Specifications

11
HUMIDITY CONTROL TECHNOLOGY
glycol which is 95-percent less expensive and an
environmentally-preferred heat transfer fluid for LEED
®
and other sustainable building projects.
All DX systems have outdoor condensers and hot gas
reheat coils that flood with liquid refrigerant for extended
periods. The result is a large system charge, which
aside from being expensive, creates the tendancy
for oil migration and premature compressor failure.
The Protocol Series’ heat exchangers instead transfer
refrigerant heat to glycol loop (see Figure 4) which is then
used for air reheat or heat rejection to outdoor air cooled
dry coolers.
The result is greater system reliability and reduced
project costs. Not only is there a huge savings in
refrigerant charge, but there are also additional
installation cost savings because external PVC glycol
piping to dry coolers is less expensive to install in labor/
materials than copper refrigerant piping. The dry cooler
system also has reduced liklihod of refrigerant leaks and
longer compressor life which further reduces lifetime
cost of ownership.
It should be noted this technology is not new; dry
coolers have been employed in precision computer-
room air-conditioning systems and environmentally
sensitive areas for decades.
Warm
Humid Air
Evaporator
Cool
Saturated Air
Warm Drier
Air
Hot Energy
Rich Refrigerant
Flat Plate
Refrigerant/Fluid
Heat Exchanger
Hot Fluid
(glycol)
Direct Drive
Plenum Fan
Warm Drier
Air
Pool Water
Heater
NP (Protocol) System Design
0-100%
Modulating
Air Reheat
Compressor
Cool, Energy
Rich Refrigerant
Remote Fluid Cooler
Figure 4 – Seresco’s NP Series (Protocol Technology)