Question

For 'Infiltration' and ‘Ventilation' terms in air-conditioning, which is a false statement? 

1. Both are putting cooling / heating load on plant
2. Ventilation is deliberately provided, however infiltration occurs in an unwanted way
3. Ventilation can be made zero
4. Infiltration air quantity reduces ventilation air quantity

Answer 1

Correct Answer - Option 3 : Ventilation can be made zero

Explanation:

Infiltration

• It is the uncontrolled flow of air into space through unintentional gaps and cracks in the building envelope.
• The corresponding loss of air from enclosed space is termed as exfiltration.
• The rate of infiltration is dependent on the porosity of the building shell and the magnitude of the natural driving forces of wind and temperature.
• Air infiltration not only adds to the quantity of air entering the building but may also distort the intended airflow pattern to the detriment of overall indoor air quality and comfort.
• The magnitude of air infiltration can be considerable, It is frequently ignored by the designer.
• The consequences of air filtration are inferior performance, excessive energy consumption, excessive load on heating and cooling plant.

Ventilation

• It is the process by which clean air (normally outdoor air) is intentionally provided to space and stale air is removed.
• Ventilation is needed to provide oxygen for metabolism and dilute metabolic pollutants (Carbon dioxide and odor).
• It is used to assist in maintaining good indoor air quality by diluting and removing other pollutants within space.
• Good ventilation is a major contributor to the health and comfort of building occupants.
• Ventilation also increases cooling and heating load on the plant.
• Ventilation can't be made zero.