In an indirect expansion system, the product to be cooled _______

  1. Comes in direct contact with the refrigerant flowing inside the evaporator and mixes with it
  2. Is outside the surface of the evaporator and cooled by transfer of heat to the refrigerant flowing inside the evaporator
  3. Is cooled by a secondary refrigerant which is cooled by the refrigerant flowing inside the evaporator
  4. None of these

Answer (Detailed Solution Below)

Option 3 : Is cooled by a secondary refrigerant which is cooled by the refrigerant flowing inside the evaporator
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Direct Expansion (DX) system: In this system, the air from the space to be air conditioned is circulated over the cooling coil.

Indirect Expansion system: In this system, secondary refrigerant chilled water or brine from the refrigerator is circulated through the cooling coil located in the air handling unit.
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