## Yl

The thermal ediciency for T, ^ /is given by:

(y - I )[t(1 + IniarJo)} - (« 4- <r -1n rj4- IJ

_ (y ~ \)W+\niarJt>)}-{a + <T + \nrey I IJ X] ~ y(I -i)(r-l) + r(y-l)ln(are/p)

Tlie cfTcctivc work output per cyclc may be represented by the indicated mean effective pressure, defined by : p„, = W/strokc volume

or in dimensionless form with respect to the pressure at state 1 as £ = ftJPi rjr{I 4In(arjp)\ -{a l-g-f In Q4 1] (<rrc- I)

Now consider some special cases: (a) Ideal Stirling cycle Here hence and and since

(y l)|r{H- In r)-(r+ 1 fin r)4l] (t— 1) —c(t — 1)4t(y — l)lri r

(Y-D(T-I)hir (i -c)(t- 1)4 t(7 * l)ln r and for e = I, tj = I -(1/rJ the Carnot ellicicncy. Also:

(1)) Ideal Ericsson Cycle 1 Icrc hence and and since

(y — l)[r{l-f In r}-( I -4 r-Hn r)+ 1] y(l -c)(r- t) + -r(y- l)ln r

__(y- IKr- I )ln r y(I — c)(r— 1)4-r(y - l)ln r and for f 1, t| = 1 — (1/r) the Carnot efficiency. Also r[r{l + lnr} (l + r-l-ln r)+ 11

(c) /r/cii/ constant-volume heating, constant-pressure cooling, cycle Here

## 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.

Get My Free Ebook