
587Energy Storage
© 2008 Taylor & Francis Group, LLC
the volume of the reservoir may be sufcient to operate the turbine for 1 h at full load,
whilethe compressor could be designed to recharge the reservoir in 4 h. In this arrange-
ment, thecompressor could be sized for one quarter of the air passing through the turbine,
and a charging ratio of 1–4 would be obtained. The design of a CAES system offers consid-
erable exibility in size and location. Moreover, on a specic cost per rated power capacity,
the main part of the equipment costs only a fraction of that for an equivalent gas turbine,
since the electrical output of CAES can be several t ...