• # question_answer A cooling coil with a by-pass factor of 0.1 and apparatus dew point (adp) of $12{}^\circ C$ comes in contact with air having a dry-bulb temperature of $38{}^\circ C$ and dew point of $9{}^\circ C.$ Over the cooling coil, the air would undergo: A) Sensible coolingB) Cooling and humidificationC) Cooling and dehumidificationD) Adiabatic saturation

$BPF\,\,=\,\,0.1,\,$ $ADP\,\,=\,\,12{}^\circ C,$ $DBT\,\,=\,\,38{}^\circ C,$$DPT\,\,=\,\,90{}^\circ C,$  BPF for cooling coil $=\frac{{{t}_{d\,2}}-{{t}_{d\,3}}}{{{t}_{d\,1}}-{{t}_{d\,3}}}$          $1=\frac{{{t}_{d\,2}}-12}{38-12}$                         ${{t}_{d\,2}}=2.6+12=14.6{}^\circ C>{{t}_{d\,1}}$ Dehumidification rakes place.