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

[Chris Jones <cj@xxxxxxxxx>]

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@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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Chris Jones, P.Eng.
14 Oneida Avenue
Toronto, ON M5J2E3
Tel. 416 203-7465
Fax. 416 946-1005

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