## By

M,i = I xVE,Wan( 1 S2)^]/i?T|,[ 1 F a cos(</, - *)]. (4.22)

I he rate of change of mass of working fluid in the dead space is dM(,/d</> - [XVEpme,B(l - d2)'- 5 sin(<f> - 0)]/KTD[ I l 8 cos(¿ - 0)

Now dMc f d.Víc k d A'/j = 0, so that the total mass of working fluid Mr is constant. Now.

Mt= VRpmc.B(l -82Wt( I Feos </>)+1<| l+cos(cfr - «)]

Af,= V,,P„ICn„(l-«2)'[T + S F(k/2)(1 +cos a)]/R7'c(l I 5 cos 0).

Heat lifted and engine output in dimensionless units

(a) The heat lifted per unit mass of working fluid, combining eqns (4.17) and (4.23) is given by

On»« ^ QIMrRTc = tt6 sin 0( I + 8 cos 0)/{( I 82)¡\ 1 + (I - 82)*]

Similarly, the net engine-output per unit mass of working fluid is given by

(b) Non-dimensional expressions, in terms of characteristic pressures and volumes, may be devised as follows. The combined swept volume is given bv

Combining this with eqns (4.13) and (4.17), then

OmnK = 0/(pinax V-r) -[tt(1 - 5)* 5 sin 0]f[( 1 + k)( 1 + 1 + (1 - 52)i)] ## Solar Stirling Engine Basics Explained

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