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SITE DATA FOR LAST 2 YEARS
Month
Day
( 8 a.m. to 8
p.m.)DBT (0C)
Average Solar
Radiation
Intensity
KWhr/s m
Area (
m2)
Heating
Effect
Temp
Drop
Jan 25.90 4.77 40000.00 7950.00 4.52
Feb 28.80 5.67 40000.00 9450.00 5.37
Mar 31.22 6.57 40000.00 10950.00 6.22
Apr 34.35 7.16 40000.00 11933.33 6.78
May 34.60 7.41 40000.00 12350.00 7.02
June 32.41 6.25 40000.00 10416.67 5.92
July 29.45 4.87 40000.00 8116.67 4.61
Aug 28.26 4.52 40000.00 7533.33 4.28
Sept 29.56 5.46 40000.00 9100.00 5.17
Oct 32.11 5.66 40000.00 9433.33 5.36
Nov 29.58 5.05 40000.00 8416.67 4.78
Dec 26.51 4.58 40000.00 7633.33 4.34
AVERAGE 5.36
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Jan Feb Mar Apr May June Jul
Series1 25.90 28.80 31.22 34.35 34.60 32.41 29.
Series2 4.77 5.67 6.57 7.16 7.41 6.25 4.8
26 2
9 31 3
4
35
3
2
0.00
5.00
10.00
15.00
20.00
25.0030.00
35.00
40.00
Ambient air Temperature
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Power
Gain
16.26
19.33
22.40
24.41
25.26
21.31
16.60
15.41
18.61
19.30
17.22
15.61
19.31
1 2 3 4 5 6 7 8 9 10 11 12
Power gain 16.26 19.33 22.40 24.41 25.26 21.31 16.60 15.41 18.61
19.30 17.22 15.61
Temp Drop 4.52 5.37 6.22 6.78 7.02 5.92 4.61 4.28 5.17 5.36 4.78
4.34
Solar Int 4.77 5.67 6.57 7.16 7.41 6.25 4.87 4.52 5.46 5.66 5.05
4.58
5 56 7 7 6
5 4 55 5 4
16
19
2224 25
21
1715
19 1917
1
5
6
77 7
6
55
5 65
5
0.00
5.00
10.00
15.00
20.00
25.00
30.00
35.00
POWER GAIN THROUGH INLET AIR COOLING
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Aug Sept Oct Nov Dec
5 28.26 29.56 32.11 29.58 26.51
7 4.52 5.46 5.66 5.05 4.58
29
28
30
3
2
30
27
0.00
1.00
2.00
3.00
4.00
5.006.00
7.00
8.00
( deg C)
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0.00
3.00
6.00
9.00
12.00
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Assumption :
a
b
c
de
f
Sl Description Unit Value
A) Heat Rate Gain
1) Average operation of system in a year (10 hrs a daily for 300
days) Hrs 3,000.0
2)Increase in power output (ie reduction of temp by average
5.4
oC from
design) @ 0.55% per 1oC of CC power output.
MW 19.5
4) Additional Auxiliary Power Cons of Cooling Air system MW
1.5
5) Gain in CC Power Output (3) - (4) MW 18.0
7) Net Energy gain (3000 hrs x Net Power Output gain) MU
54.0
Heat Gain in Deaerator due to Hot water supply. Kcal/kwh 2.7
11) Station Heat Rate at 27 oC at base load Kcal/kwh 1,995.0
12) Station Heat Rate with maintaining Nox 150 PPM at base load.
Kcal/kwh 1,930.0
14)Gain in Station Heat Rate (By reducing the inlet air temp. by
average 5.4
oC)
@ 0.075% per 1oC or @ 1.5 kcal/kwh per 1
oC
Kcal/kwh 8.1
15) Loss in Station Heat Rate due to increase in Filter DP (15
mm WC) Kcal/kwh 3.5
16) Total Heat Rate gain Kcal/kwh 7.3
B) Net gain in MU MU 48.7
C) Financial Gain :
1)Financial Gain due to gain in Station Heat Rate (assuming 95%
loading factor) @
variable cost of Rs. 2.0/kwh & actual Station Heat Rate 2020
Kcal/kwh)
Rs in
Crore11.39
F) Total Investment of Inlet Air Cooling Chilling SystemRs
in
Crore8.00
G) Total Investment of Solar Heating SystemRs in
Crore24.00
Total InvestmentRs in
Crore32.00
H) Payback period Years 2.8
Water injection shall be kept for maintaining Nox 150 PPM &
improvement in heat rate
Cost Benefit AnalysisInstallation of Gas Turbine Inlet Air
Cooling System by Solar assisted vapour absorption system.
Average DBT for day hour (ie 08:00 to 06:00 hrs) of 30.5oC has
been considered based on online data collected
for 2 years..
OEM Correction curves applied for Station Load (0.55%/3.5 MW)
& Combine Cycle Heat Rate (0.075%/1.5
Kcal/Kwhr) per degree celcius
Generation of 95% station capacity has been considered.
Additional Auxiliary Power cons. of 1.5 MW for electrical
chilling system has been considered for all three Gas
Turbines
Variable cost of Generation w.r.t Fuel cost @ Rs. 2.34/KWHr. has
been considered.
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CALCULATION OF PARABOLIC TROUGH HEATING AREA
Designed air temperature drop at Peak summer (deg C) 7
Air flow rate through Inlet air filters ( kg/s) 460
COP = Desired Cooling effect/ Heat Input
Cooling effect required in evaporator (Kj/s) 3236.1
Designed COP of the refrigeration of the system 0.8
Required Heat Input (Kj/s) 4045.125
Cumulative heat Input for all 3 nos. Gas Turbines. 12135.375
Peak Summer sun Intensity( Kwhr/m2/day) 7.41
Total Heating area required.(m2) 39304.8583
Designed Heat Area. (m2) 40,000
