MODEL YMC2 MAGNETIC BEARING CENTRIFUGAL LIQUID CHILLERS
66Pages

Nomenclature SYSTEM NOMENCLATURE Y M C 2 - S 0756 A B Magnetic Bearing Centrifugal Chiller S = Single Stage T = Two Stage Gas Path Revision Level Impeller Design Revision Level Motor Design Level Impeller Tip Diameter (mm) Rotation F = Forward R = Reverse Inlet from Front View R = Right L = Left Vessel E = Evaporator C = Condenser Heat Exchanger Mod Level Waterbox Type C = Compact M = Marine Nominal Inside Diameter (Inches) Nominal Length (Feet) Water Connection Type F = Flanges G = Grooved Standard A = Victaulic AGS Marketing Tube Number Tube Code B = 3/4" Code 1 C = 3/4" Code 2 D = 3/4"...

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The YORK® YMC² chiller offers a full package of features for total owner satisfaction. Key benefits include efficiency, sustainability, quiet operation, and reliability. EFFICIENCY Off-design is not only part load, but full load operation as well, with reduced entering condenser water temperatures (ECWTs) Actual chiller efficiency cannot be determined by analyzing the theoretical efficiency of any one chiller component. It requires a specific combination of heat exchanger, compressor, and motor performance to achieve the lowest system kW/ton. YMC² technology matches chiller system...

Introduction (Cont'd) SUSTAINABILITY Ninty-eight percent of the global-warming potential (GWP) of a centrifugal chiller is from the indirect effect – or the greenhouse gases generated in the production of electricity to run the chiller. Two percent of the GWP is from the direct effect or release of the refrigerant gases into the atmosphere. To address the direct effect, the YMC² chiller first reduces the chances for refrigerant leaks by dramatically reducing the number of connections, down 57% compared to traditional chiller designs. Then we have employed falling-film evaporator technology...

Introduction (Cont'd) RELIABILITY Designed for the most reliable chillers we have ever made, the YMC² YORK Magnetic Bearing Compressor will achieve a much better performance because it is based on a successful line of efficient YORK single-stage compressors. With fewer moving parts and straightforward design, YORK single-stage compressors have proven durability in numerous applications, especially applications where minimal downtime is a critical concern. The YMC² chiller is driven by a Johnson Controls OptiSpeed™ variable-speed drive (VSD) to ensure optimal Real-World performance...

Sustainability Focus OZONE-DEPLETION POTENTIAL (ODP) The YORK YMC² chiller employs one the most environmentally friendly refrigerants available today, HFC-134a, with no Ozone Depletion Potential (ODP) and no phase out date per the Montreal Protocol. Ozone is a very small part of the atmosphere, but its presence is nevertheless vital to human well-being. Most ozone resides in the upper part of the atmosphere. This region, called the stratosphere, is more than 10 kilometers (6 miles) above the Earth’s surface. There, about 90% of atmospheric ozone is contained in the “ozone layer,” which...

Sustainablity Focus (Cont'd) Monitoring stations showed that ozone-depleting chemicals were steadily increasing in the atmosphere. These trends were linked to growing production and use of chemicals like chlorofluorocarbons (CFCs) for refrigeration and air conditioning, foam blowing, and industrial cleaning. Measurements in the laboratory and the atmosphere characterized the chemical reactions that were involved in ozone destruction. Computer models employing this information could predict how much ozone depletion was occurring and how much more could occur in the future. Observations of...

Sustainablity Focus (Cont'd) The Montreal Protocol does not extend to HFCs as they have no ODP nor does it extend to natural refrigerants for the same reason. The typical usage of the refrigerant, the phase-out status by the Montreal Protocol and the global usage of refrigerant in tons is shown in the table on page 8. The chart below shows the growing use of HFC-134a in centrifugal chillers from 1995 up to 2010 and the forecast until the phase-out of HCFCs. Figure 2 - CO2 EMISSIONS GLOBAL WARMING POTENTIAL (GWP) Another main environmental topic is Global Warming potential (GWP), and when we...

Sustainablity Focus (Cont'd) DIRECT & INDIRECT GLOBAL WARMING POTENTIAL 98% of the global warming potential of a centrifugal chiller is from the indirect effect or the greenhouse gases produced to generate the electricity to run the chiller. The YORK YMC2 centrifugal chiller and its superior efficiency levels dramatically reduces the indirect GWP. Two percent of the GWP is from the direct effect or release of the refrigerant gases FIGURE 3 - DIRECT AND INDIRECT GLOBAL WARMING POTENTIAL Minimizing the total climatic impact (direct and indirect GWP) requires a comprehensive approach to...

AHRI CERTIFICATION PROGRAM The performance of the YMC² chiller has been certified to the Air Conditioning, Heating and Refrigeration Institute (AHRI) as complying with the certification sections of the latest issue of AHRI Standard 550/590. Under this Certification Program, chillers are regularly tested in strict compliance with this Standard. This provides an independent, third-party verification of chiller performance. COMPUTERIZED PERFORMANCE RATINGS Each chiller is custom-matched to meet the individual building load and energy requirements. A variety of standard heat exchangers and pass...

Ratings (Cont'd) YMC² Chiller Performance 250 Tons Part-load information can be easily and accurately generated by a computer. And because it is so important to an owner’s operating budget, this information has now been standardized within the AHRI Certification Program in the form of an Integrated Partload Value (IPLV), and Non-Standard Partload Value (NPLV). The current IPLV/NPLV formula from AHRI Standard 550/590 more closely tracks actual chiller operations, and provides a more accurate indication of a chiller's performance than the previous IPLV/APLV formula. A more detailed analysis...