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  1. Fluids absorb heat while changing from a liquid state to a vapor state. Fluids give up heat in changing from a vapor to a liquid (Function of Expansion Valve)
  2. The temperature at which a change of state occurs is constant during the change, provided the pressure remains constant. (Heat Exchanger)
  3. Heat flows only from a body which is at a higher temperature to a body which is at a lower temperature (hot to cold). (Evaporator)

Jaya Prakash, Ex-PO ME, Indian Navy

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13y ago

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