Dehumidifying equipment is work depends upon a:- a - Heat coil over which air. b- Warm coil over which air. c- Cold coil over which air.?

very cold coil the air temp. goes to16c then a heater to get  the temp. up back to22c  (human comfort) 

Air dehumidification can be achieved by two methods:

1-cooling the air below its dew point and removing moisture by condensation 

2- sorption by a desiccant material. Desiccants have a natural affinity for removing moisture. As the desiccant removes the moisture from the air, it releases heat and warms the air, i.e., latent heat becomes sensible heat.

c- Cold coil over which air