Chamber 1 and 2
Chambers 1 and 2 were constructed in 1988. These twin stainless steel chambers were primarily designed for air quality experiments. They can provide a range of temperatures up to 40°C and relative humidity from 10-90%. A particularly high exchange rate can be adjusted, up to 70 ACH by displacement ventilation. The stainless steel material minimizes sorption processes by indoor surfaces. Chambers 1 and 2 are connected with a door for easy access in comparative studies. The size of both is 9 m2 floor area times 2.5 meters height.
Chamber 3
This chamber is the oldest climate chamber at the Centre and was built in 1972 for thermal comfort experiments. The floor area is 28 m2 and the height 2.5 m (volume 70 m3). Up to 3500 m3/h of supply air can be provided, which means and air change rate of 50 ACH. The conditioned air is supplied uniformly from the floor to the ceiling and also passes through the thin textile layers of the walls to control air temperature and radiant temperature. In this way the chamber has a low thermal mass so that the temperature can be changed rapidly. The temperature and humidity range as in the other chambers.
Chambers 4, 5 and 6
These are the new chambers inaugurated in 2001. Chambers 4 and 5 are multipurpose chambers with the possibility of mixing or displacement ventilation. The size of all three chambers is 23 m2 x 2.5 meters (57 m3 in volume) with possible air flow rate up to 610 m3/h (11 ACH). The temperature can range between 10-40°C and the relative humidity between 10-90%. Chamber 6 is an air quality chamber with an available airflow rate double compared to the other two chambers. It is designed with displacement ventilation only. The chambers appear like normal offices and are suited for long term exposures. External pollution chambers can be connected in the ventilation system upstream, which enables to run double blind experiments, having the source of pollution hidden within the ventilation system.
Chamber 7
Chamber 7 located inside the so called Tall Hall, is designed for testing different air distribution principles. The chamber has a modular structure of 1.2 m. Its maximum size is 7.2 x 4.8 x 6.0 meters (35 m2 floor area, 208 m3 volume). One of the walls is single glazed up to a height of 2.4 m. The ceiling is made of 0.6 x 0.6 m2 gypsum tiles and is divided into 3 parts, which can be adjusted to different heights, each part separately or as a whole. The chamber size can be modified with a floor-to-ceiling partition, which splits the chamber into two sections. The tall hall is ventilated by mixing ventilation, while mixing or displacement ventilation can be applied to the chamber.
Field Laboratories
The three field laboratories present a flexible room set-up which can be used as one large room or divided with partitions into three separate and fully independent rooms with no leakage between. Each room has a floor area of 18 m2 and a volume of 55 m3 and can be supplied with 
a maximum of 110 L/s of outdoor air (7 ACH). Each of the rooms has an independently regulated ventilation system and temperature control. Humidifiers can be additionally installed in each room.
The separate rooms are suitable for testing simulated office environment or can be used for full scale sensory assessments of pollution sources. The so called “pollution box” in each room provides space for placing sources of pollution invisible for subjects. Fans on the top of the box draw air through the source and insure mixing of the polluted air in the room.
PV Field Laboratory
The PV field lab with size 36 m2 x 3.0 m (108 m3) is specially designed for studies on personalized ventilation under conditions as close as possible to reality. The lab is equipped with two different ventilation systems, a “total volume system” for generating different background environment in the room and “personalized ventilation system”. The two systems have separate control.
The “total volume system” can generate either mixing or displacement air distribution in the lab. The supply flow rate can be controlled to achieve ACH up to 7.5 h-1 and room air temperature in the range 20-28°C. The system can be operated under different modes: from only recirculation of the ventilation air to 100% outdoor air.
The PV system supplies in total 180 L/s outdoor air to six workplaces with personalized ventilation, i.e. 30 L/s per workplace. Individual control is provided at each workplace: flow rate can be controlled in the range 0-30 L/s, supply air temperature in the range 18-28°C, and relative humidity of the supply air in the range 30-70%. The control can be delegated to the user at each workplace or can be executed from the machine room.
The PV lab has been used for human subject experiments as well as physical measurements. Studies on performance of PV systems with regard to generating optimal microenvironment, mainly thermal comfort and air quality; control strategies, airborne transmission of infectious agents has been performed.
Classroom
Another room that can be considered as a field lab is the newly built classroom. The room is designed for research, education and demonstration of different ventilation and air-conditioning systems. A number of ventilation systems are integrated in the room, e.g. mixing, displacement, natural, hybrid and personalized ventilation systems. The temperature of both ceiling and floor is adjustable (both heating and cooling). The advanced control system makes it possible to combine different ventilation and heating/cooling system to establish any required indoor air environment. The system has the flexibility to integrate many kinds of air processing equipments for testing their performance. The classroom can also be used as a field lab to study the effect of different ventilation principle in a real space that has high population density.
All equipments of the system are sponsored by the world leading companies in the field. These include: Systemair, TAC, Danfoss, Carrier, Trox, Lindab, Uponor, Delta, Exhausto, Grundfos and Window Master.
