Task $1$

Heat transfer area inside the vapour generator is a bunch of steel pipes of diameters $\frac{32}{28}mm$ and length $2\mathrm{.}5m($steel heat conduction coefficient is $46,5\frac{W}{m\mathrm{.}2L})$ This apparatus warkigs in cross flow regime. From the generator is receiving $110k\frac{g}{m}in$ of ethand vapors, which is produced from the liauid at $28C$ which is heated to the boiling temper. $78C.$ Heating agent is a water steam that duning process is cooling down from $152C$ to $128C.$ Liquid e thanol specific heat is $2380Ux(k_{g}1).$ Heat tronsfer coefficient at the steam side is $12,500\frac{W}{m^2*}$

$u,$ and at the ethanol side is $3600(\frac{W}{m^2}*k).$ Calculate the amount of the heating agent and the necessany number of pipes