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

7. DISCUSSION
extract as much of the waste heat as it can, there will only be enough
waste heat left to make 3kW of hot water per 100kW fuel input (see figure
5.32 page 153). This means that almost all of the waste heat can be used
in the ABS unit. So if domestic hot water heating is to be made from the
SOFC exhaust gas then the cooling production will decrease a lot, and for
each kW the hot water production is decreased, approximately 1,5kW of
cooling can be made (since COP ABS = 1,48).
Hotel locations
One of the really good places to use the SOFC-ABS would be at the
Seychelles. First of all the primary industry for this group of islands is
tourism so there are a lot of hotels. Secondly their primary energy source
is oil which the government wants to replace which is an advantage for
the SOFC. Thirdly the climate is perfect for using the ABS air conditioning:
the average temperature is between 24 and 30 degrees all year, creating
a certain need for air conditioning all year round. And since the
average temperature rarely exceeds 33 ◦ C, the absorption unit is capable
of running just about all the time with a desorber temperature of no more
than 150 ◦ C which is the maximum ambient temperature that can be used
with this desorber temperature is only 33 ◦ C since the relative humidity is
around 80%.
Bangkok could at first glance also be a potential place for the SOFC-ABS.
The temperature is a couple of degrees higher than for the Seychelles during
summer (increasing the air conditioning need). But since the maximum
temperature is higher, and the climate is very humid (up to 90%
relative humidity), the desorber temperature will have to be increased
up to 190 ◦ C for the system to even run at this ambient temperature. So
fairly expensive materials are likely to be needed in order to minimize
the corrosion rate of the Desorber (and probably also SHEX), meaning
that Bangkok after all might not be the best place to use the absorption
cooling unit after all.
Las Vegas has even higher maximum temperatures (up to 46 ◦ C), but since
the air humidity is much lower than in Bangkok, the system will run at
temperature up to 48 ◦ C at a desorber temperature of 150 ◦ C. So this makes
for a much better place to put the SOFC-ABS unit - especially since there
are a lot of hotels and casinos which needs air condition and electricity.
Although in this climate, the water consumption could be a problem.
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