$($a$)$ The data in TABLE $1$ below relates to a specific heat exchanger. A reliable colleague has looked up an effectiveness chart and says that the effectiveness in the given operating conditions is $0\mathrm{.}82.$

Data:

$\backslash$table$[[,$'Hot' fluid,'Cold' fluid$],[\backslash$table$[[$Mass flowrate$],[kg{s}^{-1}$