MAXE™ YST Steam-Turbine Drive Chillers

Break the Ties to Electrical Power

2

Avoiding dependency on costly electricityYear after year, the availability of affordableand reliable electricity concerns owners of commercial, industrial, and institutional facilities. That’s why owners continue to look for alternatives to minimize theirdependency on utility-sourced electricity.

Furthermore, the emphasis on environmentallyresponsible, distributed-energy systemsrequires efficient recovery of exhaustedheat. Cogeneration systems and boilers thatneed to operate year-round to meet sitedemand run inefficiently at low loads in summer.

In many systems, a more effective strategycan be attained by maintaining high firingrates throughout the summer by producingsteam for building or process cooling.

This strategy not only improves operatingefficiency, it also cuts electric consumption,thereby reducing annual operating costs.Add the savings obtained from utilityrebates and demand-side managementstrategies that reduce peak electric rates, and steam becomes a much more affordable, more reliable way to keep cool than electricity alone.

Get the most efficient use of steam for coolingTo get maximum advantage from steam for mechanical cooling, it takes advancedchiller technology configured and optimizedfor the required conditions—all realized witha MAXE YST steam-turbine-drive chiller from YORK®.

Get off the grid with the hottestGet off the grid with the hottest

Ste

am-P

lan

t L

oad

Ste

am-P

lan

t E

ffic

ien

cy

Effect of Level-Loading a Steam Plant

Steam Plant without YST Chiller: Load

Efficiency

J F M A M J J A S O N D

Efficiency

Steam Plant with YST Chiller: Load

The use of a MAXE YST steam-driven chiller improvescogeneration system and boiler plant utilization.

3

YORK’s decades of history with steam systems has culminated in the mostadvanced alternative-fuel chiller. YORKengineering ensures that an efficient, multistage, steam turbine is integrated withthe optimal steam condenser to make themost efficient use of available energy topower the chiller. The drive is configuredwith the proven efficiency of a YORK MAXEcentrifugal chiller. The result: unbeatableefficiency at real-world operating conditions.

Focus on minimizing operating costsIn the real world, chillers operate nearly 99% of the time at off-design conditions.Consequently, how a chiller operates at off-design determines the real energy costs.The MAXE YST chiller is designed to deliver

superior performance at both design and off-design conditions. It is engineered to takeadvantage of the steam turbine’s inherentvariable-speed, capability to seamlessly optimize chiller speed and to handle lowentering-condenser-water temperatures,allowing the system to operate at thehighest efficiency — standard features in all YST chillers.

Load (%)

Tim

e (%

)

Typical Chiller Load Profile

0

05

101520253035404550

13 25 38 50 63 75 88 100

Chillers spend nearly99% of operating hoursat off-design conditions.

energy source for cooling — steam

4

Application flexibilityThe MAXE YST chiller handles all the usualoperating conditions you normally encounterwith traditional chillers, including a widerange of leaving-chilled-water temperatures, entering-condenser-water temperatures, and fluid flows.

Furthermore, the YST platform has beendesigned for all normal steam pressures.However, should you have an unusualsteam condition, YORK has the flexibility to accommodate this also.

Modular configurationprovides maximum flexibilityTypically, manufacturing a steam-turbinechiller is an engineering-intensive processthat involves integrating many different components. But YORK works smarter.We’ve evaluated each system component to dramatically simplify the overall chiller design.

The YORK YST steam-turbine chiller employsa fully modular concept. Components can beeasily mixed and matched. Components arepre-designed to take advantage of advancedmanufacturing techniques and ensure properfit and prompt delivery.

Compact packaging with the

Compact footprintTraditional steam-turbine chillers require significant real estate. The YST chillerplaces the steam condenser on top of thechiller, so the footprint is no greater than acompact electrical chiller. Where preferred,the traditional side-mounting of the steamcondenser can be selected from the extensive list of available options.

Handle industrial duty with industrial optionsDemanding industrial applications require a standard array of options that make iteasy to meet customer needs. Using theversatile YST packaged design as a baseplatform, YORK has the unique ability tocustom configure a unit to meet your special requirements.

Low noiseBecause it uses a quiet steam-turbine driveinstead of an electric motor, a YORK YSTchiller operates at significantly reduced soundlevels compared to many electric chillers.

flexibility to fit any job

Born out of an industrial design.

5

The steam condenser can be top-mounted (far left) or side-mounted

Optimized to control steamPrevious-generation, steam-turbine chillersused a composite of various componentcontrols. The YST is the first steam-turbinechiller where the control system has beendeveloped from the ground up to control thecomplete chiller. At the heart of the systemis the OptiView™ Control Center. Its powerfulmicroprocessor and graphical user interfaceset the standard by presenting more data inthe friendliest possible way.

In operation, proven OptiView control logiccontinually monitors all chiller and steamconditions, and automatically determines the most efficient way to run the chiller.Furthermore, the control algorithms havebeen developed from process-industry experience to ensure that the YST chiller will handle extraordinary operating conditionsin a controlled and safe manner.

Instantly grasp the big pictureYORK has packaged the control system so carefully that a lack of steam-operatorexperience is not a problem. Thanks to thelarge, OptiView active-matrix color screen, data is shown in association with illustrationsof the key chiller components. The clearlayout, animated graphics and plain-languagereadouts are easy to read, virtually eliminating operator confusion. Visual cuesexplain key information, making operationessentially intuitive.

Sophisticated controls specifically

6

7

Information when and where you want itWith the OptiView touchscreen, all key data is available for review at your fingertips.Detailed data logs and trending can be displayed directly on a single screen—orprinted logs can be generated automaticallyat predetermined time intervals. Systeminformation can also be downloaded to a PC to simplify performance and troubleshooting analysis.

Start the system automaticallyTraditionally, steam-turbine chillers requiredmanual starting. Available with the YSTchiller is an industry first — fully automaticstarting of the chiller. The option is enabledby the OptiView Control Center and theaddition of automatic valves, solenoids and sensors

Full system connectivityThe OptiView Control Center is designed tocommunicate with most building andprocess-management systems on themarket today, including BACnet, LonMarkand MODBUS systems. An open protocolallows all operating data to be accessed andread anywhere on the network.

designed for steam

R-134a: The long-termrefrigerant of choiceTo ensure your chiller satisfies environ-mental concerns over the long haul, MAXE YST steam-turbine-drive chillers useHFC-134a, which has zero ozone-depletionpotential — making it the only major refrig-erant without any phase-out schedule.

Decades of worry-free operationYST chillers are built for industrial-duty toserve as your primary chiller. You can counton YST chillers to provide the same low-maintenance, highly reliable operation, andlong service life that make YORK centrifugalchillers the preferred choice in the mostdemanding applications in the world.

Where technology and service expertise come togetherBy integrating proven steam turbine-drivetechnology with our MAXE centrifugal chillerdesign and OptiView Control Center, YORKhas created the most efficient, most reliableway possible to maximize your real-worldenergy savings.

YORK also offers services to deliver the full benefit from the start. Our YORK salesengineers and project management teamare specially trained to complete yourproject on time and on budget. Then, YORK technicians can implement start-upand commissioning, as well as train in-house staff. Finally, factory-trained servicetechnicians can provide contracted maintenance procedures, as well as perform repairs and enhancements to maximize your savings over your equipment’s entire lifecycle.

Reliability that pays you back inlong-term savings, peace of mind

P.O. Box 1592, York, Pennsylvania USA 17405-1592 Tele. 800-861-1001 Subject to change without notice. Printed in USA© 2004 YORK International Corporation www.york.com ALL RIGHTS RESERVEDForm 160.67-SG1 (204)

For the talent and technology to reduce dependency on costly electricity, call your nearby YORK Sales Engineer today.