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

[K Emerson <kemerson2002@xxxxxxxxx>]

Varkie, I don't know where you got the idea that steam
distributed through a district system is "waste
energy."  While about 2/3 of the energy going out the
cooling tower is from condensing steam back into
water, turbine discharge pressures at a typical power
plant are sub-atmospheric (relatively low
temperatures).  Bleed steam taken out of a point on
the turbine and put into a district system is steam
that is not generating all the electric power that it
could.  

Keith

PS The likely reason that summer rates are being
offered is to boost sales and improve load factor in
the non-heating season.  




--- Varkie Thomas <Varkie.Thomas@xxxxxxx> 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@xxxxxxxx] 
> 
> 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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