Recently I joined a discussion about safety considerations for external fire scenario. When calculating the wetted surface for protecting the tube side of an heat exchanger it was discussed whether to include the shell surface and the heads or whether to include just the head surfaces. There...
Fouling factors are used to provide added heat transfer surface area. This means that the exchanger is oversized for clean operation and barely adequate for conditions just before it should be cleaned. TEMA and other sources provide values for fouling resistances "so that the exchanger will meet...
