Civil Engineering Reference
In-Depth Information
Fig. 8.13
Under-fl oor air distribution series, fan-powered VAV
loss in water coils are other sources that can indirectly increase the energy con-
sumption of the system. The small energy consumed by low voltage power provided
for control valves and dampers, and the power input to the variable frequency drives
for supply and return fans that can be factored in supply and return fan consumption
itself are the other sources of energy consumption.
8.13.4
UFAD VAV w/ Baseboard Heating
This system is similar to a variable air volume system with baseboard heaters except
that (1) instead of using the duct for air delivery, it uses the under-fl oor plenum
space, (2) there is an additional return-air bypass arrangement which is used to
bypass return air to upstream of the fan in order to provide suffi cient dehumidifi ca-
tion when it is needed, without the need for a reheat coil.
Utilizing this system similar to the previous system not only results in saving
energy by delivering air with a higher temperature than what is usually used in
traditional cooling systems, but also creates higher occupant comfort by deliver-
ing air with lower speed than what is used in traditional systems, and where it is
most effective.
