Professor Weyrauch has also carefully investigated this part
of the subject and fully confirms, if he, indeed, does not go beyond
Professor Gutermuth. He claims that the efficiency of fuel consumed in
this way is six times greater than when burnt under a boiler to
generate steam. He goes so far as to assert that with a good method of
heating the air, not only can all the losses due to the production and
the transmission of the compressed air be made good, but also that it
will actually contain more useful energy at the motor than was
expended at the central station in compressing it.
According to Professor Riedler, from 15 to 20 per cent. above the
power at the central station can be obtained by means at the disposal
of the power users, and it has been shown by experiment that by
heating the air to 250 deg. Cent. an increased efficiency of 30 per
cent. can be obtained. Better results than those heretofore obtained
may, therefore, be confidently expected with a more perfect and
economical application of the fuel in heating the air, and a better
means of regulation in admitting it to the motors. In his report
Professor Riedler indicates a method by the use of which he considers
considerable advantages may be secured. This is the heating the air in
two stages instead of at one operation, and passing it through two
motors, to the first of which the air is admitted heated only to a
moderate extent; the exhaust from this motor then passes into a second
heater and thence into the second motor.
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