Water Damage Restoration Technician (WRT) Certification Practice Test

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What process do refrigerant dehumidifiers use to remove water from the air?

Absorption
Evaporation
Condensation
Filtration

The correct answer is: Condensation

Refrigerant dehumidifiers operate through the process of condensation to remove moisture from the air. In this method, warm, humid air is drawn into the dehumidifier and passed over cold evaporator coils. When the warm air makes contact with the cold coils, its temperature drops, causing the moisture in the air to condense into water droplets. This condensed water collects in a reservoir or is drained away, effectively reducing the humidity level in the air. This process is distinct from absorption, where materials like silica gel would take in moisture directly from the air rather than causing it to condense. Evaporation refers to the process of liquid changing to vapor, which also does not contribute to removing moisture from the air. Filtration typically involves removing particles from the air rather than lowering humidity levels. Thus, the condensation process is specifically what allows refrigerant dehumidifiers to decrease the moisture content in the environment effectively.