## 822

3. Work Done

(a) Expansion space

Pmnx V'

(c) Net cycle work

4. Heat Transferred

Adequate expressions were not derived for the heal transfer and the enthalpy and entropy changes expressed in terms of the principal design parameters, in the simple Schmidt cycle the equality [dQ = ftp d V)T] holds because the fluid is considered a perfect gas and the processes of compression and expansion arc assumed isothermal. With a compound working fluid the equality does not hold, for the fluid is not a perfect gas in the compression space. The heat transferred may perhaps best be estimated by consideration of the enthalpy or entropy changes for the unsteady flow two-fluid systems represented by the expansion and compression spaces, considered separately. This has not yet been done. It is suggested here that the various assumptions (particularly those of isothermal compression and expansion) would lead ultimately to a cycle efficiency equivalent to the Carnot value as is the case with the Ideal Stirling and Schmidt cycle. In that case tj = = (1 — T) (8.27)

5. Mass Distribution (a) Expansion Space and the mass velocity d(rnjm*) , t , K [ 1 - 5] \f) sin(</> 0)-8 sin 0 - sin </>

d <f> K 2L1 + kJ'I (1 + 5 cos(</> - f)))?

where the characteristic mass

Pmax VV

(b) Compression Space

## Solar Stirling Engine Basics Explained

The solar Stirling engine is progressively becoming a viable alternative to solar panels for its higher efficiency. Stirling engines might be the best way to harvest the power provided by the sun. This is an easy-to-understand explanation of how Stirling engines work, the different types, and why they are more efficient than steam engines.

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