integration of solid oxide fuel cells and ... - Ea Energianalyse
integration of solid oxide fuel cells and ... - Ea Energianalyse
integration of solid oxide fuel cells and ... - Ea Energianalyse
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2. MARKET INVESTIGATION<br />
2.4.3 Results<br />
The full results <strong>and</strong> input can be seen in appendix A.4 page 202. First<br />
<strong>of</strong> all it turns out, that the waste heat from the SOFC is not at all<br />
enough to cover the entire cooling dem<strong>and</strong> even though a double stage<br />
absorption chiller is used (with a COP <strong>of</strong> 1,3). In the normal climate<br />
the ABS chiller supplies ¼ <strong>of</strong> the yearly cooling dem<strong>and</strong> <strong>and</strong> in the<br />
hot climate, it supplies 1/3 because the SOFC system must be larger in<br />
order to generate additional electricity for the supplementary electrical<br />
air conditioner. This does, however, mean that the small ABS chiller can<br />
run as base load, <strong>and</strong> hence have a lot <strong>of</strong> full load hours per year since<br />
the daily variation <strong>of</strong> cooling dem<strong>and</strong> is probably not so big that it falls<br />
below 1/3 <strong>of</strong> the average daily cooling dem<strong>and</strong>. But <strong>of</strong> course both ECH<br />
<strong>and</strong> ABS will have to be shut <strong>of</strong>f during wintertime in the normal climate.<br />
If the lifetime <strong>of</strong> all the components in the system is 10 years, the total<br />
cost (Net Present Value) for system components, natural gas or electricity<br />
imported from the net is calculated to be the following:<br />
Hot Climate<br />
Case A: 27mil. DKK (-SOFC, -Absorption unit)<br />
Case B: 15mil. DKK (+SOFC, -Absorption unit)<br />
Case C: 14mil. DKK (+SOFC, +Absorption unit)<br />
With an estimated SOFC price <strong>of</strong> around 2500DKK/kW, the investment<br />
cost <strong>of</strong> the SOFC will be just above 1mil. DKK. And hereby a yearly electricity<br />
consumption <strong>of</strong> 3,0mil. DKK can be exchanged with a gas consumption<br />
<strong>of</strong> 1,4mil. DKK. So if the lifetime is 10 years, 13mil. DKK can<br />
be saved in <strong>fuel</strong> (with a discount rate <strong>of</strong> 5%), <strong>and</strong> the total surplus will<br />
then become 12mil. DKK.<br />
If an ABS unit is used, the additional investment (compared to a purely<br />
electrical air conditioner) will be 0,4 mil. DKK 13 , <strong>and</strong> the savings in<br />
<strong>fuel</strong>/electricity will be around 1,9 mil. DKK. So adding an absorption<br />
13 If no ABS unit is used, the electrical chiller will cost 1,5mil. DKK. If the ABS is<br />
used, the unit in itself will costs around 1,0mil. DKK <strong>and</strong> the supplementary electrical<br />
air conditioner will cost 0,9mil. DKK.<br />
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