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CTV-PRC007-EN6
Comparing the Attributes of
Low Pressure Chiller Operation
to High Pressure Chiller
Operation.
Trane CenTraVac chillers continue to offer
time tested and proven low pressure
refrigerants including the alternative
environment friendly HCFC- 123. Trane
CenTraVac chillers provide the safety of
low pressure with continued product
improvement in leak proof design.
Consider the following benefits of low
pressure over high pressure chillers.
Low Pressure Medium/High Pressure
Evaporator
•
Always at low negative pressure
•
Always at positive pressure
•
Air leaks inward at low rate
•
Refrigerant leaks outward at moderate rate
•
Refrigerant lost: (# air leak in) x purge efficiency*
•
No refrigerant loss is into equipment room (vented to the
•
Refrigerant loss is into equipment room
outside via purge)
Condenser
•
At positive pressure during operation
•
Always at high positive pressure
•
Usually at negative pressure during inactivity (air leaks
inward)
•
Refrigerant leaks outward at very low rate during operation
•
Refrigerant leaks outward at very high rate
Monitoring
•
Trane Purifier Purge is able to continuously monitor
•
Only ways to monitor leak rate on high pressure chiller are
of leak rate in-leakage with a purge timer — periodic leak checks
•
Refrigerant monitor as required by ASHRAE — purchase refrigerant monitor
•
Purge timer can be connected to building automation
•
Refrigerant monitor as required by ASHRAE
system for notification of increased purge operation (in-
•
Normally the only time that a leak is detected on a high
leak). Similarly, the refrigerant monitor can be connected to pressure chiller is during spring start-up. This means that a
the building automation system. chiller which develops a leak in the summer, may leak
continuously until the following spring.
HCFC-123 HFC-134a
Typical
Pressures Evap: 18.7 inches of Mercury Evap: 33.1 psig
(38°F evap.) Cond: 6.1 psig Cond: 124.1 psig
(100°F cond.)
*Trane Purifier Purge efficiency does not exceed 0.002 lbs./refrigerant/lbs.-air
Features and
Benefits
Attributes of
Low Pressure
Chiller Operation