part 1: overview of cogeneration and its status in asia - Fire
part 1: overview of cogeneration and its status in asia - Fire
part 1: overview of cogeneration and its status in asia - Fire
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Summary <strong>of</strong> country study – Bangladesh 153<br />
What if the electricity price escalates faster?<br />
Internal Rate <strong>of</strong> Return<br />
(IRR)<br />
49%<br />
47%<br />
45%<br />
43%<br />
41%<br />
39%<br />
37%<br />
35%<br />
REPM<br />
GTPM<br />
6% 7% 8% 9% 10% 11% 12% 13%<br />
% <strong>of</strong> Increase Fuel Price Escalation Rate<br />
From the sensitivity analysis <strong>of</strong> the potential <strong>cogeneration</strong> alternatives for the hospital, the<br />
reciprocat<strong>in</strong>g eng<strong>in</strong>e power match option meet<strong>in</strong>g power requirement <strong>of</strong> 800 kW is found to<br />
be the most suitable <strong>cogeneration</strong> system. It represents an <strong>in</strong>itial <strong>in</strong>vestment <strong>of</strong> 35.6 Million<br />
Taka <strong>and</strong> leads to an <strong>in</strong>ternal rate <strong>of</strong> return <strong>of</strong> 43.5 per cent.<br />
3.3.5 Hotel<br />
This hotel operates throughout the year. Electricity is required for light<strong>in</strong>g, air condition<strong>in</strong>g<br />
<strong>and</strong> motors, <strong>and</strong> a lot <strong>of</strong> steam is required for various applications.<br />
Analysis <strong>of</strong> the monthly electricity <strong>and</strong> steam consumption data <strong>of</strong> 1997 led to the follow<strong>in</strong>g:<br />
• Total Electricity Consumption <strong>in</strong> 1997: 8,580 MWh<br />
• Maximum Electricity Dem<strong>and</strong>: 1,000 kW<br />
• M<strong>in</strong>imum Electricity Dem<strong>and</strong>: 900 kW<br />
• Total Thermal Energy Consumption <strong>in</strong> 1997: 137 TJ<br />
• Maximum Steam Dem<strong>and</strong>: 9.25 ton/hr<br />
M<strong>in</strong>imum Steam Dem<strong>and</strong>: 8.02 ton/hr<br />
The power-to-heat ratio <strong>of</strong> the site was calculated to be 0.23 for 1997. Typical <strong>cogeneration</strong><br />
system suitable for this site would be based on steam turb<strong>in</strong>e. However, reciprocat<strong>in</strong>g<br />
eng<strong>in</strong>e <strong>and</strong> gas turb<strong>in</strong>e <strong>cogeneration</strong> systems were also considered as potential alternatives.<br />
Results <strong>of</strong> the feasibility study are summarized <strong>in</strong> Table 3.10.<br />
The steam turb<strong>in</strong>e option is found to be not suitable: (i) with steam turb<strong>in</strong>e thermal match<br />
(STTM), less than 65 per cent <strong>of</strong> the power requirement is generated <strong>and</strong> the hotel will have<br />
to depend on the utility grid; (ii) with steam turb<strong>in</strong>e power match (STPM), only a small<br />
amount <strong>of</strong> excess heat is generated.<br />
With the reciprocat<strong>in</strong>g eng<strong>in</strong>e thermal match (RETM) option, 900 per cent excess power is<br />
generated. The project pr<strong>of</strong>itability will depend on the buy-back rate. This may not be a good<br />
option as the purpose is not to earn from electricity sale. Reciprocat<strong>in</strong>g eng<strong>in</strong>e power match<br />
(REPM) option seems good as almost all the power needed can be met though there will be<br />
small (15 per cent) shortage <strong>in</strong> the heat supply. There is no need for an auxiliary boiler as<br />
this shortfall can be easily made up by auxiliary natural gas fir<strong>in</strong>g <strong>in</strong> the recovery boiler.
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