Heat transfer at the inside coil

Air Conditioning and Heat Pumps · The Basics · printed page 210 (PDF page 211)

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Heat Transfer at the Inside Coil Heat Transfer – at the Inside Coil – Air Conditioning Air Conditioning – Basics

Text in the illustration

r r r r
refrigerant flow
warmer
direction
warm air
cooled air
cold
aluminum fins
in the coil, heat is transferred through aluminum fins attached to copper tubing that carries the refrigerant
the fins are close together for maximum efficiency but this also makes it easy to clog the coil with dust and dirt
if we put cold refrigerant into the coil it will attract heat from the air passing around the fins

Generated explanation

The illustration shows heat transfer at an air-conditioning indoor coil, with warm air entering and cooled air leaving. Cold refrigerant enters the lower connection and exits warmer through the upper connection, as indicated by flow arrows. An enlarged detail shows closely spaced aluminum fins attached to copper tubing carrying the refrigerant. Heat passes from the air through the fins to the refrigerant. An annotation explains that the close fin spacing improves efficiency but makes the coil susceptible to clogging with dust and dirt; no actual clogging is depicted.