Abstract
This chapter discusses the air-cooled exchangers with the airside pressure drop. This device is used to approximate the required fan horsepower. It also discusses the vacuum condensers. Their outlet temperature and pressure is controlled by having proper subcooling in the vent end of the unit so as to prevent the large amounts of process vapors from going to the vacuum system along with the inerts. Baffling is designed to keep the pressure drop as low as possible. The higher the pressure drop, the higher the energy consumption, and the harder the job of attaining proper vent end sub-cooling. The pressure drop is lower at the outlet end because of the smaller mass flow. Fog can form in the device posing various problems as it can go through the packed columns and mist eliminators. It occurs in the condenser when the mass transfer does not keep up with the heat transfer. Thus, the device design must provide sufficient time for the mass transfer to occur.
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