Different roles: first of all, the condenser and evaporator are attributed to the heat exchange equipment, but the condenser is an exothermic component, the evaporator is a heat-absorbing component, the two are refrigeration equipment must not be less parts.
Different forms of work: the condenser is to give the medium cooling liquefaction, external exothermic; evaporator is the medium of heat absorption gasification, absorption of external heat, that is, the refrigerant is from the gas state to the liquid state, is a condensation exothermic process, the pressure is generally very high; and the evaporator of the refrigerant is from the liquid state to the gas state, is an evaporation of the heat absorption process, and the pressure is generally lower.
Differences in appearance: the evaporator shell process for the water, tube process for the refrigerant; condenser just the opposite. There is little difference in appearance, but the evaporator tube box material is generally better than the condenser.