• The solar radiation field:

In the estimation of the solar radiation we used the models reported in the "Atlas solaire d’Algerie” [2]. The global solar radiation is the sum of a direct and a diffuse radiation. A critical report on the capderou work showed that if the direct radiation is underestimated the diffuse radiation for a mean day is quite surestimated compared to measured values. All the equations used to estimate the direct and diffuse radiations for any site and given day can be found in reference [1].

dT

f (i)

dt

dT

p(i)

dt

— a(p(i) Tf (i)) )(f (i) Tf (i-1)) — C(Tf (i) — Tp(i) )- dTp(i) — Ta )+ e’It

HeAs V with a — e -, b — —

p(i)

(1) (2)

C

f

Ax P LAcs ЬХ

,C-

HeAs, d — ^L^

C

C

and e —

FAc (та)

C

The energy balance over the flat solar collector leads to the following system of equations solved by the 4th order Runge-Kutta method.

(Tf and Tp are the fluid and the collector absorber temperatures respectively)

• The ejector flow loop:

• entrainment ratio ra :

(3)

ra—

m

m

The entrainment ratio is equal to the ratio of the secondary and the driving mass flowrates.

(4)

with m’ : driving mass flow rate and m’’ : secondary mass flow rate The optimal ratio for any working fluid is given by the following equation [2] :

		( pe Л			( pc Л
ra —	3.7 •	PC	— 0.507		l PB )

0.85

SHAPE * MERGEFORMAT

The refrigerant flow loop: Coefficients of performance : COP = —

OQJd*eaal_________

Qbo> + Wp T

T — T C__ XTB TC

T — T TH TC

B

(5) (5) (7)

Фcool — m"(h6 — hs)

Qe