Technical information

Page: 70
VL Series Portable Chillers, 2 to 40 Tons UGH021/0301
8.5 MAINTAINING PROPER WATER FLOW
A. The evaporator in a typical
water chiller is flow sensitive.
That is, the efficiency of
operation is directly related
to the flow of liquid.
Maximum efficiency is
obtained at approximately
2.4gpm per ton of rated
capacity. Low liquid flow can
reduce efficiency and in
some cases allow ice to form
in the evaporator which can
damage the evaporator.
B. The Conair one pump chiller
system is designed so that all
process flow must pass
through the evaporator. If
the process flow is less than
the 2.4 gpm required, then
it will be necessary to install
a low flow bypass system in
the process lines (see section
8.6). This will allow a portion of the process flow to bypass the
process and return directly to the chiller to keep the total flow
above the 2.4 gpm per ton requirement.
C. To assure proper flow on central chillers. Conair installs a low flow
safety switch to stop the refrigeration system if the liquid flow falls
to approximately 33% of full flow. This is a paddle type flow switch
which is mounted directly in the water stream.
21 GPM 5 GPM
5 GPM21 GPM
BYPASS
THROTTLING
VALVE -
16 GPM
CHILLER PROCESS
The evaporator is the
heat exchanger where in
the refrigeration circuit
that allows the liquid
refrigerant to absorb heat
from the water. As the
heat is absorbed, the
liquid refrigerant changes
state from liquid to vapor,
and the water is chilled.