different arrangements of cooling load 7 movable heat
sources. and cooled ceiling area could be investigated.
Table 1 shortly presents the variations investigated. Heated
manikins and ‘boxes’ simulating computers or printers.
were used as heat sources. The movable heat sources
released about 75% of the entire cooling load. The rest was
being released by the lighting ;17%. and the measure-
ment equipment ;8%..
Five out of seven heated manikins movable. were used
as tracer gas sources, releasing the tracer gas from below
their clothes at a height of about 1 m. The tracer gas
concentration and the air temperature was measured at six
locations three axes; see Fig. 6. and different heights. The
tracer gas concentration was determined by an infrared gas
detector accuracy ;3%. and the temperatures were mea-
sured with thermocouples NiCr–Ni; accuracy of the entire
set-up: ;0.1 K.. The analog measurement signals were
digitalized by a data-logger and then controlled online,
analyzed, recorded and stored with a PC.
The portion of cooling load removed by the ventilation
system v and the cooled ceiling v are calculated supply ceiling
according to the following equations: