$4\mathrm{.}13$ A room has a net ousside wall area of $275A{t}^2$ with a sur$-$

face temperature of $54F,45f^2$ of glass with a surface tempera$-$

ture of $20J^2,540f{t}^3$ of ceiling with a surface temperature of

$60F,670f^2$ of partitions with a surface temperature of $70F,$

and $540f^2$ of floor with a surface temperature of $70F.$ If the air

movement is $20$ fpm and light clothing is being wom, deter$-$

mine the air temperature necessary for comfort.