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  Trane Company (The)   CenTraVac Liquid Chillers - 11/97  

CenTraVac Liquid Chillers - 11/97 - Page 10

   

CenTraVac Liquid Chillers - 11/97

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



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