Heat exchangers including condenser and evaporator are important equipments in the compression type refrigeration and air conditioning units

and their heat transfer coefficients have a direct effect on the efficiency and cost of the units. The application of the heat transfer enhancement technology is a key route to improve the heat transfer performance of the condenser and evaporator. For the condensation heat transfer enhancement on the tube outside of condenser

the fractured fins of Turbo-C can be separated from the tips to the roots to reduce the effect of the viscous property of condensate on the heat transfer performance at the presence of surface tension. The replacement of the segmental baffles with the helical baffles can improve the flow characteristics and heat transfer performance of the condenser and dry evaporator. Considering the different heat transfer characteristics between the falling film regions and the flooded evaporation regions in the falling film evaporator

different types of enhanced tubes should be used to improve the heat transfer performance of the evaporator.