slot diffusers mounted in between the cooled ceiling panels.
Fig. 5 presents a cross-section of the test chamber and
Fig. 6 shows the floor plan and a reflected ceiling plan.
The positions of the supply air devices are stated.
The cooled ceiling investigated was a hydronic panel
type and covered about 90% of the entire ceiling area. The
portion for heat exchange via radiation was about 45%.
The exhaust air was leaving the room through slots between
the ceiling panels.
In real buildings, it is not always possible to cover the
entire ceiling with cooling panels or cold water pipes
embedded in plaster., as other installations, e.g., lights or
construction components, take up some space. In order to
be able to investigate the impact of a partly-cooled ceiling
on the airflow pattern, the air quality and thermal comfort,
the total area of the cooled ceiling was divided into two
equally sized parts with individual cold water cycles. Due
to this, the cold water flow through each of these cooling
areas could be controlled individually and either the entire
cooled ceiling or just one half of it was cooled.
Additionally, the heat sources in the test chamber were
arranged in three different configurations, so that several
Fig.