New York Associate Public Health Sanitarian Practice Test

What is the function of heat exchange coils in air pollution control?

Adds moisture to the air Cools air before control equipment Heats air after treatment Filters out particles

Correct Answer:

Cools air before control equipment

Explanation:

Heat exchange coils are used to cool hot exhaust gas before it enters downstream pollution-control equipment. By bringing the gas down to a more moderate temperature, these coils protect sensitive equipment from heat damage, improve the efficiency of the control process (since many devices work best at cooler, stable temperatures), and can help condense moisture or pollutants to aid removal. This purpose is distinct from adding moisture, heating after treatment, or simply filtering particles, which are not functions of the cooling coils. So cooling the air before control equipment is the key role.

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