Problem $3-32$ An air$-$conditioned space has a sensible heat load of $200,000$ Btu$/$h$,$ a latent

load of $50,000Bt\frac{u}{h},$ and is maintained at $78FDB$ and $60\%rh.$ On a mass basis, $25\%$ outdoor

air is mixed with return air. Outdoor air is at $95FDB$ and $76FWB.$ Conditioned air leaves

the apparatus and enters the room at $60FDB.$ The fan must produce a pressure increase of

$3\mathrm{.}5$ in $.$ water to overcome the system pressure loss. Fan efficiency is estimated as $55\%.$

Draw and label the schematic flow diagram for the complete system. $($Hint: See

Figure $3-1.)$

Complete the table below.

Plot and draw all processes on a psychrometric chart.

Specify the fan size, scfm$,$ and fan motor rating, hp$.$

Determine the size refrigeration unit needed, in Btu$/$h and tons.

What percent of the required refrigeration is for $(1)$ sensible cooling and $(2)$ for dehu$-$

midification?

What percent of the required refrigeration is due to the outdoor air load?