An operating theatre is maintained at an inside temperature of 26°c dry-bulb when the outside air is at 40°c dry-bulb, 22°c wet-bulb and the sensible and latent heat gains in the operating theatre are 9 kw and 3 kw, respectively. a 100 per cent fresh air is handled, the air temperature leaving the cooling coil being 14°c and the apparatus dewpoint 12°c. assume a rise of 1.5°c across the supply fan (which is located after the cooling coil) and a further rise of 2°c because of heat gains to the supply duct. show the psychrometric processes on the psychrometric chart and determine (a) the shf (sensible heat factor) in the theatre (b) the wet bulb temperature of the supply air just after the cooling coil (c) the relative humidity of the air maintained in the theatre. (d) mass flow rate of supply air required (e) the cooling load of the cooling coil