integration of solid oxide fuel cells and ... - Ea Energianalyse

6. CASES AND ECONOMICS
climate. So the annually water consumption for the cooling tower is up
to about 1900 m3 if the system is running at full load 24/7.
year
The price and the availability of water depends very much on local
conditions. It is out of the scope of this report to investigate the exact
circumstances. Instead a rough estimate of the expenses of water has
been made and compared to the monetary value of the electrical power
produced by the SOFC in order to assess the proportions of the water
consumption. The calculations are found in appendix D.3 (page 273).
The price of water is assumed to be 10 DKK 6 and electricity is assumed
m 3
to be 2 DKK 7 kWh
. For the humid climate (φ = 0,9) the expense of water is about
1% of the value of electricity produced 8 . For the dry climate (φ = 0,4) the
expense is about 2%. If the water price doubled and the electricity price
was reduced by 50%, the expense of water would be about 4% and 8% of
the value of electricity produced for the wet and dry climate respectively.
So these rough calculations show that the water consumption might
play an important role if the SOFC-ABS system was to be implemented
in an area where fresh water is in short supply. Thus it is important to
address this issue when new markets are considered.
6 The price is inspired by fresh water price for households in Denmark without taxes,
and does not include water treatment.
7 Based on Danish prices including all taxes.
8 Generally it is assumed that the electric efficiency of the SOFC is 0,5 and that the
system is operated at full load all year.
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