| TEMP RANGE | TOTAL HOURS |
OUTPUT W/O EVAP % EFF MW |
OUTPUT W/EVAP % EFF MW |
MW HR |
$/HR GAIN |
INCREASED EARNINGS |
||
| 60-70 (f) | 877 | 98 | 81.83 | 102 | 85.17 | 3.34 | 200.4 | $175,750.00 |
| 70-80 | 865 | 94.5 | 78.91 | 100 | 83.5 | 4.59 | 275.4 | $238,221.00 |
| 80-90 | 1,040 | 91 | 75.99 | 98 | 81.83 | 5.84 | 350.4 | $364,416.00 |
| 90-100 | 705 | 87 | 72.65 | 96 | 80.16 | 7.51 | 450.6 | $317,673.00 |
| 100-105 | 491 | 83.5 | 69.72 | 95 | 79.33 | 9.61 | 576.42 | $283,022.22 |
| 105-110 | 257 | 82 | 68.47 | 94.5 | 78.81 | 10.34 | 620.4 | $159,442.80 |
| 110-115 | 95 | 80.5 | 67.22 | 94 | 78.94 | 11.27 | 676.2 | $64,239.00 |
| >115 | 30 | 79 | 65.97 | 94 | 78.94 | 12.52 | 751.2 |
$22,536.00 |
| TOTAL | $1,625,300.02 | |||||||
Table 2 above shows only increased earnings from capacity gain.
Efficiency (Heat Rate) gain is also significant. Example: Using the
100-105(f) line above and average cost of $1.90/million BTU's of natural gas..
Fuel Cost Avg. H.R.
Output
Hours Eff (%) increase
Increased Earnings (Efficiency)
$1.90 X 12300 BTU X 79,500 KW
X 491 X (.95 - .835)
= $104,907 (this temp range only)
Notes:
1. 100% efficiency for Turbine without pre-cooling intake air is 83.5 Megawatts output @
ISO conditions of 590(f) at sea level.
2. Dollar value of product is based on $.06 per kilowatt hour. Additional Gas Cost and
water usage is not included.
3. On Combined Cycle Configuration more output in Gas Turbine results in more steam
production for the steam turbine. Typically at the ratio of 1 MW steam for every 2
MW increase of the Gas Turbine. This factor is not included in the above and
contributes to an offset in additional gas usage. Additional water usage is minimal
at the higher output.
4. Total hours are based on climate conditions reported by NOAA for a 3 year running
average for Phoenix, AZ., which is similar to Las Vegas, NV., and other Southwest areas.
5. Evaporative cooling efficiency is based on using 12"
thick Glacier-Cor Super Saturation Rigid Media @ 95% saturation efficiency @ 500 FPM
face velocity.. Noise levels outside the Turbine are greatly reduced with the installation of the
Premier Air Inlet Cooling/Filtration Unit configuration..
ASSUMPTIONS: Increased earnings are based on Turbine operation
during all hours available for evaporative cooling use as indicated.
Downtime for the Turbine is not taken into consideration. Actual increased earnings would
have to be determined on each operating hour.
Climate conditions are based on inlet air humidity of .0064/lbs of moisture per pound of
dry air at sea level pressure of 101kPA. This condition will vary based on actual climate
conditions.
Payback period from Evaporative Cooling
Payback period can be generally determined (estimated) by the following
formula:
(A + B + C + D) - E
A = Acquisition cost less tax/investment credits.
B = Operating costs such as increased fuel, water, etc.
C = Maintenance costs including expendable equipment replacement.
D = Depreciation provision can be included if desired.
E = Increased Earnings due to higher Turbine efficiencies.
A very significant source of additional savings with a short-term payback period is an investment in Evaporative Coolers for Generators. A typical installation is to mount Evaporative Cooling Modules on each side of the Generator room and use exhaust air to be pulled through the coolers and over the generators. Cooling is needed to keep the generator in it's design operating range.
Click here to go to actual performance data of
Westinghouse 501B6 Turbine during 1998.
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