Displacement air conditioning is one of the air conditioning systems in a building
that has been applied in industrial buildings by the Scandinavian countries since
1978. Displacement AC has good air quality room (compared with conventional
AC) so as to provide greater comfort for the user. In addition to the advantages,
displacement air conditioning has disadvantages which can cause draft cooling
effect (for those who are close to the supply diffuser) and the creation of the
vertical temperature gradient.The purpose of this research is to know the system
and design of the portable prototype diffuser displacement AC that can prevent a
draft effect of temperature gradient and spaces, as well as to find out the amount
of variety in the size of the diffuser needs spaces (3m x 3m x 4 m and multiply to
28m x 28m x 4 m) as well as the pattern of position. The methods used in this
research is simulationusing CFD ACE + programs.The results obtained were in
the middle of the room diffuser does not need to wear the steering wind speeds
will increase because of wind gusts. For the size space with wide span over 25 m
then the more optimal if grid pattern with a diffuser put spreads, whereas the
space with wide span 21 m under the pattern of laying the grid spreads as well as
centralized has no significant influence of cooling space.