The pond depth recommendations vary in
the literature, but an advantageous depth is perhaps on the order
of 15–30 cm
The above specific production rate for algal biomass would have
to be adjusted based at least on geographical location. The location
impacts the production rate both through temperature and the
available amount of useful (for algae growth) energy from the
sun per day. The impact of location on insolation has been evaluated
quantitatively and in detail (Walker, 2009, and references cited
therein). Energy balances on bodies of water exposed to the
environment and radiation from the sun are available (Keijman,
1974). The temperature swings of the surrounding air are greatly
dampened even in shallow ponds of about 0.6 m depth, for example
from a range of 24–40 C air temperature (night/day) vs. 27–
34 C pond water temperature (Chiasson et al., 2000). The overwhelming
factor for cooling to counteract heating from the surrounding
air and solar radiation is evaporation of water which
will have to be replaced for algae ponds. Evaporative losses
through heating of open ponds pose a problem for cold climates.
Losses can be several gallons of water per gallon of fuel produced.
Here, a first-level sustainability evaluation based on carbon is
shown. Mass balances for water can be performed but would only
be needed if the carbon balance is sustainable.
The dynamic economical modeling of algae diesel production
that will be reported in the future will accommodate the impact
of geographical location in what-if scenarios. Here we assume an
optimistic overall average biomass growth rate for an advantageous
moderate climate with advantageous insolation.
The pond depth recommendations vary in
the literature, but an advantageous depth is perhaps on the order
of 15–30 cm
The above specific production rate for algal biomass would have
to be adjusted based at least on geographical location. The location
impacts the production rate both through temperature and the
available amount of useful (for algae growth) energy from the
sun per day. The impact of location on insolation has been evaluated
quantitatively and in detail (Walker, 2009, and references cited
therein). Energy balances on bodies of water exposed to the
environment and radiation from the sun are available (Keijman,
1974). The temperature swings of the surrounding air are greatly
dampened even in shallow ponds of about 0.6 m depth, for example
from a range of 24–40 C air temperature (night/day) vs. 27–
34 C pond water temperature (Chiasson et al., 2000). The overwhelming
factor for cooling to counteract heating from the surrounding
air and solar radiation is evaporation of water which
will have to be replaced for algae ponds. Evaporative losses
through heating of open ponds pose a problem for cold climates.
Losses can be several gallons of water per gallon of fuel produced.
Here, a first-level sustainability evaluation based on carbon is
shown. Mass balances for water can be performed but would only
be needed if the carbon balance is sustainable.
The dynamic economical modeling of algae diesel production
that will be reported in the future will accommodate the impact
of geographical location in what-if scenarios. Here we assume an
optimistic overall average biomass growth rate for an advantageous
moderate climate with advantageous insolation.
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