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4. Air conditioning

This is the best system of artificial ventilation in which provision is made for filtration, healing or cooling, humidifying or dehumidifying etc, thus creating most comfortable working condition.

Air conditioning

Air-conditioning may be defined as the process of treating air so as to control simultaneously its temperature, humidity, purity and distribution to meet the requirements of the conditioned space. The various requirements of a conditioned space may be comfort and health of human beings, needs of certain industrial processes, efficient working of commercial premises etc.

Air-conditioning is resorted to for the following normal

(i) It helps in preserving or maintaining health, comfort and convenience of occupants of residential building.

(ii) It helps in improving the quality of products in certain industrial processes such as artificial silk, cotton cloth, etc. In other cases of industries, it provides comfortable working conditions for the workers, resulting in the increase of the production.

(iii) It helps in marking the commercial premises, such as shops banks, offices, restaurants etc., more active and efficient.

(iv) It provides more comfortable entertainment in theatres etc.

(v) In the case of air conditioned railway/roadways coaches, or air travel, journey becomes more comfortable.

General understanding:

I 1. What do you understand by (a) air conditioning

(b) ventilation

Explain necessity of each.

2. Discuss in brief the functional requirements of ventilation system.

3. Describe in brief (a) wind effect (b) stack effect. Write down the expression for rate of air

flow in each case.

4. Write down general rules for natural ventilation.

5. Explain in brief various system of mechanical ventilation.

6. Differentiate between comfort air conditioning and industrial air conditioning. Explain

various controls required for comfort air conditioning.

II Practice reading the following words and word combinations Learn them by heart.

1. Extraction system.

2. Air conditioning.

3. Effective air calculation.

4. Vitiated air.

5. Results in cooling air.

III Using the material of the above text, make your dialogue.

IV Make as many sentences as you can, using the following words.

Air change -воздухообмен

Air change rate -норма воздухообмена

Dry air -сухой воздух

Outside air, outdoor air -наружный воздух

Supply air -подаваемый воздух

Treated air -обработанный воздух

Air cleaner -воздухоочиститель

Air-cooled air conditioner -кондиционер с воздушным охлаждением