибкий, неэластичный |
| retention, n | удерживание, сохранение |
| spray, v | брызгать, распылять; обрызгивать, опрыскивать |
| load, v | грузить, нагружать |
| valve, n | клапан; вентиль |
| mount, v | монтировать, устанавливать |
By pre-freezing the bottom surface of wet and sticky food products efficiently before they enter the final freezer, the most common problems associated with today's freezing lines can be avoided.
|
|
|
According to AGA, the producing company, its new pre-freezer eliminates problems like belt mesh marks onthe products, sticking and bending and, thereby financial losses. The new AGA freezer is reported to be well suited for food products such as fish fillets.
The freezer utilizes a super cold stainless steel belt, on which the fish products are loaded. Heat from the bottom surface is very quickly transferred to the belt and the underside freezes instantly. The food portions do not stick to the belt, because the rapid freezing process simultaneously shrinks the surface. Losses due to adherence to the bell are thereby eliminated. The steel belt provides the food products with a smooth bottom surface free from mesh marks.
In the final spiral freezer, the stiff bottom surface prevents bending. The degree of freezing required for variable-sized food products is controlled by varying the retention time in the freezer.
The patented freezing technique demands a direct contact between the low temperature metal surface and the product. The freezer uses a bath of liquid nitrogen through which the metal conveyor rotates, in addition, nitrogen is sprayed directly onto the bottom side of the conveyor belt immediately before it reaches the load zone. The control system includes a temperature controller operating valve for the nitrogen supply.
According to the manufacturer AGA, special attention has been paid to easy use of the freezer. The side-mounted control panel features clearly defined, easy-to-use switches, an automatic gas-supply controller and a temperature indicator. There is no need for manual control by the operator during the production process. The freezer can easily be opened for cleaning.
Exercise 3. Complete the sentences using information from the text:
1. The new AGA freezer is reported to be…
2. According to the manufacturer…
3. The food portions do not stick to the belt, because…
4. The patented freezing technique demands…
5. The freezer utilizes…
6. The freezer uses a bath of liquid nitrogen through which…
7. The degree of freezing required for variable-sized food products is controlled by…
Exercise 4. Say if the sentences are true or false:
1. There is no need for manual control by the operator during the production process.
2. The control system includes a load controller operating valve for the nitrogen supply.
3. The steel bed of rods provides the food products with a smooth bottom surface free from mesh marks.
4. Special attention has been paid to easy use of the freezer.
5. The freezer can hardly be opened for cleaning.
Exercise 5. Answer the following questions:
1. What are the most common problems associated with today's freezing lines?
2. How can they be avoided?
3. What problems does new pre-freezer eliminate?
4. What does this freezer utilize?
5. What does the patented freezing technique demand?
6. What refrigerant does the freezer use?
7. What has special attention been paid to?
