226 The Impact of Renewable Energy Sources
the scheme presented in [27] where renewable energy sources are not adopted.
Comparing these two schemes it is observed that for a broad range of demands
the scheme with the solar powered IT servers consumes significantly lower non-
green energy per operating period. Furthermore, the average non-renewable
energy consumption for the architecture with solar powered IT servers in-
creases almost linearly with the number of demands for up 40wv/source, in
contrast to the non-renewable design where a stepwise increase of the power
consumption is observed above 20wv/source.
For traffic demands above 20wv/source, the multi-period VI design scheme
with renewable energy sources consumes significantly lower non-green energy ...