image (4.136)

where U may depend on wind speed in analogy to (4.118). The collector gain is now given by Ecgain=Ecsw+Eclw+Ecsens,image where the first term is proportional to A, while the two last terms are proportional to Aa. Assuming now a fluid flow Jmcimage through the absorber, the expression for determination of the amount of energy extracted becomes [cf. (4.128)]

JmcCpc(Tc,outTc,in)=Ecgain(T¯c)AaCdT¯c/dt=Ecsw+Eclw(T¯c)+Ecsens(T¯c)AaCdT¯c/dt), (4.137) ...

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