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مکانیک::
بازده کلکتور
For collecting energy from sun, different methods like evacuated (vacuum) tube collectors are used which prevents the convection loss from the receiver improving the collector efficiency.
Where F ′ is called as collector efficiency factor and Tf is the local fluid temperature.
FR is a function of collector efficiency, specific heat of fluid, flow rate, dimension of collector, heat loss coefficient UL etc.
Pu = FR [GbηoAa − UL (Tfi − Tamb) Ar] (2.8) Dividing the above equation by Pin, steady state collector efficiency can be obtained as,
From equation (2.9), it is observed that the collector efficiency ηc depends mainly on two factors Pr and PL.
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