[BLDG-SIM] Steam-Turbine Drive Centrigugal LiquidChillers - UPDATE
K Emerson
kemerson2002 at yahoo.com
Fri Nov 12 14:51:59 PST 2004
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 at som.com> 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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