Maintaining a certain DewPoint

[JasonB123]

What does it take to achieve and maintain a Dew Point temp of 40F at ambient temp ranges of 70F to 110F? We have a 10X10X8 insulated room we are using for a trial, we would like to maintain a dew point range of 40-50F, plant air around this room ranges from 70-110F this is uncontrolled. Within the room what is needed? Humidifier, or combination with air-conditioner? Your help is appreciated. -THANKS

 

[Drazen]

much depends on outdoor design temperature range, you would need say humidifier and dehumidifier, eventually reheat coil plus unavoidable cooling coil, eventually preheat coil as well.

internal loads have to be counted as well.

you need to determine whether is is seasonal demand or year-round. you need an engineer to make psychrometric calculations and size the equipment.

 

[willard3]

I'm with Drazen, hire an engineer who does this.

 

[BronYrAur]

I agree with the comments, but let me add that a good vapor barrier is probably the most important thing you need. You mentioned that the room will be insulated (which contains temperature), but you must also make sure that humidity (or lack there of) is contained.

You mentioned a dew point temp of 40-50F, but what space temp range is acceptable? You probably need a desiccant-type dehumidification unit (e.g. Munters), but you may need to add humidity as well. FYI, a desiccant-type unit will most likely require a post-cooling coil as the air from the unit will be too hot.