Construction of the new UNC dual Aerosol chamber Constructed in 2002 and took about 1 year to complete The dual chamber is Quonset hut in design, width.

Construction of the new UNC dual Aerosol chamber

• Constructed in 2002 and took about 1 year to complete

• The dual chamber is Quonset hut in design, width = 8.53 m

length = 9.75 m

height = 3.89 m

The total chamber volume is ~270m3

• The walls of the chamber are made of 5 mil FEP Teflon film and are attached on 1.22 m centers to 4.81 cm o.d. round tubular metal frames that form the superstructure of the chamber.

• A suspended 5 mil FEP Teflon film (type C) curtain, (Livingstone Plastics, Charlotte, NC) bisects the chamber to form two chamber halves.

Building a platform

Building the frame

• The small superstructure frame creates very little shadowing of the sunlight entering the chamber and also provides a very durable structure.

Orientation to the sun is very important

Frame attachment to platform

Sealing the joints

Bracing

Floor

Intake ducts

Mixing Fans

13

Entry door

Exhaust port

Attaching Film

Attaching Film

Finished

Three UNC chambers

Injection of liquids

Sampling directly under chamber

GAS phase NO-O3 titration

Auto sampling GCs for VOC analysis