Problem $2$

In a cooling tower, water enters a packed tower from top at $50C$ and should leave at $20C$ by contacting with air flowing counter$-$currently at inlet temperature of $20C$ and humidity of $20\%.$ The liquid flows at the rate of $0\mathrm{.}275k\frac{g}{m^2}s$ and the air at $0\mathrm{.}837k\frac{g}{m^2}s.$

Given that: the latent heat of water at $0C$ is $2495kJkg,$

specific heat capacity of dry air is $1\mathrm{.}003kJkg.,$

specific heat capacity of water vapor is $2\mathrm{.}006kJkg.C$

the height of transfer unit $($HTU$)$ is $3\mathrm{.}485$

provide values of any necessary information from your knowledge without asking

G

Calculate the mass flowrate of dry air per unit area.

Estimate the humid heat and enthalpy of the inlet air stream.

Estimate the enthalpy of the equilibrium air$-$vapor system for the following temperature values: $20,26,32,38,44,$ and $50C.$

Estimate the two end$-$point of the operating line. Find the values of gas enthalpies corresponding to the temperature values in question $3.$

Tabulate the values needed for estimation of number of transfer units $($NTU$)$ without performing integration.