A chilled water air washer is a complex system especially if it is for a textile mill.So a person with no experience should not attempt its design in my opinion.Leave it to someone who has done it before.
I worked with several MEP contractors in North Carolina that have (had) extensive experience with Air Washers. With the loss of our textile industry experts with air washers are going to be fewer and harder to find.
In North Carolina I worked with AC Corp, Environmental Air Systems, and LUWA Bahson. All these are very large MEP contractors with engineers on staff. Any of the three of these could be found on the net and called.
Air washers are generally broken into two designs (wet and dry sump). With chilled water used for de-humidification you'll probably use the dry sump (drains back to a central pump to handle the added water from de-humidification).
I was fortunate enough to work for the man that wrote the carrier Load estimation book and he brought an absolute wealth of knowledge (including air washers). Be happy to provide contact information for engineers or contractors that I worked with in the past.