Condensing film co$-$efficient for steam on horizontal tubes ranges from $5000$ to $15000$ Kcal$/$hr$.$m$2.$C$.$ Condensation of vapor is carried out inside the tube in a shell and tube heat exchanger, when the

Higher condensing film co$-$efficient is desired

Condensate is corrosive in nature

Lower pressure drop through the exchanger is desired

Temperature of the incoming vapor is very high