[BLDG-SIM] Steam-Turbine Drive Centrigugal LiquidChillers - UPDATE

[Chris Jones]

District steam is not always waste energy from a power plant.  In the case 
that district steam is just for heating and cooling, then the ASHRAE 90.1 
states correctly that the heating and/or cooling should be modelled as 
purchased using the applicable rate.  For situations were the building uses 
steam that can't be used by the power plant I would suggest that the 
proposed would only get credit if the overall steam efficiency (work out/ 
fuel in) is greater than 75% AFUE.  This is the budget building 
perscriptive requirement for steam boilers.  LEED should not give credit 
for using a convenient heat/cool source if that source is inefficient overall.


At 15:24 12/11/2004, Varkie Thomas wrote:
>
>At the end of this message is the part load performance of steam turbine 
>chillers.  As you can see from the response from Rob Firnstein of York, 
>energy software developers can incorporate this data into their programs.
>
>Steam turbine chillers have recently been specified for buildings in 
>NYC.  ConEd has low summer rates for steam.  Cities like Boston, 
>Minneapolis and Philadelphia also provide district steam.  Since district 
>steam is waste energy from a power plant perhaps there should be LEED 
>credits for using this waste energy although the ECB method might show 
>higher costs over electric centrifugal.
>
>Varkie Thomas
>
>
>-----Original Message-----
>From: Robert Firnstein [mailto:robert.firnstein at york.com]
>Sent: Thursday, November 11, 2004 3:20 PM
>To: Varkie Thomas
>Subject: RE: Steam Turbine YK rating
>
>Varkie,
>
>Feel free to forward on the information. Recently, York re-designed the
>software for selecting our steam turbine chillers so that we now have
>greater capability to pair compressors and steam turbines for optimum
>performance. If you are interested in seeing any generic selections for
>additional chillers please let me know.
>
>Regards,
>
>Rob Firnstein
>Sales Engineer
>York International - Chicago
>PH:(847)493-6124 FX:(847)759-0676
>
>Part Load Performance at Condenser Water Temperatures (CWT)
>Constant Speed Operation at 4500 RPM, 125 PSIG D&S Steam Supply, Producing 
>41oF Chilled Water
>      RCLWT = Refrigerant Condenser Leaving Water Temperature
>CWT     % 
>Load        100%     90%       80%      70%      60%      50%    40% 
>30%    20%    15%
>             Tons            1800        1620        1440        1260 
>   1080       900       720       540       360       270
>85oF      BHP            1,378.0     1,210.6     1,058.2     923.6 
>802.4      690.4     583.9     - - -       - - -       - - -
>             Lbs/Hr         17,873     15,919      13,884     12,210 
> 10,744     9,383     8,029     - - -       - - -       - - -
>             Lbs/TR-Hr    9.93        9.83         9.64        9.69 
> 9.95        10.43     11.15     - - -       - - -       - - -
>             RCLWT 
> oF    94.33       93.38       92.43       91.50      90.57      89.67 
> 88.76     - - -       - - -       - - -
>75oF      BHP            1,182.8     1,043.2     918.6       808.1 
>706.6      611.3     519.1     427.5     335.3     307.1
>             Lbs/Hr         15,069     13,395      11,832     10,497 
> 9,264      8,106     6,982     5,912     4,781     4,453
>             Lbs/TR-Hr    8.37        8.27         8.22        8.33 
> 8.58        9.01      9.70      10.95     13.28     16.49
>             RCLWT 
> oF    84.14       83.20       82.28       81.37      80.47      79.58 
> 78.69     77.80     76.92     76.34
>65oF      BHP            1,035.7     921.1       817.9       723.4 
>634.6      550.3     467.6     384.3     299.7     264.8
>             Lbs/Hr         13,008     11,633      10,412     9,332 
> 8,180      7,215     6,256     5,292     4,307     3,901
>             Lbs/TR-Hr    7.23        7.18         7.23        7.41 
> 7.57        8.02      8.69      9.80      11.96     14.45
>             RCLWT 
> oF    73.99       73.08       72.18       71.28      70.40      69.52 
> 68.64     67.76     66.88     66.42
>55oF      BHP            926.6       828.4       738.3       654.3 
>574.3      496.1     418.8     339.9     259.5     220.2
>             Lbs/Hr         11,527     10,405      9,369       8,408 
> 7,485      6,588     5,691     4,776     3,834     3,365
>             Lbs/TR-Hr    6.40        6.42         6.51        6.67 
> 6.93        7.32      7.90      8.84      10.65     12.46
>             RCLWT 
> oF    63.87       62.98       62.09       61.21      60.34      59.46 
> 58.59     57.72     56.84     56.43
>
>
>
>
>
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Chris Jones, P.Eng.
14 Oneida Avenue
Toronto, ON M5J2E3
Tel. 416 203-7465
Fax. 416 946-1005 

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