Question $5$

$($a$)$ A hot$-$deck$/$cold deck air conditioning system maintains two zones at $20Cdb,$ delivering $3\mathrm{.}2k\frac{g}{s}$ to each. The cold deck temperature is maintained by controlling a chilled water coil $($contact factor $0\mathrm{.}85)$ and the re$-$circulation dampers in sequence. The ratio of re$-$circulated and fresh air is $3$:$2.$ An enthalpy controller closes the re$-$circulation dampers to minimum $(40\%)$ fresh air when the outside air enthalpy exceeds the room enthalpy.

At an intermediate summer condition, when the outside air is at $23Cdb$ and $20Cwb,$ the cooling loads in the two zones are as follows:

$\backslash$table$[[,$Sensible $($kW$),$Latent $(kW)$