design thermal displacement ventilation, we need to quantify several key
parameters. Among these, thermal displacement cooling load, supply air flow
rate, supply air temperature, temperature gradient, temperature at knee and
at head level, exhaust temperature. It is then a first and most important
step to quantify cooling load. And then we need a tool (model) to predict
several suggestions to approximate the cooling load in displacement
ventilation but none of them are very promising. As for the reason why it is difficult,
ASHRAE Research Project -RP-949 (pp.15 and 65) and Review of Design
Procedures for Displacement Ventilation System (pp.5,6).
We will investigate more on this and compile the existing information
for the next step. Here we will adapt the macroscopic approach.
|Next step is to
model the space to predict other key parameters. Complex model is not
necessary better that simple one since it requires more sophisticated input
data which is rarely found analytically. We will investigate existing model
and propose new model.
|It is the
purpose of this note that we compile all the pieces of information which is
spread out in the papers but relevant to our goal and propose a new way and
model and finally attempt to make one set of procedure for the displacement
ventilation system design.