Four $2-$m$-$long double pipe heat exchangers made of $4-$std type M and $3-$std type M copper tubing are connected together in series to form one $8-m-$long exchanger. It is used to cool $($unused$)$ engine oil. The exchanger takes in water at $20C$ at a flow rate of $30k\frac{g}{s}$ and oil at a temperature of $140C$ with a flow rate of $0\mathrm{.}2k\frac{g}{s}.$ Determine the expected outlet temperature of the oil and the pressure drop encountered by both streams. Assume counterflow.

Summary of Performance of Heat Exchanger $($Counterflow$)$

Spreadsheet follows.

$\backslash$table$[[T_1=140C($oil$),t_1=20C($water$)],[p=0\mathrm{.}2Pa($oil$),p=1\mathrm{.}5$kPa $($water$)],[R_d=0\mathrm{.}0015($oil$),R_d=0\mathrm{.}001($water$)],[$New$,$After $1$ year$],[U_0=7\mathrm{.}86\frac{W}{m^2*(K)},U=7\mathrm{.}71\frac{W}{m^2*(K)}$