Question: Q 3 . ( 5 marks total ) Thermal Properties Selective surfaces are surfaces for solar thermal absorbers that reduce reradiation losses and, hence, increase

3 . (5

marks total

)

Thermal Properties Selective surfaces are surfaces for solar thermal absorbers that reduce reradiation losses and, hence, increase thermal efficiency of collectors. The surfaces are built from many units with weight of around

3

kg and has the specific heat of

750 \frac{J}{k g * K} .

Calculate the number of these units needed to absorb

{1.1}^{* *} 10^{4} k W h

of heat by a temperature increase of

5 C .

Q 3 . ( 5 marks total ) Thermal Properties

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