Features and
Benefits
Innovative System Options
Low Pressure Benefit — A significant difference over
high pressure chillers. 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
- 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
outside via purge)
|
- Always at positive pressure
- Refrigerant loss is into equipment room
|
| Condenser |
- At positive pressure during operation
- Usually at negative pressure during inactivity (air leaks
inward)
- Refrigerant leaks outward at very low rate during operation
|
- Always at high positive pressure
- Refrigerant leaks outward at very high rate Monitoring
|
| |
- Trane Purifier Purge is able to continuously monitor
- Refrigerant monitor as required by ASHRAE
- Purge timer can be connected to building automationsystem
for notification of increased purge operation (in- leak). Similarly, the refrigerant monitor can be connected to
the building automation system.
|
- Only ways to monitor leak rate on high pressure chiller are
of leak rate in-leakage with a purge timer —
periodic leak checks— purchase refrigerant monitor
- Refrigerant monitor as required by ASHRAE
- Normally the only time that a leak is detected on a high
pressure chiller is during spring start-up. This means that a chiller which develops a
leak in the summer, may leak continuously
until the following spring.
|
| |
HCFC-123 |
HFC-134a |
| Typical Pressures (38 F evap.) (100 F cond.) |
Evap: 18.7 inches of Mercury Cond: 6.1 psig |
Evap: 33.1 psig Cond: 124.1 psig |
*Trane Purifier Purge efficiency does not
exceed 0.002 lbs./refrigerant/lbs.-air
Heat Recovery
The Trane Heat Recovery CenTraVac® chiller is
an excellent choice for applications requiring simultaneous heating and cooling. CenTraVac
models save energy by recovering heat normally rejected to the atmosphere and putting that
energy to use providing space heating, building hot water or process hot water. This heat
is provided at a fraction of conventional heating systems cost. A heat recovery CenTraVac
can provide 95 to 120 F hot water.
An advanced computer selection program chooses a heat
recovery condenser to match your needs. Two separate condenser shells are used with the
Heat Recovery CenTraVac chiller. The heating circuit and cooling tower circuit are
separate, preventing cross contamination. Refrigerant gas from the compressor flows into
both condenser shells allowing heat rejection to one or both condenser water circuits.
The reliability of the Heat Recovery CenTraVac chiller has
been proven in installations around the world. This option is completely factory packaged.
Auxiliary Condenser
The Trane auxiliary condenser provides economical heat
recovery for applications with small heating demand. It’s well-suited to preheat
applications including domestic hot water, boiler makeup water and swimming pools.
The auxiliary condenser not only captures energy otherwise
lost, it also increases chiller efficiency.
Auxiliary condensers are available in two sizes: standard
and large. Because the auxiliary condenser is a separate condenser, there is no cross
contamination between the cooling tower water and the heat recovery water circuits.
No temperature controls are required. Auxiliary condensers
are factory mounted and tested.
Other Factory Installed Unit Options Include:
- Marine waterboxes for easy access to the condenser and
evaporator tubes for maintenance
- UL label
- Factory installed insulation
- 150 psig waterboxes standard; higher pressures available
- Three-pass evaporator/one-pass evaporator
- Smooth bore tubes
- Full complement of electrical starters and accessories (unit
mounted or remote)
- Special construction to facilitate chiller disassembly for
construction projects with tight space clearances or component weight limitations.
- Cu/Ni tubes
- Special paint and controls for outdoor use or corrosive
environments
- Free cooling
- Various tube wall thicknesses
- Internally enhanced tubes
- Unit mounted refrigerant monitor
|
