Ilk n m [If ticos

K r L - «SI | g(sin((/> - 01 -sin(0 - «)) -sin(<f> - a)l 2 [ 1 -F k J" [ (1+Scos (<b-0)f J

180 working fluids in stirling engines

(c) Dead Space

Since

* ~~ (1 + k) Vl + iC/ (H-6 cos{<f>- 0)) (8-32)

mn 2m m

the mass velocity d(m„/m*) _ / I + g\/ KX \ / (1 - 5)( - 5 sin(</> - 0))\

d«i> "\1 + kAi4K/\ (l + ScOsi^-fl))2 / Nomenclature

The nomenclature for the above is precisely that used for the Schmidt cycle analysis in Chapter 4 with the addition or substitution of:

A defined by (K7+ k' + 2kK cos a B defined by K + k + 2S

M molecular weight m* = characteristic mass defined above (eqn 8.29). mc =mass of working fluid in the compression space mD mass of working lluid in the dead space me = mass of working fluid in the expansion space ma = mass of air in the working space m, = mass of vapour in the working space mw — total mass of working fluid (mB+mv) N = ratio of characteristic gas constants M„/Mv P ~ engine output

Pc = engine output in the compression space PE = engine output in the expansion space p - instantaneous cycle pressure plti. = instantaneous partial pressure of the air component in the compression space pllt - instantaneous partial pressure of the air component in the expansion space pvc - instantaneous partial pressure of the vapour component in the compression space pvc = instantaneous partial pressure of the vapour component in the expansion space

Rv - characteristic gas constant of vapour Tc = absolute temperature of the compression space 7'n = absolute temperature of the expansion space r = time

Vc = swept volume of compression space V ~ instantaneous volume of the compression space Vc: = dead volume

V,u = volume of dead space at temperature 7C

VDn = volume of dead space at temperature TR

VG — swept volume of ihe expansion space

Vc = instantaneous volume of the expansion space

VT -combined swept volume of the working space V', - Vc

X =dead volume ratio VD/VF

a = angle by which volume variations in the expansion space lead those in the compression space (3 = component mass ratio mjma

Solar Stirling Engine Basics Explained

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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