How The Closed Circuit Separate Source Works; H O W Th E C L O S E D C Ir C U It S E P A R A T E So U R C E Wo R K S - Conair Thermolator TW-S User Manual

H o w th e C l os ed C i r cu i t S e pa rate So urce Wor ks
Closed Circuit Separate Source models maintain the process temperature by electrically heating and
indirectly cooling fluid in the process circuit. Cooling water supplied by a chiller, tower or other water
source, is never mixed with process fluid. Fluid to fill the process loop is provided by a "separate
source" A brazed plate heat exchanger replaces the mixing tank used on direct injection units.
F
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D
A
B
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3
C
E
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TW-P Closed Circuit Separate Source
The temperature of the process fluid is measured as it
leaves the unit's heater tank. The fluid then flows through
the "To Process" line A to the mold or process. The fluid
returns to the unit through the "From Process" line B for
reheating or cooling.
Alternatively, the temperature of the process fluid may
be measured as it flows into the mixing tank through the
"From Process" line B.
If the temperature is above the setpoint value, the cooling
valve opens. Cool water enters the heat exchanger via the
"Cooling In" line. Process fluid is always being circu-
lated through the process side of the heat exchanger. The
process fluid is indirectly cooled via transmission from
the colder water now running through the cooling side of
the heat exchanger. If the measured temperature is below
the setpoint, the heater elements inside the heater tank are
energized.
The pump moves water from the heat exchanger to the
heater tank. Pressure is measured before and after the pump
with pressure gauge E and F.
De s c ri p ti o n I 2-5