The scroll expander has gained big attention recently as it
has a higher ability of energy conversion than traditional
pneumatic drives, such as pneumatic cylinders and vanetype
air motors [3, 4]. It has been successfully applied to
build hybrid compressed air Uninterrupted Power Supply
(UPS) and Micro Combined Heat & Power (Micro CHP)
systems, in which scroll expanders are used to drive
electrical generators for electricity generation [5]. In
addition, the researchers have investigated the possibility
and the feasibility of using the scroll expander for
recovering the exhaust energy via the different systems,
such as a combination of a scroll expander and a
compressor for recycling work in a fuel cell system [6], the
exhaust compressed air energy recycling from traditional
pneumatic actuating systems and the post-combustion gas
energy reuse from vehicles